Synthesis, characterisation and nonlinear optical properties of tetrahedral clusters Cp₂Mo₂ME(CO)₇, (M=Fe, Ru, Os; E=S, Se)

Abstract

A set of new chalcogen-bridged mixed metal clusters, Cp₂Mo₂M(μ₃-E)(CO)₇, (M=Fe, Ru, Os; E=S, Se) have been synthesised and characterised by IR and NMR spectroscopy, and structures of Cp₂Mo₂Ru(μ3-Se)(CO)₇ and Cp₂Mo₂Os(μ₃-Se)(CO)₇ have been established by single crystal X-ray diffraction methods. The nonlinear optical properties of these clusters were investigated through the Z-scan technique, using 35 ps laser pulses at 532 nm. We report large refractive third order nonlinearity for these clusters indicating their promise for optical limiting applications.