The spectrophotometric determination of the pka of pyrrolidinedithiocarbamic and piperidinedithiocarbamic acids, based on diode array measurements

Detalhes bibliográficos
Autor(a) principal: Cavalheiro,Éder T.G.
Data de Publicação: 1997
Outros Autores: Chierice,Gilberto O.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Journal of the Brazilian Chemical Society (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531997000100010
Resumo: A spectrophotometric method, based on the use of a diode array spectrophotometer, is proposed in order to determine the pKa of pyrrolidinedithiocarbamic (HPyr-I) and piperidinodithiocarbamic (HPip-II) acids. The high speed of data acquisition of the equipment made it possible to minimize the problem of acid decomposition. The values obtained were 3.10(I) and 3.51(II) in I = 0.50 mol L-1 (NaClO4) at 25.0 °C, and are consistent with the acid decomposition mechanism. A discussion is presented based on the shape of the compound spectra in acidic and basic media and their relation to the order of the pKa values for I and II.
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spelling The spectrophotometric determination of the pka of pyrrolidinedithiocarbamic and piperidinedithiocarbamic acids, based on diode array measurementspiperidinedithiocarbamic acidpyrrolidinedithiocarbamic acidpKa determinationA spectrophotometric method, based on the use of a diode array spectrophotometer, is proposed in order to determine the pKa of pyrrolidinedithiocarbamic (HPyr-I) and piperidinodithiocarbamic (HPip-II) acids. The high speed of data acquisition of the equipment made it possible to minimize the problem of acid decomposition. The values obtained were 3.10(I) and 3.51(II) in I = 0.50 mol L-1 (NaClO4) at 25.0 °C, and are consistent with the acid decomposition mechanism. A discussion is presented based on the shape of the compound spectra in acidic and basic media and their relation to the order of the pKa values for I and II.Sociedade Brasileira de Química1997-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531997000100010Journal of the Brazilian Chemical Society v.8 n.1 1997reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50531997000100010info:eu-repo/semantics/openAccessCavalheiro,Éder T.G.Chierice,Gilberto O.eng2011-10-04T00:00:00Zoai:scielo:S0103-50531997000100010Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2011-10-04T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv The spectrophotometric determination of the pka of pyrrolidinedithiocarbamic and piperidinedithiocarbamic acids, based on diode array measurements
title The spectrophotometric determination of the pka of pyrrolidinedithiocarbamic and piperidinedithiocarbamic acids, based on diode array measurements
spellingShingle The spectrophotometric determination of the pka of pyrrolidinedithiocarbamic and piperidinedithiocarbamic acids, based on diode array measurements
Cavalheiro,Éder T.G.
piperidinedithiocarbamic acid
pyrrolidinedithiocarbamic acid
pKa determination
title_short The spectrophotometric determination of the pka of pyrrolidinedithiocarbamic and piperidinedithiocarbamic acids, based on diode array measurements
title_full The spectrophotometric determination of the pka of pyrrolidinedithiocarbamic and piperidinedithiocarbamic acids, based on diode array measurements
title_fullStr The spectrophotometric determination of the pka of pyrrolidinedithiocarbamic and piperidinedithiocarbamic acids, based on diode array measurements
title_full_unstemmed The spectrophotometric determination of the pka of pyrrolidinedithiocarbamic and piperidinedithiocarbamic acids, based on diode array measurements
title_sort The spectrophotometric determination of the pka of pyrrolidinedithiocarbamic and piperidinedithiocarbamic acids, based on diode array measurements
author Cavalheiro,Éder T.G.
author_facet Cavalheiro,Éder T.G.
Chierice,Gilberto O.
author_role author
author2 Chierice,Gilberto O.
author2_role author
dc.contributor.author.fl_str_mv Cavalheiro,Éder T.G.
Chierice,Gilberto O.
dc.subject.por.fl_str_mv piperidinedithiocarbamic acid
pyrrolidinedithiocarbamic acid
pKa determination
topic piperidinedithiocarbamic acid
pyrrolidinedithiocarbamic acid
pKa determination
description A spectrophotometric method, based on the use of a diode array spectrophotometer, is proposed in order to determine the pKa of pyrrolidinedithiocarbamic (HPyr-I) and piperidinodithiocarbamic (HPip-II) acids. The high speed of data acquisition of the equipment made it possible to minimize the problem of acid decomposition. The values obtained were 3.10(I) and 3.51(II) in I = 0.50 mol L-1 (NaClO4) at 25.0 °C, and are consistent with the acid decomposition mechanism. A discussion is presented based on the shape of the compound spectra in acidic and basic media and their relation to the order of the pKa values for I and II.
publishDate 1997
dc.date.none.fl_str_mv 1997-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531997000100010
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531997000100010
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0103-50531997000100010
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Química
publisher.none.fl_str_mv Sociedade Brasileira de Química
dc.source.none.fl_str_mv Journal of the Brazilian Chemical Society v.8 n.1 1997
reponame:Journal of the Brazilian Chemical Society (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
instacron_str SBQ
institution SBQ
reponame_str Journal of the Brazilian Chemical Society (Online)
collection Journal of the Brazilian Chemical Society (Online)
repository.name.fl_str_mv Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)
repository.mail.fl_str_mv ||office@jbcs.sbq.org.br
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