Journal of the Chemical Society, Dalton Transactions p. 1829 - 1834 (1996)
Update date:2022-07-30
Topics:
Ho, Paul Kwok-Keung
Peng, Shie-Ming
Wong, Kwok-Yin
Che, Chi-Ming
New polypyridines [1,3-bis(2,2′:6′,2″-terpyridin-6-yl)benzene L1 and 1,3-bis[4-(4-tert-butylphenyl)-2,2′:6′,2″-terpyridin-6-yl) benzene] L2 were prepared. Their reactions with copper(II) acetate and silver(I) acetate gave [Cu2L12]4+, [Cu2L22]4+, [Ag2L12]2+ and [Ag2L22]2+ while [Ru2L2(terpy)2]4+ was obtained from [Ru(terpy)Cl3] (terpy = 2,2′:6′,2″-terpyridine) with L2. The complexes [Cu2L22][PF6] 4·6MeCN and [Ag2L22][PF6]·Me 2CO have been established by X-ray crystal analyses to have double helical structures. Electrospray mass spectrometry showed that the double helical [Cu2L22]4+ and [Ag2L12]2+ complexes and the single helical [Ru2L2(terpy)2]4+ complex are the only species present in solutions. All five complexes undergo reversible oxidations or reductions. Interestingly, the electrochemical data indicate substantial electronic coupling within the bimetallic double helical [M2L2]3+ (M = Cu or Ag, L = L1 and L2) but not the single helical [Ru2L2(terpy)2]4+ systems.
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