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A New Two-Dimensional Pulse Sequence for T2* Measurements of Protons in 13C Isotopomers

✍ Scribed by Jörg Lambert; Stephan Haiber; Helmut Herzog

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 71 KB
Volume: 150
Category: Article
ISSN: 1090-7807
DOI: 10.1006/jmre.2001.2335

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✦ Synopsis

A new two-dimensional pulse sequence for T * 2 measurement of protons directly coupled to 13 C spins is proposed. The sequence measures the tranverse relaxation time of heteronuclear proton single-quantum coherence under conditions of free precession and is therefore well suited to evaluate relaxation losses of proton magnetization during preparation delays of heteronuclear pulse experiments in analytical NMR. The relevant part of the pulse sequence can be inserted as a "building block" into any direct or inverse detecting H,C correlation pulse sequence if proton spin-spin relaxation is to be investigated. In this contribution, the building block is inserted into a HETCOR as well as into a HMQC pulse sequence. Experimental results for the HETCOR-based sequence are given.

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