Helical Bipyrazole Networks Conditioned by Hydrothermal Crystallization

Abstract

AbstractAngular structure of 3,3′,5,5′‐tetramethyl‐4,4′‐bipyrazole tecton (Me4bpz) supports multiple helical strands in a series of coordination and hydrogen bonded polymers prepared using hydrothermal technique. Compounds reveal a variety of helical architectures and exist in the forms of double helicate Ag(Me4bpz)(PO2F2), two‐dimensional network formed by inter‐connection of the helices Ag2(Me4bpz)3(CF3CO2)2, interpenetrated two‐dimensional networks by interconnection of double helices Ag4(Me4bpz)5(NO3)4 · 2H2O and triple helicate formed by NH‒‒‒N hydrogen bonded bipyrazole molecules in structure Me4bpz·H2O.Coordination polymers Ag(Me4bpz)X ((X = ClO4−, CF3SO3−, C2F5CO2−) adopt simpler chain‐like structure. In all coordination compounds the bipyrazole acts as a bridging neutral group and connects two silver atoms at the distances of 9.44–9.94Å.