Helical bipyrazole networks conditioned by hydrothermal crystallization

Angular structure of 3,3',5,5'-tetramethyl-4,4'-bipyrazole tecton (Me(4)bpz) 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(Me(4)bPZ)(PO2F2), two-dimensional network formed by inter-connection of the helices Ag-2(Me(4)bPZ)(3)(CF3CO2)(2), interpenetrated two-dimensional networks by interconnection of double helices Ag-4(Me(4)bPZ)(5)(NO3)(4) - 2H(2)O and triple helicate formed by NH---N hydrogen bonded bipyrazole molecules in structure Me(4)bpz-H2O. Coordination polymers Ag(Me(4)bpz)X ((X = C10(4)(-), 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 9.44-9.94 angstrom.