About: First and second ionization energies of 1,3,5-trimethylbenzene and 2,4,6-trimethylpyridine

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About: First and second ionization energies of 1,3,5-trimethylbenzene and 2,4,6-trimethylpyridine Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
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 (en)
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 (en)
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 (en)
skos:notation	RIV/61989592:15310/09:00010419!RIV10-MSM-15310___
http://linked.open...avai/riv/aktivita	Z
http://linked.open...avai/riv/aktivity	Z(AV0Z40400503), Z(AV0Z40550506), Z(MSM0021620857), Z(MSM6198959216)
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2010
http://linked.open...aciTvurceVysledku	Lemr, Karel
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Palackého v Olomouci / Přírodovědecká fakulta
http://linked.open...dnocenehoVysledku	315111
http://linked.open...ai/riv/idVysledku	RIV/61989592:15310/09:00010419
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Ionization energy; Isodesmic reactions; Jahn-Teller effect; Mass spectrometry; Synchrotron; Substituent effect; Arenes (en)
http://linked.open.../riv/klicoveSlovo	Substituent effect Arenes Ionization energy Isodesmic reactions Mass spectrometry Synchrotron Jahn-Teller effect
http://linked.open...odStatuVydavatele	CZ - Česká republika
http://linked.open...ontrolniKodProRIV	[AFAE9DE31831]
http://linked.open...i/riv/nazevZdroje	Collection of Czechoslovak Chemical Communications
http://linked.open...in/vavai/riv/obor	CF
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	6 (xsd:int)
http://linked.open...UplatneniVysledku	2009
http://linked.open...v/svazekPeriodika	74
http://linked.open...iv/tvurceVysledku	Lemr, Karel Milko, Petr Roithová, Jana Schroeder, Detlef Alcaraz, Christian Žabka, Jan
http://linked.open...n/vavai/riv/zamer	Struktura, reaktivita a dynamika molekulárních a biomolekulárních systémů: teorie, experiment, aplikace Regulace biologických procesů: Chemické modulátory vybraných systémů významných pro medicínu a zemědělství Nové molekulární systémy pro pokročilé aplikace prospěšné pro zdraví a šetrné k životnímu prostředí Modulation of signalling and regulatory pathways in normal and cancer cells
issn	0010-0765
number of pages	14 (xsd:int)
http://localhost/t...ganizacniJednotka	15310

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