Nuclear Spin−Spin Coupling via Nonbonded Interactions. 8.<sup>1</sup> The Distance Dependence of Through-Space Fluorine−Fluorine Coupling
作者:Frank B. Mallory、Clelia W. Mallory、Kelly E. Butler、Mary Beth Lewis、Angell Qian Xia、Eddie D. Luzik、Laura E. Fredenburgh、Mercy M. Ramanjulu、Que N. Van、Michelle M. Francl、Dana A. Freed、Chandra C. Wray、Christine Hann、Maryellen Nerz-Stormes、Patrick J. Carroll、Lisa E. Chirlian
DOI:10.1021/ja993032z
日期:2000.5.1
The 19F19F nuclearspin−spincoupling constants JFF for a set of eighteen compoundsrelated structurally to 1,8-difluoronaphthalene were measured by 19F NMR spectroscopy. The FF distances dFF in these compounds were determined by ab initio 3-21G* molecular orbital calculations. Consistent with the lone-pair overlap theory of the origins of through-space 19F19F coupling, an exponential relationship