Syntheses and structures of [Ag(etu)_3]_2SO_4 and [{Cu(etu)I}_3]_n (etu = ethylenethiourea): a new mu_3-S coordination mode for etu

摘要

[Ag(etu)_3]_2SO_4 (1) and [{Cu(etu)I}_3]_n (2) (etu = ethylenethiourea) have been synthesized by reaction of etu with Ag_2SO_4 or Cul and their crystal structures determined. In 1 both crystallographically independent Ag~+ ions are trigonally coordinated by three monodenate etu ligands. Complex 2 is composed of a one-dimensional polymer assembled by cyclic [Cu(etu)I]_3 trimers. In the [{Cu(etu)I}_3]_n polymer, the chair-type Cu_4S_2I_2core is formed by mu_3-S bridging etu ligands and this represents a new coordination mode for etu. The Cu~+ ions have a distorted tetrahedral coordination geometry.