1D coordination polymers of silver(I) and copper(II) based on bis(N-heterocyclic carbene) ligands: Synthesis and structural studies
摘要:
The alkyl chain-linked diimidazolium (or dibenzimidazolium) salts, 1,1'-diethyl-4,4'-tetramethylene-diimidazolium-diiodide ((LH2)-H-1.I-2) and 1,1'-diethy1-3,3'-trimethylene-dibenzimidazolium-diiodide ((LH2)-H-2.I-2), and their silver(I) and copper(II) coordination polymers, [L(1)Agl](n) (1) and [(LCu2I4)-Cu-2](n) (2), have been prepared and characterized. Complex 1 is a 1D helical polymer generated by bidentated carbene ligands (L-1) and Ag(I) atoms. The 1D polymer of 2 is formed by bidentated carbene ligands (L-2) and coplanar quadrilateral Cu2I2 units. 3D supramolecular frameworks in the crystal packings of 1 and 2 are formed via intermolecular weak interactions, including C-H center dot center dot center dot pi contacts, pi-pi interactions and C-H center dot center dot center dot I hydrogen bonds. (C) 2010 Elsevier Ltd. All rights reserved.