In order to elucidate the preferred mode of coordination-( ) or ij6(«•)-we have reacted phosphinine (C5H5P) with the open ferrocene (2,4-Me2-7/5-C5Hj)2Fe. The product, pentakis(7i*-phosphinine)iron (1), was subjected to X-ray structural analysis: 1 crystallizes in the space group P2/n with the cell parameters a = 16.010

No abstract

The favorable EPR properties of the bis(v6-arene)metal(dS) unit make it an ideal probe in the study of weakmagnetic exchange.In this application the radicals bis(benzene)chromium (lo+) and bis(benzene)vanadium (2') are complementary, because the isotropic hyperfine coupling constants u(lH, lo+) = 0.35 mT and U (~' V , 2 ' ) = 6.3 mT cover different time ~c a l e s .~ ~~~ ~~ (IO) Eaton, S. S.; More, K. M.; Sawant, B. M.; Eaton, G. R. J. Am. Chem. Soc. 1983,105,6560. (1 1) Concerning the electronic structure of (q6-C&)2V we: (a) Cloke, F. G. N.; Dix, A. N.; Green, J. C.; Perutz, R. N.; Seddon. E. A. Organometallics 1983,2,1150 (b) Elschenbroich, Ch.; Bilger, E.; Metz, B. Organometallics 1991, 10, 2823. ( 12) For the spia-rpininteraction CrLNin in intcraandwich compounds which featurcchmocene and nickclown units ssparated by twopcvollclSir spacers, the parameter J = -1.95 cm-I has been derived: Bergerat, P.; BlUmel, J.; Fritz, M.; Hiermeier, J.; Hudeczek, P.; Kahn, 0.: Kahler, F. H. Angew. Chem., Int. Ed. EngI. 1982, 31, 1258.X-my W -h A Violet sin& crystal Of 10 (C42H4r (15) Sheldrick, 0. hi. SHELXTL-Plus.

No abstract

No abstract