Molecular motion in some radiolabelled dipeptides: a muon spin relaxation study

被引：2
|
作者：
Rhodes, CJ
Dintinger, TC
Morris, H
Scott, CA
机构：
[1] Liverpool John Moores Univ, Sch Pharm & Chem, Liverpool L3 3AF, Merseyside, England
[2] Rutherford Appleton Lab, ISIS Pulsed Muon Facil, Didcot OX11 0QX, Oxon, England
来源：
MAGNETIC RESONANCE IN CHEMISTRY | 2002年 / 40卷 / 06期
关键词：
radiolabelling; moon; peptide; molecular dynamics;
D O I：
10.1002/mrc.1030
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Activation parameters were determined for the dynamics of radicals formed by muonium addition to glycylglycine (GlyGly; H3N+CH2CONHCH2CO2-) and the doubly protected alanylalanine derivative [Boc-AlaAla-Bz; (BuOCONHCH)-O-t(Me)CONHCH(Me)CO-O-CH2Ph]. GlyGly forms an adduct by muonium addition to the amide carbonyl group which isomerizes by flipping the muon between opposite sides of the molecule, requiring an activation energy of 20.4 kJ mol(-1). In Boc-AlaAla-Bz, muonium addition to the benzene ring of the benzyl (-CH2Ph) group occurs, exhibiting an activation energy of 9.4 kJ mol(-1), believed to be from torsion about the C-Ph bond. Copyright (C) 2002 John Wiley Sons, Ltd.
引用
收藏
页码：421 / 423
页数：3
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