In the title compound, [RuCl(C 10 H 8 N 2)(C 23 H 19 N 3 O 2)]PF 6 Á-CH 3 CN, the ligand environment about the Ru II atom is distorted octahedral, with the substituted terpyridyl ligand coordinated in a meridional fashion, the bipyridyl ligand coordinated in a cis fashion and the Cl atom trans to one of the bipyridyl N atoms. The RuN distances are in the range 2.036 (2)-2.084 (2) Å with the exception of the central RuN bond from the terpyridyl ligand, which is shorter [1.9503 (19) Å ], as expected. The pendant dimethoxyphenyl substituent is not coplanar with the terpyridyl unit; the dihedral angle between the central pyridyl ring and the benzene ring is 46.72 (11). The anion is disordered equally over two positions around an F-P-F bond axis.
Polypyridylruthenium(II) complexes with redox-active, structurally isomeric catechol or hydroquinone units were newly prepared to examine the structure-stability relationships in the redox-active sites. A marked difference based on the structure of the active site was confirmed with respect to the formation of the oxidized forms, i. e. the quinone complexes: only the para-isomer was completely converted into the corresponding quinone form. The conversion of Ru II to Ru III was not observed. Redox-mediated interconversion between the hydroquinone and para-quinone units is also reported.
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