DEFT polarization transfer in Si-29-NMR investigations of organically modified alkoxysilanes

被引：7
|
作者：
Alam, TM
机构：
来源：
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 1997年 / 53卷 / 04期
关键词：
nuclear magnetic resonance; organically modified alkoxysilanes; sol-gel materials; SOL-GEL POLYMERIZATION; DQF COSY NMR; SPIN SYSTEMS; INEPT; ENHANCEMENT; HYDROLYSIS; HETERONUCLEAR; POLYMERS; KINETICS; SIGNALS;
D O I：
10.1016/S1386-1425(96)01806-9
中图分类号：
O433 [光谱学];
学科分类号：
0703 ; 070302 ;
摘要：
The DEFT heteronuclear polarization transfer pulse sequence was used to unambiguously assign the high-resolution Si-29-NMR (nuclear magnetic resonance) for the hydrolyzed monomer species in trimethylmethoxysilane, dimethyldimethoxysilane and methyltrimethoxysilane. The response of the DEFT sequence as a function of the interpulse delay time tau and the variable pulse angle theta were analyzed for spin systems with multiple heteronuclear J-couplings. These results allow the DEFT sequence to be optimized for sensitivity enhancement in addition to providing an editing method for Si-29-NMR of organically modified alkoxysilanes. (C) 1997 Elsevier Science B.V.
引用
收藏
页码：545 / 552
页数：8
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