The deuterium-decoupled1H NMR spectra of the aryl groups of several compounds having the structure RMX3 (R = phenyl-2,5-d2 and MX3 = SiEt3, GeEt3, SnEt3, PbEt3, CCl3, SiCl3, GeCl3, and SnCl3) have been analyzed to obtain chemical shift values for the protonsortho, meta, andpara to the substituents. Comparison ofpara chemical shifts within this series of compounds suggests that (p→d)π bonding to carbon
氘解耦1具有以下结构的几种化合物的芳基的1 H NMR谱RMX 3(R =苯基-2,5- d 2和MX 3 = SIET 3,GEET 3,SNET 3,PBET 3,CCL 3,已经分析了SiCl 3,GeCl 3和SnCl 3)以获得质子的
化学位移值,所述质子为取代基的邻位,间位和对位。比较这一系列化合物中的对位
化学位移表明(p → d)与碳的键对确定1 H NMR光谱参数很重要,表明在化合物RM(烷基)3中此π键的有效性顺序为预期的C Ge⋍Sn> Pb,化合物RMCl 3中的相应顺序为C <Si <Ge <Sn。讨论了这种差异的可能合理化。