ZIRCONA[1]METALLOCYCLOPHANES - SYNTHESIS, PROPERTIES, AND STRUCTURE OF (TBU-ETA(5)-C5H4)(2)ZR(ETA(1)-1,ETA(1)-1')(ETA(6)-C6H5)(2)V AND ITS CHROMIUM ANALOG

The tilt caused by the one-atom interannular bridge in a zirconocene unit in 7 imposed at bis(eta(6)-benzene)vanadium (3(.)) is very small. As judged from EPR spectroscopy, the electronic structure of 3(.) is virtually unaffected by zircona[1]vanadocyclophane formation. The novel binuclear complexes are very robust thermally but quite labile chemically. The latter property precludes a thorough electrochemical study of metal-metal interaction in 7(.).