Syntheses, crystal structures and non-linear optical properties of two novel windmill-shaped clusters: [M2Pd4S8(dppm)2]·4DMF (M = W or Mo)

Abstract

Novel cluster compounds [M2Pd4S8(dppm)2]·4DMF (M = W 1 or Mo 2) were synthesized by the reaction of [NEt4]2[MS4] and [Pd(dppm)Cl2] (dppm = Ph2PCH2PPh2) in CH2Cl2 and CH3CN, and their crystal structures have been characterized by X-ray diffraction. Both clusters have novel new skeletal structures with eight atoms in a plane. The non-linear optical properties of 1 were studied with a 7 ns pulsed laser at 532 nm. The effective third-order non-linearities were determined yielding a2 = 1.2 × 10-6 cm W-1 M-1 and n2 = -1.5 × 10-10 cm2 W-1 M-1. Compound 1 exhibits a considerably large self-defocusing property. © The Royal Society of Chemistry 2000.