Co(NCS)(2)(abpt)(2) and Ni(NCS)(2)(abpt)(2) [abpt is 4-amino-3,5-bis­(pyridin-2-yl)-1,2,4-triazole]: structural characterization of polymorphs A and B

The synthesis and structures of bis­[4-amino-3,5-bis­(pyridin-2-yl)-1,2,4-triazole-κ(2) N (2),N (3)]bis­(thio­cyanato-κN)cobalt(II), [Co(NCS)(2)(C(12)H(10)N(6))(2)] or Co(NCS)(2)(abpt)(2), and bis­[4-amino-3,5-bis­(pyridin-2-yl)-1,2,4-triazole-κ(2) N (2),N (3)]bis­(thio­cyan­ato-κN)nickel(II), [Ni(NCS)(2)(C(12)H(10)N(6))(2)] or Ni(NCS)(2)(abpt)(2), are reported. In both cases, two polymorphs, A and B, were identified and structurally characterized. For both polymorphs, the structures obtained with the different metals, i.e. Co(II) or Ni(II), were found to be isostructural. All of the structures contained an intra­molecular N—H⋯N hydrogen bond, C—H⋯N inter­actions and π–π stacking inter­actions. No structural evidence was observed for a thermal spin crossover for either of the Co(NCS)(2)(abpt)(2) polymorphs between 300 (2) and 120 (2) K.