A cobalt(II) coordination polymer constructed with the 2-carboxy-phenoxyacetate linker showing a corrugated layer structure: synthesis, structure analysis and magnetic properties

2020 ◽  
Vol 75 (6-7) ◽  
pp. 577-581 ◽  
Author(s):  
Zhong-Xiang Du ◽  
Jun-Xia Li
Keyword(s):  
Coordination Polymer ◽  
Potassium Hydroxide ◽  
Hydrothermal Reaction ◽  
Layer Structure ◽  
Variable Temperature ◽  
Antiferromagnetic Coupling ◽  
Phenoxyacetic Acid ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data ◽  
Structure Synthesis

AbstractA new binary CoII coordination polymer, [Co(2-cpa)2(H2O)]n (1) has been synthesized by a hydrothermal reaction of cobalt(II) acetate tetrahydrate and 2-carboxy-phenoxyacetic acid (2-H2cpa) in the presence of potassium hydroxide. Structural analysis revealed that the central CoII ion is in an octahedral geometry coordinated with one aqua and five oxygen atoms of three 2-carboxy-phenoxyacetate (2-cpa) ligands. The 2-cpa anions function as pentadentate double bridging chelate-μ3 linkers binding neighboring CoII ions together, to form an unusual corrugated (4,4)-connected layer. Variable-temperature magnetic susceptibility data in the 2–300 K temperature range indicates a weak antiferromagnetic coupling between adjacent cobalt(II) ions.

A (4,4)-connected zinc(II) coordination polymer constructed with the flexible 2-carboxy phenoxyacetate ligand: synthesis, conformation alteration and fluorescent properties

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jun-Xia Li ◽  
Tian Zhang ◽  
He-Jun Chen ◽  
Zhong-Xiang Du
Keyword(s):  
Coordination Polymer ◽  
Hydrothermal Reaction ◽  
Layer Structure ◽  
Fluorescence Emission ◽  
Phenoxyacetic Acid ◽  
X Ray Diffraction ◽  
Fluorescent Properties ◽  
Sulfate Heptahydrate ◽  
X Ray ◽  
Related Compounds

Abstract A new binary ZnII coordination polymer, [Zn(2-cpa)(H2O)] n (2D-Zn) has been prepared by a 120 °C hydrothermal reaction of zinc(II) sulfate heptahydrate and 2-carboxy phenoxyacetic acid (2-H2cpa) in the presence of potassium hydroxide. Single-crystal X-ray diffraction analysis shows that the ZnII ion is located in a deformed ZnO6 octahedron bonded by one water and three 2-carboxy phenoxyacetate (2-cpa) ligands. The 2-cpa exhibits pentadentate double bridging chelate-μ 3 coordination mode and connects adjacent ZnII ions to generate a corrugated (4,4)-connected layer structure. The structures, conformation of 2-cpa and photoluminescence spectra for 2D-Zn have been carefully analyzed and compared with its two closely related compounds ̶ 1D [Zn(2-cpa)(H2O)] n (1D-Zn) and mononuclear [Zn(2-cpa)(H2O)3] (0D-Zn). The results showed that the conformation of 2-cpa in 2D-Zn has the maximum alteration and the corresponding fluorescence emission peak of 2D-Zn has the largest red-shift of 62 nm compared with that of free 2-H2cpa.

Synthesis, structure and magnetic properties of a binuclear copper(II) complex constructed by a new coordination mode of the tetrachlorophthalate ligand

2016 ◽  
Vol 71 (1) ◽  
pp. 45-49 ◽  
Author(s):  
Jun Zhang ◽  
Jun-Xia Li
Keyword(s):  
Binuclear Complex ◽  
Coordination Mode ◽  
Variable Temperature ◽  
The Other ◽  
Antiferromagnetic Coupling ◽  
Binuclear Copper ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data ◽  
Variable Temperature Magnetic Susceptibility ◽  
Binuclear Structure

AbstractA binuclear complex [Cu2(tcpa)2(bipy)2(H2O)3] (1) (H4tcpa = tetrachlorophthalic acid, bipy = 2,2′-bipyridine) has been synthesized and structurally characterized. Two independent CuII centers Cu1 and Cu2 are both five-coordinated in distorted square pyramids. The tetrachlorophthalate (tcpa2–) anions show a new coordination mode: one is monodentate at Cu1, and the other displays a bridging μ2-O,O″ fashion linking Cu1 and Cu2, thus forming the binuclear structure of 1. Variable-temperature magnetic susceptibility data show weak antiferromagnetic coupling between the two CuII ions.

The syntheses, structures, and magnetic properties of two mononuclear manganese(II) complexes involving in situ hydrothermal decarboxylation

2020 ◽  
Vol 75 (6-7) ◽  
pp. 567-575
Author(s):  
Zhong-Xiang Du ◽  
Jun-Xia Li ◽  
Shi-Jiang Liu ◽  
Zhi-Qiong Wang ◽  
Qing-Jie Pan
Keyword(s):  
Hydrothermal Reaction ◽  
Variable Temperature ◽  
Three Dimensional ◽  
Antiferromagnetic Coupling ◽  
Distorted Octahedral Geometry ◽  
Hydrothermal Conditions ◽  
Susceptibility Data ◽  
3D Network ◽  
Bidentate Chelate

AbstractTwo new mononuclear compounds [Mn(3-Br-pydc)(H2O)3] (1) and {[Mn(5-Br-pyc)(bipy)(H2O)(Cl)]·2H2O (2) (3-Br-H2pydc = 3-Br-pyridine-2,6-dicarboxylic acid, 5-Br-Hpyc = 5-Br-pyridine-2-carboxylic acid, bipy = 2,2′-bipyridine) have been synthesized by traditional solution reaction and hydrothermal reaction, respectively. In both compounds, the MnII center is six-coordinated in a distorted octahedral geometry, formed by one tridentate chelate 3-Br-pydc dianion and three water molecules in 1, while the coordination sphere consists of one bidentate chelate 5-Br-pyc anion, one bipy, one water molecule, and one chloride anion in 2 (MnNO5 for 1 and MnN3O2Cl for 2). O–H⋯O hydrogen bonds, Br⋯O halogen bonds, and/or π-π stacking assist in the construction of the three-dimensional (3D) network structures of 1 and 2. Notably, the 5-Br-Hpyc ligand was generated in situ by decarboxylation of the 3-Br-H2pydc precursor under hydrothermal conditions. Variable-temperature magnetic susceptibility data in the 2–300 K temperature range indicate weak antiferromagnetic coupling in both 1 and 2.

A three-dimensional manganese(II) coordination polymer with two functional properties: magnetism and photochemical detection

2021 ◽  
Vol 77 (12) ◽  
Author(s):  
Dan Zhao ◽  
Yanyan An ◽  
Tingting Guo ◽  
Juanzhi Yan ◽  
Danmei Song
Keyword(s):  
Coordination Polymer ◽  
Hydrothermal Reaction ◽  
Three Dimensional ◽  
Building Blocks ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Detection Mechanism ◽  
Susceptibility Data ◽  
Dichromate Ions ◽  
Ditopic Ligand

Hydrothermal reaction of Mn2+ with the ditopic ligand 2,5-bis(1H-1,2,4-triazol-1-yl)benzoic acid (Hdtba) resulted in the complex poly[aqua[μ3-2,5-bis(1H-1,2,4-triazol-1-yl)benzoato-κ3 N 4:N 4′:O]chloridomanganese(II)] monohydrate], {[Mn(C11H7N6O2)Cl(H2O)]·H2O} n , (I). Coordination polymer I has been characterized by X-ray diffraction, IR spectroscopy, elemental analysis, thermogravimetry and susceptibility measurements. The topology of I corresponds to a three-dimensional (3,6)-conn net linked by {Mn2Cl2(COO)2} building blocks and dtba− anions. Significant antiferromagnetic exchange is observed within the dinuclear {Mn2Cl2(COO)2} subunits. A fit of the susceptibility data resulted in the magnetic parameters g = 1.93 and J = −1.52. Studies of the photoluminescence properties revealed that I represents a promising luminescence sensor for sensitively detecting dichromate ions in aqueous solution. The associated photochemical detection mechanism was studied in detail.

A new one-dimensional cadmium(II) coordination polymer incorporating 4-[4-(1H-imidazol-1-yl)phenyl]pyridine and 5-hydroxybenzene-1,3-dicarboxylate ligands

2016 ◽  
Vol 72 (5) ◽  
pp. 389-392 ◽  
Author(s):  
Zhi-Liang Zhang ◽  
Jia-Cheng Liu
Keyword(s):  
Coordination Polymer ◽  
Hydrothermal Reaction ◽  
Layer Structure ◽  
Rapid Development ◽  
Distorted Octahedral Geometry ◽  
One Dimensional ◽  
Design And Synthesis ◽  
Distorted Octahedral ◽  
Title One ◽  
Dianionic Ligands

The design and synthesis of new organic lgands is important to the rapid development of coordination polymers (CPs). However, CPs based on asymmetric ligands are still rare, mainly because such ligands are usually expensive and more difficult to synthesize. The new asymmetric ligand 4-[4-(1H-imidazol-1-yl)phenyl]pyridine (IPP) has been used to construct the title one-dimensional coordination polymer,catena-poly[[[aqua{4-[4-(1H-imidazol-1-yl-κN3)phenyl]pyridine}cadmium(II)]-μ-5-hydroxybenzene-1,3-dicarboxylato-κ3O1,O1′:O3] monohydrate], {[Cd(C8H4O5)(C14H11N3)2(H2O)]·H2O}n, under hydrothermal reaction of IPP with CdIIin the presence of 5-hydroxyisophthalic acid (5-OH-H2bdc). The CdIIcation is coordinated by two N atoms from two distinct IPP ligands, three carboxylate O atoms from two different 5-OH-bdc2−dianionic ligands and one water O atom in a distorted octahedral geometry. The cationic [Cd(IPP)2]2+nodes are linked by 5-OH-bdc2−ligands to generate a one-dimensional chain. These chains are extended into a two-dimensional layer structureviaO—H...O and O—H...N hydrogen bonds and π–π interactions.

Solvent-Dependent Access to Two Different Ni4II Core Topologies from the First Use of Pyridine-2,6-dimethanol in Nickel(II) Cluster Chemistry

2012 ◽  
Vol 65 (12) ◽  
pp. 1608 ◽  
Author(s):  
Konstantina I. Alexopoulou ◽  
Catherine P. Raptopoulou ◽  
Vassilis Psycharis ◽  
Aris Terzis ◽  
Vassilis Tangoulis ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Direct Current ◽  
Variable Temperature ◽  
Structural Features ◽  
The Other ◽  
Cluster Chemistry ◽  
Magnetic Susceptibility Data ◽  
Tetranuclear Cluster ◽  
Susceptibility Data ◽  
Oxygen Atoms

The use of pyridine-2,6-dimethanol, pdmH2, in reactions with nickel(ii) acetate has led to two Ni4 clusters, depending on the solvent. [Ni4(O2CMe)4(pdmH)4]·MeCN (1·MeCN) can be obtained from MeCN and [Ni4(O2CMe)6(pdmH)2(EtOH)2]·1.2EtOH (2·1.2EtOH) from EtOH. Each cluster can be converted into the other in the appropriate solvent. The tetranuclear cluster molecule 1 possesses a distorted cubane {Ni4(μ3-OR)4}4+ core (RO– = pdmH–) with the NiII atoms and the alkoxide-type oxygen atoms from the η3 : η1 : μ3 pdmH– ligands occupying alternate vertices of the cube; four η1 : η1 : μ MeCO2– groups cap four faces of the cube. The four NiII atoms in molecule 2 are located at four vertices of a defective dicubane and are bridged by six oxygen atoms, two μ3 from the η3 : η1 : η1 : μ3 pdmH– ligands and four from four monoatomically bridging MeCO2– groups; peripheral ligation is provided by two η1 : η1 : μ MeCO2– groups and two terminal EtOH ligands. IR data are discussed in terms of the coordination modes of the ligands. Variable-temperature direct-current magnetic susceptibility data of 1 and 2 were modelled with two and three J values respectively, indicating diamagnetic ground states (S = 0). The sign and the magnitude of the J values are discussed in terms of structural features of the complexes.

Manganese(II) Oxazolidine Nitroxide Chelates: Structure, Magnetism, and Redox Properties

2014 ◽  
Vol 67 (11) ◽  
pp. 1618 ◽  
Author(s):  
Ian A. Gass ◽  
Mousa Asadi ◽  
David W. Lupton ◽  
Boujemaa Moubaraki ◽  
Alan M. Bond ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Intramolecular Interaction ◽  
Variable Temperature ◽  
Field Measurements ◽  
X Ray Diffraction ◽  
Magnetic Susceptibility Data ◽  
X Ray ◽  
Susceptibility Data ◽  
Variable Temperature Magnetic Susceptibility ◽  
Radical Interaction

The mononuclear oxazolidine nitroxide complex [MnII(L•)2](ClO4)2 (1) (L•, 4-dimethyl-2,2-di(2-pyridyl)oxazolidine N-oxide) has been synthesized and investigated using single-crystal X-ray diffraction, variable-temperature magnetic susceptibility measurements, and electrochemistry. The structural analysis reveals bond lengths compatible with a linear L•–MnII–L• arrangement where the ligands are in the neutral ligand form and the central MnII ion is high spin (S = 5/2). Although analysis of the variable-temperature magnetic susceptibility data suggests a strong antiferromagnetic metal–radical interaction, the radical–radical intramolecular interaction could not be determined unambiguously from such fits. The resultant isolated S = 3/2 ground state is confirmed by low-temperature magnetization versus field measurements. Electrochemical studies reveal similar square schemes and redox intermediates to the previously reported analogues [FeII(L•)2][BF4]2 and [CoII(L•)2][NO3]2.

Syntheses, crystal structures, and magnetism of one-dimensional complexes generated from copper(II) and carbamyldicyanomethanide bridging ligand

2004 ◽  
Vol 82 (3) ◽  
pp. 483-489 ◽  
Author(s):  
Jing-Min Shi ◽  
Qing-Yun Liu ◽  
Wen Xu ◽  
Lin Meng ◽  
Peng Cheng ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Variable Temperature ◽  
Ligand Complex ◽  
Bridging Ligands ◽  
Magnetic Susceptibility Data ◽  
One Dimensional ◽  
X Ray Crystallography ◽  
Susceptibility Data ◽  
Bridging Ligand ◽  
Chain Complexes

Two one-dimensional chain complexes, {[Cu(cda)2H2O]·H2O}n (1) and {[Cu(cda)(H2O)2]·(ClO4)·3H2O}n (2) (cda = carbamyldicyanomethanide anion) have been synthesized and their crystal structures determined by X-ray crystallography. The copper(II) ions in 1 are bridged by two µ1,5-cda bridging ligands, whereas in 2 the copper(II) ions are connected by a single µ1,5-cda ligand. Complex 1 is red while 2 is green. Variable-temperature magnetic susceptibility data indicate that there is a very weak antiferromagnetic interaction between the bridged copper(II) ions in both 1 and 2.Key words: synthesis, crystal structure, copper complex, polynitrile ligand, magnetism.

Preparation, electrochemical behavior, and variable-temperature magnetic properties of Co(3,5-DBSQ)2 complexes of imidazole- or pyrazole-substituted ligands

2015 ◽  
Vol 93 (7) ◽  
pp. 769-774 ◽  
Author(s):  
Carolyn Dowling ◽  
Danielle R. Dinsdale ◽  
Martin T. Lemaire
Keyword(s):  
Magnetic Susceptibility ◽  
High Spin ◽  
Density Functional ◽  
Variable Temperature ◽  
Density Functional Theory Calculations ◽  
Functional Theory ◽  
Magnetic Susceptibility Data ◽  
Valence Tautomerism ◽  
Susceptibility Data ◽  
Variable Temperature Magnetic Susceptibility

Herein we describe the preparation of four new Co(3,5-DBSQ)2 containing known 2-(2-pyridyl)benzimidazole 1, 2,2′-bisbenzimidazole 2, or 2,2-(1H-pyrazole-3,5-diyl)dipyridine 3. We investigate the electronic and variable-temperature magnetic susceptibility properties of these complexes. Complexes containing 2 and 3 are bimetallic and variable-temperature magnetic susceptibility data suggest observation of a stable intermediate (high-spin and low-spin) state for the bimetallic complex with 3, which does undergo valence tautomerism. Complexes 4–6 containing imidazole-based ligands 1 and 2 feature high-spin ground states and no valence tautomerism is observed in these materials. This experimental finding is corroborated with density functional theory calculations, which support the existence of a stable high-spin ground state in these complexes.

Crystal Structures and Magnetic Properties of (2,2'-Dipyridyl)-(3-methoxysalicylaldiminato)copper(II) Perchlorate and (2,2'-Dipyridyl)-(4-methoxysalicylaldiminato)copper(II) Perchlorate

2002 ◽  
Vol 57 (5) ◽  
pp. 519-523 ◽  
Author(s):  
Y. Elerman ◽  
A. Elmali ◽  
I. Svoboda
Keyword(s):  
Magnetic Properties ◽  
Crystal Structures ◽  
Effective Magnetic Moment ◽  
Variable Temperature ◽  
Mixed Ligand ◽  
Dinuclear Complexes ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data ◽  
Variable Temperature Magnetic Susceptibility ◽  
Dimeric Unit

The mixed-ligand dinuclear complexes (2,2'-dipyridyl)-(3-methoxysalicylaldiminato)copper( II) perchlorate (1) and (2,2'-dipyridyl)-(4-methoxysalicylaldiminato)copper(II) perchlorate (2)were synthesized and their crystal structures determined. Both structures consist of a dimeric unit involving a planar Cu2O2 group. In both structures, the coordination sphere of the Cu atoms can be described as an elongated octahedron where the basal plane is formed by the twoN atoms of the 2,2'-dipyridyl molecule and the two O atoms of the salicylaldehyde anion. The phenoxo O atom is the negative ligand of the monomeric unit. Two apical Cu-O contacts complete the 4+2 coordination of the Cu atoms. They correspond to one of the O atoms of the perchlorate anion and to the O atom of the nearest salicylaldehyde molecule. Variable-temperature magnetic susceptibility data obey the Curie-Weiss law with Θ = -10.3(2) K for 1 and -10.1(2) K for 2. The decrease of the effective magnetic moment from 1.89(7) μB at 300 K to 1.77(7) μB at 70 K for 1 and from 1.88(8) μB at 300 K to 1.76(8) μB at 70 K for 2 and the negative Weiss constants indicate weak antiferromagnetic interactions between the two copper atoms in the dimeric units.

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