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Anion-Directed Self-Assembly in Coordination Networks: Architectural Control via Cooperative Noncovalent Interactions

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posted on 20.12.2010, 00:00 by Behrouz Notash, Nasser Safari, Hamid Reza Khavasi
The self-assembly of a new flexible tritopic pyrazine−pyridine ligand (pz-3-py) with HgX2 (X = Cl, Br) was investigated. The results show that coordinated chloride and bromide anions play different roles, and two architecturally different coordination polymers were obtained with the anions used. Where X = Cl, in [Hg(μ3-pz-3-py)Cl2]n (1), the 2D network is isolated, while for X = Br, in [Hg(μ-pz-3-py)Br2]n (2), a 1D zigzag chain is constructed. Our results show that noncovalent interactions such as hydrogen bond, halogen···halogen, and halogen···π interactions, when acting cooperatively, are driving forces for the selection of different structures.