Transformations of Dichloromethane Radicals in Alkaline Water Solutions

Among transformation products of HCl₂ and H₂Cl radicals generated by -irradiation of deaerated water solutions of dichloromethane oxygen-containing compounds (formic acid, formaldehyde, carbon monoxide) and chloride ions were found. The radicals CHCl₂ suffer nucleophilic substitution by hydroxyl ions affording anion-radicals HCOO^{- 2} that further transform into formic acid. At the growing concentration of alkali the frequency of chlorine substitution with hydroxyl ions in the dichloromethane radicals increases, and their transformation process becomes a chain reaction.     

Bandwidth,sharpness, and visibility of resonances in light reflectance and transmittance of free monolayer Fabry-Perot interferometers

The conditions for the formation of Fabry-Perot resonances in optical reflectance and transmittance spectra by transparent and absorbing interferometers are investigated. Relations describing their instrumental characteristics are derived.     

Quantum-chemical investigation of some oligomeric heteroaromatic compounds

Indigo and its dimer, trimer, dehydro, and leuco forms were investigated within the framework of the Pariser-Parr-Pople method. The electronic structures of the compounds in the ground and excited states and the effect of chain lengthening are discussed, and the UV absorption spectra are interpreted. Several characteristics of the chromaticity of the investigated compounds as representatives of vat dyes are examined. The estimated (from calculations) energetic favorability of the indigoid, dehydro, and leuco forms of indigo is used in discussing the observed and experimental ease of redox transformations of indigo.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 794–798, June, 1972.