COMPLEX-FORMATION BETWEEN CROCONATE (C5O5(2-)) AND CUIIL [L = 2,2'-BIPYRIDINE(BIPY), 2,2'/6',2'-TERPYRIDINE OR BIS(2-PYRIDYLCARBONYL)AMIDE ANION] IN DIMETHYL-SULFOXIDE SOLUTION - CRYSTAL-STRUCTURE OF [CU(BIPY) (C5O5) (H2O)]

被引:39
作者
CASTRO, I
SLETTEN, J
FAUS, J
JULVE, M
机构
[1] UNIV VALENCIA,FAC QUIM,DEPT QUIM INORGAN,DR MOLINER 50,E-46100 BURJASSOT,SPAIN
[2] UNIV BERGEN,INST KJEM,N-5007 BERGEN,NORWAY
来源
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS | 1992年 / 14期
关键词
D O I
10.1039/dt9920002271
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
A new mononuclear complex of formula [Cu(bipy)(C5O5)(H2O)] [bipy = 2,2'-bipyridine, C5O52- = dianion of croconic acid (4,5-dihydroxycyclopent-4-ene-1,2,3-trione)] has been synthesised and characterized by spectroscopic and X-ray diffraction methods. It crystallizes in the triclinic space group P1BAR, with a = 7.1016(9), b = 9.3392(9), c = 11.8911(7) angstrom, alpha = 68.939(6), beta = 84.665(7), gamma = 68.974(9)-degrees and Z = 2. The structure consists of neutral monomeric [Cu(bipy)(C5O5)(H2O)] entities. The co-ordination geometry around each copper(II) ion is distorted square pyramidal with the two nitrogen atoms of bipy and two croconate oxygen atoms in the basal plane and a water oxygen atom at the apex. The protonation of croconate and its complex formation with Cu(II)L [L = bipy, 2,2':6'2"-terpyridine or bis(2-pyridylcarbonyl)amide anion] have been investigated in dimethyl sulfoxide solution at 25-degrees-C and with 0.1 mol dm-3 tetrabutylammonium perchlorate as background electrolyte. The co-ordination modes of croconate for this system are discussed in the light of both thermodynamic and structural parameters and compared to those of the related oxalato and squarato (3,4-dihydroxycyclobut-3-ene-1,2-dionato) complexes.
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页码:2271 / 2275
页数:5
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