Title
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 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
Author
Faculty/Department
Faculty of Applied Engineering Sciences
Publication type
article
Publication
London ,
Subject
Chemistry
Engineering sciences. Technology
Source (journal)
Journal of the Chemical Society: Dalton transactions. - London
Volume/pages
(1992) :5 , p. 829-832
ISSN
0300-9246
1477-9226
1472-7773
ISI
A1992HH62500015
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
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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