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Vibracijska dinamika ortoterfenila

Vibrational dynamics of ortho-terphenyl
Authors: Bistričić, Lahorija; Baranović, Goran; Volovšek, Vesna; Kirin, Davor;

Vibracijska dinamika ortoterfenila

Abstract

Fazni prijelaz tekućina-staklo u ortoterfenilu (OTP)predmet je brojnih eksperimentalnih i teorijskih istraživanja. Poznavanje vibracijske dinamike OTP omogućuje bolje analiziranje staklaste faze. OTP i OTP-d14 izučavani su Ramanovom i IR spektroskopijom u otopini, talini i kristaliničnoj fazi. Molekulski vibracijski spektri analizirani su računima za dinamiku slobodne molekule na osnovu modela semi-empirijskog polja RHF/AM1, te DFT (density functional theory) s B3LYP funkcionalom i 6-31G(d) baznim setom funkcija. U oba slučaja u stanju najniže energije molekula ima C2 simetriju. Potencijalna polja AM1 i B3LYP/6-31G(d) nakon množenja s konstantama razmjernosti reproduciraju vibracijske frekvencije s prosječnom pogreškom od 13 cm-1, odnosno 5 cm-1. Torzije fenilnih prstenova izučavane su AM1 metodom, određena je ploha potencijanle energije u ovisnosti o kutovima torzije. Visina potencijanle barijere za internu rotaciju nalazi se u intervalu od 3 kJmol-1 do 6 kJmol-1. Potpuno uređena kristalna faza OTP dobivena je na niskim temperaturama. Konformacija molekule u kristalu mijenja se pod utjecajem polja u kristalu. Rezultat utjecaja unutarmolekulskih i međumolekulskih sila u kristalu je odstupanje od C2 simetrije. U račun dinamike rešetke uključeno je šest najnižih unutarmolekulskih vibracijskih modova. U računu su u početku korišteni normalni modovi vibracija slobodne molekule, nakon toga su se u iteracijskom postupku mijenjale određene međumolekulske konstante sila sve dok nije postignuto slaganje s eksperimentalnim rezultatima. Rezultati računa daju sliku vibracijske dinamike OTP u području niskih frekvencija.

Country
Croatia
Keywords

ortoterfenil ; vibracijski spektri, vibracijski spektri, vibrational spectra, ortho-terphenyl, ortoterfenil

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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