The homoleptic silver aryl selenolate complex [Ag-8(2,4,6-(Pr3C6H2Se)-C-i)(
8)] 1 was synthesized by the reaction of AgNO3 with an equivalent amount of
2,4,6-triisopropylbenzeneselenol (2,4,6-(Pr3C6H2SeH)-C-i) in MeCN in the p
resence of triethylamine at room temperature for 4 h. Recrystallization by
slow diffusion of CH3OH into a CH2Cl2 solution gave yellow block crystals.
The crystal structure determination indicates that the structure of the Ag8
Se8 core of complex 1 consists of a compressed distorted Ag-8 hexagonal bip
yramid embedded in a distorted rhombohedron formed by eight selenium atoms
of the aryl selenolate ligands. The cluster exhibits a strong optical limit
ing effect with threshold of 0.2 J cm(-2), which is about 2.5 times lower t
han that of C-60 in toluene under identical experimental conditions.