Synthesis, crystal structure and optical limiting properties of some WSeCu clusters

Abstract A nest-shaped cluster [(C 4 H 9 ) 4 N] 2 [WOSe 3 Cu 3 Br 1.67 Cl 1.33 ] ( 1 ) and a cage-shaped cluster [(C 4 H 9 ) 4 N] 3 [WSe 4 Cu 3 Br 2 Cl 2 ] ( 2 ) were synthesized and their structures were determined by single-crystal X-ray diffraction. It was found that cluster 1 showed better optical limiting properties under an 8 ns pulsed laser at 532 nm but poorer optical limiting properties under a 35 ps pulsed laser compared with its analogue [(C 4 H 9 ) 4 N] 2 [MoOS 3 Cu 3 BrCl 2 ]. The influence of the peripheral ligands of the cluster to the optical limiting properties was also discussed.