Thermal transformations of chromium acetylacetonate on silica surface

被引:48
作者
Babich, IV
Plyuto, YV
VanderVoort, P
Vansant, EF
机构
[1] NATL ACAD SCI UKRAINE,INST SURFACE CHEM,LAB INORGAN SURFACE CHEM,UA-252022 KIEV,UKRAINE
[2] UNIV INSTELLING ANTWERP,DEPT CHEM,INORGAN CHEM LAB,B-2610 WILRIJK,BELGIUM
关键词
silica; chemical modification; chromium acetylacetonate; hydrogen bonding; ligands substitution;
D O I
10.1006/jcis.1997.4798
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
Chemical modification of a silica surface with chromium acetylacetonate (Cr(acac)(3), acac = C5H7O2) was carried out from the gas phase at 190 degrees C. This results in the formation of chromium acac species which interact with the silica surface because of hydrogen bonding between the surface hydroxyl groups and the quasi pi-electron system of two acac ligands of Cr(acac)(3). Ligand substitution in the chromium acac species on the silica surface pretreated at different temperatures was studied by IR spectroscopy, thermogravimetry, temperature-programmed oxidation, and chemical analysis. Water molecules and surface hydroxyl groups can replace acac ligands in the chromium acac surface species at 230 and 270 degrees C, respectively. The oxidation of the acac ligands in air occurs at 340 degrees C and is accompanied by conversion of Cr3+ to Cr6+. (C) 1997 Academic Press.
引用
收藏
页码:144 / 150
页数:7
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