# 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.

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## Transition Metal Chemistry - Abstracts

Transition metal complexes of a hydrazone derived from hydralazine hydrochloride and 3,5-di-tert-butylsalicylaldehyde

### Abstract

Mononuclear Co(III), Ni(II) and Cu(II) coordination compounds of (E)-1-(3,5-di-tert-butyl-2-hydroxybenzylidene)-2-(phthalazin-1-yl)hydrazine (LH) were prepared and characterized by physicochemical and spectroscopic methods. The metal-to-ligand ratio was found to be 1:2 in [Co(L)2]Cl·2H2O (1) and [Ni(L)2]·2H2O (2), while it is 1:1 in [Cu(L)Cl]·2CH3OH (3). The X-ray crystal structures of LH and complex 1 is are reported. LH shows monobasic behavior, coordinating through NNO donor atoms. The complexes were investigated for their antimicrobial properties. Complexes 1 and 3 show excellent antibacterial and antifungal activities, respectively.

Datum: 22.11.2017

On the kinetics and mechanism of the conversion of Cr(CO) 5 (κ 1 - P -dppm) to Cr(CO) 4 (κ 2 - P , P ′-dppm) (dppm = 1,2-diphenylphosphinomethane): an alternative hypothesis

### Abstract

The data from a previously reported kinetic evaluation dealing with the conversion of Cr(CO)51-P-dppm) (1: dppm = 1,2-diphenylphosphinomethane) into the corresponding chelated complex Cr(CO)42-P,P′-dppm) (2), via CO loss, is re-evaluated. The conclusion is that the process is more likely to involve a rate-determining step that is first-order in [Cr(CO)51-P-dppm)], as opposed to the previously reported zero-order model as proposed. This implies CO loss from 1, by presumably either an I d or more likely a Dissociative (D: S N 1-type) mechanism, leads to 2. This hypothesis is compared and contrasted to reported data and comparisons are made to similar processes involving related Group VI metal carbonyl species.

### Graphical Abstract

$$\mathop {{\text{Cr}}\left( {\text{CO}} \right)_{5} (\upkappa^{1} -P-dppm) + \Delta }\limits_{{\mathbf{1}}} \to \mathop {{\text{Cr}}\left( {\text{CO}} \right)_{4} (\upkappa^{2} -P,P^{{\prime }} {\text{-dppm}}) + {\text{CO}}}\limits_{{\mathbf{2}}}$$

Datum: 14.11.2017

One-dimensional cyanide-bridged Cr(III)–Cu(II) complexes: synthesis, crystal structures and magnetic properties

### Abstract

Using two trans-dicyanidechromium(III) precursors K[Cr(bpdmb)(CN)2] (bpdmb2− = 1,2-bis(pyridine-2-carboxamido)-4,5-dimethyl-benzenate), K[Cr(bpClb)-(CN)2] (bpClb2− = 1,2-bis(pyridine-2-carboxamido)-4-chloro-benzenate) and one Cu(II) complex of a 14-membered macrocycle as ancillary organic ligand as assembling segments, two one-dimensional cyanide-bridged CrIII–CuII complexes {{[Cu(cyclam)][Cr(bpdmb)(CN)2]}ClO4} n ·nCH3OH·nH2O (1) and {{[Cu(cyclam)][Cr(bpClb)(CN)2]}ClO4} n ·nCH3OH (2) (cyclam = 1,4,8,11-tetraazacyclotetradecane) have been synthesized and characterized by elemental analysis, IR spectroscopy and X-ray structure determination. Single X-ray diffraction analysis shows that their similar one-dimensional cationic single-chain structures consist of alternating units of [Cu(cyclam)]2+ and [Cr(bpdmb)(CN)2]/[Cr(bpClb)(CN)2] with free ClO4 as balancing anions. Investigations of the temperature dependences of magnetic susceptibility and the field-dependent magnetization reveal that both complexes have overall ferromagnetic coupling between the neighboring Cr(III) and Cu(II) centers through the bridging cyanide groups.

Datum: 13.11.2017

N -Propylphthalimide-substituted bis-(NHC)PdX 2 complexes: synthesis, characterization and catalytic activity in direct arylation reactions

### Abstract

Palladium-catalyzed direct arylation of heteroaromatics has become a popular method for producing carbon–carbon bonds via C–H bond activation. A wide diversity of heteroaromatics such as furan, thiophenes and thiazoles can be used for this reaction. This paper reports the synthesis of N-propylphthalimide-substituted bis-(NHC)PdX2 complexes (NHC = N-heterocyclic carbene), and their catalytic activity in direct arylation reactions. The complexes have been prepared from Ag(I)NHC precursors by transmetallation and characterized by spectroscopy and elemental analysis. The bis-(NHC)PdX2 complexes show excellent activity as catalysts in the direct arylation reactions of 2-n-butylfuran, 2-n-butylthiophene and 2-isopropylthiazole.

Datum: 07.11.2017

Synthesis, crystal structures, luminescence, and photocatalytic properties of two 1D Co(II) coordination polymers constructed with semirigid bis(benzimidazole) and dicarboxylate ligands

### Abstract

Two ternary cobalt(II) coordination polymers (CPs), namely [Co(L1)(npht)] n (1) and {[Co2(L2)2(npht)2(H2O)]·H2O} n (2) (L1 = 4,4′-bis(benzimidazol-1-ylmethyl)biphenyl, L2 = 1,2-bis(5,6-dimethylbenzimidazol-1-ylmethyl)benzene, and H2npht = 4-nitrophthalic acid) have been synthesized and structurally characterized by X-ray crystallography. Both CPs feature similar 1D infinite chains containing two distinct loops. CP 1 further forms a 3D supramolecular network via weak C–H···O hydrogen bond interactions. CP 2 shows a 1D two-layer chain structure, assembled through ππ stacking interactions. The electrochemical, luminescence, and photocatalytic activities of the two CPs for the removal of methylene blue under visible or UV light were investigated. Possible photocatalytic mechanisms are discussed.

Datum: 01.11.2017

Transition metal tetrapentafluorophenyl porphyrin catalyzed hydrogen evolution from acetic acid and water

### Abstract

The performance of Cu (1), Co (2) and Zn (3) complexes of meso-tetrakis(pentafluorophenyl)porphyrin in the electrocatalyzed evolution of hydrogen has been investigated. In acetic acid media, hydrogen evolution turnover frequency (TOF) values for complexes 1, 2 and 3 were 22.1, 19.8 and 18.1 h−1, respectively, at an overpotential of 942 mV versus Ag/AgNO3. In buffer solution at pH 7.0, the corresponding hydrogen evolution TOF values increased dramatically, to 266, 234, 218 h−1 at a similar overpotential of 878 mV versus SHE. The Faradaic yields of 1, 2, and 3 for sustained proton reduction in catalytic experiments at a glassy carbon electrode over 72 h were 89.7, 90.4 and 91.0%, respectively, with no observable catalyst decomposition.

Datum: 01.11.2017

Organophosphines in organoplatinum complexes: structural aspects of PtPCX 2 (X = OL, NL, Cl, SL, SeL, SiL, Br or I) derivatives

### Abstract

In this review are classified and analyzed the structural parameters of eighty monomeric organoplatinum complexes with inner coordination spheres of PtPCX2 (X = OL, NL, Cl, SL, SeL, SiL, Br or I). These complexes crystallized in four crystal systems: cubic, orthorhombic, monoclinic and triclinic. Distorted square planar environments about the Pt(II) atoms are built up from monodentate, homobidentate, heterobidentate and heterotridentate donor ligands. The chelating ligands create wide varieties of metallocycles. These are discussed in terms of the coordination about the platinum atom, and correlations are drawn between donor atoms, bond lengths and interbond angles, with particular attention to any trans-influence. There are complexes with cis- as well as trans-configurations, but the former by far prevail. The Pt–L bonds in the complexes with cis-configuration appear to be more polar and presumably weaker than those in their trans-partners.

Datum: 01.11.2017

Palladacycles incorporating a carboxylate-functionalized phosphine ligand: syntheses, characterization and their catalytic applications toward Suzuki couplings in water

### Abstract

A series of acetato-bridged [C^X]-type (C = aryl carbanion, X = N, P) palladacycles (15) of the general formula [Pd(μ-CH3COO)(C^X)]2 were synthesized as metal precursors via slightly modified procedures. However, in the case of complex 5 with Dpbp (Dpbp = 2′-(diphenylphosphino-κP)[1,1′-biphenyl]-2-yl-κC) as the supporting C^P ligand, an unexpected dinuclear complex [Pd(μ-CO2)(Dpbp)]2 (6) was obtained as a by-product and structurally determined by X-ray crystallography. The reactions of complexes 14 with 2-(diphenylphosphino)benzoic acid conveniently afforded four carboxylate-functionalized phosphine complexes [Pd(C^N)(Dpb)] (Dbp = 2-(diphenylphosphino-κP)benzoato-κO, 710), two of which (9/10) are newly synthesized in the present work and have been fully characterized. A comparative catalytic study revealed that complex [Pd(Ppy)(Dpb)] (7) (Ppy = 2-(2-pyridinyl-κN)phenyl-κC) is the best performer in Suzuki cross-couplings in H2O. In addition, complex 7 exhibits much better catalytic activity compared to the non-functionalized phosphine equivalent [Pd(OAc)(PPh3)(Ppy)] (11), which clearly indicates the superiority of incorporating a carboxylate-functionalized phosphine ligand into the palladacycles. A preliminary mechanistic study uncovered a different precatalyst initiation pathway compared to other known analogues of catalyst precursors.

Datum: 01.11.2017

Synthesis, crystal structures, and luminescent properties of three cluster-based heterometallic and monometallic compounds

### Abstract

Two heterometallic cluster compounds and one monometallic cluster compound, namely [Ni9Co6(PMIDA)6(BTC)2(H2O)12]·6H2O (1), [Co13Zn2(PMIDA)6(H2O)18]·6NO3·15H2O (2), and [Fe15(PMIDA)6(BTC)2(H2O)22]·38H2O (3), have been obtained under hydrothermal conditions using N-(phosphonomethyl)imino-diacetic acid (H4PMIDA) and 1,3,5-benzenetricarboxylate acid (H3BTC) as ligands, and structurally characterized by X-ray crystallography. Compound 1 exhibits a 3D open framework constructed from [Ni9Co6(PMIDA)6(H2O)12]6+ heteronuclear clusters and BTC3− ligands. Compounds 2 and 3 are both zero-dimensional polynuclear clusters, further extended into 3D supramolecular structures via hydrogen-bonding interactions. However, there are some differences in their crystal structures; compound 2 features an isolated spherical heteronuclear cation cluster based on PMIDA4− ligands, such that the NO3 anions only balance the charge, whereas compound 3 is characterized as a neutral monometallic cluster incorporating two different types of organic acid ligands, namely PMIDA4− and BTC3−, and the two BTC3− ligands exhibit regular distribution in each cluster. The luminescence properties of all three compounds have been investigated at room temperature.

Datum: 01.11.2017

Syntheses, crystal structures and magnetic properties of four tetrahydrofuran-2,3,4,5-tetracarboxylato bridged transition metal complexes with N -donor heteroaromatic co-ligands

### Abstract

Four tetrahydrofuran-2,3,4,5-tetracarboxylato complexes, Cu(bpy)(H2THFTC) (1), [Cu(phen)(H2THFTC)]·0.5H2O (2), [Mn(phen)(H2THFTC)]·0.5H2O (3) and [Co4(H2O)4(phen)4(THFTC)2]·4H2O (4) (H4THFTC = tetrahydrofuran-2,3,4,5-tetracarboxylic acid, phen = 1,10-phenanthroline, bpy = 2,2′-bipyridine) were synthesized in aqueous solution or under hydrothermal conditions, and characterized. In compounds 13, the metal centers are bridged by tetrahydrofuran-2,3,4,5-tetracarboxylate anions to form 1D chains, which are further assembled into 2D supramolecular layers based on interchain π···π interactions. Compound 4 consists of tetranuclear [Co4(H2O)4(phen)4(THFTC)2] complex molecules and lattice water molecules. The complex molecules are interconnected into hydrogen-bonded chains along the [100] direction, and interdigitation of phen ligands with interchain π···π stacking interactions assembles the hydrogen-bonded chains into 2D supramolecular layers parallel to the (010) plane. Variable-temperature magnetic measurements show an overall weak ferromagnetic behavior for complexes 1 and 2 and antiferromagnetic behavior for complexes 3 and 4.

### Graphical Abstract

Datum: 01.11.2017

Base hydrolysis of tris(3-(2-pyridyl)-5,6-bis(4-phenyl sulphonic acid)-1,2,4-triazine)iron(II) in aqueous, SDS and CTAB media: kinetic and mechanistic study

### Abstract

The kinetics and mechanism of base hydrolysis of tris(3-(2-pyridyl)-5,6-bis(4-phenyl sulphonic acid)-1,2,4-triazine)iron(II), $${\text{Fe}}({\text{PDTS}})_{3}^{4 - }$$ have been studied in aqueous, sodium dodecyl sulphate (SDS) and cetyltrimethyl ammonium bromide (CTAB) media at 25, 35 and 45 °C under pseudo-first-order conditions, i.e. $$\left[ {\text{OH}^{ - } } \right]$$  ≫  $${\text{Fe}}({\text{PDTS}})_{3}^{4 - }$$ . The reaction is first order each in $${\text{Fe}}({\text{PDTS}})_{3}^{4 - }$$ and hydroxide ion. The rate increases with increasing ionic strength in aqueous and SDS media, whereas this parameter has little effect in CTAB. In SDS medium, the rate-determining step involves the reaction between $$\left[ {\text{OH}^{ - } } \right]$$ and $${\text{Fe}}({\text{PDTS}})_{3}^{4 - }$$ , whereas in CTAB medium, it involves reaction between a neutral ion pair, { $${\text{Fe}}({\text{PDTS}})_{3}^{4 - }$$ ·4CTA+} and $$\left[ {\text{OH}^{ - } } \right]$$ ions. The specific rate constants and thermodynamic parameters (E a, ΔH #, ΔS # and ΔG 35°C # ) have been evaluated in all three media. The near equal values of ΔG 35°C # obtained in aqueous and SDS media suggest that these reactions occur essentially by the same mechanism. Slightly lower ΔG 35°C # values in CTAB medium can be attributed to a higher concentration of reactants in the Stern layer. The reaction is inhibited in SDS medium but catalysed in CTAB. The former can be attributed to the anionic surfactant creating more repellent space between the reactants. Catalysis in CTAB medium is ascribed to electrophilic and hydrophilic interactions between hydroxide ion/substrate with the cationic Stern layer, resulting in increased local concentrations of both reactants.

Datum: 01.11.2017

Synthesis and characterization of iminophosphineplatinum(II) complexes of the type (κ 2 - P,N -2-Ph 2 PC 6 H 4 C(H)=NC 6 H 4 X)PtCl 2 (X = OMe, F)

### Abstract

A series of iminophosphineplatinum(II) complexes have been prepared from pro-ligands derived from aniline derivatives containing electron-donating methoxy groups or electron-withdrawing fluorides and [PtCl2(η 2 − coe)]2 (coe = cis-cyclooctene). All new pro-ligands and metal complexes have been fully characterized, including an X-ray diffraction study for compound 11 (derived from para-methoxyaniline). Additionally, the molecular structure of a di-iminophosphineplatinum dication 11a has been determined. The platinum compounds showed no appreciable cytotoxic properties against two glioma cell lines using the MTT method.

Datum: 01.11.2017

Substitution of aqua ligands from cis -platinum(II) complexes bearing 2-(phenylthiomethyl)pyridine spectator ligands

### Abstract

Cis-Pt(II) complexes, namely [Pt{2-(phenylthiomethyl)pyridine}(H2O)2](CF3SO3)2 Pt(pyS Ph ), [Pt{2-(4-tert-butylphenylthiomethyl)pyridine}(H2O)2](CF3SO3)2 Pt(pyS Ph( t -But) ) and [Pt{2-(4-fluorophenylthiomethyl)pyridine}(H2O)2](CF3SO3)2 Pt(pyS PhF ), were synthesised and characterised. The pK a1 and pK a2 values of the complexes were determined titrimetrically. Substitution of the aqua ligands from these complexes by thiourea nucleophiles was studied at a pH of 2 and ionic strength of 0.1 M under pseudo-first-order conditions using stopped-flow and UV–visible spectrophotometric techniques. Substitution of the aqua ligands depends on both the nature and concentration of the incoming ligand, with low enthalpy and negative entropy of activation values. Substitution of the first and second aqua ligands occurs sequentially and fits the rate laws: k obs (1/2) = k (1/2) [Nu]. The second-order rate constant, k 1, relates to the substitution trans to sulphur, while k 2 is the second-order rate constant for the subsequent substitution of the aqua ligand trans to pyridine. The rate of substitution of the first aqua ligand decreases in the order: Pt(pyS Ph( t -But) ) > Pt(pyS PhF ) > Pt(pyS Ph ), while that of the second decreases in the order: Pt(pyS Ph( t -But) ) > Pt(pyS Ph ) > Pt(pyS PhF ), reflecting the influence of the substituents on the spectator ligands. 195Pt NMR spectra of aged solutions of complexes with the thiourea nucleophile suggest a subsequent but rapid concentration-independent ring opening of the N,S-bidentate ligand to form a PtS 4 species. The crystal structure of Pt(pyS PhF )Cl 2 was elucidated by X-ray diffraction analysis.

Datum: 01.11.2017

A magnetically retrievable heterogeneous copper nanocatalyst for the synthesis of 5-substituted tetrazoles and oxidation reactions

### Abstract

A copper complex anchored on functionalized Fe3O4 nanoparticles was prepared by a simple and inexpensive procedure using commercially available materials. The prepared catalyst was characterized by a range of physical and spectroscopic techniques. Ease of operation, high efficiency, eco-friendly procedure, easy separation of the catalyst and reusability for several consecutive runs without significant loss of its activity are several advantages of this catalyst. The catalytic activity has been explored for the oxidation of sulfides, oxidative coupling of thiols and synthesis of 5-substituted tetrazoles.

### Graphical Abstract

A magnetically retrievable heterogeneous copper nanocatalyst for the synthesis of 5-substituted tetrazoles and oxidation reactions

Datum: 01.11.2017

A thiosemicarbazone–palladium(II)–imidazole complex as an efficient pre-catalyst for Suzuki–Miyaura cross-coupling reactions at room temperature in aqueous media

### Abstract

A Pd(II) complex of two sterically crowded ligands, specifically an N,S-donor thiosemicarbazone and an N-donor imidazole, has been synthesized and characterized by physicochemical and spectroscopic methods. X-ray single-crystal analysis revealed that the coordination geometry around the palladium center is distorted square planar, and the chloride ligand is involved in intermolecular bifurcated X–H···Y-type (where X = C, N and Y = Cl) hydrogen bonding. This complex proved to be a highly active and retrievable pre-catalyst for additive-free Suzuki–Miyaura cross-coupling reactions of arylboronic acids with aryl bromides or chlorides at room temperature and 60 °C, respectively. The reactions require a low catalyst loading and the complex is converted to ~1.5–2.0 nm-sized Pd nanoparticles (probably the real catalyst). The catalyst can be reused up to seven times without significant loss in activity. Since the reaction proceeds under mild conditions in aqueous medium and the catalyst is recoverable, it provides an environmentally benign alternative to the existing protocols for Suzuki–Miyaura reactions.

### Graphical abstract

Biaryls can be synthesized in high yield under greener reaction conditions in the presence of efficient pre-catalyst, thiosemicarbazone–palladium(II)–imidazole.

Datum: 01.11.2017

Electrochemical and photochemical hydrogen generation by a water soluble cobalt(II) complex of 2,2-bipyridine

### Abstract

A molecular catalyst based on a cobalt(II) complex, [(bpy)2Co(SCN)(Cl)] 1, has been prepared by the reaction of 2,2-bipyridine (bpy), CoCl2·6H2O, and KSCN. The complex has been investigated for both electrocatalytic hydrogen generation and photocatalytic hydrogen generation from purely aqueous solution. Under photoirradiation with blue light (λ max = 469 nm), with [Ru(bpy)3]Cl2 as a coupled photosensitizer and ascorbic acid (H2A) as a sacrificial electron donor in pH 5.0 aqueous solution, complex 1 possesses good activity with an initial turnover rate of 2.7 × 103 mol of H2 per mole of catalyst for the first 3 h of photolysis. This activity can be sustained for at least 10 h with a turnover number of 1.2 × 104 mol of H2 per mole of catalyst. Additionally, complex 1 electrocatalyzes hydrogen generation from neutral water (pH 7.0) with a turnover frequency of 809 mol of hydrogen per mole of catalyst per hour at an overpotential of 837.6 mV.

Datum: 01.11.2017

Crystal structure, spectroscopic and thermal properties of copper(II) and manganese(II) coordination polymers based on triazole-benzoic acid ligands

### Abstract

Two transition metal coordination polymers {[Cu(tba)2(H2O)]·2H2O} n (1) and {[Mn(Htta)2(H2O)2]·2H2O} n (2) {Htba = 3-[1,2,4]triazol-1-yl-benzoic acid, H2tta = 2-[1,2,4]triazol-1-yl-terephthalic acid} have been synthesized under solvothermal conditions. Both complexes have been characterized by single-crystal X-ray diffraction, X-ray powder diffraction, elemental analysis and FTIR spectroscopy. Complex 1 has a 1-D chain structure in which Cu(II) atoms are doubly bridged by tba ligands, which is further stabilized by hydrogen bonding and ππ stacking interactions to give a 3-D supramolecular framework. In complex 2, Mn(II) atoms are doubly bridged by Htta ligands to form 1-D chains, which are further connected by intermolecular hydrogen bonds to form a 3-D supramolecular framework. The electronic spectra and thermal behaviors of complexes 1 and 2 are also reported.

Datum: 31.10.2017

Deactivation of a ruthenium(II) N -heterocyclic carbene p -cymene complex during transfer hydrogenation catalysis

### Abstract

A ruthenium (II) N-heterocyclic carbene (NHC) complex was synthesized to investigate ligand dissociation as a possible deactivation pathway for the catalytic cycle of a transfer hydrogenation reaction. Diiodo(1,3-dimethylbenzimidazole-2-ylidene)(p-cymene)ruthenium(II) was synthesized for use as the catalytic species and characterized using physico-chemical, spectroscopic methods, and single crystal X-ray diffraction. The transfer of hydrogen from isopropanol to acetophenone was followed using 1H NMR. We observed 94% conversion of the substrate to the alcohol product after 1 h. We also found that the p-cymene complex decomposed during the catalytic reaction to the extent of 80% deactivation after 1 h, based on 1H NMR spectrometry. From Gaussian calculations, an ultraviolet–visible spectrum that is in excellent agreement with the actual spectrum was computed, giving insight into the nature of the absorptions observed experimentally.

Datum: 30.10.2017

Synthesis, crystal structures, adsorption and fluorescence properties of coordination polymers based on a semirigid octadentate ligand

### Abstract

Using an octadentate ligand, namely tetrakis[(3,5-dicarboxyphenoxy)methyl] methane (H8L), four coordination polymers, [Ni3L(OH)2(H2O)2][NH2(CH3)2]4·5H2O (1), [Co4L(H2O)4]·9H2O (2), [Zn4L(H2O)4]·DMF·11H2O (3) and [Li4(H4L)(H2O)4] (4) (DMF = N,N-dimethylformamide), have been solvothermally synthesized and structurally characterized by X-ray crystallography. Complex 1 is an anionic three-dimensional open framework built from tricluster {Ni3(COOR)8} and square planar L ligands to give a uninodal 6-connected pcu network. Complexes 2 and 3 are isostructural, possessing a non-interpenetrated three-dimensional network with rare (4,8)-connected scu topology. Complex 4 consists of 4-connecting {Li2(COOR)4} clusters which form a 2D Shubnikov tetragonal plane net with sql topology. Complexes 1–3 all have large solvent accessible voids, but only complex 3 possesses permanent porosity as confirmed by N2, H2, CO2 and CH4 gas adsorption measurements. In addition, complex 3 shows strong photoluminescent emissions at room temperature with a peak at 365 nm, owing to a ligand-centered excited state. The emission intensities of 3 varied upon contact with different solvents or analytes.

Datum: 28.10.2017

A one-dimensional Mn(II)-based metal organic oxide: structure and properties

### Abstract

A one-dimensional metal organic oxide of Mn(II), with formula [Mn3(OH)2(Hpdc)2]n (H3pdc = 3,5-pyrazoledicarboxylic acid), was prepared via the hydrothermal method and its structure solved by single-crystal X-ray diffraction. The compound exhibits a three-dimensional framework structure, comprising three crystallographically unique Mn atoms bridged by OH ligands (O9 and O10) and O atoms from the Hpdc ligands, forming one-dimensional metal–organic oxide chains. Two kinds of magnetic exchange are observed: a strong antiferromagnetic intra-chain interaction, arising from the short distance between Mn(II) centers, and a ferromagnetic inter-chain interaction, due to the larger distances between the chains. The compound shows good photocatalytic activity for the decomposition of methylene blue in aqueous medium under simulated sunlight.

Datum: 01.10.2017

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