Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1443937 | Synthetic Metals | 2008 | 9 Pages |
Abstract
A series of new candidates as nonlinear optical materials, tetra-nuclear heterobimetallic clusters [MOS3M3â²Y(PPh3)3] (M = Mo, Mâ²Â = Ag, Y = Br 1; M = W, Mâ²Â = Ag, Y = I 2; M = Mo, Mâ²Â = Cu, Y = I 3; M = W, Mâ²Â = Cu, Y = I 4), have been synthesized by newly developed ligand-redistribution reaction for third-order nonlinear optical (NLO) studies. Single-crystal X-ray diffraction shows that clusters [MoX(μ3-S)3(μ3-Br)(AgPPh3)3] 1 and [WX(μ3-S)3(μ3-I)(CuPPh3)3] 4 (X = O0.5S0.51, O 4) adopt an isomorphous neutral cubane-like skeleton. Their optical nonlinearities were measured by Z-scan technique with an 8 ns pulsed laser at 532 nm. These clusters were found to exhibit effective nonlinear absorption, self-focusing effects and large optical limiting capabilities. The effective NLO susceptibilities Ï(3) and the corresponding second-order hyperpolarizabilities γ of these clusters are also reported. The influence of cluster composition on NLO properties has been discussed accordingly.
Keywords
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Biomaterials
Authors
Guodong Tang, Yuan Cao, Jinfang Zhang, Yu Zhang, Yinglin Song, Fengli Bei, Lude Lu, Chi Zhang,