cis Versus trans-Azobenzene: Precise Determination of NMR Parameters and Analysis of Long-Lived States of ¹⁵N Spin Pairs.

ABSTRACT: We provide a detailed evaluation of nuclear magnetic resonance (NMR) parameters of the cis- and trans-isomers of azobenzene (AB). For determining the NMR parameters, such as proton-proton and proton-nitrogen J-couplings and chemical shifts, we compared NMR spectra of three different isotopomers of AB: the doubly ¹⁵N labeled azobenzene, ¹⁵N,¹⁵N'-AB, and two partially deuterated AB isotopomers with a single ¹⁵N atom. For the total lineshape analysis of NMR spectra, we used the recently developed ANATOLIA software package. The determined NMR parameters allowed us to optimize experiments for investigating singlet long-lived spin states (LLSs) of ¹⁵N spin pairs and to measure LLS lifetimes in cis-AB and trans<

SUBMITTER: Sheberstov KF 

PROVIDER: S-EPMC5811614 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature