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Synthesis and Photophysical Properties of Au(III)–Ag(I) Aggregates

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journal contribution
posted on 17.01.2019, 17:10 by Julio Fernandez-Cestau, Raquel J. Rama, Luca Rocchigiani, Benoı̂t Bertrand, Elena Lalinde, Mikko Linnolahti, Manfred Bochmann
Cyclometalated gold­(III) complexes of the type (C∧N∧C)­AuX [HC∧N∧CH = 2,6-bis­(4-ButC6H4)­pyrazine; 2,6-bis­(4-ButC6H4)­pyridine, or 2,6-bis­(4-ButC6H4)­4-Butpyridine; X = CN, CH­(COMe)2, or CH­(CN)2] have been used as building blocks for the construction of the first family of AuIII/AgI 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 1IL­(C∧N∧C) and 3IL­(C∧N∧C) transitions dominated by the HOMO and the LUMO orbitals.

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