STRUCTURES AND MOSSBAUER-SPECTRA OF PHOSPHIDO-BRIDGED HETEROBIMETALLIC COMPLEXES CPFE(CO)(2)(MU-PPH(2))W(CO)(5) AND CPFE(CO)(MU-CO)(MU-PPH(2))W(CO)(4)

Structures of non metal-metal bonded phosphido-bridged heterobimetallic complexes, including CpFe(CO)(2)(mu-PPh(2))W(CO)(5) (1-W) and metal-metal bonded CpFe(CO)(mu-CO)(mu-PPh(2))W(CO)(4) (2), were determined by a single crystal X-ray diffraction study. In 1-W, the long distance between Fe and W indicates no metal-metal bond to exist. In 2, a Fe-W bond with bond length 2.851 Angstrom and a semibridging carbonyl with W-C-O angle 153 degrees were observed. Mossbauer spectra of 1-W and 2 were taken at 77 K. Isomer shifts of 1-W and 2 were - 0.0203 mm s(-1) and 0.1917 mm s(-1) respectively.