Comments on the papers recently published by M.M. Khandpekar et al.

It is argued that the existence of the new compounds of glycine recently reported by M.M. Khandpekar et al. (Optics Commun. 284(2011) 1583 and Optics Commun. 284(2011) 1578) is dubious. We argue that these compounds are not what the authors propose. In addition, two more similar cases are indicated.     

Response from M.A. Chuev

A response is given to critical and erroneous comments on my results reported in Pis’ma Zh. Éksp. Teor. Fiz. 85, 744 (2007) [JETP Lett. 85, 611 (2007)]. A more accurate magnetic dynamic model has been proposed for the calculation of the magnetization curves of an ensemble of single-domain particles. The preliminary calculations confirm that the asymptotic behavior in weak magnetic fields differs from the Langevin limit.     

N.M.R. spectra of oriented molecules

By analysis of the high resolution N.M.R. spectrum of 1,2,2,3-tetrachloro-propane partially oriented in a liquid-crystal solvent, it has been shown that this molecule takes up predominantly the G′G′ type of conformation.     

N.M.R. spectra of oriented molecules

The phosphorescence spectra of anthracene-h₁₀ and -d₁₀ have been studied in a number of glasses and crystalline matrices. The line widths are very matrix dependent and they range from about 150 cm^-1 to 1 cm^-1 in n-heptane. There is a correlation between the line width and the wavenumber position of the origin. A study of the relative intensities of fluorescence and phosphorescence from various sites in Shpolskii matrices has shown that the intersystem crossing rate is site dependent. It is postulated that this involves the relative energies of the singlet state and a triplet state, nearly degenerate with it, which are site dependent.     

N.M.R. study of solid perfluorocyclobutane

spin-lattice relaxation times and linewidth measurements for fluorine nuclei in solid perfluorocyclobutane are presented. The results are discussed in terms of D _2d molecular species performing fast internal motion. The relaxation measurements corroborate the existance of four solid-solid phase transitions and give some insight into their nature. The activation energies for molecular reorientation and self-diffusion processes are found to be 28·0 and 32·2 kJ mol^-1, respectively.