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Versatile coordination behaviour of an asymmetric half-salen ligand bearing a dansyl fluorophore.
MedLine Citation:
PMID:  22858808     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The coordinative chemistry of the tridentate half-salen ligand 5-(dimethylamino)-N-(2-((2-hydroxybenzylidene)amino)phenyl)naphthalene-1-sulfonamide (H(2)L, ) has been studied by means of an electrochemical method. All of the complexes have been characterised using analytical and spectroscopic techniques. Ligand and two nickel ( and ), copper (), zinc () and cadmium () metal complexes have been studied by crystallography. Complexes and are octahedral and tetrahedral nickel(ii) complexes, respectively, and both contain an [L](2-) molecule that behaves in an [N(2)O] tridentate manner. Nickel(ii) completes its coordination kernel with three water molecules in complex , whereas in complex the nickel ion is further bound to a molecule of dansylamine arising from a hydrolysis process. The copper(ii) complex is a monomeric compound that contains a bideprotonated ligand thread and a dimethylsulfoxide molecule coordinated through the sulfur atom. The zinc complex is an unusual pentanuclear cluster compound whose structure consists of four anionic ligand units and two hydroxo anions bound to five zinc(ii) centres. The appearance of the hydroxo anions in this complex provides new evidence for water reduction electrochemically promoted by zinc metal under mild conditions. The cadmium complex is a dimeric compound that comprises two molecules of the anionic ligand and two dimethylsulfoxide molecules. The great structural variety exhibited by all these complexes demonstrates that the introduction of asymmetry in a salen skeleton by incorporating a dansyl pendant increases the versatility of the resulting ligand on coordination. All complexes are luminescent in solution at room temperature in acetonitrile solutions.
Authors:
María J Romero; Rosa Pedrido; Ana M González-Noya; Marcelino Maneiro; M Isabel Fernández-García; Guillermo Zaragoza; Manuel R Bermejo
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-2
Journal Detail:
Title:  Dalton transactions (Cambridge, England : 2003)     Volume:  -     ISSN:  1477-9234     ISO Abbreviation:  Dalton Trans     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-8-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101176026     Medline TA:  Dalton Trans     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Departamento de Química Inorgánica, Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS), Universidade de Santiago de Compostela, Santiago de Compostela, Galicia, E-15782, Spain. manuel.bermejo@usc.es.
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