Quantum-chemical calculations of NMR chemical shifts of organic molecules: IV. Effect of intermolecular coordination on 31P NMR shielding constants and chemical shifts of molecular complexes of phosphorus pentachloride with azoles
作者:K. A. Chernyshev、L. I. Larina、E. A. Chirkina、V. G. Rozinov、L. B. Krivdin
DOI:10.1134/s107042801112013x
日期:2011.12
Intermolecular coordination effects on the 31P NMR spectra of molecular complexes of N-vinylimidazole and 1-allyl-3,5-dimethylpyrazole with phosphoruspentachloride were studied by theoretical and experimental methods. The formation of intermolecular dative N→P bond was shown to be accompanied by upfield shift of the phosphorus resonance signal by more than 200 ppm. Appreciable contribution of relativistic
通过理论和实验方法研究了分子间配位对N-乙烯基咪唑和1-烯丙基-3,5-二甲基吡唑与五氯化磷分子配合物的31 P NMR谱的影响。分子间固定的N→P键的形成被证明伴随着磷共振信号的高场偏移超过200ppm。揭示了相对论效应对31 P NMR化学位移的显着贡献。自旋轨道对31的贡献P屏蔽常数估计> 210 ppm。在研究吡咯与五氯化磷的分子配合物的空间结构以及分子间配位对31P NMR化学位移的影响时,考虑到溶剂作用至关重要。