Syntheses and structures of [Ag(etu)₃]₂SO₄ and [{Cu(etu)I}₃] _n (etu = ethylenethiourea): a new μ ₃–S coordination mode for etu

Abstract

2007) Syntheses and structures of [Ag(etu) 3 ] 2 SO 4 and [{Cu(etu)I} 3 ] n (etu = ethylenethiourea): a new µ 3 -S coordination mode for etu, Journal of Coordination Chemistry, 60:8, 833-841, [Ag(etu) 3 ] 2 SO 4 (1) and [{Cu(etu)I} 3 ] n (2) (etu ¼ ethylenethiourea) have been synthesized by reaction of etu with Ag 2 SO 4 or CuI and their crystal structures determined. In 1 both crystallographically independent Ag þ ions are trigonally coordinated by three monodenate etu ligands. Complex 2 is composed of a one-dimensional polymer assembled by cyclic [Cu(etu)I] 3trimers. In the [{Cu(etu)I} 3 ] n polymer, the chair-type Cu 4 S 2 I 2 core is formed by 3 -S bridging etu ligands and this represents a new coordination mode for etu. The Cu þ ions have a distorted tetrahedral coordination geometry.

Crystal Structures and Vibrational Spectroscopy of Copper(I) Thiourea Complexes

“…Chem. 2006 , 45 , 9402–9409) describes a new polymorph of CuI/etu (1:1), , together with a report of the present CuBr/etu (1:2) adduct.…”

“…A considerable number of complexes of simple copper(I) salts, formed with thiourea and its derivatives, relevant in many biological and pharmaceutical areas, , and involving a wide variety of compositions and structures, have been reported in the past; − in these, thiourea behaves as a “soft” ligand, capable of unidentate or diverse bridging modes in its complexes with copper(I) salts, associated “hard” anions usually being excluded from the coordination sphere while “soft” anions such as the heavier halide ions (i.e., not F) may be competitive. In the context of crystallization from diverse solvents, the strong hydrogen-bonding characteristics, capable of modification by substitution, may be relevant.…”