OPTICAL METAL-TO-LIGAND CHARGE-TRANSFER IN ETHYL-XANTHATO(TETRACARBONYL) RHENIUM(I)

The xanthate complex Re-I(CO)(4)S2COEt was prepared and characterized by elemental analysis and various spectroscopic methods. The electroni c spectrum of this compound shows two long-wavelength absorptions whic h are assigned to intraligand pi pi (lambda(max) = 278 nm) and Re(I) --> S2COEt- MLCT (lambda(max) = 327 nm) transitions. The MLCT state is not luminescent but reactive. (C) 1998 Elsevier Science S.A.