KNIPE A. C.; SRIDHAR N.; LOUND-KEAST J., J. CHEM. SOC. PERKIN TRANS., 1977, PART 1, NO 5, 581-583
作者:KNIPE A. C.、 SRIDHAR N.、 LOUND-KEAST J.
DOI:——
日期:——
Charge-Transfer Interaction and Molecular Arrangement in the Crystals of 2-(<i>p</i>-Nitrophenoxy)ethyl Ethers and Amines
作者:Yasuhiro Mazaki、Kiyoshi Mutai
DOI:10.1246/bcsj.68.3247
日期:1995.11
X-Ray crystallographic analysis of the Acceptor-(CH2)2-Donor type compounds, p-O2NC6H4OCH2CH2OAr (Ar = m- and p-Me2NC6H4, and m-Et2NC6H4) and p-O2NC6H4OCH2CH2N(CH3)C6H4OMe-p, has been carried out. Among these, only m-dimethylamino derivative (1) gives dark red prisms in which a close arrangement of the electron-donor and acceptor groups is observed. With regard to the central C–C bond in ArO–C–C–OAr′ or ArO–C–C–NAr′, three of the above-mentioned four compounds show gauche conformation: 1 is the exception. The preference of the gauche , probably characteristic of O–C–C–O (or –N) group, is suggested to be due to a small energy difference between the trans and gauche forms by using the MM2 and the PM3 approximation. Charge-transfer interaction energy in 1 as an intermolecular force is estimated to be barely large enough to make the trans conformation favorable over the gauche.