Microwave synthesis and crystal structures of two cobalt-4,4′-bipyridine-sulfate frameworks constructed from 1-D coordination polymers linked by hydrogen bonding

► Microwave-assisted hydrothermal synthesis yields MOFs in minutes. ► Variation of cobalt:bipyridine:sulfate:water ratio influences structural motifs. ► Coordination polymers are linked by hydrogen bonding into 3-D arrays. ► Diprotonated 4,4′-bipy acts as a template through N-H⋯O and C-H⋯O contacts.