Effects of impurity on 35Cl and 14N NQR in p-chloraniline

The effect of impurity (p-toluidine) on the nuclear quadrupole resonance of two different nuclei (³⁵Cl and ¹⁴N) in the same molecule has been studied. The ¹⁴N resonance is unaffected whereas the ³⁵Cl resonance is greatly reduced.     

Alkoxyphenyltrichlorostannane35Cl NQR spectra

Irkutsk Organic Chemistry Institute, Siberian Branch, USSR Academy of Sciences. Translated from Zhurnal Strukturnoi Khimii, Vol. 30, No. 1, pp. 169–171, January–February, 1989.     

14N NQR study of nicotinamide and related compounds

14N nuclear quadrupole resonance (NQR) frequencies have been measured in picolinamide, nicotinamide, isonicotinamide, 2,6-pyridine dicarboxamide, and acetamide by double resonance. The 14N NQR spectra in picolinamide, nicotinamide, isonicotinamide, and 2,6-pyridine dicarboxamide show the presence of two distinct nitrogen positions: the ring position with the quadrupole coupling constant about 4,5 MHz and the amide position with the quadrupole coupling constant about 2.6 MHz. The NQR data are related to the structure of the investigated compounds and to the N--H...O hydrogen bonds.     

Single crystal zeeman effect studies on 35Cl NQR lines of 2,6-dichlorophenol

Zeeman effect studies on the two ³⁵Cl NQR lines in cylindrical single crystals of 2,6-dichlorophenol were carried out using a self-quenched super-regenerative NQR spectrometer to obtain information on the nature of the crystalline unit cell and the effect of hydrogen bonding on the electric field gradient tensor. Analysis of the experimental data reveals: (1) the results are in good agreement with those reported from X-ray studies; (2) the crystal is unequivocally identified as belonging to the orthorhombic system; (3) there are two crystallographically equivalent and four physically nonequivalent directions for the principal field gradients for both the low and high frequency resonance lines; (4) the directions of the crystalline a, b, c axes are uniquely identified as (90°, 0°), (0°, −), and (90°, 90°); (5) the b-axis is identified as the growth axis; (6) there are a minimum of four molecules per unit cell, the four molecules lie in different planes, which are, however, connected by symmetry operations; (7)_there exists a weak intramolecular hydrogen bonding in the crystal; (8) the asymmetry parameters for the loci corresponding to the low frequency resonance line, which is affected by hydrogen bonding, are less than the asymmetry parameters of the loci corresponding to the high frequency resonance line, which is not affected by hydrogen bonding; (9) the single bond and ionic bond characters for the hish frequency line are less than that of the low frequency line, while the double bond character for the low frequency line is less than that of the high frequency line and (10) the small deviation between the single bond and double bond characters of the two resonance lines is attributed to the existence of weak hydrogen bonding in the crystal.     

35Cl and79Br NQR spectra of halofluorosulfates

Conclusions NQR spectroscopy was used to find the localization of formal positive charge on the chlorine and bromine atoms in ClOSO₂F and BrOSO₂F.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 244–245, January, 1986.     

35Cl and79Br NQR spectra of dicyclopentadienylzirconium halides

Conclusions The NQR frequencies of the³⁵Cl and⁷⁹Br atoms in dicyclopentadienylzirconium dichloride and the corresponding dibromide are 25–30% lower than for the analogous titanium derivatives, which corresponds to a greater involvement of the P electrons of the halogen atoms in the Zr-Hal bond than in the Ti-Hal bond.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1895–1897, August, 1979.The authors are indebted to G. K. Semin for his interest in the work, and to R. Kh. Freidlina and É. M. Brainina for supplying the study samples.     

35Cl NQR spectra of osmium and iridium chlorochalcogen complexes

Conclusions A study was carried out on the NQR spectra of the chlorine atoms in Os(IV) and Ir(III) complexes with sulfur, selenium, and tellurium chlorides as ligands. The ECl₃ group coordinates as the ligand in the osmium compounds studied.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1409–1411, June, 1986.     

35Cl NQR spectrum of WS2SeCl5

Conclusions NQR spectroscopy indicates that tungsten thioselenium chloride is a complex of tungsten thiochloride and selenium dichloride with inequivalent chlorine atoms at the metal atom.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1873–1875, August, 1987.     

35Cl NQR spectra and molecular structure of cyclic chlorophosphoranes

The structure of chlorine-containing cyclic pentacoordinated phosphorus compounds has been studied by³⁵Cl NQR. The distortion of molecular geometry from trigonal bipyramid to tetragonal pyramid in going from monocyclic phosphoranes to spiro phosphoranes and the corresponding changes in the NQR spectrum are discussed.Perm State University. Institute of Organic Chemistry, Ukrainian Academy of Sciences. Translated fromZhurnal Strukturnoi Khimii, Vol. 34, No. 3, pp. 75–79, May–June 1993.Translated by L. Smolina     

35Cl NQR spectra of several aryl chloromethyl ethers

Conclusions There is a significant specific geminal interaction of the oxygen and chlorine atom in aryl chloromethyl ethers, p-RC₆H₄OCH₂Cl, although this effect is less than in alkyl chloro-methyl ethers.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 5, pp. 1195–1197, May, 1985.     

35Cl NQR spectra of several rhenium chalcochloride complexes

The³⁵Cl NQR spectra were studied for rhenium chalcochloride complexes ReX₂Cl₁₂ (X=Se, Te), Re₂XCl₁₂ (X=S, Se), and thet- and-forms of ReCl₄ and the⁷⁹Br NQR spectrum of ReBr₃ were also studied. The ReX₂Cl₁₂ complexes were found to have ReCl₆(XCl₃)₂ structure, while Re₂SCl₁₂ has Re₂Cl₉(SCl₃) structure; the selenium analog has a more complex structure. Significant differences in the halide ions were also found in rhenium halides.Deceased.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 192–195, January, 1991.     

Temperature dependence of 35Cl NQR in 2,6-dichloropyridine

Chlorine NQR in 2,6-dichloropyridine has been investigated in the temperature range 77 K to room temperature and a single resonance line has been observed throughout. Using this data, torsional frequencies of the molecule have been evaluated on the basis of both the Bayer theory and the modified Bayer theory incorporating Tatsuzaki correction.     

35Cl NQR Studies of the Geometry of Aromatic Imines

The preferred conformation of solidphase R4benzylidene3,4dichloroaniline molecules has been established by nuclear quadrupole resonance (NQR) combined with quantum chemical calculations. The conformational effect of substitutes reported previously is proved. The rotation angle of the plane of the aniline ring with respect to the plane of the azomethine bond is given.