Abstract
Infrared absorption spectra of 26 kinds of diphenyl ether derivatives, including dimethyldiphenyl, dinitrodiphenyl, and nitrochlorodiphenyl ethers, were measured in the region of 4000 to 660cm-1 and characteristic absorption bands for C-O-C bond were examined. There is a strong absorption band in the region of 1256-1238cm-1, considered to be due to asymmetric stretching vibration of C-O-C. Effect of nitro and chloro radicals on this absorption maximum is not so marked while the maximum is seen in a higher wave-number side in m-methyl substituents. As other characteristic bands, a medium absorption is observed in the region of 952-935cm-1 in diphenyl ether derivatives possessing a m-methyl or a m-nitro group, and in the region of 909-851cm-1 in other derivatives. Assignment of this absorption band is not clear but it may possibly be that of a symmetric stretching vibration of C-O-C. Examinations were also made on characteristic bands, other than the above, in the region of C-H out-of-plane vibrations.
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