Structural and Redox Properties of Novel Spirocyclic 1-Sila-3-ferracyclobutanes, [(η5-C5H4)Fe(L2)CH2SiMe2], L2 = P−P (diphosphine)
摘要:
Photochemical treatment of the 1-dimethylsila-3-ferracyclobutane [(eta(5)-C(5)H(4)) Fe(CO)(2)CH(2)SiMe(2)] ( 1) with diphosphine ligands Ph(2)P(CH(2))(n)PPh(2), n = 1, 2, 3 (P-P), results in the formation of [(eta(5)-C(5)H(4)) Fe(P-P)CH(2)SiMe(2)] (3- 5) spirocyclic complexes. The new 1-dimethylsila-3-ferracyclobutanes do not ring-open to form polymeric materials, although the X-ray structural analysis of [(eta(5)-C(5)H(4)) Fe(Ph(2)PCH(2)CH(2)PPh(2)) CH(2)SiMe(2)] indicates the same ring strain as noted for analogues of 1 that do polymerize. Cyclic voltammetric studies of these complexes reveal a reversible one-electron redox process.