The infrared spectra

No abstract

Infrared absorption spectra in the range of 250‐4000 cm−1 of the three isomeric methoxyphenols are reported. The para methoxyphenol is in the solid phase at room temperature and its spectrum has been investigated in the range of 700‐4000 cm−1 in chloroform solution in addition to the spectrum recorded for its nujol mull. Under the usual approximation of the two substituent groups taken as point masses the observed bands have been assigned to different modes of vibration. These assignments have been used to calculate the molar thermodynamic functions for these compounds.

The effect of neutron irradiation on the photoacoustic spectra of Er2O3 and Nd2O3 in powder form has been studied. The irradiation shows a quenching effect on the photoacoustic signal which regains its intensity after a lapse of some time. It is believed that the irradiation changes the oxidation state of the rare-earth ions from M3+ to M2+. The half-life of the recovery process Er2+ to Er3+ in the case of irradiated Er2O3 is found to be 46 h.

The near ultraviolet absorption spectrum of toluene‐d8 has been recorded with the help of a E1 large quartz spectrograph. The (O,O) band has been identified at 37672 cm−1. The spectrum has been analysed with the help of the excited state fundamentals 282, 378, 431, 454, 508, 700, 926, 1150 and 1432 cm−1. These frequencies have been correlated with the corresponding frequencies of the normal molecule. The ration R = ν(C6H5CH3)/ν(C6D5CD3) has been calculated for each excited state mode of vibration and compared with the corresponding value of R found for the ground state vibrations.