Anion directed assembly of a dinuclear double helicateElectronic supplementary information (ESI) available: Fig. S1: stereoviews showing the packing of 1 in the solid state. Fig. S2: partial 1H NMR spectra of L2 and 1 and their assignment. See http://www.rsc.org/suppdata/cc/b1/b106981k/

Abstract
The synthesis and structural characterisation of the diamino-bis-pyridine ligand L2 and its diammonium-bis-pyridinium salt [(H4L2Cl)2]·6Cl·H2 O 1, are reported; X-ray diffraction studies reveal that chloride coordination causes the latter to adopt a double-helicate structure in the solid-state.

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