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Title
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Studies of the protonation in aqueous solution of 1-thia-4,7-diaza-cyclononane, 1-thia-4,8-diazacyclodecane and 5-thia-2,8-diazanonane
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Author
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Abstract
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| The acidbase properties of 1-thia-4,7-diazacyclononane, 1-thia-4,8-diazacyclodecane and of 5-thia-2,8-diazanonane have been investigated in aqueous solution (25 °C, 0.1 mol dm3 KNO3) by pH potentiometry, adiabatic calorimetry and 1H NMR spectroscopy. The cyclic diamines show a less effective solvation by water in the first protonation step with respect to the open-chain diamine. The presence of an internal hydrogen bond in the first protonation step of 1-thia-4,8-diazacyclodecane is evidenced. The acidbase properties of 1-thia-4,7-diazacyclononane, 1-thia-4,8-diazacyclodecane and of 5-thia-2,8-diazanonane have been investigated in aqueous solution (25 °C, 0.1 mol dm3 KNO3) by pH potentiometry, adiabatic calorimetry and 1H NMR spectroscopy. The cyclic diamines show a less effective solvation by water in the first protonation step with respect to the open-chain diamine. The presence of an internal hydrogen bond in the first protonation step of 1-thia-4,8-diazacyclodecane is evidenced. The acidbase properties of 1-thia-4,7-diazacyclononane, 1-thia-4,8-diazacyclodecane and of 5-thia-2,8-diazanonane have been investigated in aqueous solution (25 °C, 0.1 mol dm3 KNO3) by pH potentiometry, adiabatic calorimetry and 1H NMR spectroscopy. The cyclic diamines show a less effective solvation by water in the first protonation step with respect to the open-chain diamine. The presence of an internal hydrogen bond in the first protonation step of 1-thia-4,8-diazacyclodecane is evidenced. The acidbase properties of 1-thia-4,7-diazacyclononane, 1-thia-4,8-diazacyclodecane and of 5-thia-2,8-diazanonane have been investigated in aqueous solution (25 °C, 0.1 mol dm3 KNO3) by pH potentiometry, adiabatic calorimetry and 1H NMR spectroscopy. The cyclic diamines show a less effective solvation by water in the first protonation step with respect to the open-chain diamine. The presence of an internal hydrogen bond in the first protonation step of 1-thia-4,8-diazacyclodecane is evidenced. |
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Language
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English
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Source (journal)
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Journal of the Chemical Society : Dalton transactions. - London, 1972 - 1999
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Publication
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London
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Chemical Society
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1992
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ISSN
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0300-9246
[print]
2050-5671
[online]
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DOI
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10.1039/DT9920000829
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Volume/pages
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5
(1992)
, p. 829-832
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ISI
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A1992HH62500015
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Full text (Publisher's DOI)
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