Issue 14, 1992

Complex formation between croconate (C5O52–) 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)]

Abstract

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 P[1 with combining macron], with a= 7.1016(9), b= 9.3392(9), c= 11.8911(7)Å, α= 68.939(6), β= 84.665(7), γ= 68.974(9)° 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 CuIIL [L = bipy, 2,2′ : 6′2″-terpyridine or bis(2-pyridylcarbonyl)amide anion] have been investigated in dimethyl sulfoxide solution at 25 °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.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1992, 2271-2275

Complex formation between croconate (C5O52–) 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)]

I. Castro, J. Sletten, J. Faus and M. Julve, J. Chem. Soc., Dalton Trans., 1992, 2271 DOI: 10.1039/DT9920002271

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