Linked Life Data

20061181

Source:http://linkedlifedata.com/resource/pubmed/id/20061181

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2010-2-17
pubmed:abstractText
Charge-transfer (CT) complexes formed from the reactions of 4-nitropyrocatechol (4-nCat) as an electron acceptor with four amino alcohols: 2-aminoethanol, 1-amino-2-propanol, 4-aminobutanol and N-(2-hydroxyethyl)-1,3-diaminopropane (NHEDAP) as electron donors, have been studied spectrophotometrically in H(2)O and H(2)O/EtOH at 20, 25, 30, 35 and 40 degrees C. The calculated values of the oscillator strength and transition moment confirm the formation of CT-complexes. The thermodynamic and spectroscopic parameters were also evaluated for the formation of CT-complexes. The equilibrium constants ranged from 9.00 to 2.20 l mol(-1) (M(-1)). These interactions are exothermic and have relatively large standard enthalpy and entropy changes (DeltaH values ranged from -15.58 to -3.10 kJ mol(-1); DeltaS ranged from 26.81 to -3.25 J K(-1)mol(-1)). The solid CT-complexes have been synthesized and characterized by IR, NMR, mass spectrometry and thermal analysis. The photometric titration curves and other spectrometric data for the reactions indicated that the data obtained refer to the formation of 1:1 charge-transfer complex of [(4-nCat) (NHEDAP)] and 1:2 charge-transfer complexes of other amino alcohols [(4-nCat) (amino alcohol)(2)]. The effect of alkali and alkaline earth metals on increasing the equilibrium constant of the CT-complexation was also investigated.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
1873-3557
pubmed:author
pubmed:copyrightInfo
Copyright 2009 Elsevier B.V. All rights reserved.
pubmed:issnType
Electronic
pubmed:volume
75
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
970-7
pubmed:meshHeading
pubmed:year
2010
pubmed:articleTitle
Charge-transfer complexes of 4-nitrocatechol with some amino alcohols.
pubmed:affiliation
Department of Chemistry, Sharif University of Technology, Tehran, Iran.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't