关于一种新型C2对称大环配体动态行为的核磁共振研究。
NMR investigation into the dynamic behaviour of a novel C2-symmetric macrocyclic ligand.
作者信息
Scheuermann J Erik W, Bento Edson S, Hawkes Geoffrey E, Watkinson Michael
机构信息
Department of Chemistry, Queen Mary, University of London, Mile End Road, London E1 4NS, UK.
出版信息
Magn Reson Chem. 2005 Apr;43(4):321-5. doi: 10.1002/mrc.1539.
DOI:10.1002/mrc.1539
PMID:15674818
Abstract
The variable-temperature (1)H NMR spectra of a tosylated triazacyclononane are reported. The spectra show a dynamic process which is assigned to hindered rotation about the amide-like N--S bonds, and a value for the free energy of activation for the rotations is derived, DeltaG* = 50.2 kJ mol(-1) at 273 K. Steric and electronic factors which influence the barrier are discussed.
摘要
报道了一种对甲苯磺酰化三氮杂环壬烷的变温¹H NMR谱。该谱显示了一个动态过程，该过程归因于围绕酰胺样N-S键的受阻旋转，并得出了旋转活化自由能的值，在273 K时ΔG* = 50.2 kJ mol⁻¹。讨论了影响势垒的空间和电子因素。
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