The potentially pentadentate ligand 2,2′ : 6′,2″ : 6″,2‴,2â�—-quinquepyridine (L, quinquepy) forms complexes with first row transition-metal cations of 2 : 2 stoicheiometry. Crystallographic studies of the complexes [Cu2L2(O2CMe)][PF6]3·H2O and [Cu2L2][PF6]3·2MeCN reveal a double helical arrangement of the ligands about the metals.
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Barley et al. (1988) studied this question.