Tetrakis(imidazolyl)borate-Based Coordination Polymers: Group II Network Solids, M[B(Im)<sub>4</sub>]<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub> (M = Mg, Ca, Sr)
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We are using the coordinating anion tetrakis(imidazolyl)borate to construct new metal−organic framework structures. In this report, we present three alkaline earth metal network solids incorporating this anion. All three compounds have the same formula, M[B(Im)4]2(H2O)2 (M = Mg, Ca, Sr), and the same coordination environment about the metal. However, the three compounds have different network structures with different degrees of hydrogen bonding; the Mg material forms a two-dimensional network and the Ca and Sr compounds form one-dimensional chains. In addition, we present the structure of the protonated anion B(HIm)(Im)3 as a model for the default structure of this anion and discuss how the conformation of tetrakis(imidazolyl)borate can affect the structure of network solids.
