【分享】DEPTQ -无畸变极化转移增强检测季碳

虽然不太懂，但学习一下

Multiplicity editing including quaternary carbons: improved performance for the 13C-DEPTQ pulse sequence.

Magn Reson Chem. 2007 Jun;45(6):469-72

An improved version of the DEPTQ experiment yielding the signal and multiplicity information for all carbon types including the signals of quaternary carbons is proposed. It encompasses all the known advantages of the basic DEPT experiment. In comparison to the original version, signals of the sensitivity-limiting quaternary carbons are markedly increased: the initial 13C pulse may be adjusted to the Ernst angle, the NOE build-up period is prolonged by the split relaxation delay and a partial recovery of signal losses due to instrumental imperfections is achieved by the incorporation of composite adiabatic 13C refocussing pulses. Furthermore, pure absorption lineshapes for all carbon types are obtained with only one single scan. These attributes make this experiment attractive for 13C analysis of small molecules (including spectral editing), particularly in high-throughput analysis laboratories.

在bruker仪器上的deptq实验

http://www.bruker.co.th/nmr/deptqgpsp

Multiplicity editing including quaternary carbons: improved performance for the 13C-DEPTQ pulse sequence
An improved version of the DEPTQ experiment yielding the signal and multiplicity information for all carbon types including the signals of quaternary carbons is proposed. It encompasses all the known advantages of the basic DEPT experiment. In comparison to the original version, signals of the sensitivity-limiting quaternary carbons are markedly increased: the initial 13C pulse may be adjusted to the Ernst angle, the NOE build-up period is prolonged by the split relaxation delay and a partial recovery of signal losses due to instrumental imperfections is achieved by the incorporation of composite adiabatic 13C refocussing pulses. Furthermore, pure absorption lineshapes for all carbon types are obtained with only one single scan. These attributes make this experiment attractive for 13C analysis of small molecules (including spectral editing), particularly in high-throughput analysis laboratories.
http://www3.interscience.wiley.com/cgi-bin/fulltext/114210968/PDFSTART

在Bruker的Topspin2.0中，标准的程序库中已经包含了DEPTQ实验。