Molecular helicity in inorganic complexes: double helical binuclear complexes of 2,2′ : 6′,2″ : 6″,2‴ : 6‴,2â —-quinquepyridine (L): crystal structures of [Cu2L2(O2CMe)][PF6]3·H2O and [Cu2L2][PF6]3·2MeCN

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Abstract
The potentially pentadentate ligand 2,2'':6'',2'''':6'''',2'''''',2''''''''-quinquepyridine (L, quinquepy) forms complexes with first row transition-metal cations of 2:2 stoicheiometry. Crystallographic studies of the complexes [Cu2L2(O2CMe)] [PF6]3 .cntdot. H2O and [Cu2L2] [PF6]3 .cntdot. 2MeCN reveal a double helical arrangement of the ligands about the metals.