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Titolo:
Host-guest interactions in P1, SUZ-4, and ZSM-57 zeolites containing N,N,N,N ',N ',N '-hexaethylpentanediammonium ion as a guest molecule
Autore:
Paik, WC; Shin, CH; Lee, JM; Ahn, BJ; Hong, SB;
Indirizzi:
Hanbat Natl Univ, Dept Chem Technol, Taejon 305719, South Korea Hanbat Natl Univ Taejon South Korea 305719 l, Taejon 305719, South Korea Chungbuk Natl Univ, Dept Chem Engn, Cheongju 361763, South Korea Chungbuk Natl Univ Cheongju South Korea 361763 ongju 361763, South Korea Chonbuk Natl Univ, Sch Chem Sci & Technol, Chonju 561757, South Korea Chonbuk Natl Univ Chonju South Korea 561757 , Chonju 561757, South Korea
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 41, volume: 105, anno: 2001,
pagine: 9994 - 10000
SICI:
1520-6106(20011018)105:41<9994:HIIPSA>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
TETRAMETHYLAMMONIUM ION; SKELETAL ISOMERIZATION; CATALYTIC EVALUATION; FRAMEWORK TOPOLOGY; ORGANIC-MOLECULES; RAMAN-SPECTRA; POSITION; TEMPLATE; CATIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Hong, SB Hanbat Natl Univ, Dept Chem Technol, Taejon 305719, South Korea Hanbat Natl Univ Taejon South Korea 305719 305719, South Korea
Citazione:
W.C. Paik et al., "Host-guest interactions in P1, SUZ-4, and ZSM-57 zeolites containing N,N,N,N ',N ',N '-hexaethylpentanediammonium ion as a guest molecule", J PHYS CH B, 105(41), 2001, pp. 9994-10000

Abstract

The H-1-C-13 CP MAS NMR and Raman spectra of N,N,N,N',N',N'-hexaethylpentanediammonium (Et-6-diquat-5) ions encapsulated within P1, SUZ-4, and ZSM-57zeolites are presented. The Et-6-diquat-5 molecules occluded are found to adopt distinct molecular conformations in order to fit in the pores of eachzeolite host. Computer modeling studies show that encapsulation of Et-6-diquat-5 in the small-pore zeolite P1 is not energetically favorable. However, a remarkable match between the conformation of guest molecule and the geometry of the host structure is observed for the medium-pore zeolites SUZ-4 and ZSM-57, revealing the existence of organic structure-directing effect. The overall results of this study suggest that conformations available to the flexible, linear organic cation like Et-6-diquat-5 may differ considerably according to the type and concentration of alkali cations present in thezeolite synthesis mixture, which is a critical factor affecting the phase selectivity of the crystallization. It thus appears that the modification of conformations of flexible organic structure-directing agents by varying the type and concentration of alkali cations may be an area of considerable possibility for finding new zeolite structures.

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Documento generato il 28/03/20 alle ore 10:38:51