Keywords: Enzyme models / N,O ligands / Transition metals / Tripodal ligandsThe thallium(I) salts of tris(pyrazolyl)methanesulfonate (Tpms) and tris(3-tert-butylpyrazolyl)methanesulfonate (Tpms tBu ) have been used to prepare the following complexes:
and [(Tpms)Cu(CO)] (6b). The solid-state structures of 1b, 2a, 3, and 5b have been determined by X-ray analysis. The optical spectra of 2a and 3 were investigated by means of the angular overlap model to elucidate their electronic structures in view of the underlying molecular geometries. Variable-temperature NMR and IR spectroscopic studies show that Tpms and Tpms tBu can act
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