Influence of cluster composition on NLO properties of neutral cubane-like heterothiometallic clusters |
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| Authors: | Guodong Tang Yuan Cao Jinfang Zhang Yu Zhang Yinglin Song Fengli Bei Lude Lu Chi Zhang |
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| Affiliation: | 1. Research Center for Advanced Molecular Materials, School of Chemistry and Chemical Engineering, Scientific Research Academy, Jiangsu University, Zhenjiang 212013, PR China;2. Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials, Department of Chemistry, Huaiyin Teachers College, Huaian 223001, PR China;3. Institute of Molecular Engineering and Advanced Materials, School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China;4. School of Physical Science and Technology, Suzhou University, Suzhou 215006, PR China |
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| Abstract: | A series of new candidates as nonlinear optical materials, tetra-nuclear heterobimetallic clusters MOS3M3′Y(PPh3)3] (M = Mo, M′ = Ag, Y = Br 1; M = W, M′ = Ag, Y = I 2; M = Mo, M′ = Cu, Y = I 3; M = W, M′ = 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 χ(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. |
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| Keywords: | Neutral cubane-like clusters Cluster composition Nonlinear optical properties |
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