✦ LIBER ✦
Tris(trimethylsilyl)methane as an internal 13C NMR chemical shift thermometer
✍ Scribed by William H. Sikorski; Aaron W. Sanders; Hans J. Reich
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 228 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
✦ Synopsis
Tris(trimethylsilyl)methane has excellent properties for an internal chemical shift thermometer to measure temperatures in 13C DNMR spectroscopy [*d between the 13C signals of and CH carbons]. It is Si(CH 3
) 3 chemically inert, soluble in most organic solvents and has an almost linear dependence of *d on temperature. The sensitivity (approximately 1 ¡C Hz~1 at 90 MHz) allows the measurement of temperature to within 1 ¡C. The chemical shift is solvent dependent, so each solvent mixture must be calibrated. Calibrations are presented for seven solvents.