“…This asymmetry is also caused by the interruption of the ~-conjugation in the hp ligand that enhances the isoindole nitrogen basicity (Bossa, Cauletti, Grandinetti & Nota, 1987;Hiller, Strahle, Datz, Hanack, Hatfield, ter Haar & Gutlich, 1984). Moreover, such an interpretation is supported by: (i) the short C(6)---N(4) [1.286 (8) (Iimura, Sakurai & Yamamoto, 1988); (iii) the ConI--N(pyridine) distance, much longer than the normal value of 1.91 (1)A, found for example in [(r/5-CsHs)ColNCsH4--C(CH3~N -CH(CH3)(C6Hs)]+.I - (Bernal, Riesner, Brunner & Riepl, 1985).…”