A series of heteromultimetallic complexes have been synthesized by the reaction of the dianions {p-[(CO)_3MC_5H_4C(O)]_2C_6H_4}~(2-) (M = Mo, W) with R_nSnCl_(4-n) (R = Ph, Me, Et; n = 2,3) in 1:2 or 1:1 ratio, and characterized by elemental analysis, ~1H NMR and IR spectroscopy. The electron-withdrawing groups on the cyclopentadienyl rings greatly decrease the nucleophilicity of the metallic anions. Thus, only one chlorine atom on tin compound was replaced by the metallic anion when th dianions reacted with SnR_2Cl_2. The crystal structure of [p-[(Ph_3Sn)(CO)_3MoC_5H_4C(O)]_2C_6H_4} was determined by X-ray structure analysis, which is monoclinic, space group C2/c with unit cell parameters: a = 3.4209(10) nm, b = 1.1329(3) nm, c = 1. 4214(4)nm, β = 104.466(5)°, V = 5.334(3)nm~3, Z = 4, R = 0.033. The central metal of Mo adopts a 3:4 piano stool structure, and two SnMo units are in trans- position of the bridging phenyl group.

Key words: CYCLOPENTADIENE P, TIN COMPLEX, MOLYBDENUM COMPLEX, CRYSTAL STRUCTURE, STRUCTURE CHARACTERISTICS, IR, 1HNMR