Water-chloride interactions: Left- and right-handed aqua-chloro supramolecular helices anchored by a chiral Schiff-base nickel complex

Both left- and right-handed supramolecular aqua-chloro helices, formed by hydrogen bonding interactions, are anchored by a new chiral Schiff-base nickel complex [NiL] in the compound [NiL] center dot 2HCl center dot 7H(2)O (1) (see scheme 1 for L); The asymmetric unit in the crystal structure of compound 1 contains fourteen non-coordinated water molecules and four hydrochloric acid molecules. All water molecules and chloride anions, present in the crystal lattice of 1, are exclusively involved in hydrogen bonding interactions. (C) 2006 Elsevier B.V. All rights reserved.