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Coordination polymers of the {;MoO2 2+};-dihydrazone type as structurally and topologically versatile systems

Dioxomolybdenum(VI) complexes based on dihydrazone scaffolds have proved well their coordination and supramolecular prospects for the design of materials ranging from discrete multinuclear complexes to polyoxometalates.1 In contrast to their rigid benzhydrazones and carbohydrazone congeners, alkyl (di)hydrazones offer entirely new scenarios when considering materials framework topology. As we show, the extreme topological richness can be achieved by combining flexible alkyl (di)hydrazones with rigid bis(pyridyl) linkers, while relying on the coordinatively predictable MoO22+ core. A detailed structural analysis unveils that the geometrical features and topology of the polymers are dictated by the conformational flexibility of the alkyl chain of the ligand, as well as hydrogen-bonding propensities of peripheral functional groups.

molybdenum(VI) complexes ; dihydrazone ; coordination polymers

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