Synthesis, Crystal Structures, and Nonlinear Optical Properties of Two Cubane‐Like Cluster Compounds [( n ‐Bu) 4 N] 3 [MoS 4 Ag 3 Cl 4 ] and [Et 4 N] 3 [WOS 3 Cu 3 I 4 ]

The compounds [(n‐Bu) 4 N] 3 [MoS 4 Ag 3 Cl 4 ] ( 1 ) and [Et 4 N] 3 [WOS 3 Cu 3 I 4 ] ( 2 ) were synthesized and characterized. Compound 1 crystallizes in the rhombohedral system, space group R 3 c with a = 17.194(1), b = 17.194(1), c = 39.194(3)Å, Z = 6, V = 10034.7(11)Å 3 . Compound 2 crystallizes in the rhombohedral system, space group R 3 c with a = 14.461(2), b = 14.461(2), c = 34.952(2)Å, Z = 6, V = 6329.9(13)Å 3 . The X‐ray crystallographic structure determinations show that these two cluster compounds consist of a slightly distorted cubic core. Nonlinear optical (NLO) properties of these two clusters were investigated by using Z ‐scan techniques with an 8 ns pulsed laser at 532 nm; both clusters exhibit strong nonlinear optical absorption effect (effective α 2 = 1.18 × 10 —10 m · W —1 for 1 and 1.0 × 10 —10 m · W —1 for 2 ).