The alkyl chain-linked diimidazolium (or dibenzimidazolium) salts, 1, 1′-diethyl-4, 4′- tetramethylene-diimidazolium-diiodide (L1H2· I2) and 1, 1′-diethyl-3, 3′-trimethylene- dibenzimidazolium-diiodide (L2H2· I2), and their silver (I) and copper (II) coordination polymers,[L1AgI] n (1) and [L2Cu2I4] n (2), have been prepared and characterized. Complex 1 is a 1D helical polymer generated by bidentated carbene ligands (L1) and Ag (I) atoms. ...