Quench frequency effects on the nuclear quadrupole resonance of orthoiodophenol

1968 ◽  
Vol 21 (9) ◽  
pp. 2141 ◽  
Author(s):  
TS Clarkson ◽  
WPA Sullivan
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Room Temperature ◽  
Nuclear Quadrupole Resonance Signal ◽  
Resonance Signal ◽  
Frequency Effects ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

When the quench frequency of a self-quenched spectrometer is varied, the plot of the 127I nuclear quadrupole resonance signal against quench frequency in o-iodophenol, at room temperature, exhibits a number of maxima. Hitherto, analogous plots with chlorine compounds, using self-quenched spectrometers, gave only a maximum; this is briefly discussed.

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.

Square wave frequency modulation in pure nuclear quadrupole resonance spectroscopy

1973 ◽  
Vol 26 (8) ◽  
pp. 1611 ◽  
Author(s):  
RA Caldwell
Keyword(s):  
Relaxation Time ◽  
Nuclear Quadrupole Resonance ◽  
Spin Relaxation ◽  
Modulation Frequency ◽  
Spin Relaxation Time ◽  
Resonance Spectroscopy ◽  
Nuclear Quadrupole Resonance Signal ◽  
Square Wave ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

The effect of square wave modulation frequency on the signal intensities obtained with a super-regenerative spectrometer is investigated. The dependence of the nuclear quadrupole resonance signal intensity obtained with a number of compounds is found to be related to the apparent spin-spin relaxation time of the resonant nuclei. An analysis indicates that the signal response of the resonant nuclei is the same regardless of modulation frequency. However, the fundamental Fourier component is directly related to the apparent spin-spin relaxation time.

scholarly journals Nuclear Quadrupole Resonance in Coordination Chemistry. Identification of Bridging and Terminal Chlorines in the Mercuric Chloride-4-picoline N-Oxide Complex

1979 ◽  
Vol 32 (4) ◽  
pp. 931 ◽  
Author(s):  
L Ramakrishnan ◽  
S Soundararajan ◽  
VSS Sastry ◽  
J Ramakrishna
Keyword(s):  
Coordination Chemistry ◽  
Temperature Dependence ◽  
Nuclear Quadrupole Resonance ◽  
Mercuric Chloride ◽  
Room Temperature ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

The temperature dependence of the chlorine-35 n.q.r. in the mercuric chloride-4-picoline N-oxide complex has been studied from 77 K to room temperature, and the results are used to assign the observed frequencies to terminal and bridging chlorines.

Halogen nuclear quadrupole resonance and structural relationships in some complex halides of zinc and copper

1972 ◽  
Vol 25 (11) ◽  
pp. 2301 ◽  
Author(s):  
WJ Asker ◽  
DE Scaife ◽  
JA Watts
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
Mean Values ◽  
X Ray ◽  
Rubidium Salt ◽  
Structural Relationships ◽  
Quadrupole Resonance ◽  
The Mean ◽  
Nuclear Quadrupole

X-ray diffraction and halogen nuclear quadrupole resonance (n.q.r.) methods show that Rb3ZnBr5, (NH4)3ZnBr5, and CsZnI5 are isostructural with orthorhombic (NH4)3ZnCl5, and that Rb3ZnCl5 has the tetragonal Cs3CoCl5 structure. ZnI2,2NH3 is isomorphous with the corresponding chloride and bromide diammines. Rb2ZnBr4 and (NH4)2ZnBr4 have structures of Cs2ZnBr4 type, although the rubidium salt shows some stacking faults. In the complex chlorides 35Cl n.q.r. frequencies are grouped about 9 MHz, while the bromides have 81Br frequencies grouped around 60 MHz. The � → 3/2 transitions of 127I in the iodides are in the region of 76 MHz. The diammine compounds ZnBr2,2NH3 and ZnI2,2NH3 have frequencies close to the mean values for the ZnBr42- and ZnI42- ions respectively, but in the hydrates ZnCl2,l⅓H2O,ZnBr2,2H2O, β-KZnBr3,2H2O, and KZnI3,2H2O the halogen frequencies are increased. N.q.r. and X-ray data are also reported for the compound Cs3CuCl5, formed by quenching the melt. This compound slowly disproportionates at room temperature into Cs2CuCl4 and CsCl.

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