Second molecular hyperpolarizability of mixed transition metal, non-metal clusters

Abstract

The real and imaginary parts of third order nonlinear optical susceptibilities (χ⁽³⁾) of 10⁻⁴M solutions of [{Fe₂(CO)₆}(μ³-Y₃P){CpCr(CO)₂}] (Y=S (1) or Se (2)) and the well known precursor clusters [Fe₃(CO)₉(μ³-Y)₂] (Y=S (3) or Se (4)) in toluene were measured using Z-scan and ARINS techniques respectively. Compounds 1 and 2 possess nearly three times the γ_R values of their corresponding precursor compounds, 3 and 4. The results suggest a rich potential of mixed-metal, mixed-nonmetal class of clusters as materials exhibiting large nonlinearity.