Interaction between the carbonyl group and a sulphur atom. Part 9. The relationship between conformation and ground- and excited-state interactions in some α-sulphur-substituted cycloalkanones
作者:Blanka Wladislaw、Hans Viertler、Paulo R. Olivato、Isabel C. C. Calegão、Vera L. Pardini、Roberto Rittner
DOI:10.1039/p29800000453
日期:——
Similarly, hyperconjugative interaction in the excited state is proposed to account for the bathochromic shift of the n→π* band, at 300 nm, of the same compounds. The shorter wavelength u.v. absorption band, at 250 nm, is assigned to charge transfer from sulphur to the carbonyl group owing to its dependence on the position of the 3p orbital of sulphur relative to the carbonyl group.
一些α-硫取代的环烷酮的构型大约是从红外光谱中估计出来的。羰基,这些化合物中的拉伸频率,通过与相应的未取代的酮(Δν比较的减少CO),被报告和解释为由于hyperconjugativeσC(2)-S-π CO相互作用上的位置的依赖性的基础上C(2)–S键的数量。类似地,提出了在激发态下的超共轭相互作用,以说明相同化合物在300 nm处n→π*带的红移。由于其对3 p位置的依赖性,在250 nm处较短的波长uv吸收带被指定为从硫到羰基的电荷转移 硫相对于羰基的轨道。