Počet záznamů: 1
Arrays of Molecular Rotors with Triptycene Stoppers: Surface Inclusion in Hexagonal Tris(o-phenylenedioxy)cyclotriphosphazene
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SYSNO ASEP 0445865 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Arrays of Molecular Rotors with Triptycene Stoppers: Surface Inclusion in Hexagonal Tris(o-phenylenedioxy)cyclotriphosphazene Tvůrce(i) Kaleta, Jiří (UOCHB-X) RID, ORCID
Dron, P. I. (US)
Zhao, K. (US)
Shen, Y. (US)
Císařová, I. (CZ)
Rogers, C. T. (US)
Michl, Josef (UOCHB-X) RID, ORCIDCelkový počet autorů 7 Zdroj.dok. Journal of Organic Chemistry. - : American Chemical Society - ISSN 0022-3263
Roč. 80, č. 12 (2015), s. 6173-6192Poč.str. 20 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova compound based approach ; phosphonitrilic compounds ; polysilanes Vědní obor RIV CC - Organická chemie Institucionální podpora UOCHB-X - RVO:61388963 UT WOS 000356845800019 EID SCOPUS 84934999598 DOI 10.1021/acs.joc.5b00661 Anotace A new generation of rod-shaped dipolar molecular rotors designed for controlled insertion into channel arrays in the surface of hexagonal tris(o-phenylenedioxy)cyclotriphosphazene (TPP) has been designed and synthesized. Triptycene is used as a stopper intended to prevent complete insertion, forcing the formation of a surface inclusion. Two widely separated C-13 NMR markers are present in the shaft for monitoring the degree of insertion. The structure of the two-dimensional rotor arrays contained in these surface inclusions was examined by solid-state NMR and X-ray powder diffraction. The NMR markers and the triptycene stopper functioned as designed, but half of the guest molecules were not inserted as deeply into the TPP channels as the other half. As a result, the dipolar rotators were distributed equally in two planes parallel to the crystal surface instead of being located in a single plane as would be required for ferroelectricity. Dielectric spectroscopy revealed rotational barriers of similar to 4 kcal/mol but no ferroelectric behavior. 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 2016
Počet záznamů: 1