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Transition Metal Chemistry

Current research reports and chronological list of recent articles..




Transition Metal Chemistry is an international scientific journal dealing with all aspects of the preparation of transition metal-based compounds of all kinds, their structural, physical, kinetic and biological properties, their use in chemical synthesis as well as their application in the widest context, their role in naturally occurring systems and more.

The publisher is Springer. The copyright and publishing rights of specialized products listed below are in this publishing house. This is also responsible for the content shown.

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Additional research articles see Current Chemistry Research Articles:

 - Organometallics.



Transition Metal Chemistry - Abstracts



An investigation into luminescent phenoxo-bridged heterobimetallic copper(II)–calcium(II)/strontium(II)-based bis(salamo)-like complexes

Abstract

Two luminescent hetero-trinuclear complexes [Cu2Ca(L)(µ2-NO3)2] (1) and [{Cu2Sr(L)(µ2-NO3)(ƞ2-NO3)}2]·2EtOH·H2O (2) have been prepared by a flexible bis(salamo)-based ligand (H4L) with Cu(NO3)·3H2O and M(OAc)2·nH2O (M(II) = Sr, n = 2; Ca, n = 1), respectively. The structural characterizations were performed by physicochemical and spectroscopic methods. Two penta-coordinate Cu(II) atoms of complex 1 are sited at the N2O2-donor coordination environments of the (L)4− moiety, while tetra- and penta-coordinate Cu(II) atoms in complex 2 are also located in the N2O2 cavities of the (L)4− unit. Ca(II) and Sr(II) atoms are located in various O8 and O9 cavities, respectively. In the solid state, infinite 3D supra-molecular structures are formed in complexes 1 and 2 through the abundant intermolecular hydrogen bonds and π···π interactions. These interactions were quantitatively analyzed by Hirshfeld surface analyses. DFT calculations and fluorescence properties showed that complexes 1 and 2 have stable chemical properties and good luminescence properties.

Graphical abstract

Two hetero-trinuclear complexes [Cu2Ca(L)(µ2-NO3)2] (1) and [{Cu2Sr(L)(µ2-NO3)(ƞ2-NO3)}2]·2EtOH·H2O (2) have been synthesized and characterized structurally. Two penta-coordinate Cu(II) atoms in complex 1 are located in the N2O2 cavities of the (L)4− unit, while tetra- and penta-coordinate Cu(II) atoms in complex 2 are also located in the N2O2 cavities of the (L)4− unit. There are eight and nine oxygen donor atoms coordinating to the Ca(II) and Sr(II) atoms. Infinite 3D supra-molecular structures are formed in complexes 1 and 2 through the intermolecular hydrogen bonds and π···π stacking interactions.


Datum: 27.01.2022


Mononuclear copper(II) complexes of the macrolide antibiotics tylosin and tilmicosin

Abstract

The 16-membered macrolide antibiotics tylosin (HTyl) and tilmicosin (HTilm) react with Cu(II) to form isostructural mononuclear complexes of composition [CuL2] (L = Tyl (1), Tilm (2)). Reactions take place in aqueous alkaline solutions, at molar metal-to-ligand ratio ranging from 1:10 to 1:2. The coordination species obtained were characterized by physico-chemical and spectroscopic methods. Experimental data and quantum chemical calculations revealed that the copper atom is placed in a square-planar environment and the main chromophore unit is of composition [CuN2O2]. The complexes consist of two ligand monoanions acting in a bidentate coordination mode via the tertiary nitrogen atom and the deprotonated hydroxyl group of the mycaminosyl substituent. The antibacterial assay of the macrolides and their mononuclear copper(II) complexes 12 against Gram-positive microorganisms demonstrated that the new coordination compound of tilmicosin exhibits enhanced activity compared to that of the parent ligand.


Datum: 20.01.2022


Synthesis, crystal structure, and photocatalytic property of heterometallic calcium‒titanium oxo cluster with high aqueous stability

Abstract

A new heterometallic calcium‒titanium oxo cluster formulated as [Ca2Ti8(μ3-O)8(AcO)2(OiPr)2(BA)16]·4H2O (BA = benzoate) was synthesized and structurally characterized by single-crystal X-ray diffraction analysis. The cluster core contains a crown-ether-like Ti8O8 ring with two Ca atoms embedded in it. Due to the unique {Ti8Ca2O8} core structure and the coordination with sixteen bridging benzoate ligands, this cluster exhibits high structural stability in aqueous solutions with a wide pH range. Photocatalytic experiments for the degradation of methyl orange demonstrate the high photocatalytic activity and good recycling stability of the cluster.

Graphical abstract


Datum: 19.01.2022


Manganese(II)-based coordination polymer as a bi-responsive luminescent sensor for highly selective detection of picric acid and CrO42− ion

Abstract

A novel luminescent coordination polymer (CP) {Mn(H2abtc)(DMF)(H2O)2·2H2O}n (1), (H4abtc = 3,3′,5,5′-azobenzenete-tracarboxylic acid), has been successfully prepared by the solvothermal reaction of H4abtc and MnCl2·4H2O, which has been further characterized by single-crystal X-ray diffraction, elemental analysis, thermogravimetric analysis (TGA), infrared (IR) spectrum and powder X-ray diffraction (PXRD). 1 can serve as a potential dual response luminescence sensor for picric acid (PA) and CrO42− via luminescence quenching with good selectivity and sensitivity. The quenching behavior of PA toward 1 can be ascribed to the combined effects of electron and resonance energy transfer mechanisms. And the quenching phenomenon of CrO42− to 1 can be explained by the electron transfer mechanism.

Graphical abstract

A novel luminescent Mn(II)-based coordination polymer 1 has been successfully prepared. 1 can serve as a potential dual response luminescence sensor for Picric acid (PA) and CrO42− with good selectivity and sensitivity.


Datum: 18.01.2022


6-Membered cyclopalladated complex of 1-N-ferrocenylmethylindazole and its catalytic activity in cross-coupling Suzuki reactions

Abstract

The new organometallic derivatives 1-N- and 2-N-ferrocenylmethylindazoles (1 and 2) were synthesized as ligand precursors. Direct cyclopalladation of 1 using different palladating agents (Li2PdCl4, Na2PdCl4, Pd(OAc)2/LiCl) followed by the addition of PPh3 led to the 6-membered palladacycle 3. The structures of new ferrocene ligand precursors 1 and 2 and CN cyclopalladated complex 3 were characterized by physicochemical and spectroscopic methods. The single-crystal X-ray analysis of 3 indicated a boat conformation of the 6-membered palladacycle. The obtained bimetallic complex 3 appeared to be an active precatalyst in the Suzuki reactions of aryl bromides with phenylboronic acid.


Datum: 16.01.2022


Diarylazooxime complex of cobalt(III): synthesis, structure, ligand redox, DFT calculations and spectral characteristics

Abstract

By using a multifunctional diarylazooxime ligand LNOH 1, incorporating electron deficient azo chromophore in conjunction with a pendant π-electron-rich naphthyl group, the trans dichloro bis complex of type [CoIII(LNOH)(LNO−)Cl2] 2 has been synthesized. The structure of the chelate has been determined by X-ray crystallography, thereby authenticating the presence of oxime-oximato hydrogen bond within the coordinated moiety. The stability of this complex is attributed to intra-molecular hydrogen bonding as well as due to strong Phπ–Phπ stacking interactions. The complex has been characterized by several spectroscopic techniques, and their electrochemical properties have been reported. These are further complemented by theoretical studies in the form of DFT and TDDFT. The visible excitation for the complex arises from mainly mixed singlet manifold 1ILCT and 1LLCT transitions.

Graphical abstract


Datum: 12.01.2022


Nickel(II) and cobalt(II) complexes with 4,5-dichloro-isothiazole-3-carboxylic acid and 1,10-phenanthroline: synthesis, crystal structures and cytotoxicity

Abstract

In this study, Ni(II) and Co(II) complexes [Co(H2O)2L2] (1), [Ni(H2O)2L2] (2), [Co(phen)L2] (3), [Ni(phen)L2]·2H2O·EtOH (4·2H2O), and [Ni(phen)2(H2O)L]·L·2H2O (5), where L—4,5-dichloro-isothiazole-3-carboxylate anion and phen—1,10-phenanthroline are reported. All complexes have been characterized by physicochemical and spectroscopic methods. Mass spectrometry and UV–Vis spectroscopy have been used to show the behavior of complexes in ethanol solution and phosphate buffer saline. Crystal structures of mononuclear complexes 1, 4 and 5 have been determined by single-crystal X-ray diffraction. In the structure of 4, mononuclear units have been found to form infinite zigzag chains due to the presence of Cl•••Cl non-covalent interactions which can be regarded as halogen bonding. All complexes have been screened in vitro for their cytotoxic activity against Hep2 cancer cell line. The complexes obtained showed no activity (IC50 > 50 µM) in comparison with structurally related Cu(II) complex [Cu(phen)(H2O)L2] exhibiting dose-dependent toxicity comparable to that of cisplatin (IC50 = 3.06 ± 0.07 µM (Cu(II) complex), IC50 = 9.2 ± 0.5 µM (cisplatin)). DNA binding constants were determined using absorption titration: Cu(II), Ni(II) and Co(II) complexes possessed similar DNA binding efficacy (Kb ~ 104).


Datum: 12.01.2022


Dirhenium(III,III) trithiocarbamato complexes: experimental and theoretical investigation

Abstract

The green colored trithiocarbamato complexes of dirhenium(III,III) of type [Re2(μ-η2-SLR)22-LR)3][ReO4] (4(LR)), where LR represents the dithiocarbamato ligands [LR = S2CNEt2, 4(LEt) and S2CN(CH2)4, 4(LPyr)], have been synthesized in moderate yield by reacting Re2(μ-O2CCH3)4Cl2 (1) and sodium salt of diethyldithiocarbamate or pyrrolidinedithiocarbamate in boiling ethanol under nitrogen atmosphere. The spectral (IR, UV–vis, NMR) and electrochemical properties of the complexes are reported. The identity of complex 4(LEt) has been established by single-crystal X-ray structure determination. The density functional theory (DFT) calculations rationalized the electronic structure of complexes 4(LR) in comparison with dithiocarbamato complexes of dirhenium(II,II) and dirhenium(III,II). The absorption spectra of the 4(LR) complexes are scrutinized by the time-dependent DFT analysis.


Datum: 01.12.2021


Inorganic–organic hybrids assembled by flexible multidentate linker: design, structure and luminescence

Abstract

Three coordination complexes, [Cu(L1)(2,2–bipy)]2n·3nH2O (1), [Cu(L1)(2,2–bipy)2xH2O (2: x = 3.5 and 3: x = 5), were synthesized by reactions of the flexible ligand 1,1´-methylenebis(5-methyl-pyrazole-4-carboxylic acid) (H2L1) and coligands 2,2'–bipyridyl (2,2-bipy) with Cu(OAc)2·H2O in different reaction condition, respectively. The structures of these complexes were established by elemental analysis, IR and single-crystal X-ray diffraction analysis. Complex 1 possessed a one-dimensional (1D) chainlike structure, (L1)2− group exhibited trans-configuration and coordinated to Cu(II) ions by carboxylate O atoms in µ2k:O,O′; k:O′′′,O′′′ mode. In the similar subjectival structure of 2 and 3, (L1)2− anions also presented trans-configuration, but only one carboxylate group chelated to a Cu(II) ion, and the other carboxylate group remains free in a deprotonated form. The 1D chains in 1 were further assembled to a 3D supramolecular architecture via intermolecular C–H···O hydrogen bond. The mononuclear zwitterionic complexes 2 and 3 are further assembled into a 2D/3D supramolecular architecture by intermolecular hydrogen bonds and π···π interaction. The thermal and photoluminescent properties of 13 in the solid state have also been investigated.


Datum: 01.12.2021


ADT-Type [FeFe]-hydrogenase biomimics featuring monodentate phosphines: formation, structures, and electrocatalysis

Abstract

To further develop the diiron subsite biomimics of [FeFe]-hydrogenases, two new diiron azadithiolate (adt) complexes Fe2(μ-adtNPh)(CO)5(Ph2PX) (X = NHBut, 1 and P(O)Ph2, 2) featuring monodentate phosphines were unexpectedly produced by the Me3NO-induced decarbonylating reactions of all-CO diiron precursor Fe2(μ-adtNPh)(CO)6 (A, adtNPh = (SCH2)2NPh) with different aminodiphosphines (Ph2P)2NR (R = But and C6H4Cl-p) in MeCN at ambient temperature. The as-obtained complexes 1 and 2 have been fully characterized by means of elemental analysis, FT-IR, (1H, 31P) NMR spectroscopies and further confirmed by X-ray crystallography. At the same time, the electrochemical and electrocatalytic behaviors of 1 and 2 have been studied and compared in the absence or presence of acetic acid (HOAc) as a proton source by cyclic voltammetry (CV), suggesting that they can be considered as the active biomimetic electrocatalysts for proton reduction to hydrogen (H2).


Datum: 01.12.2021


Two nickel(II) carboxyphosphonates with different supramolecular structures: synthesis, crystal structures and magnetic properties

Abstract

Two Ni(II) carboxyphosphonates, namely [Ni(H4L)2] (1) and [Ni(H3L)(H2O)]·2H2O (2) (H5L=HOOCC6H4CH2N(CH2PO3H2)2), have been hydrothermally synthesized. Structural analyses reveal that 1 shows a two-dimensional (2D) inorganic layer structure, and the layers are further packed into a three-dimensional (3D) supramolecular structure through the interlayer hydrogen-bonding interactions. In 2, two adjacent {NiO5N} polyhedra are connected to form a {Ni2O8N2} dimer, and these dimers are further linked by {CPO3} tetrahedra to form a one-dimensional (1D) chain. Consecutive chains are further connected by the intermolecular hydrogen-bonding interactions, resulting in a 2D supramolecular layer structure. Magnetic analyses exhibited that 1 shows major antiferromagnetic behavior, whereas 2 displays ferromagnetic interactions at low temperatures. Meanwhile, the magnetic properties of 1 and 2 have also been quantified using the Curie–Weiss law and the PHI program package, respectively.

Graphic abstract

Two nickel(II) carboxyphosphonates with different structures showed different magnetic behaviors. Meanwhile, the magnetic properties of 1 and 2 have also been quantified using the Curie–Weiss law and the PHI program package.


Datum: 01.12.2021


Metal-directed thiophene-carboxylate-based nickel(II) complexes as multifunctional electrochemical and fluorescent sensors for detecting different analytes

Abstract

To investigate the effect of the sites of S-atoms in thiophene carboxylates on the structures of coordination polymers, two thiophene-mono-carboxylic acids (2-Htpc = thiophene-2-carboxylic acid and 3-Htpc = thiophene-3-carboxylic acid) and a fluorescent active semi-rigid amide [N,N′-bis(3-methyl pyridine-3-yl)-2,6-naphthalenediamide (L)] were selected to combine with electrochemically active metal ions of Ni(II), and two new coordination polymers (CPs), namely [Ni0.5(L)0.5(2-tpc)](H2O)]∙1.5H2O (1) and [Ni0.5(L)0.5(3-tpc)](H2O)]∙1.5H2O (2), were obtained through traditional hydrothermal methods. The single-crystal X-ray diffraction analyses of the two CPs show that there are similar zigzag chains with the crossed-stacking modes. The two CPs can act as multifunctional electrochemical sensors to detect NO2, chloramphenicol, and L-ascorbic acid (AA) and fluorescent recognition of Fe3+ and Cr2O72−. The detection limits of 1 were 1.08 × 10−6, 1.18 × 10−4, and 1.06 × 10−4 for AA, Fe3+, and Cr2O72−. The corresponding values of 2 were 1.43 × 10−6, 2.06 × 10−4, and 2.06 × 10−4.

Graphical abstract

Two Ni(II) coordination polymers showing the same crossed-stacking modes display electrochemical and fluorescent sensing properties for metal ions and anions.


Datum: 01.12.2021


Construction of poly-iodine aromatic carboxylate Mn/Co frameworks and iodine adsorption behavior

Abstract

Two poly-iodine aromatic tricarboxylate complexes: {(Me2NH2)[Mn(TIBTC)(2, 2'-bipy)(H2O)]}n (1) and {(Me2NH2)[Co(TIBTC)(DMA)]}n (2) (DMA = N, N-dimethylacetamide), were designed and synthesized by the hydrothermal synthetic methods (TIBTC = 2, 4, 6-triiodo-1, 3, 5-benzenetricarboxylic acid). Complexes were characterized by microanalysis. The crystal structures of complexes 1 and 2 were determined by X-ray single-crystal diffraction. Complex 1 is a 3D network supramolecular network structure connected by the hydrogen bonds, and complex 2 is a 3D network structure. To explore their functional properties, we first investigated the adsorption capacity of complexes 1 and 2 for iodine capture in cyclohexane solution. The maximum adsorption capacity of complex 2 is 125 mg/g. Meanwhile, the adsorption kinetic curves fitting showed that complexes 1 and 2 all conformed to the pseudo-second-order curves.


Datum: 01.12.2021


Reduction of an asymmetric Pt(IV) prodrug fac-[Pt(dach)Cl3(OC(=O)CH3)] by biological thiol compounds: kinetic and mechanistic characterizations

Abstract

An asymmetric Pt(IV) prodrug fac-[Pt (dach)Cl3(OC(=O)CH3)] (dach = 1,2-diaminocyclohexane) was synthesized, and the reduction of the Pt(IV) prodrug by three biological thiols glutathione (GSH), cysteine (Cys) and homocysteine (Hcy) was investigated by a stopped-flow spectrometer. All the reductions were followed by an overall second-order reaction with first-order in both [Pt(IV)] and [thiol]. The reduction of the Pt(IV) prodrug occurred through a chloride bridge (Pt-Cl-S) mediated two electron transfer process. Therefore, the coordinated chloride possesses a better bridging effect than the oxygen atom from the coordinated –CH3COO of the Pt(IV) prodrug. A reactivity trend of k′Cys > k′GSH > k′Hcy is found, illustrating that the reactivity is followed by the trend of Cys > GSH > Hcy in pH 7.4 buffer.

Graphical abstract

Transition state is formed between the axially coordinated chloride of the platinum(IV) complex and the sulfur atom from the thiol/thiolate group of Cys/Hcy/GSH.


Datum: 01.12.2021


Nickel(II) complexes with mono(imino)pyrrole ligands: preparation, structure, DFT calculation and catalytic behavior

Abstract

In recent years, a variety of novel late transition metal catalysts have been used for polymerization of methyl methacrylate (MMA); in order to study the effects of fine-tuning of catalyst structure on polymerization of MMA, we synthesized a series of mono(imine)pyrrole ligands (L1L5) with different substituents in the same position using microwave reactions. Then, the ligands were directly coordinated with NiCl2·6H2O through liquid-phase reaction method to prepare the Ni(II) complexes (14). All the compounds were characterized by spectroscopic methods, and compounds L1, L3, L5 and 2 were characterized by X-ray crystallography. The results showed that the structures of the three ligands were mono(imine)pyrrole Schiff base structure. Complex 2 contains two molecular ligands’ structure and a Ni(II) atom to form a standard square plane geometry. The total molecular energy and other data for each Ni(II) complex were obtained by Gaussian 09 calculation program. The negative total molecular energy indicated the structures of complexes were relatively stable. Additionally, the bond parameters were in good agreement with X-ray single-crystal diffraction data. With the aid of azodiisobutyronitrile (AIBN), the synthesized Ni(II) complexes were used in the polymerization of MMA. By comparing the Ni(II) catalysts with different structures, we found catalytic activities were in a sequence of 4 > 1 > 2 > 3, which indicated the stronger electron-withdrawing ability of the substituent, the better catalytic activity of catalyst for MMA. We also studied the effects of polymerization temperature and time on catalytic performance, the optimum activity (11.71 × 104 g mol−1·h−1) was obtained at 100℃ and 10 h, and the polymer with relatively narrow molecular weight distribution (PDI = 1.91) and large molecular weight (Mn = 36.10 × 104 g mol−1) was obtained under the same condition.


Datum: 01.12.2021


Synthesis, crystal structures, luminescence and magnetic property of two complexes based on 5-nitroisophthalic acid

Abstract

Based on 5-nitroisophthalic acid (5-H2nip) and bis(4-pyridyl)amine (dpa), the complexes {[Cd6(5-nip)6(dpa)4]·EtOH}n (1) and [Co5(5-nip)2(dpa)2(OH)2(SO4)2(H2O)2]n (2) have been synthesized and characterized by elemental analysis, single-crystal X-ray diffraction, IR spectroscopy, thermal gravimetry analysis, fluorescence and magnetic susceptibility. The carboxylate groups of the 5-nip2− adopt three different bridging modes [bis(chelate-bidentate), bis(bidentate) and bis(monodentate)]. The 5-nip2− anions and dpa play as linkers, which connect Cd(II) or Co(II) ions to form the three-dimensional structures of 1 and 2. Moreover, 1 exhibits intense solid-state luminescence emissions centered at 402 nm at room temperature, which mainly originates from the intraligand ππ* transitions of 5-nip2−. Magnetic susceptibility measurement indicates that 2 shows antiferromagnetic interactions between the Co(II) ions.


Datum: 30.11.2021


Synthesis and ethylene oligomerization behavior of trinuclear nickel complex with phosphorus dendrimer

Abstract

A phosphorus dendrimer with multiple amino groups was synthesized via a two-step reaction with phosphonitrilic chloride trimer and 4-acetamidophenol. The trinuclear nickel complex was subsequently prepared with the phosphorus dendrimer and nickel chloride hexahydrate as starting materials. The structures of the phosphorus dendrimer and the trinuclear nickel complex were characterized by physicochemical and spectroscopic methods. The trinuclear nickel complex based on the phosphorus dendrimer was evaluated as catalyst precursor for ethylene oligomerization using methylaluminoxane (MAO) as an activator. Under the conditions of 0.5 h, 0.9 MPa, 25 °C and Al/Ni molar ratio of 700, the catalytic activity of the trinuclear nickel complex showed a maximum value of 2.31 × 105 g/(mol Ni h), and the oligomerization products were mainly low-carbon olefins (C4 and C6). The ligand structure and the coordination mode showed notable variations in the catalytic activities and the product distribution due to the influence of electronic and steric effects. The catalytic activity of the nickel complex based on the ligand with an aryl backbone was superior to the nickel complex based on the ligand with an alkyl backbone.


Datum: 18.11.2021


Anion-templated assembly of Co(II)-complexes based on the semirigid carboxylic acid ligand: synthesis, structure and magnetic property

Abstract

Template-induced synthesis of coordination polymers (CPs) is of increasing interest. Herein, we report the synthesis of two Co(II)-complexes from 4-[(1-carboxynaphthalen-2-yl)oxy]phthalic acid (H3L) and 1,10-phenanthroline (phen) templates by two anions ( NO3, CH3COO) under solvothermal conditions. The compounds were characterized by single-crystal X-ray diffraction, elemental analysis, infrared spectroscopy, powder X-ray diffraction and thermogravimetry measurement, respectively. Compound 1 possesses an infinite 2D layer structure with a (6, 3)-connected topology. Compound 2 exhibits 2D → 3D supermolecular frameworks by ππ stacking interactions among adjacent layers. Moreover, magnetization data for 2 with the {Co2} units showed the antiferromagnetic coupling in the {Co2} units.

Graphical abstract

Two novel Co(II) coordination polymers have been successfully synthesized by templating two different anions ( NO3, CH3COO) under solvothermal conditions. Due to the templating role of the anions, the compounds showed different topological structure. Compound 1 possess an infinite 2D layer structure with a (6,3)-connected topology. Compound 2 exhibit 2D → 3D supermolecular frameworks by ππ stacking interactions among adjacent layers.


Datum: 01.10.2021


Two nickel(II) complexes exhibiting "fused" 9-MC-3 and 12-MC-4 metallacrowns

Abstract

The reactions of (E)-quinoline-2-carbaldehyde oxime (Hqcah) with Ni(ClO4)2·6H2O and NH4SCN and with Ni(CF3SO3)2 and NaN3 led to two solitary metallacrowns (MCs) ([Ni5(qcah)7(Hqcah)(CH3OH)(SCN)(OH)]·ClO4 (1) and [Ni4(qcah)4(N3)4(Py)4] (2), respectively. Complex 1 is a pentanuclear nickel cluster that exhibits two "fused" 9-MC-3 structural units with both rings possessing Ni2–N–O–Ni1–N–O–Ni5–O–N and Ni3–N–O–Ni4–O–Ni5–O–N connectivities. Complex 2 consists of four [Ni(qcah)(N3)(Py)] units with adjacent nickel atoms linked together through N–O groups to construct a tetranuclear 12-MC-4 metallacrown. The ligands exhibit μ3:η2:η1:η1, μ2:η2:η1 and μ1:η2 coordination modes in 1 and μ2:η2:η1 coordination mode in 2. Magnetic property measurements and the fitting of various temperature magnetic susceptibilities revealed antiferromagnetic coupling between metal centers with the negative coupling parameters in both 1 and 2.


Datum: 01.10.2021


Synthesis, crystal structures, and luminescence sensing properties of two cobalt(II) complexes containing bis(thiabendazole) moieties

Abstract

Two new Co(II) complexes, namely [Co2(L1)(TBIP)·H2O]n (1) and [Co2(L2)(NPTA) H2O]n (2) (L1 = 1,4-bis(thiabendazole-1-ylmethyl)benzene, L2 = 1,2-bis(thiabendazole-1-ylmethyl)benzene, H2TBIP = 5-tert-butylisophthalic acid, and H2NPTA = 2-nitroterephthalic acid), were hydrothermally synthesized and characterized. 1 shows a 1D double chain, while 2 displays a binuclear structure. 1 and 2 extend into a 2D supramolecular network via C−H···O and O−H···O hydrogen bonding interactions, respectively. 1 and 2 exhibit excellent chemical stability in a wide pH range of 3−12. Furthermore, 1 and 2 are promising di-functional sensors for the detection of Fe3+/Cr2O72− (pH = 4) and Ni2+/MnO4 (pH = 9), respectively, with high sensitivity and selectivity and a low limit of detection.


Datum: 01.10.2021


 


Category: Current Chemistry Research

Last update: 28.03.2018.






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