Synthesis, crystal structure and third-order nonlinear optical properties of heterometallic cluster [WM2S4(Pph3)3]·DMF (M2=1.25Ag+0.75Cu)

The heterometallic cluster [WM2S4(Pph3)3]·DMF (M2=1.25Ag+0.75Cu) 1 has been synthesized by low-temperature solid-state reaction. Single crystal X-ray analyses reveal that compound 1 possesses a linear skeleton with a W center slightly distorted from the tetrahedron. The compound was characterized by elemental analyses, IR spectra and UV-visible spectra. The third-order nonlinear optical (NLO) properties were also investigated and they exhibit nice nonlinear absorption and self-defocusing performance with modulus of the hyperpolarizability 9.8×10−30esu for 1.