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The reaction of Zn(NO 3 ) 2 .6H 2 O with PPz hexahydrate (PPz=piperazine) and NH 4 SCN in CH 3 OH afforded the complex [Zn(NCS) 2 (PPz)] n (1). The reaction of CoCl 2 .6H 2 O with PPz in CH 3 OH afforded the complex [CoCl 2 (PPz)] n (2). The PPz ligand in 1 is coordinated to the metal centers through both nitrogen atoms to form a 1-D zigzag-chain structure and the distorted tetrahedral coordination geometry at each zinc center is completed by a pair of N-bonded thiocyanate ligands. Compound 2 has an analogous 1-D zigzag-chain structure containing terminal chloro ligands. Important NCS...H N hydrogen-bonding interactions in compound 1 and N H...Cl M and C H...Cl M hydrogen-bonding interactions in compound 2 play a significant role in aligning the polymer strands in the crystalline solid.
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