title: Trinuclear and mononuclear copper(II) complexes incorporating tetradentate 2,2'-[1,1'-(ethylenedioxydinitrilo)diethylidyne]diphenol ligand: Syntheses, crystal structures, spectral and thermal behaviors.
abstract: Mononuclear and trinuclear Cu(II) complexes with chemical formula [CuL].CH3OH (1) and [{(Cu(mu-L))2(OAc)2}Cu] (2), where H2L = 2,2'-[1,1'-(ethylenedioxydinitrilo)diethylidyne]diphenol, have been synthesized and characterized by elemental analyses, 1H NMR, IR and UV-vis spectra et al. Crystallographic data of complex 1 reveal the formation of an asymmetric mononuclear structure and a slight distortion toward tetrahedral geometry from the square planar structure, in which the introduction of the non-coordinated methanol molecule lead to the assembly of the 1D chains by hydrogen bonding, Cu...pi and pi...pi interactions. Complex 2 have the elongated square pyramidal geometries for the two terminal Cu(II) ions and an octahedral coordinated geometry for the central Cu(II) ion. In complex 2, two acetate ions coordinate to three Cu(II) ions adopting a familiar syn-syn (muM-O-C-O-M) coordinated fashion. The central Cu(II) ion sits in a crystallographic inversion centre. Therefore, the whole molecule of complex 2 is rigorously centrosymmetric, and forms a 3D supramolecular networks through intermolecular C-H...O and C-H..pi interactions.
authors.affiliation: School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou 730070, PR China. dongwk@126.com
authors.forename: Wen-Kui
authors.initials: WK
authors.lastname: Dong
authors.forename: Yin-Xia
authors.initials: YX
authors.lastname: Sun
authors.forename: Xue-Ni
authors.initials: XN
authors.lastname: He
authors.forename: Jun-Feng
authors.initials: JF
authors.lastname: Tong
authors.forename: Jian-Chao
authors.initials: JC
authors.lastname: Wu
mesh_terms: D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D008024:Ligands; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry*; D010636:Phenols / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature
chemical_list: D008024:Ligands; D009942:Organometallic Compounds; D010636:Phenols; D003300:Copper