Synthesis, Crystal Structure and Spectroscopic Properties of an Oximato Bridged Cu(II) Dimer (original) (raw)
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Inorganica Chimica Acta, 2008
A novel linear bis(chlorido)-bridged Cu(II) compound with the ligand 7-azaindole (abbreviated as Haza) have been synthesized and fully characterized by spectroscopy, EPR and X-ray structure analysis. The geometry around the Cu(II) ion in the compound [Cu–μ-Cl2(Haza)2]n, is distorted octahedral with the basal plane formed by two chloride anions with a Cu–Cl distance of 2.286(1)Å and two nitrogen atoms of two trans-chelating Haza ligands with a Cu–N distance of 2.042(4)Å. The apical positions is formed by two chloride anions of a neighbouring unit at a distance of 3.143(2)Å. The Cu–Cl–Cu angle is 90.09(5)°, while the Cu–Cu distance is 3.8890(8)Å.The EPR powder spectrum appears as rhombic, displaying some extra features which were assigned to the differences in orientation of chains in the lattice, as their intensity appears to decrease on powdering. The magnetic susceptibility measurements, recorded from 5 to 300K, agree with a very weak antiferromagnetic interaction in a chain with J=−2.6cm−1.
Acta Crystallographica Section E Structure Reports Online, 2014
In the title compound, [Cu 2 (C 11 H 13 N 3 O 3 S) 2 (C 2 H 6 OS) 2 ], the Cu II cation is N,N 0 ,O-chelated by a deprotonated hydroxyimino-tosylhydrazone ligand and coordinated by a dimethyl sulfoxide molecule. One O atom from the adjacent hydroxyimino-tosylhydrazone ligand bridges the Cu II cation, forming the centrosymmetric dimeric complex. The cation is in an overall distorted N 2 O 3 square-pyramidal coordination environment. The methylbenzene ring is twisted with respect to the hydrazine fragment, with a dihedral angle of 89.54 (9) between the planes. An intramolecular C-HÁ Á ÁO hydrogen bond occurs. In the crystal, molecules are linked by weak C-HÁ Á ÁO and C-HÁ Á ÁS interactions. Weakstacking is also observed between parallel benzene rings of adjacent molecules, the centroid-centroid distance being 3.9592 (17) Å .
Bulletin of the Chemical Society of Ethiopia, 2011
Two new mixed-ligand complexes of formula [Cu(mal)(abpt)(H2O)].3/2H2O (1) and [Cu2(sq)(abpt)2].2H2O (2) [mal = malonate, abpt = 4-amino-3,5-di-2-pyridyl-4H-1,2,4 triazole and sq = squarate], have been prepared and characterized by X-ray crystal structure determination and magnetic studies. Complex 1 crystallizes in the monoclinic system, space group C2/c, with a = 14.0086(2) Å, b = 10.0980(2) Å, c = 25.630(4) Å; β = 97.5900(10) o , and Z = 8. Complex 2 crystallizes in the triclinic system, space group P-1 with a = 7.5696(15) Å, b = 8.4697(17) Å, c = 11.049(2) Å; β = 93.00(3) o , α = 96.98(3), γ = 90.111(3) and Z = 1. Complex 1 consist of a neutral mononuclear [Cu(mal)(abpt)(H2O)] unit and water molecule of crystallization in a distorted square pyramidal coordination sphere, while complex 2 is viewed as being made up of [Cu(sq)(abpt)2] units with the squarato ligand bridging the two copper(II) cations. Variable temperature magnetic behaviour of the complexes reveals the existence of weak antiferromagnetic interaction for complex 1 and weak ferromagnetic intrachain interaction for complex 2.
Zeitschrift für Naturforschung B, 2006
The mixed-ligand picolinato (pic) complex of Cu(II) with 4-methylimidazole (4-MeIm), [Cu(pic)2(4-MeIm)2], was synthesized and characterized by elemental analysis, magnetic susceptibility, spectroscopic methods (UV/vis and FT-IR) and X-ray diffraction. In the slightly distorted octahedral cis-bis(4-methylimidazole)bis(picolinato)copper(II) complex, the pic ligands are coordinated to the Cu(II) ion as bidentate N,O-donors forming chelate rings. The 4-MeIm ligands are N-coordinated in cis positions. The complex crystallizes in the triclinic space group p̅1 with unit cell parameters a = 9.204(5), b = 9.498(5), c = 13.095(5) Å , α = 90.395(5), β = 101.687(5), γ = 112.291(5)° and Z = 2. Hydrogen bondings and C-H ··· π interactions occur between picolinato and methylimidazole ligands of neighboring complex molecules. The thermal decomposition of the complex is described.
Polyhedron, 2007
Reaction of Cu(NO 3) 2 AE 3H 2 O, N,N,N 0 ,N 0-tetramethyl-ethylenediamine (L) and sodium dicyanamide (Nadca) in aqueous medium yields a complex the {[Cu 2 L 2 (l-1,5-dca) 2 (dca) 2 ]} n complex, 1. Single crystal X-ray analysis reveals that complex 1 has a 1D infinite chain structure in which copper(II) ions are bridged by single dicyanamide anions in an end-to-end fashion. The coordination environment around copper(II) is distorted square pyramidal. Two among the four coordination sites of the basal plane are occupied by the nitrogen atoms of the diamine and two remaining sites are occupied by the terminal nitrogen atom of a bridging and of a monodentate dca anions. The fifth coordination site (apical) is occupied by a nitrogen atom from a bridging dca anion of an adjacent CuL(dca) 2 moiety, yielding the [Cu 2 L 2 (l-1,5-dca) 2 (dca) 2 ] dinuclear unit. Dimeric units are connected to each other by single l-1,5-dicyanamido group to form infinite 1D chains which propagate parallel to the crystallographic c-axis. The variable temperature magnetic susceptibility measurements evidenced weakly antiferromagnetic interactions (J = À0.26 cm À1) in {[Cu 2 L 2 (l-1,5-dca) 2 (dca) 2 ]} n , 1.
Journal of Chemical Crystallography
Abstract Butane-2,3-dione bis(2′-pyridylhydrazone) (BDBPH), a Schiff-base condensate, was synthesized by 1:2 mol ratio condensation of butane-2,3-dione with 2-hydrazino pyridine in dehydrated methanol. BDBPH has been characterised by C, H and N microanalyses, FT-IR, 1H NMR and UV–Vis spectra. Reaction of 1:1 stoichiometric proportion of BDBPH with copper(II)perchlorate hexahydrate in methanol affords a mononuclear copper(II) complex, [Cu(BDBPH)(ClO4)2] (1). 1 crystallizes in the monoclinic space group P \( \overline{1} \) with a = 8.4230(2), b = 9.7869(3), c = 12.3508(3) Å, α = 103.784(2), β = 90.900(2), γ = 94.906(2)°, V = 984.51(5) Å3 and Z = 2. The copper(II) compound is octahedral and one-electron paramagnetic. Bond Valence Sum (BVS) model calculation was also performed to assign the oxidation number of the copper center. Index Abstract The X-ray crystal structure (1) of the complex copper(II) with butane-2,3-dione bis(2′-pyridylhydrazone) (BDBPH) reveals that the complex is mononuclear. The Jahn–Teller distorted octahedral copper(II) compound is one-electron paramagnetic.