Novel hydrogen-bond three dimensional networks generated from the reaction of metal nitrate hydrate (M = Co, Ni) with ammonium thiocynate and bidentate ligand piperazine

The reaction of Co(NO3)(2)(.)6H(2)O with two equivalents of PPz (PPz = piperazine hexahydrate) and two equivalents of NH4SCN in CH3OH afforded the complex [Co(NCS)(2)(PPz)(2)(CH3OH)(2)]. The reaction of Ni(NO3)(2)(.)6H(2)O with two equivalents of PPz and four equivalents of NH4SCN in CH3OH afforded the complex [Ni(NCS)(4)(PPZ)(2)]. Their IR spectra have been recorded and the structures have been determined. Crystal data for 1: space group P1, a = 6.7208(6) Angstrom, b = 8.4310(8) Angstrom, c = 8.5923(8) Angstrom, alpha = 77.881(2)degrees, beta = 76.342(2)degrees, gamma = 83.936(2)degrees, V = 461.75(1) Angstrom(3), Z = 1 with final residuals R1 = 0.0650 and wR2 = 0.1725. Crystal data for 2: space group P2(1)/n, a = 7.4209(6) Angstrom, b = 11.0231(9) Angstrom, c = 12.317(1) Angstrom, beta = 96.642(9)degrees, V = 1000.9(2) Angstrom(3), Z = 2 with final residuals R1 = 0.0378 and wR2 = 0.0809. Important NCS ---H-N andO-H---N(PPz) hydrogen-bonding interactions in compound 1 and (NCSH)-H-...-N hydrogen-bonding interactions and NCS---SCN interactions in compound 2 play a significant role in aligning the polymer strands in crystalline solids.