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|dc.title||The hexagonal prism shaped cluster W2Ag4S8(AsPh3)4: Synthesis, crystal structure, and nonlinear optical properties|
|dc.identifier.citation||Sakane, G.,Shibahare, T.,Hou, H.W.,Xin, X.Q.,Shi, S. (1995). The hexagonal prism shaped cluster W2Ag4S8(AsPh3)4: Synthesis, crystal structure, and nonlinear optical properties. Inorganic Chemistry 34 (19) : 4785-4789. ScholarBank@NUS Repository.|
|dc.description.abstract||W2S8Ag4(AsPh3)4 was prepared by gently heating the solid-state reaction mixture of (NH4)2WS4, AgBr, and AsPh3. Its structure was determined by single-crystal X-ray diffraction. The compound crystallizes in the triclinic space group P1 (No. 2), with a = 12.440(2) Å, b= 13.793(5) Å, c = 11.513(3) Å, α = 96.41(2)°, β = 108.10(2)°, γ = 93.52(2)°, V = 1853.3(9) Å3, and Z = 2; R = 0.041, Rw = 0.060. The structure can be described as a hexagonal prism shaped cage that consists of two identical butterfly shaped WS4(AgAsPh3)2 segments. These segments are interconnected by four relatively long Ag-S bonds. The electronic spectrum, cyclic voltammogram, and X-ray photoelectron spectrum of the cluster were obtained. Nonlinear optical (NLO) properties of the cluster were studied with a 7-ns pulsed laser at 532 nm. The cluster exhibits both optical self-focusing and optical nonlinear absorption (n2 eff = 5.9 × 10-17 m2 W-1; α2 eff = 2.8 × 10-9 m W-1; examined in a 1.3 × 10-4 mol dm-3 acetonitrile solution). The corresponding effective third-order NLO susceptibility (χ(3) eff) of the cluster is 1.7 × 10-10 esu. These nonlinear optical properties of the cluster are compared with those of butterfly shaped clusters and those of other known NLO materials. © 1995 American Chemical Society.|
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