Synthesis and crystal structures of ZnCl2 and CdCl2 containing helical coordination polymers derived from a flexible bis(pyridylurea) ligand

Add time:08/07/2019    Source:sciencedirect.com

A flexible bis(pyridylurea) ligand, 1,1′-[oxybis(2,1-phenylene)] bis(3-pyridin-3-ylurea) (L), has been synthesized and characterized. The interaction of L with ZnCl2 and CdCl2 has been investigated. In the structure of {[ZnLCl2]·2DMF}n (1), the flexible ligands bridge the ZnII centers to form 1D helical chains with a pitch of 9.743 Å. The P and M helical chains are arranged equally, and the whole complex 1 is racemic. In the structure of [CdLCl2(DMF)]n (2), the flexible ligands bridge CdII centers to form one-dimensional P and M helical chain structures in a similar manner. Then the chlorine atoms act as bridges in bidentate modes linking the P helical chain with M helical chain to form a 1D looped chain coordination polymer.

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