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Titolo:
Inclusion of poly(ethylene glycol)s by crystalline (R)-(1-naphthyl)glycyl-(R)-phenylglycine
Autore:
Akazome, M; Takahashi, T; Sonobe, R; Ogura, K;
Indirizzi:
Chiba Univ, Fac Engn, Dept Mat Technol, Inage Ku, Chiba 2638522, Japan Chiba Univ Chiba Japan 2638522 t Technol, Inage Ku, Chiba 2638522, Japan Chiba Univ, Fac Engn, Grad Sch Sci & Technol, Inage Ku, Chiba 2638522, Japan Chiba Univ Chiba Japan 2638522 & Technol, Inage Ku, Chiba 2638522, Japan
Titolo Testata:
SUPRAMOLECULAR CHEMISTRY
fascicolo: 1, volume: 13, anno: 2001,
pagine: 109 - 136
SICI:
1061-0278(2001)13:1<109:IOPGBC>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHENYL SULFOXIDES; (R)-PHENYLGLYCYL-(R)-PHENYLGLYCINE; UREA; RECOGNITION; DERIVATIVES; CAVITIES;
Keywords:
molecular recognition; polymer inclusions; fractionation; dipeptides; thermal analysis; molecular distribution;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Ogura, K Chiba Univ, Fac Engn, Dept Mat Technol, Inage Ku, 1-33 Yayoicho, Chiba 2638522, Japan Chiba Univ 1-33 Yayoicho Chiba Japan 2638522 hiba 2638522, Japan
Citazione:
M. Akazome et al., "Inclusion of poly(ethylene glycol)s by crystalline (R)-(1-naphthyl)glycyl-(R)-phenylglycine", SUPRAMOL CH, 13(1), 2001, pp. 109-136

Abstract

Crystallization of (R)-(1-naphthyl)glycyl-(R)phenylglycine [(R,R)-1] in the presence of oligo(ethylene glycol) dimethyl others 2(n) or poly(ethylene glycol)s (PEGs, 3(M-n)) afforded inclusion compounds. The ratio of (R,R)-1/the guest polymer (2 or 3) was proportional to the length of the polymer chain. The crystal structure of a hepta(ethylene glycol) dimethyl ether-included compound was disclosed by X-ray crystallography which showed that (R,R)-1 molecules form a sheet and the guest molecule penetrates the crystal lattice of (R,l;l)-1 through a one-dimensional channel on the sheet. Powder X-ray analysis revealed that, regardless of the length of the guest polymer, the distance between the neighboring sheets remains unchanged (12.0-12.3 Angstrom) in these inclusion crystals. By thermal analysis, it was shown thatthe decomposition points of those inclusion compounds became higher with the longer PEG included. The inclusion phenomenon enabled the fractionation of PEGs with various molecular weights, among which longer PEG was preferably included.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 12:33:10