Poly(guanidyl)silanes as a new class of chelating, N-based ligand

The series of poly( guanidyl) silanes RnSi{hpp}(4-n) [hpp = 1,3,4,6,7,8-hexahydro-2Hpyrimido[1,2-a]pyrimidinate; R = Me, n = 1, 2; R = Ph, n - 1] have been synthesised and their coordination behaviour at copper(I) halides investigated.