Mixed-anion complexes with a bipyrazolyl ligand. A new entry to a realm of three-dimensional five-connected coordination topologiesElectronic supplementary information (ESI) available: crystal structure determination and refinement details for 1–4. See http://www.rsc.org/suppdata/cc/b1/b110599j/

Abstract
Cross-linking of corrugated square grid coordination layers by anionic bridging groups generates five-connected coordination networks; the 3D topologies of mixed-anion cobalt(II) and nickel(II) complexes with a tetramethyl-substituted 4,4′-bipyrazolyl ligand are supported by μ-SO4 2− functions and exist as neutral or cationic five-connected arrays involving additional terminal (NCS) or non-coordinated (NO3 , ClO4 ) groups.

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