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(NO 3 ) 2 ·6H 2 O with two equivalents of PPz (PPz = piperazine hexahydrate) and two equivalents of NH 4 SCN in CH 3 OH afforded the complex [Co(NCS) 2 (PPz) 2 (CH 3 OH) 2 ]. The reaction of Ni(NO 3 ) 2 ·6H 2 O with two equivalents of PPz and four equivalents of NH 4 SCN in CH 3 OH 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 P&1bar;, a = 6.7208(6) Å, b = 8.4310(8) Å, c = 8.5923(8) Å, a = 77.881(2)°, β = 76.342(2)°, γ = 83.936(2)°, V = 461.75(1) Å 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) Å, b = 11.0231(9) Å, c = 12.317(1) Å, β = 96.642(9)°, V = 1000.9(2) Å 3 , Z = 2 with final residuals R1 = 0.0378 and wR2 = 0.0809. Important NCS—H‐N and O‐H—N(PPz) hydrogen‐bonding interactions in compound 1 and NCS···H‐N hydrogen‐bonding interactions and NCS—SCN interactions in compound 2 play a significant role in aligning the polymer strands in crystalline solids.