Počet záznamů: 1
Bulk Inclusions of Double Pyridazine Molecular Rotors in Hexagonal Tris(o-phenylene)cyclotriphosphazene
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SYSNO ASEP 0507863 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Bulk Inclusions of Double Pyridazine Molecular Rotors in Hexagonal Tris(o-phenylene)cyclotriphosphazene Tvůrce(i) Kaleta, Jiří (UOCHB-X) RID, ORCID
Bastien, Guillaume (UOCHB-X) ORCID
Wen, Jin (UOCHB-X) RID, ORCID
Dračínský, Martin (UOCHB-X) RID, ORCID
Tortorici, E. (US)
Císařová, I. (CZ)
Beale, P. D. (US)
Rogers, C. T. (US)
Michl, Josef (UOCHB-X) RID, ORCIDZdroj.dok. Journal of Organic Chemistry. - : American Chemical Society - ISSN 0022-3263
Roč. 84, č. 13 (2019), s. 8449-8467Poč.str. 19 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova solid state ; surface inclusion ; motion Vědní obor RIV CC - Organická chemie Obor OECD Organic chemistry Způsob publikování Omezený přístup Institucionální podpora UOCHB-X - RVO:61388963 UT WOS 000474796800008 EID SCOPUS 85067967686 DOI 10.1021/acs.joc.9b00553 Anotace A new generation of double pyridazine molecular rotors differing in intramolecular dipole-dipole spacing was synthesized. All rotor molecules formed bulk inclusions in a tris(o-phenylenedioxy)cyclotriphosphazene (TPP) host. Results of dielectric spectroscopy were fitted to a pair of nine-state models that accounted for interactions of neighboring dipoles at either an aligned or opposed possible orientation of the local threefold dipole rotation potentials within a channel of the TPP host. The results indicate dipole- dipole interaction strengths at the 100 to 200 K scale that lead dipoles to preferentially populate a subset of low-energy configurations. They also reveal that pyridazines with ethynyl substituents in 3- and 6-positions have slightly higher rotational barriers (3.2-3.5 kcal/mol) than those carrying one ethynyl and one tert-butyl group (1.9-3.0 kcal/mol). Upon cooling, these barriers reduce the rate of thermal transitions between the potential wells so much that the inclusions cannot achieve ordered dipolar ground states. Pracoviště Ústav organické chemie a biochemie Kontakt asep@uochb.cas.cz ; Kateřina Šperková, Tel.: 232 002 584 ; Jana Procházková, Tel.: 220 183 418 Rok sběru 2020 Elektronická adresa https://pubs.acs.org/doi/10.1021/acs.joc.9b00553
Počet záznamů: 1