Jing-Yuan Xu

Synthesis, structure and properties of terephthalate-bridged copper (II) polymeric complex with zigzag chain

Abstract The complex, {[ Cu L ( μ 2 -ta )]( CH 3 OH ) 2 } n (L=N,N-dimethyl-N′-(pyrid-2-ylmethyl)-ethylene-diamine, ta=terephthalic acid dianion), has been synthesized. X-ray analyses revealed that the copper atom exhibits a distorted square pyramidal geometry, with three nitrogen atoms from the tridentate ligand and two carboxylato-oxygen atoms from different tas. Each ta ligand adopts a μ2-bridging mode with a typical average Cu–O distance (1.945–2.204 A), and the tridentate ligand acts as a terminal ligand with a typical Cu–N distance (1.992–2.087 A). Thus, each ta ligand links two metal centers and each metal center connects two ta ligands to form the zigzag chain structure. Variable temperature magnetic measurement of the complex shows that a weak ferromagnetic interaction between the copper(II) ions.

Synthesis and crystal structure of nickel complex of N,N-bis(benzimidazol-2-yl-methyl)amine

Abstract A new nickel(II) complex, [NiL 2 ]Cl 2 (L= N , N -bis(benzimidazol-2-yl-methyl)amine), was synthesized and its crystal structure was determined. According to X-ray crystallographic studies, each nickel(II) ion was six-coordinated with six nitrogen atoms of two L ligands. The complex crystallizes in triclinic system, space group P 1 , a=9.764(3) A , b=11.032(3) A , c=16.402(5) A , α =80.529(6)°, β =79.180(7)°, γ =74.232(6)°, and Z =2. The title complex forms two-dimensional hydrogen bond network structures between the chlorine atoms and the nitrogens of L. The IR and UV spectroscopy were measured. The absorption bands of d–d electron transition are assigned, the values of Dq and B were calculated according to the electronic spectrum of the complex.

1D zigzag coordination polymer [Cu(tacn)(4,4′-bipy)]n·(ClO4)2n (tacn=1,4,7-triazacyclononane): structure, spectroscopic, and magnetic properties

Abstract A new one-dimensional coordination polymer, [Cu(tacn)(4,4′-bipy)]n ·(ClO4)2n (tacn = 1,4,7-triazacyclononane, 4,4′-bipy = 4,4′-bipyridine), has been synthesized and characterized by X-ray crystallography, elemental analysis, IR, electronic spectra, ESR and variable-temperature magnetic susceptibility (4–300 K). The Cu(II) ion is five-coordinated in a distorted square-pyramidal environment to three nitrogens of tacn and two nitrogens from two 4,4′-bipy ligands. Each 4,4′-bipy, in which two pyridine rings are slightly twisted, links two [Cu(tacn)]2+ units to form 1D zigzag chain. The magnetic behavior shows very weak interaction between metal ions.

Hydrothermal synthesis, structure, spectroscopic and magnetic properties of a hexanuclear cluster: [{Mn(2,2′-bipy)2}2V4O12]

Abstract The hydrothermal reaction of Mn(OAC)2·4H2O, 2,2′-bipyridine (2,2′-bipy), NH4VO3, and H3BO3 in water at 180 °C for 48 h yields the bimetallic oxide [{Mn(2,2′-bipy)2V4O12] (1) with a {V4O12} ring linked through oxo groups of adjacent vanadium sites to two {Mn(2,2′-bipy)2} moieties. It crystallizes in the Orthorhombic system, space group Ibca, a=15.985(4) A , b=16.860(4) A , c=33.561(9) A , Z=8, V=9045(4) A 3 , R1=0.0447, wR2=0.0696. Variable temperature magnetic susceptibility measurements (4–300 K) show the occurrence of a weak antiferromagnetic interaction between the manganeses (II) (J=−0.295 cm−1). No splitting corresponding to the Mn hyperfine could have been observed in the ESR spectra.

Synthesis, crystal structures and spectra properties of two new Cu(II) complexes containing thiocyanato anions as ancillary ligand

As the result of different ratio of reactants, two novel mixed–ligand complexes with different structures have been synthesised and characterised by IR and electronic spectra. In [Cu(L)(NCS)]2·0.5H2O, (L = N,N-dimethyl-N‘– (pyrid-2-ylmethyl)ethylenediamine), there are two crystallographically independent mononuclear units which are enantiomers. The thiocyanato anions act as terminal ligands. In [Cu2(L)2(μ2–NCS)2]2(ClO4)2, two thiocyanato anions bridge two Cu(II) ions in the end–to–end mode.