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Statements

Subject Item
n2:RIV%2F61989592%3A15310%2F09%3A00010419%21RIV10-MSM-15310___
rdf:type
n14:Vysledek skos:Concept
dcterms:description
The first and second ionization energies of trimethyl substituted analogs of benzene and pyridine are determined by means of mass spectrometry in conjunction with synchrotron radiation. The first ionization energy of 1,3,5-trimethylbenzene amounts to (8.38 +/- 0.05) eV and the second ionization energy to (22.8 +/- 0.1) eV. The first ionization energy of 2,4,6-trimethylpyridine is determined as (8.65 +/- 0.05) eV and the second ionization energy as (23.0 +/- 0.1) eV. The ionization energies are compared with those of unsubstituted benzene and pyridine and the effects of the methyl groups are evaluated by means of isodesmic reactions. As expected, it is found that the electron-donating effect of the methyl groups stabilizes neutral pyridine and doubly charged pyridine more than neutral benzene and doubly charged benzene, respectively. Surprisingly, the opposite effect is found for the radical cations, which is ascribed to the unfavorable degenerate electronic structure of benzene radical-cation, which d The first and second ionization energies of trimethyl substituted analogs of benzene and pyridine are determined by means of mass spectrometry in conjunction with synchrotron radiation. The first ionization energy of 1,3,5-trimethylbenzene amounts to (8.38 +/- 0.05) eV and the second ionization energy to (22.8 +/- 0.1) eV. The first ionization energy of 2,4,6-trimethylpyridine is determined as (8.65 +/- 0.05) eV and the second ionization energy as (23.0 +/- 0.1) eV. The ionization energies are compared with those of unsubstituted benzene and pyridine and the effects of the methyl groups are evaluated by means of isodesmic reactions. As expected, it is found that the electron-donating effect of the methyl groups stabilizes neutral pyridine and doubly charged pyridine more than neutral benzene and doubly charged benzene, respectively. Surprisingly, the opposite effect is found for the radical cations, which is ascribed to the unfavorable degenerate electronic structure of benzene radical-cation, which d
dcterms:title
First and second ionization energies of 1,3,5-trimethylbenzene and 2,4,6-trimethylpyridine First and second ionization energies of 1,3,5-trimethylbenzene and 2,4,6-trimethylpyridine
skos:prefLabel
First and second ionization energies of 1,3,5-trimethylbenzene and 2,4,6-trimethylpyridine First and second ionization energies of 1,3,5-trimethylbenzene and 2,4,6-trimethylpyridine
skos:notation
RIV/61989592:15310/09:00010419!RIV10-MSM-15310___
n3:aktivita
n17:Z
n3:aktivity
Z(AV0Z40400503), Z(AV0Z40550506), Z(MSM0021620857), Z(MSM6198959216)
n3:cisloPeriodika
1
n3:dodaniDat
n7:2010
n3:domaciTvurceVysledku
n4:4316851
n3:druhVysledku
n5:J
n3:duvernostUdaju
n15:S
n3:entitaPredkladatele
n18:predkladatel
n3:idSjednocenehoVysledku
315111
n3:idVysledku
RIV/61989592:15310/09:00010419
n3:jazykVysledku
n9:eng
n3:klicovaSlova
Ionization energy; Isodesmic reactions; Jahn-Teller effect; Mass spectrometry; Synchrotron; Substituent effect; Arenes
n3:klicoveSlovo
n10:Substituent%20effect n10:Arenes n10:Synchrotron n10:Jahn-Teller%20effect n10:Mass%20spectrometry n10:Ionization%20energy n10:Isodesmic%20reactions
n3:kodStatuVydavatele
CZ - Česká republika
n3:kontrolniKodProRIV
[AFAE9DE31831]
n3:nazevZdroje
Collection of Czechoslovak Chemical Communications
n3:obor
n11:CF
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
6
n3:rokUplatneniVysledku
n7:2009
n3:svazekPeriodika
74
n3:tvurceVysledku
Lemr, Karel Milko, Petr Roithová, Jana Schroeder, Detlef Alcaraz, Christian Žabka, Jan
n3:zamer
n16:MSM6198959216 n16:AV0Z40550506 n16:AV0Z40400503 n16:MSM0021620857
s:issn
0010-0765
s:numberOfPages
14
n13:organizacniJednotka
15310