European Journal of Inorganic Chemistry

Cover image for Vol. 2014 Issue 20

Editor: Karen Hindson, Deputy Editor: Preeti Vashi

Impact Factor: 3.12

ISI Journal Citation Reports © Ranking: 2012: 11/44 (Chemistry Inorganic & Nuclear)

Online ISSN: 1099-0682

Associated Title(s): Angewandte Chemie International Edition, Chemistry - A European Journal, Chemistry – An Asian Journal, ChemistryOpen, ChemCatChem, Zeitschrift für anorganische und allgemeine Chemie

The Coordination Chemistry of 3,3'-Diamino-2,2'-bipyridine and Its Dication: Exploring the Role of the Amino Groups by X-ray Crystallography

08/2002The cover picture shows the pH-dependent coordination chemistry of the potentially ambidentate ligand 2,2'-bipyridine-3,3'-diamine. A dimeric 2:2 complex is formed with copper(II) chloride in which each copper ion is bound to two pyridine nitrogen atoms and two chloride ions in a distorted square-planar arrangement, with a long axial contact from a neighbouring amino group completing a distorted square-pyramidal geometry. Under acidic conditions, both pyridine nitrogen atoms are protonated preventing coordination to the copper(II) ion and as a consequence, the two amino groups together with four chloride ions are bound to the metal ion completing an octahedral coordination sphere. Details are discussed in the article by J. D. Wallis, M. Pilkington et al. on p. 1985 ff.