Chlorine nuclear quadrupole resonance lineshape in the cubic antifluorite K2OsCl6

1985 ◽  
Vol 63 (3) ◽  
pp. 350-353 ◽  
Author(s):  
Maximo E. Ramia ◽  
Robin L. Armstrong
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Point Defects ◽  
Temperature Dependent ◽  
Local Strains ◽  
Temperature Range ◽  
Quadrupole Resonance ◽  
Symmetric Line ◽  
Nuclear Quadrupole

Chlorine nuclear quadrupole resonance lineshapes are reported for the cubic antifluorite K2OsCl6 in the temperature range 70–300 K. For temperatures above 172 K the spectrum consists of a single symmetric line; for temperatures below 172 K an asymmetric line is observed which can be represented as a sum of two symmetric lines. The symmetric lines are temperature dependent mixtures of Lorentzian and Gaussian profiles. The explanation is that the nuclear quadrupole resonance lines observed in K2OSCl6 are inhomogeneously broadened by temperature dependent local strains caused by point defects and dislocations.

scholarly journals 79Br and 127І Nuclear Quadrupole Resonance Investigations of Ortho-Substituted Anilinium Halides, 2-RC6H4NH3⊕ X⊖ with X = Br, I and R = CI, CN, C2H5, NH2, and NH3⊕ X⊖

1991 ◽  
Vol 46 (4) ◽  
pp. 367-375 ◽  
Author(s):  
Jutta Hartmann ◽  
Alarich Weiss
Keyword(s):  
Phase Transitions ◽  
Nuclear Quadrupole Resonance ◽  
Temperature Range ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

Abstract The 79Br and 127I nuclear quadrupole resonance, NQR, spectra of ortho-substituted anilinium bromides and iodides 2-RC6H4NH3⊕ X⊖ with X = Br, I and R = CI, CN, C2H5, NH2, and NH3⊕ X⊖ have been investigated in the temperature range 77 < T/K <420. Phase transitions occur in 2-(C2H5)C6H4NH3⊕ Br⊖ ½H2O at Tc= 164 K. in 2-(C2H5)C6H4NH3⊕ I⊖ at Tc = 214 K, in [1,2-C6H4(N(H,D)3)-]2⊕[Br⊖]2 at Tc = 209 K, and in [1,2-C6H4(NH3)2]2⊕[I⊖]2 at Tc = 173 K. The NQR data are discussed and compared with NQR spectra of para-substituted anilinium halides

Nuclear Quadrupole Resonance Study of 35Cl in Chloral Hydrate, CCl3CH(OH)2, and Chloral Deuterate, CCl3CH(OD)2

1967 ◽  
Vol 22 (7) ◽  
pp. 1124-1126 ◽  
Author(s):  
Dieter Biedenkapp ◽  
Alarich Weiss
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Crystal Field ◽  
Room Temperature ◽  
Chloral Hydrate ◽  
Temperature Range ◽  
Field Effects ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

The nuclear quadrupole resonance (NQR) spectra of 35Cl in chloral hydrate and chloral deuterate were investigated in the temperature range between 77°K and 323 °K. Two modifications have been found for each substance. One of the modifications is unstable at room temperature and changes within a few weeks into the stable modification. The NQR spectrum can be explained in terms of crystal field effects.

121,123Sb and 209Bi Nuclear Quadrupole Resonance Study of Complex Compounds of Antimony(III) and Bismuth(III) in the Temperature Range 77-400 K

1998 ◽  
Vol 53 (6-7) ◽  
pp. 573-584 ◽  
Author(s):  
L. A. Zemnukhova ◽  
R. L. Davidovich
Keyword(s):  
Aqueous Solutions ◽  
Nuclear Quadrupole Resonance ◽  
Crystal Structures ◽  
Wide Temperature Range ◽  
Complex Compounds ◽  
Temperature Range ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

Abstract A large number of solid fluoride and heteroligand acidocomplex compounds of antimony(III) and bismuth(III) with single and mixed cations has been prepared from aqueous solutions. Their crystal structures and 121,123Sb and 209Bi NQR spectra have been investigated in a wide temperature range.

The chemical interpretation and the temperature dependence of the 14N nuclear quadrupole resonance of aniline and several derivatives

1968 ◽  
Vol 46 (22) ◽  
pp. 3595-3604 ◽  
Author(s):  
C. T. Yim ◽  
M. A. Whitehead ◽  
Donald H. Lo
Keyword(s):  
Temperature Dependence ◽  
Nuclear Quadrupole Resonance ◽  
Coupling Constants ◽  
Temperature Range ◽  
Resonance Frequencies ◽  
Quadrupole Coupling ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole ◽  
Asymmetry Parameters ◽  
Phenylene Diamine

The 14N nuclear quadrupole resonance frequencies of aniline, o- and p-phenylene diamine, and p-chloro-, p-bromo-, and p-iodo-aniline were measured with a super-regenerative oscillator over a temperature range from 77 to 292 °K. The temperature dependence is analyzed. The chemical interpretation of the quadrupole coupling constants and asymmetry parameters is described.

A study of the chlorine nuclear quadrupole resonance frequency spectrum in potassium hexachloro-osmate by Fourier transform methods

1980 ◽  
Vol 58 (5) ◽  
pp. 657-663 ◽  
Author(s):  
J. David Mintz ◽  
Robin L. Armstrong
Keyword(s):  
Fourier Transform ◽  
Single Crystal ◽  
Detailed Analysis ◽  
Nuclear Quadrupole Resonance ◽  
Main Line ◽  
Line Spectrum ◽  
Single Crystal Sample ◽  
Quadrupole Resonance ◽  
Symmetric Line ◽  
Nuclear Quadrupole

A study of the chlorine nuclear quadrupole resonance spectrum of K2OsCl6 in the vicinity of the structural phase transition using Fourier transform techniques is reported. At high temperatures a single symmetric line spectrum is observed as expected from the high temperature cubic antifluorite structure. Below Tc = 45 K the two symmetric line spectrum characteristic of a tetragonal distortion is seen. At intermediate temperatures, 45 < T < 150 K the spectrum consists of a single asymmetric line. A detailed analysis reveals that for the single crystal sample the asymmetric line is composed of two symmetric components, a main line, and a weak satellite shifted −1.5 kHz relative to the main line. This feature is unaffected by changes in temperature near Tc. It is attributed to the influence of interstitial impurities on neighbouring chlorine ions. For the powder sample, the asymmetry is qualitatively different. A detailed analysis shows that the line is a superposition of three components. In addition to the two components present in the single crystal, a third, broad component develops as the temperature approaches Tc. This feature of the spectrum is the cluster induced order-disorder manifestation of the local dynamics. The most probable reason that this third component is not observed in the single crystal spectrum is because it is too broad due to a difference in the detailed dynamics of the two samples.

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