INFRARED EVIDENCE FOR 2 ISOLATED SILANOL SPECIES ON ACTIVATED SILICAS

被引：39

作者：

MCFARLAN, AJ ^{[1
]}

MORROW, BA ^{[1
]}

机构：

[1] UNIV OTTAWA,DEPT CHEM,OTTAWA K1N 6N5,ONTARIO,CANADA

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1991年 / 95卷 / 14期

关键词：

D O I：

10.1021/j100167a009

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Infrared spectroscopy has been used to study the OH stretching vibration of isolated silanol groups on an aerosil and a precipitated silica which have been activated under vacuum at 450, 600, or 800-degrees-C. When the 450-degrees-C activated samples are cooled to -191-degrees-C, the normally asymmetric OH peaks splits into two components having a peak maximum near 3750 or 3746 cm-1 for the aerosil and precipitated silica, respectively, and a shoulder near 3738 cm-1. The main peak is attributed to truly isolated SiOH groups and the low-wavenumber shoulder to pairs of isolated SiOH groups on adjacent silicon atoms which are sufficiently close to slightly perturb each other. The latter are preferentially eliminated as the temperature of activation is increased.

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页码：5388 / 5390

页数：3

相关论文

共 22 条

[1] SURFACE HYDROXYLATION OF SILICA [J].

ARMISTEAD, CG ;

TYLER, AJ ;

HAMBLETON, FH ;

MITCHELL, SA ;

HOCKEY, JA .

JOURNAL OF PHYSICAL CHEMISTRY, 1969, 73 (11) :3947-+

[2] COMPARATIVE-STUDY OF THE SURFACE HYDROXYL-GROUPS OF FUMED AND PRECIPITATED SILICAS .2. CHARACTERIZATION BY INFRARED-SPECTROSCOPY OF THE INTERACTIONS WITH WATER [J].

BURNEAU, A ;

BARRES, O ;

GALLAS, JP ;

LAVALLEY, JC .

LANGMUIR, 1990, 6 (08) :1364-1372

[3] QUANTITATIVELY RELIABLE SI-29 MAGIC-ANGLE SPINNING NUCLEAR MAGNETIC-RESONANCE SPECTRA OF SURFACES AND SURFACE-IMMOBILIZED SPECIES AT HIGH-FIELD USING A CONVENTIONAL HIGH-RESOLUTION SPECTROMETER [J].

FYFE, CA ;

GOBBI, GC ;

KENNEDY, GJ .

JOURNAL OF PHYSICAL CHEMISTRY, 1985, 89 (02) :277-281

[4]

GALLAS JP, IN PRESS LANGMUIR

[5] NOVEL ASPECTS OF MID AND FAR IR FOURIER SPECTROSCOPY APPLIED TO SURFACE AND ADSORPTION STUDIES ON SIO2 [J].

HOFFMANN, P ;

KNOZINGER, E .

SURFACE SCIENCE, 1987, 188 (1-2) :181-198

[6]

Kiselev A.V., 1975, INFRARED SPECTRA SUR

[7] HYDROXYLS OF SILICA POWDERS [J].

LEGRAND, AP ;

HOMMEL, H ;

TUEL, A ;

VIDAL, A ;

BALARD, H ;

PAPIRER, E ;

LEVITZ, P ;

CZERNICHOWSKI, M ;

ERRE, R ;

VANDAMME, H ;

GALLAS, JP ;

HEMIDY, JF ;

LAVALLEY, JC ;

BARRES, O ;

BURNEAU, A ;

GRILLET, Y .

ADVANCES IN COLLOID AND INTERFACE SCIENCE, 1990, 33 (2-4) :91-330

[8] SI-29 NUCLEAR MAGNETIC-RESONANCE STUDY OF THE SURFACE OF SILICA-GEL BY CROSS POLARIZATION AND MAGIC-ANGLE SPINNING [J].

MACIEL, GE ;

SINDORF, DW .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1980, 102 (25) :7606-7607

[9] INFRARED STUDIES OF REACTIONS ON OXIDE SURFACES .7. MECHANISM OF ADSORPTION OF WATER AND AMMONIA ON DEHYDROXYLATED SILICA [J].

MORROW, BA ;

CODY, IA ;

LEE, LSM .

JOURNAL OF PHYSICAL CHEMISTRY, 1976, 80 (25) :2761-2767

[10] INFRARED STUDY OF SOME REACTIONS WITH REACTIVE SITES ON DEHYDROXYLATED SILICA [J].

MORROW, BA ;

CODY, IA .

JOURNAL OF PHYSICAL CHEMISTRY, 1975, 79 (07) :761-762