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Remarkably Stable Porous Assembly of Nanorods Derived from a Simple Metal−Organic Framework

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posted on 07.02.2007, 00:00 by D. Krishna Kumar, Amitava Das, Parthasarathi Dastidar
A new strategy has been described to create a microporous metal−organic framework by assembling nanorodlike constructs equipped with a complementary hydrogen-bonding surface. Guest-accessible channels are located in the internanorod space generated by the self-assembly of the nanorodlike constructs via complementary hydrogen bonding. Thus, reaction of a hydrogen-bond-equipped and conformationally flexible ligand such as N,N‘-bis(3-pyridyl)urea with CuSO4 resulted in the formation of a stable, guest-free microporous MOF wherein a nanorodlike construct is formed that is further self-assembled into a microporous metal−organic framework via self-complementary hydrogen bonding involving a urea backbone and sulfate anion. Because of conformational flexibility, a one-dimensional zigzag coordination polymeric network is also formed. The structures are characterized mainly by single-crystal X-ray diffraction techniques.