极化转移INEPT与DEPT以及季碳脉冲序列等方法在~(13)CNMR测定中的应用
APPLICATION OF POLARIZATION TRANSFER TECHNIQUE INEPT, DEPT AND QUATERNARY CARBON PULSE SEQUENCE IN ~(13)CNMR DETERMINATION
-
摘要: NMR测定灵敏度较低,对于那些天然丰度低而磁矩又较小的核,这一问题更为突出。70年代末80年代初,出现了一系列基于极化转移技术的多脉冲序列方法如INEPT~*和DEPT~(**)等,用于测定~(18)CNMR谱,极大地提高了灵敏度,其增强因子与偶极—偶极弛豫是否Abstract: Polarization transfer technique INEPT, DEPT and Quaternary Carbon Pulse Sequence (QUAT) were tested in ~(13)CNMR determination of 2,3-dihydroxymethyl-1, 4-bis(3-hydroxy-4-methoxyphenyl)butane. Four subspectra containing only C, CH, CH_2 or CH_3 were obtai
下载: