Network structures with 2,2′-bipyridine-3,3′diol: a discrete Co(III) complex that forms a porous 3-D hydrogen bonded network, and Cu(<scp>ii</scp>) coordination chains

The complex [Co(bpydiol-H)3]&#183;H2O, where bpydiol is 2,2′-bipyridine-3,3′-diol, features a simple octahedral tris-chelate complex that forms a honeycomb-like six-connected 3-D network of 4966 topology through weak C–H⋯O hydrogen bonding. The network shows significant channels and the material is remarkably robust. The water guest molecules can be solvent exchanged for 1,2-dibromobenzene molecules. Cu(II) complexes of bpydiol are also reported: [Cu(bpydiol-H)X], where X = Cl−, Br−, or NO3−, which all have coordination chain structures. The coordination chains in [Cu(bpydiol-H)(NO3)] assemble through weak CH..ONO2 hydrogen bonds to form a corrugated 2-D network.