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E X 4 4QD, (,reat Uritaiii (12 V I I I 76)Summary. The crystal structurc of (1, 1'-fcrrocenediy1)diphcnylsilane Iias been determined from analysis of photographic X-ray data. The crystal system is orthorhoinbic, a = 14.18 (2)

6',2"-Terpyridine (terpy) forms octahedral complexes fa~-[ReBr(CO)~(terpy)], ~is-[W(CO)~(terpy)] and fac-[PtCIMe,(terpy)] in which the ligand oscillates between equivalent bidentate forms by a mechanism involving a 'tick-tock' twist of the metal moiety through an angle equal to the N-M-N angle of the octahedral centre and involving a seven-coordi nate metal intermediate.2,2':6' ,2"-Terpyridine (terpy) is a ligand with a very extensive coordination chemistry. I In principle, it can exhibit a variety