Synthesis and Photophysical Properties of Au(III)-Ag(I) Aggregates
Résumé
Cyclometalated gold(III) complexes of the type (C∧N∧C)AuX [HC∧N∧CH = 2,6-bis(4-Bu t C6H4)pyrazine; 2,6-bis(4-Bu t C6H4)pyridine, or 2,6-bis(4-Bu t C6H4)4-Bu t pyridine; X = CN, CH(COMe)2, or CH(CN)2] have been used as building blocks for the construction of the first family of Au III /Ag I aggregates. The crystal structures of these aggregates reveal the formation of complex architectures in which the Ag + cations are stabilized by the basic centers present on each of the Au precursors. The photophysical properties of these aggregates are reported. Compared to mononuclear pincer complexes, a general red-shift and an increase in the emission intensity are observed. In agreement with DFT calculations, the lowest energy absorption and the emission are assigned to 1 IL(C∧N∧C) and 3 IL(C∧N∧C) transitions dominated by the HOMO and the LUMO orbitals.
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