Syntheses, structures and third-order nonlinear optical properties of heterometal and homometal clusters containing iron

摘要

Both the heterometal cluster {[FeMo2O10(FRA)(4)(DMF)(4)](.)2DM} (1) (FRA= alpha-furoic acid) and the homometal cluster {Fe[DTC](4)} (2) (DTC=diethyl-dithiocarbamate) were successfully synthesized by low-temperature solid-state reactions. X-ray single-crystal diffraction studies suggest that compound 1 is a hexanuclear cluster including two solvent DMF molecules, with alpha-furoic acid and DMF as auxiliary ligands, and compound 2 is a dinuclear neutral cluster. The two compounds were characterized by elemental analyses, IR spectra and UV-Vis spectra. The third-order nonlinear optical (NLO) properties of the clusters were also investigated and all exhibited nice nonlinear absorption and self-defocusing performance with moduli of the hyperpolarizabilities 1.21 x 10(-31) esu for 1 and 5.123 x 10(-31) esu for 2. (C) 2003 Elsevier Ltd. All rights reserved.