Syntheses and crystal structures of three indium pyrazolyl complexes two of which contain novel bridging features

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Andrew Fraser and Brian Piggott


Abstract

The complexes [(HB(Pz*)3)In(µ-Pz*)2(µ-OH)In((Pz*)3BH)]I·2MeCN 1, [In(HB(Pz*)3)I2(HPz*)]·0.5C6H12 2, and [In2(Pz**)4I2ONa2(THF)2] 3, where HPz* is 3,5-dimethylpyrazole and HPz** is 3,5-di-tert-butylpyrazole, have been prepared and their crystal structures determined. The presence in 1 of bridging Pz* and in 2 of monodentate HPz* given that this was not a starting material is attributed to the moisture sensitivity of tris(pyrazolyl)borates. The indium ions in 1 are bridged by two Pz* groups and an hydroxide ion, whereas in 3 the only bridge directly between the indium ions is an oxygen dianion. The four-co-ordinate donor set of the indium ion in 3 is formed by the bridging oxygen dianion, an iodide ion and the nitrogens of two Pz** groups. The remaining nitrogens of the Pz** co-ordinate to a sodium ion, which itself effectively bridges Pz** groups on adjacent indium ions.


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