Abstract
1,3,4,6,7,8-Hexahydro-2 H-pyrimido[1,2- a]pyrimidine (hppH) reacts with copper(I) cyanide to afford the polymeric chain [(hppH)CuCN] ∞ ( 1), consisting of distorted trigonal planar copper atoms linked by cyanide bridges. Attempts to isolate molecular species by repeating the reaction in the presence of triphenylphosphine gave a dimeric complex of the general formula [Cu 2(CN) 2(PPh 3) 4(hppH)] ( 2). The solid-state structure of 2 is consistent with a zwitterionic complex, comprising of [Cu (+)(PPh 3) 2(hppH)] and [Cu (−)(CN) 2(PPh 3) 2] metal centres, linked by a cyanide bridge. Variable temperature NMR studies suggest that the formation of higher oligomers may occur in solution at low temperature.
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