The absorption and emission spectra of GeC13-, SnC13-, PbC13-, and PbC142- in acetonitrile were recorded. In, emission quantum yields and lifetimes were determined. The emitting excited states are of the metalcentered type and originate from the 3P state of the free s2 ions. It is suggested that the complex ions which have-pyramidal C3” (MC13-) and seesaw C2, (PbC1d2-) structures in the ground state rearrange toward trigonalplanar3h and tetrahedral Td geometries, respectively, in their sp excited states.
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Nikol et al. (1992) studied this question.