scholarly journals A polymeric oxovanadium(IV) pyromellitate complex

1999 ◽  
Vol 64 (9) ◽  
pp. 513-518
Author(s):  
Dusanka Vasovic ◽  
Djordje Stojakovic
Keyword(s):  
Ir Spectroscopy ◽  
Potassium Carbonate ◽  
Magnetic Measurements ◽  
Antiferromagnetic Coupling ◽  
Polymeric Complex ◽  
Pyromellitic Acid ◽  
Polymeric Structure

The reaction of oxovanadium(IV) sulphate with 1,2,4,5-benzenetetracarboxylic acid (pyromellitic acid) in the presence of potassium carbonate yields a polymeric complex, K2[VO(pyr)]-6H2O (I) [pyr = pyromellitate(4-) ion]. The PM3(tm) calculations and IR spectroscopy suggest that the polymeric structure of I consists of ?V-pyr-V-pyr- chains formed by the 1,4- or 1,5-bridging by the pyr ions. The chains are additionally cross-linked by the chelate function of one of the COO. groups of the pyr ion. Magnetic measurements do not reveal the presence of antiferromagnetic coupling between the V centers.

Fluorosulfates of palladium

1977 ◽  
Vol 55 (13) ◽  
pp. 2473-2477 ◽  
Author(s):  
K. C. Lee ◽  
F. Aubke
Keyword(s):  
Ground State ◽  
Diffuse Reflectance ◽  
Magnetic Measurements ◽  
Structural Information ◽  
Tridentate Ligand ◽  
Ligand Field ◽  
Polymeric Structure ◽  
Octahedral Environment ◽  
Fluorosulfate Group ◽  
Ligand Field Parameter

The syntheses of Pd(SO3F)2 and Pd(SO3F)3 by the reactions of palladium with BrOSO2F and S2O6F2 are described. Structural information on both compounds is based on infrared, Raman, diffuse reflectance, and electronic mull spectra as well as magnetic measurements from ∼300 to ∼100 K. Palladium bisfluorosulfate is found to have a polymeric structure with the fluorosulfate group acting as a tridentate ligand. As a consequence, an octahedral environment is found for Pd2+ with a 3A2g ground state, a µeff298 value of 3.39 BM and the ligand field parameter Dq = 1177 cm−1 and B = 633 cm−1. Pd(SO3F)3 is best regarded as PdII[PdIV(SO3F)6].

Crystal Structures, Topological Analyses, and Magnetic Properties of Manganese-Dihydroxyterephthalate Complexes

2010 ◽  
Vol 63 (2) ◽  
pp. 286 ◽  
Author(s):  
Qiang Gao ◽  
Fei-Long Jiang ◽  
Ming-Yan Wu ◽  
You-Gui Huang ◽  
Wei Wei ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Crystal Structures ◽  
Magnetic Measurements ◽  
Antiferromagnetic Coupling ◽  
Solvothermal Conditions ◽  
3D Framework

Two manganese(ii)-dihydroxyterephthalate complexes were obtained under solvothermal conditions: [Mn(H2dhtp)(H2O)2] n (1) and [Mn2(dhtp)(H2O)2] n (2) (H4dhtp = 2,5-dihydroxyterephthalate). The 3D framework of complex 1 is constructed by H2dhtp ligands joined to 1D carboxylate-bridged Mn(ii) chains, which features a (4,4)-connected PtS net. Complex 2 contains a novel inorganic honeycomb Mn(ii)–O layer, which is further connected into a 3D (4,8)-connected flu net by dhtp ligands. Magnetic measurements of 1 and 2 were performed in the range of 2–300 K and the results indicate that antiferromagnetic coupling exits in the manganese(ii) centres of both complexes.

scholarly journals Crystal Structure and Characterization of Two Layered Copper(II) Coordination Polymers with Anions of 3-Phosphonopropionic Acid and (RS)-2-Phosphonobutyric Acid

2019 ◽  
Author(s):  
Roberto Köferstein
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Single Crystals ◽  
Magnetic Measurements ◽  
Antiferromagnetic Coupling ◽  
Water Molecules ◽  
Space Group ◽  
Thermoanalytical Investigations ◽  
Copper Cations

Blue single crystals of Cu[μ3-O3P(CH2)2COOH].2H2O (1) and Cu[(RS)-μ3-O3PCH(C2H5)COOH].3H2O (2) have been prepared in aqueous Cu2+-solutions (pH = 2.5–3.5) containing 3-phosphonopropionic acid (1) and (RS)-2-phosphonobutyric acid (2), respectively. 1: Space group Pbca (no. 61) with a = 812.5(2), b = 919.00(9), c = 2102.3(2) pm. Cu2+ is five-fold coordinated by three oxygen atomsstemming from [O3P(CH2)2COOH]2– anions and two water molecules. The Cu-O bond lengths range from194.0(3) to 231.8(4) pm. The connection between the [O3P(CH2)2COOH]2– anions and the Cu2+ cations yields apolymeric structure with layers parallel to (001). The layers are linked by hydrogen bonds. 2: Space group Pbca(no. 61) with a = 1007.17(14), b = 961.2(3), c = 2180.9(4) pm. The copper cations are surrounded by five oxygen atoms in a square pyramidal fashion with Cu-O bonds between 193.6(4) and 236.9(4) pm. The coordination between [O3PCH(C2H5)COOH]2- and Cu2+ results in infinite puckered layers parallel to (001). The layers are not connected by any hydrogen bonds. Each layer contains both R and S isomers of the [O3PCH(C2H5)COOH]2-dianion. Water molecules not bound to Cu2+ are intercalated between the layers.UV/Vis spectra suggest three d-d transition bands at 743, 892, 1016 nm for 1 and four bands at 741, 838, 957and 1151 nm for 2, respectively. Magnetic measurements suggest a weak antiferromagnetic coupling betweenCu2+ due to a super-superexchange interaction. Thermoanalytical investigations in air show that the compounds are stable up to 95 °C (1) and 65 °C (2), respectively.

New Coordination Polymers of Lanthanide(III) with Tetrazole-1-acetic Acid: Synthesis, Crystal Structures, and Magnetic Properties

2008 ◽  
Vol 61 (4) ◽  
pp. 303 ◽  
Author(s):  
Xiu-Qing Zhang ◽  
Qing Yu ◽  
He-Dong Bian ◽  
Shi-Ping Yan ◽  
Dai-Zheng Liao ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Coordination Polymers ◽  
Coordination Mode ◽  
Magnetic Measurements ◽  
Acid Synthesis ◽  
Antiferromagnetic Coupling ◽  
Bidentate Coordination ◽  
X Ray ◽  
X Ray Crystallography ◽  
Lanthanide Cations

New coordination polymers {[Ln(tza)3(H2O)2]·mH2O}n (Ln = LaIII 1 and PrIII 2, m = 2; Ln = NdIII 3, m = 1.5) and {[Sm2(tza)6(H2O)5]·H2O}n 4 (Htza = tetrazole-1-acetic acid) have been synthesized and characterized by IR spectroscopy, elemental analysis, X-ray crystallography, and magnetic measurements. The Htza ligand coordinates to the lanthanide cations through the carboxylate group in a monodentate, bridging bidentate coordination mode or bridging tridentate to two metal centres. Complexes 1 and 2 are isostructural. Complex 3 has a similar structure to 1 and 2, but the arrangement of ligands has changed. Complex 4 consists of two types of metallic molecules. Magnetic measurements show weak antiferromagnetic coupling between the metal centres in complexes 2 and 3.

scholarly journals Spectral, thermal and magnetic properties of Cu(II) and Ni(II) complexes with Schiff base ligands

2011 ◽  
Vol 76 (12) ◽  
pp. 1639-1648 ◽  
Author(s):  
Beata Cristóvão
Keyword(s):  
Thermal Analysis ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Ir Spectroscopy ◽  
Magnetic Measurements ◽  
Magnetic Moments ◽  
Schiff Base Ligands

Mononuclear copper(II) and nickel(II) complexes of the formulae [Cu(L1)] (1), [Ni(L1)] (2), [Cu(L2)] (3) and [Cu(L3)H2O] (4) (where L1 = N,N?-ethylenebis(4,6-dimethoxysalicylidenaminato), L2 = N,N?-ethylenebis(5-bromosalicylidenaminato) and L3 = N,N?-ethylenebis(5-bromo-3-methoxysalicylidenaminato)) were synthesized as microcrystalline powders and characterized by IR spectroscopy, thermal analysis and magnetic measurements. The magnetic susceptibility of the Cu(II) complexes changed with temperature according to the Curie-Weiss law. The complexes 1, 3 and 4 exhibit magnetic moments of 2.29, 2.20 and 1.88 ?B, respectively, at 303 K. These values practically do not change with lowering the temperature to 77 K. The nickel(II) complex 2 is diamagnetic.

scholarly journals Synthesis, Crystal Structure and Magnetic Properties of 1D Chain Complexes Based on Azo Carboxylate Oxime Ligand

2021 ◽  
Vol 7 (7) ◽  
pp. 105
Author(s):  
Min Zeng ◽  
Xi Chen ◽  
Hui-Zhong Kou
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
High Spin ◽  
Magnetic Measurements ◽  
Antiferromagnetic Coupling ◽  
Dimensional Chain ◽  
One Dimensional ◽  
Chain Complexes ◽  
1D Chain ◽  
Oxime Ligand

Two carboxylate-bridged one-dimensional chain complexes, {[MnII(MeOH)2][FeIII(L)2]2}n (1) and {[MnII(DMF)2][MnIII(L)2]2·DMF}n (2) [H2L = ((2-carboxyphenyl)azo)-benzaldoxime], containing a low-spin [FeIII(L)2]− or [MnIII(L)2]− unit were synthesized. Magnetic measurements show that the adjacent high-spin MnII and low-spin MIII ions display weak antiferromagnetic coupling via the syn–anti carboxyl bridges, with J = −0.066(2) cm−1 for complex 1 and J = −0.274(2) cm−1 for complex 2.

scholarly journals Cu(II) complexes with a pendant octaazamacrocycle and µ-bonded aromatic carboxylates

2002 ◽  
Vol 67 (10) ◽  
pp. 677-684 ◽  
Author(s):  
Gordana Vuckovic ◽  
Mirjana Antonijevic ◽  
Dejan Poleti
Keyword(s):  
Crystal Structure ◽  
Ir Spectroscopy ◽  
Elemental Analysis ◽  
Phthalic Acid ◽  
Magnetic Measurements ◽  
Isophthalic Acid ◽  
Mixed Ligand ◽  
The Third ◽  
Aromatic Carboxylates

Three new cationic mixed-ligand Cu(II) complexes with N,N?,N??,N???-tetrakis(2-pyridylmethyl)- 1,4,8,11-tetraazacyclotetradecane (tpmc) and bridging aromatic mono- or dicarboxylate ligands were prepared. Elemental analysis, conductometric and magnetic measurements, as well as electronic and IR spectroscopy were employed for their characteriization. It is proposed that the complexes [Cu2(C6H5COO)tpmc](CIO4)3MeOH and [Cu2(Hpht)tpmc](CIO4). 3H2O(H2pht=phthalic acid) are binuclear with ?-coordination of the carboxylate monoanions. The third complex [Cu4ipht(tpmc)2](CIO4)6NaClO42MeCN (H2ipht=isophthalic acid) is one of the rare tetranuclear Cu(II)-tpmc complexes with an aromatic dicarboxylate ion bridging two Cu2tpmc units. This was also confirmed by preliminary results of the determination of the crystal structure.

scholarly journals Diamagnetic cobalt(III)tris(o-ethylxanthate) and nickel(II)bis(o-ethylxanthate)

2017 ◽  
Vol 16 (2) ◽  
pp. 138-146 ◽  
Author(s):  
Filip Varga ◽  
Ján Titiš ◽  
Cyril Rajnák ◽  
Ján Moncoľ ◽  
Roman Boča
Keyword(s):  
Ir Spectroscopy ◽  
Single Crystal ◽  
Computational Methods ◽  
Magnetic Measurements ◽  
X Ray ◽  
X Ray Crystallography ◽  
Ethyl Xanthate

Abstract Diamagnetic [Co(xanth)3] and [Ni(xanth)2] complexes have been prepared by reaction of Co(II) and Ni(II) salts with potassium O-ethyl xanthate (Kxanth). The isolated Co(III) and Ni(II) complexes have been characterized by single-crystal X-ray crystallography, UV-VIS and IR spectroscopy, computational methods, and magnetic measurements.

scholarly journals A new copper(II) coordination polymer containing chains of interconnected paddle-wheel antiferromagnetic clusters

2017 ◽  
Vol 73 (12) ◽  
pp. 1050-1055 ◽  
Author(s):  
Sofiane Bouheroum ◽  
Aouatef Cherouana ◽  
Adel Beghidja ◽  
Slimane Dahaoui ◽  
Pierre Rabu
Keyword(s):  
Crystal Structure ◽  
Rational Design ◽  
Magnetic Measurements ◽  
Noncovalent Interactions ◽  
Functional Materials ◽  
Antiferromagnetic Coupling ◽  
Polymeric Chain ◽  
Paddle Wheel ◽  
Pyramidal Geometry ◽  
Cl Atoms

The construction of supramolecular architectures based on inorganic–organic coordination frameworks with weak noncovalent interactions has implications for the rational design of functional materials. A new crystalline binuclear copper(II) one-dimensional polymeric chain, namely catena-poly[[[tetrakis(μ-4-azaniumylbutanoato-κ2 O:O′)dicopper(II)(Cu—Cu)]-μ-chlorido-[diaquadichloridocopper(II)]-μ-chlorido] bis(perchlorate)], {[Cu3Cl4(C4H9NO2)4(H2O)2](ClO4)2} n , was obtained by the reaction of 4-aminobutyric acid (GABA) with CuCl2·2H2O in aqueous solution. The structure was established by single-crystal X-ray diffraction and was also characterized by IR spectroscopy and magnetic measurements. The crystal structure consists of [{Cu2(GABA)4}{CuCl4(H2O)2}]+ cations and isolated perchlorate anions. Two symmetry-related CuII centres are bridged via carboxylate O atoms into a classical paddle-wheel configuration, with a Cu...Cu distance of 2.643 (1) Å, while bridging Cl atoms complete the square-pyramidal geometry of the metal atoms. The Cl atoms connect the paddlewheel moieties to a second CuII atom lying on an octahedral site, resulting in infinite helical chains along the c axis. The packing motif exhibits channels containing free perchlorate anions. The crystal structure is stabilized by hydrogen bonds between the perchlorate anions, the coordinated water molecules and the ammonium groups of the polymeric chains. The magnetic analysis of the title compound indicates a nontrivial antiferromagnetic behaviour arising from alternating weak–strong antiferromagnetic coupling between neighbouring CuII centres.

A three-dimensional cyanide-bridged heterometallic coordination polymer: poly[[diacetonitrilediaqua[μ2-3,6-bis(pyridin-2-yl)-1,2,4,5-tetrazine-κ4N1,N6:N3,N4]tetra-μ-cyanido-tetracyanidodimanganese(II)molybdate(IV)] dihydrate]

2014 ◽  
Vol 70 (11) ◽  
pp. 1029-1032 ◽  
Author(s):  
Xiao-Juan Xu
Keyword(s):  
Magnetic Properties ◽  
Ir Spectroscopy ◽  
Coordination Polymer ◽  
Elemental Analysis ◽  
Room Temperature ◽  
Three Dimensional ◽  
Antiferromagnetic Coupling ◽  
X Ray Diffraction ◽  
X Ray ◽  
Magnetic Investigation

A metal coordination polymer, {[Mn2Mo(CN)8(C12H8N6)(CH3CN)2(H2O)2]·2H2O}n, has been synthesized by the reaction of Mn(ClO4)2·6H2O with 3,6-bis(pyridin-2-yl)-1,2,4,5-tetrazine (bptz) and (Bu3N)3[Mo(CN)8] at room temperature. The polymer was characterized by IR spectroscopy, elemental analysis and X-ray diffraction, and the magnetic properties were also investigated. The X-ray diffraction analysis reveals that the compound is a new three-dimensional coordination polymer with a PtS-type network. Magnetic investigation shows antiferromagnetic coupling between adjacent Mn2+cations.

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