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Statements

Subject Item
n2:RIV%2F60461373%3A22340%2F02%3A00006952%21RIV%2F2004%2FMSM%2F223404%2FN
rdf:type
skos:Concept n16:Vysledek
dcterms:description
enthalpy has been found for systems that form 1:1 complexes by hydrogen bonding. Starting from relatively general assumptions, we havederived two forms of this relation. The first form is represented by proportionality between the solution enthalpy of the proton-donor and the chemical shift change of its active hydrogen atom. The second form is mediated by the relative extent of hydrogen bond formation , a quantity which can be directly evaluated from measurements of either the 1H NMR chemical shift orthe mixing enthalpy. The validity of both relation forms has been convincingly demonstrated for 12 systems formed by a strong proton donor (halothane [1-brom-1-chlor-2,2,2-trifluorethane] or trichloromethane) and an oxygen- or nitrogen-containing proton -acceptor (aliphatic enthalpy has been found for systems that form 1:1 complexes by hydrogen bonding. Starting from relatively general assumptions, we havederived two forms of this relation. The first form is represented by proportionality between the solution enthalpy of the proton-donor and the chemical shift change of its active hydrogen atom. The second form is mediated by the relative extent of hydrogen bond formation , a quantity which can be directly evaluated from measurements of either the 1H NMR chemical shift orthe mixing enthalpy. The validity of both relation forms has been convincingly demonstrated for 12 systems formed by a strong proton donor (halothane [1-brom-1-chlor-2,2,2-trifluorethane] or trichloromethane) and an oxygen- or nitrogen-containing proton -acceptor (aliphatic
dcterms:title
A simple relation between 1H NMR data and mixing enthalpy for systems with complex formation by hydrogen bonding A simple relation between 1H NMR data and mixing enthalpy for systems with complex formation by hydrogen bonding
skos:prefLabel
A simple relation between 1H NMR data and mixing enthalpy for systems with complex formation by hydrogen bonding A simple relation between 1H NMR data and mixing enthalpy for systems with complex formation by hydrogen bonding
skos:notation
RIV/60461373:22340/02:00006952!RIV/2004/MSM/223404/N
n5:strany
12307-12310
n5:aktivita
n15:Z
n5:aktivity
Z(MSM 223400008)
n5:cisloPeriodika
47
n5:dodaniDat
n13:2004
n5:domaciTvurceVysledku
n7:9659099 n7:8169985
n5:druhVysledku
n18:J
n5:duvernostUdaju
n17:S
n5:entitaPredkladatele
n10:predkladatel
n5:idSjednocenehoVysledku
637212
n5:idVysledku
RIV/60461373:22340/02:00006952
n5:jazykVysledku
n6:eng
n5:klicovaSlova
1H NMR; mixing enthalpy; hydrogen bonding
n5:klicoveSlovo
n8:hydrogen%20bonding n8:mixing%20enthalpy n8:1H%20NMR
n5:kodStatuVydavatele
US - Spojené státy americké
n5:kontrolniKodProRIV
[425DD162129A]
n5:nazevZdroje
Jornal of Physical Chemistry B
n5:obor
n11:CB
n5:pocetDomacichTvurcuVysledku
2
n5:pocetTvurcuVysledku
2
n5:pocetUcastnikuAkce
0
n5:pocetZahranicnichUcastnikuAkce
0
n5:rokUplatneniVysledku
n13:2002
n5:svazekPeriodika
106
n5:tvurceVysledku
Tkadlecová, Marcela Dohnal, Vladimír
n5:zamer
n14:MSM%20223400008
s:issn
1520-6106
s:numberOfPages
4
n12:organizacniJednotka
22340