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Citation: Sun Xiang-Yu, Zhao Yao-Xing, Liang Xiao-Tian. Solvent Effect on Conformations of α,ω-Bis(4-Nitrophenoxy)-Alkanes[J]. Acta Physico-Chimica Sinica, ;1992, 8(05): 659-663. doi: 10.3866/PKU.WHXB19920516 shu

Solvent Effect on Conformations of α,ω-Bis(4-Nitrophenoxy)-Alkanes

1.
Graduate School, University of Science and Technology of China, Beijing 100039; Institute of Materia Medica, Chinese Academy of Medical Sciences, Beijing 100050

Received Date: 24 July 1991
Available Online: 15 October 1992

Solvent effect on the conformations of α,ω-bis(4-nitrophenoxy)-alkanes with different chain lengths(N_n) was studied by UV spectra. In poor solvents such as EG-H_2O and THF-H_2O, with the increase of water content, the K-bands of N_4, N_5, N_6 and N_(10) in the UV absorption spectra shifted to longer wavelengths as compared with 4-nitrophenoxyethane(N_0). It is suggested that in poor solvents the two aromatic groups are close in parallel to each other, forming ground state complexes. The K-band of N_4 showed a blue shift from that of N_0 when the water content was around 5% this may probably be attributable to a conformation with the nitro group of one benzene ring siting on the plane of the other benzene ring.
- Solvent effect; Conformation; Hydrophobic-lipophilic interaction; Ultraviblet spectra
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