Infrared Spectra of Some Troponoid and Aromatic Compounds adsorbed on Column Chromatogram

Some examinations were made on infrared absorption spectra of substances as adsorbed on silica gel or activated alumina in column chromatography. From the results obtained with several troponoid and aromatic compounds, it was found that the spectrum of the adsorbed substance can be obtained by measuring the adsorbent carrying the substance by the potassium bromide disk method when the amount adsorbed is comparatively large. This method will be useful for the identification of organic compounds and studies on the mode of their adsorption. Results obtained from some troponoid and aromatic compounds possessing hydroxyl, amino, or carbonyl as the functional group indicated that there is no drastic change in their spectra when using silica gel. Phenol adsorbed on alumina already showed the spectrum of Ph-O^- ion type. The ν(C=O) band of adsorbed ketones shifted to a lower frequency region

Infrared Spectra of Troponoid Compounds. I : Tropone and Tropolone

The systematic studies on the infrared spectra of troponoid compounds are being conducted in this laboratory. As the first step, tropone, tropolone, tropolone methyl ether and hinokitiol have been examined at their gaseous states and some discussions on the result have been made

The Librational Motion of the ND_4^+ ion in ND_4I

The far-infrared spectra of ND_4I mulled with paraffin wax were recorded from 47 K to 200 K. The band at 238 cm^ observed at temperatures lower than 149 K was assigned to the librational motion of the tetradeuterioammonium ion. The bands observed at 470 and 420 cm^ in phase III were assigned to the overtone and combination band, respectively. The data for ND_4Br were also discussed

Long Range Ordering of a Linear-Chain Heisenberg Antiferromagnet, TANOL, below 1K(Physics)

Magnetization of TANOL (4-hydroxy-2, 2, 6, 6-tetramethylpiperidinoxy) has been measured with the proton NMR method below 1 K. The antiferromagnetic transition temperature T_N is determined to be 0.49±0.01 K under an external magnetic field of 1.6 kOe, which is in good agreement with the value obtained by Boucher et al. from a heat capacity measurement. The reason of the discrepancy between this value and the previously reported one is discussed. The sublattice magnetization as a function of temperature, M(T), is represented by (1-0.729T^2) in the region below 0.35 K. Critical index of the magnetization, β, is estimated to be 0.335±0.02