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(Acetato-kappaO)aqua(1H-imidazole-kappaN3)(picolinato-kappa2N,O)copper(II) 0.87-hydrate: a Z' > 1 structure.
MedLine Citation:
PMID:  19652309     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
The crystal structure of the title compound, [Cu(C6H4NO2)(C2H3O2)(C3H4N2)(H2O)].0.87H2O, has a square-pyramidal-coordinated Cu(II) centre (the imidazole is trans to the picolinate N atom, the acetate is trans to the picolinate -CO2 group and the aqua ligand is in a Jahn-Teller-elongated apical position) and has two symmetry-independent molecules in the unit cell (Z' = 2), which are connected through complementary imidazole-picolinate N-H...O hydrogen bonding. The two partially occupied solvent water molecules are each disordered over two positions. The disordered solvent water molecules, together with pseudosymmetry elements, support the notion that a crystal structure with multiple identical chemical formula units in the structural asymmetric unit (Z' > 1) can represent a crystal 'on the way', that is, a kinetic intermediate form which has not yet reached its thermodynamic minimum. Neighbouring molecules form pi-pi stacks between their imidazole and picolinate N-heterocycles, with centroid-centroid distances in the range 3.582 (2)-3.764 (2) A.
Authors:
Anne-Christine Chamayou; Chaitali Biswas; Ashutosh Ghosh; Christoph Janiak
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Publication Detail:
Type:  Journal Article     Date:  2009-07-25
Journal Detail:
Title:  Acta crystallographica. Section C, Crystal structure communications     Volume:  65     ISSN:  1600-5759     ISO Abbreviation:  Acta Crystallogr C     Publication Date:  2009 Aug 
Date Detail:
Created Date:  2009-08-04     Completed Date:  2009-09-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8305826     Medline TA:  Acta Crystallogr C     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  m311-3     Citation Subset:  -    
Affiliation:
Institut für Anorganische und Analytische Chemie, Universität Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany.
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