2,2′:6′,2″:6″2‴:6‴,2â�—-Quinquepyridine (qpy) forms a binuclear complex [(tpy)Ru(qpy)Ru(tpy)Cl][PF6]3(tpy = 2,2′:6′,2″-terpyridine) which has been structurally characterised and shown t o possess a helical structure with two six-co-ordinate ruthenium centres bridged by the qpy ligand; the complex is electrochemically active, but there are no significant interactions between the two metal centres.
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Cathey et al. (1990) studied this question.
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