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The Coordination Chemistry of 3,3′‐Diamino‐2,2′‐bipyridine and Its Dication: Exploring the Role of the Amino Groups by X‐ray Crystallography
Author(s) -
Rice Craig R.,
Onions Stuart,
Vidal Natalia,
Wallis John D.,
Senna MariaCristina,
Pilkington Melanie,
StoeckliEvans Helen
Publication year - 2002
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200208)2002:8<1889::aid-ejic1889>3.0.co;2-z
Subject(s) - chemistry , dication , crystallography , pyridine , octahedron , protonation , copper , ligand (biochemistry) , ion , coordination sphere , coordination complex , chloride , bipyridine , coordination geometry , square antiprism , square pyramidal molecular geometry , coordination number , diamine , crystal structure , inorganic chemistry , metal , molecule , medicinal chemistry , polymer chemistry , organic chemistry , hydrogen bond , lanthanide , biochemistry , receptor
The 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.