COMPARATIVE STUDY BETWEEN N,N'-BIS (ACETYLACETONE)-O-PHENYLENEDIAMINE AND (MONOACETYLACETONE)-O-PHENYLENEDIAMINE SCHIFF BASE COMPLEXES

Co(II) , Ni(II) and Cu(II) complexes formed from the Sciff base (2Z,4Z)-4-[(2-aminophenyl)imino-]pent-2-en-2-ol , were prepared in situ and characterized on the basis of elemental analyses, magnetism, UV-vis., IR and ESR spectra . Thermal analyses of the complexes were studied in order to confirm th...

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Autores principales:	SOAYED,A MINA A, REFAAT,HEBA M
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2013
Materias:	Schiff-base IR UV-Vis. ESR TG DTA
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072013000200019
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spelling	oai:scielo:S0717-970720130002000192014-09-09COMPARATIVE STUDY BETWEEN N,N'-BIS (ACETYLACETONE)-O-PHENYLENEDIAMINE AND (MONOACETYLACETONE)-O-PHENYLENEDIAMINE SCHIFF BASE COMPLEXESSOAYED,A MINA AREFAAT,HEBA M Schiff-base IR UV-Vis. ESR TG DTA Co(II) , Ni(II) and Cu(II) complexes formed from the Sciff base (2Z,4Z)-4-[(2-aminophenyl)imino-]pent-2-en-2-ol , were prepared in situ and characterized on the basis of elemental analyses, magnetism, UV-vis., IR and ESR spectra . Thermal analyses of the complexes were studied in order to confirm the proposed structures and determine their thermal stability . Comparison between geometries, ESR and thermal studies obtained from direct condensation and in situ preparation of complexes were discussed. The in situ data show that the Schiff base form complexes with 1:1 (metal : ligand) stoichiometry with Cu(II) and Ni(II) ions compared to 2:1 (metal : ligand) formed from direct condensation between schiff base and metal ions. However, the Co(II) in situ complex formed 1:2 (metal: ligand ) stoichiometry. Square-planar geometry was suggested for the Cu(II) and Ni(II) in situ complexes, while, octahedral geometry was suggested for the Co(II) complex. The ESR spectrum of the in situ Cu(II) complex was isotropic to suggest a geometry involving grossly misaligned tetragonal axes .The thermal behavior of the complexes showed good agreement with the formulae suggested from the analytical data . Thermal decomposition of the complexes took place in several stages. The order of stability was [Cu L.(H2O)] 3H2O > NiL.H2O > CoL2.H2O. The thermodynamic parameters , energy of activation ΔEa , enthalpy of activation ΔH , order of reaction n and entropy of activation ΔS* of the complexes were calculated. All the reactions were found to be first order. The high values of activation energies reveal the high stability of these complexes.info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.58 n.2 20132013-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072013000200019en10.4067/S0717-97072013000200019
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Schiff-base IR UV-Vis. ESR TG DTA
spellingShingle	Schiff-base IR UV-Vis. ESR TG DTA SOAYED,A MINA A REFAAT,HEBA M COMPARATIVE STUDY BETWEEN N,N'-BIS (ACETYLACETONE)-O-PHENYLENEDIAMINE AND (MONOACETYLACETONE)-O-PHENYLENEDIAMINE SCHIFF BASE COMPLEXES
description	Co(II) , Ni(II) and Cu(II) complexes formed from the Sciff base (2Z,4Z)-4-[(2-aminophenyl)imino-]pent-2-en-2-ol , were prepared in situ and characterized on the basis of elemental analyses, magnetism, UV-vis., IR and ESR spectra . Thermal analyses of the complexes were studied in order to confirm the proposed structures and determine their thermal stability . Comparison between geometries, ESR and thermal studies obtained from direct condensation and in situ preparation of complexes were discussed. The in situ data show that the Schiff base form complexes with 1:1 (metal : ligand) stoichiometry with Cu(II) and Ni(II) ions compared to 2:1 (metal : ligand) formed from direct condensation between schiff base and metal ions. However, the Co(II) in situ complex formed 1:2 (metal: ligand ) stoichiometry. Square-planar geometry was suggested for the Cu(II) and Ni(II) in situ complexes, while, octahedral geometry was suggested for the Co(II) complex. The ESR spectrum of the in situ Cu(II) complex was isotropic to suggest a geometry involving grossly misaligned tetragonal axes .The thermal behavior of the complexes showed good agreement with the formulae suggested from the analytical data . Thermal decomposition of the complexes took place in several stages. The order of stability was [Cu L.(H2O)] 3H2O > NiL.H2O > CoL2.H2O. The thermodynamic parameters , energy of activation ΔEa , enthalpy of activation ΔH , order of reaction n and entropy of activation ΔS* of the complexes were calculated. All the reactions were found to be first order. The high values of activation energies reveal the high stability of these complexes.
author	SOAYED,A MINA A REFAAT,HEBA M
author_facet	SOAYED,A MINA A REFAAT,HEBA M
author_sort	SOAYED,A MINA A
title	COMPARATIVE STUDY BETWEEN N,N'-BIS (ACETYLACETONE)-O-PHENYLENEDIAMINE AND (MONOACETYLACETONE)-O-PHENYLENEDIAMINE SCHIFF BASE COMPLEXES
title_short	COMPARATIVE STUDY BETWEEN N,N'-BIS (ACETYLACETONE)-O-PHENYLENEDIAMINE AND (MONOACETYLACETONE)-O-PHENYLENEDIAMINE SCHIFF BASE COMPLEXES
title_full	COMPARATIVE STUDY BETWEEN N,N'-BIS (ACETYLACETONE)-O-PHENYLENEDIAMINE AND (MONOACETYLACETONE)-O-PHENYLENEDIAMINE SCHIFF BASE COMPLEXES
title_fullStr	COMPARATIVE STUDY BETWEEN N,N'-BIS (ACETYLACETONE)-O-PHENYLENEDIAMINE AND (MONOACETYLACETONE)-O-PHENYLENEDIAMINE SCHIFF BASE COMPLEXES
title_full_unstemmed	COMPARATIVE STUDY BETWEEN N,N'-BIS (ACETYLACETONE)-O-PHENYLENEDIAMINE AND (MONOACETYLACETONE)-O-PHENYLENEDIAMINE SCHIFF BASE COMPLEXES
title_sort	comparative study between n,n'-bis (acetylacetone)-o-phenylenediamine and (monoacetylacetone)-o-phenylenediamine schiff base complexes
publisher	Sociedad Chilena de Química
publishDate	2013
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072013000200019
work_keys_str_mv	AT soayedaminaa comparativestudybetweennnbisacetylacetoneophenylenediamineandmonoacetylacetoneophenylenediamineschiffbasecomplexes AT refaathebam comparativestudybetweennnbisacetylacetoneophenylenediamineandmonoacetylacetoneophenylenediamineschiffbasecomplexes
_version_	1718445487716040704

COMPARATIVE STUDY BETWEEN N,N'-BIS (ACETYLACETONE)-O-PHENYLENEDIAMINE AND (MONOACETYLACETONE)-O-PHENYLENEDIAMINE SCHIFF BASE COMPLEXES

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