Electronic Transitions in Conformationally Controlled Tetrasilanes with a Wide Range of SiSiSiSi Dihedral Angles

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388963%3A_____%2F14%3A00431050" target="_blank" >RIV/61388963:_____/14:00431050 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1002/chem.201403495" target="_blank" >http://dx.doi.org/10.1002/chem.201403495</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/chem.201403495" target="_blank" >10.1002/chem.201403495</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Electronic Transitions in Conformationally Controlled Tetrasilanes with a Wide Range of SiSiSiSi Dihedral Angles

Popis výsledku v původním jazyce

Unlike p-electron chromophores, the peralkylated n-tetrasilane sigma-electron chromophore resembles a chameleon in that its electronic spectrum changes dramatically as its silicon backbone is twisted almost effortlessly from the syn to the anti conformation (changing the SiSiSiSi dihedral angle omega from 0 to 180 degrees). A combination of UV absorption, magnetic circular dichroism (MCD), and linear dichroism (LD) spectroscopy on conformationally controlled tetrasilanes 1-9, which cover fairly evenly the full range of angles omega, permitted a construction of an experimental correlation diagram for three to four lowest valence electronic states. The free chain tetrasilane n-Si4Me10(10), normally present as a mixture of three enantiomeric conformer pairs of widely different angles w, has also been included in our study. The spectral trends are interpreted in terms of avoided crossings of 1B with 2B and 2A with 3A states, in agreement with SAC-CI calculations on the excited states of 1-

Název v anglickém jazyce

Electronic Transitions in Conformationally Controlled Tetrasilanes with a Wide Range of SiSiSiSi Dihedral Angles

Popis výsledku anglicky

Unlike p-electron chromophores, the peralkylated n-tetrasilane sigma-electron chromophore resembles a chameleon in that its electronic spectrum changes dramatically as its silicon backbone is twisted almost effortlessly from the syn to the anti conformation (changing the SiSiSiSi dihedral angle omega from 0 to 180 degrees). A combination of UV absorption, magnetic circular dichroism (MCD), and linear dichroism (LD) spectroscopy on conformationally controlled tetrasilanes 1-9, which cover fairly evenly the full range of angles omega, permitted a construction of an experimental correlation diagram for three to four lowest valence electronic states. The free chain tetrasilane n-Si4Me10(10), normally present as a mixture of three enantiomeric conformer pairs of widely different angles w, has also been included in our study. The spectral trends are interpreted in terms of avoided crossings of 1B with 2B and 2A with 3A states, in agreement with SAC-CI calculations on the excited states of 1-

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CC - Organická chemie

OECD FORD obor

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Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Chemistry - A European Journal

ISSN

0947-6539

e-ISSN

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Svazek periodika

20

Číslo periodika v rámci svazku

30

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

11

Strana od-do

9431-9441

Kód UT WoS článku

000339568800040

EID výsledku v databázi Scopus

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