Abstract
The nonlinear absorption and refraction of the clusters [MoS4Cu4Br2(py)6] and [Et4N]2[MoS4Cu4(SCN)4(2-pic)4] have been investigated using the z-scan technique with a ns laser at 532 nm wavelength. They have the same planar ‘open’ structures and the same skeleton metal atoms; the only difference is that the former has halogen ligands while the latter possesses pseudo-halogen groups – SCN – as ligands. Alteration of nonlinear refractive index and enhancement of nonlinear absorption were found in these two clusters. A steady state model of excited state nonlinear refraction was proposed to explain this phenomenon.
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