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Isomorphous rare-earth tris[bis(2,6-diisopropylphenyl)phosphate] complexes and their catalytic properties in 1,3-diene polymerization and in inhibited oxidation of polydimethylsiloxaneстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Minyaev Mikhail E., Tavtorkin Alexander N., Korchagina Sof’ya A., Bondarenko Galina N., Churakov Andrei V., Nifant’ev Ilya E.
- Журнал: ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY
- Год издания: 2018
- Издательство: John Wiley & Sons Inc.
- Местоположение издательства: United States
- DOI: 10.1107/S2053229618005570
- Аннотация: Crystals of mononuclear tris[bis(2,6-diisopropylphenyl)phosphato-O]pentakis(methanol-O)lanthanide methanol monosolvates of lanthanum, [La-C24H34O4P)3(CH3OH)5]CH3OH, (1),cerium, [Ce(C24H34O4P)3(CH3OH)5]-CH3OH, (2), and neodymium, [Nd(C24H34O4P)3(CH3OH)5]CH3OH, (3), have been obtained by reactions between LnCl3(H2O)n (n = 6 or 7) and lithium bis(2,6-diisopropylphenyl) phosphate in a 1:3 molar ratio in methanol media. Compounds (1)–(3) crystallize in the monoclinic P21/c space group and have isomorphous crystal structures. All three bis(2,6-diisopropylphenyl) phosphate ligands display a O-monodentate coordination mode. The coordination number of the metal atom is 8. Each [Ln{O2P(O-2,6-iPr2C6H3)2}3(CH3OH)5] molecular unit exhibits four intramolecular O—H O hydrogen bonds, forming six-membered rings. The unit forms two intermolecular O—H O hydrogen bonds with one noncoordinating methanol molecule. All six hydroxy H atoms are involved in hydrogen bonding within the [Ln{O2P(O-2,6-iPr2C6H3)2}3- (CH3OH)5]CH3OH unit. This, along with the high steric hindrance induced by the three bulky diaryl phosphate ligands, prevents the formation of a hydrogenbond network. Complexes (1)–(3) exhibit disorder of two of the isopropyl groups of the phosphate ligands. The cerium compound (2) demonstrates an essential catalytic inhibition in the thermal decomposition of polydimethylsiloxane in air at 573 K. Catalytic systems based on the neodymium complex tris[bis(2,6-diisopropylphenyl) phosphato-O]neodymium, (30), which was obtained as a dry powder of (3) upon removal of methanol, display a high catalytic activity in isoprene and butadiene polymerization.
- Добавил в систему: Нифантьев Илья Эдуардович