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12 October 1998 Enhancement of the third-order susceptibility of cis-Mo(CO4 (PPh3)2 solution by oxygen in different solvents
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Detailed degenerate four wave mixing (DFWM) studies of one molybdenum complex, cis-Mo(CO)4(PPh3)2 in dichloromethane (CH2Cl2) and tetrahydrofuran (THF) are reported in this paper. Upon exposure to air/oxygen, the (chi) (3) values of CH2Cl2 and THF solutions of this complex increase dramatically with time. However, when excess free ligand is added to CH2Cl2 solution of the complex, the increase in (chi) (3) value is stopped. Hence, it is possible to obtain a CH2Cl2 solution with high (chi) (3) value by first oxidizing the solution and then adding excess ligand to stabilize the solution. For THF solution, probably due to the different mechanism causing the increase of (chi) (3) values, the increase in (chi) (3) values doesn't stop even though excess free ligand is added. Further, the increase in the (chi) (3) values of both the CH2Cl2 and THF solutions parallels the increase in the linear absorption but it is unclear whether the increased linear absorption plays any role in the increase in the (chi) (3) value of the solution. This study also shows how degenerate four wave mixing can be used as a very sensitive technique to detect the chemical change in a solution when the third order optical nonlinearities of the reactant and product are very different.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wenfang Sun, Clare C. Byeon, Michael M. McKerns, Christopher M. Lawson, J. Michael Dunn, M. Hariharasarma, and Gary M. Gray "Enhancement of the third-order susceptibility of cis-Mo(CO4 (PPh3)2 solution by oxygen in different solvents", Proc. SPIE 3472, Nonlinear Optical Liquids for Power Limiting and Imaging, (12 October 1998);

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