One of the three pyrazolyl groups of the scorpionato ligand occurs in the protonated form in the bright orange Cu complex [(TpCy)HCuCl2] (1) and forms a hydrogen bond with a Cu-bound Cl atom. In the reaction of [TpCyTl] with CuCl2ṁ2H2O. 1 is formed rather than the expected complex [TpCyMCl] (TpCy = [HB(cyclohexylpyrazolyl)3], R = Cy = cyclohexyl).
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Rheingold et al. (1994) studied this question.
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