Two-dimensional 31P exchange NMR study of adsorbed phosphine layers

被引：6
|
作者：
Gay, ID [1 ]
Hu, B [1 ]
Sheng, TC [1 ]
机构：
[1] Simon Fraser Univ, Dept Chem, Burnaby, BC V5A 1S6, Canada
来源：
LANGMUIR | 1999年 / 15卷 / 19期
关键词：
D O I：
10.1021/la990302i
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Adsorption of organic phosphines on acidic surfaces produces phosphonium ions, which can be detected by P-31 NMR, since their chemical shift is different from that of the free phosphine. In the presence of excess adsorbed phosphine, lines from both phosphine and phosphonium are observed. Two-dimensional exchange NMR is applied to trimethyl- and triphenylphosphines adsorbed on SiO2-Al2O3 and demonstrates that free phosphine and phosphonium ions are undergoing chemical exchange at ambient temperatures. There are two populations of PMe3H+ which exchange with different rate constants, 7 x 10(4) and 800 s(-1) respectively. PPh3H+ exchanges much more slowly with PPh3, having a rate constant of 14 s(-1).
引用
收藏
页码：6132 / 6134
页数：3
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