Two-Dimensional Nickel Coordination Polymers: Ni(OBC)(bipyen)]·H₂O and [Ni(NDC)(bipyen)(H₂O)] (NDC = 2,6-Naphthalenedicarboxylate; OBC = 4,4'-Oxybis(benzoate); bipyen = trans-1,2-Bis(4-pyridyl)ethylene)

Hydrothermal reactions of Ni(NO₃)₂· 6H₂O with trans-1,2-bis(4-pyridyl)ethylene (bipyen), in the presence of a linear 2,6-naphthalene dicarboxylic acid (NDCH₂) and a bent 4,4'-oxybis(benzoic acid) (OBCH₂), gave a 2-D coordination polymer [Ni(NDC)(bipyen)(H₂O)] (1) and also a 2-D coordination polymer [Ni(OBC)(bipyen)]· H₂O (2), respectively. A reversible de-coordination and re-coordination of an aqua ligand was observed for polymer 1. Polymer 2 has an undulated 2-D network based on 50-membered rectangular grids, each of which has the dimension of 13.61 × 13.17 Å.

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