Polymeric topologies in cadmium(II) dithiophosphate adducts of the isomeric n-pyridinealdazines, n = 2, 3 and 4

Abstract

A series of crystal structures of adducts formed between cadmium dithiophosphate, Cd(S2P(OiPr)2)2, and the isomeric n-pyridinealdazine ligands, n = 2, 3, and 4, are described. A centrosymmetric dimer is found in the 2:1 adduct with the 2-isomer, i.e. [Cd(S2P(OiPr)2)2(2-NC5H 4C(H)=C(H)C5H4N-2)0.5]2, in which the cadmium atom exists within a cis-N2S4 donor set and the di-pyridyl-type ligand is tetradentate. By contrast, trans-N 2S4 donor sets for cadmium and regular bridging modes of coordination lead to polymers with a step-ladder topology are found in the 1:1 adducts with the 3-and 4-isomeric ligands, i.e. [Cd(S2P(OiPr) 2)2(n-NC5H4C(H)=C(H)C 5H4N-n)]∞, for n = 3 and 4. Differences in aggregation behaviour are related to the binding requirements of the n-pyridinealdazine ligands. © by Oldenbourg Wissenschaftsverlag.