Halogan nuclear quadrupole resonance in tetrahedral halo complexes of zinc

1971 ◽  
Vol 24 (7) ◽  
pp. 1315 ◽  
Author(s):  
DE Scaife
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Site Symmetry ◽  
Mean Frequency ◽  
Quadrupole Resonance ◽  
Resonance Data ◽  
Unknown Structure ◽  
Nuclear Quadrupole

Halogen nuclear quadrupole resonance data are presented for a number of compounds containing tetrahedral ZnX42- ions, where X = Cl, Br, and I. Characteristic mean frequencies are: for 35Cl in ZnCl42- 8.9 MHz ; for 81Br in ZnBr42- 60 MHz; and for 127I in ZnI42- 75 and 150 MHz. The number and relative intensities of the resonances for any compound is found to be a useful indication of the site symmetry of the ZnX42- ion, and compounds of unknown structure are examined in this light. 35Cl data are also presented for Cs2CuCl4, which has a mean frequency of 10.6 MHz at 298�K.

Vibrational spectra of crystalline malononitrile

1976 ◽  
Vol 54 (20) ◽  
pp. 3293-3302 ◽  
Author(s):  
R. Savoie ◽  
R. Brousseau ◽  
C. Nolin
Keyword(s):  
Phase I ◽  
Metastable Phase ◽  
Phase Iii ◽  
Site Symmetry ◽  
Monoclinic System ◽  
X Ray ◽  
Data Phase ◽  
Quadrupole Resonance ◽  
Resonance Data ◽  
Nuclear Quadrupole

The infrared and Raman spectra of the four solid phases of malononitrile have been recorded. The crystal structures of these solids are now relatively well established from the present results and from previous X-ray and nuclear quadrupole resonance data. Phase I belongs to the P21/n space group of the monoclinic system, with four molecules per unit cell. In phase II, the molecules occupy two sets of general positions in a crystal of P21 symmetry. The molecular site symmetry is Cs in phase III which is highly symmetric. The structure of the low-temperature metastable phase IV appears to be very similar to that of phase I.

Chlorine nuclear quadrupole resonance in mercury chlorides and complex chlorides

1971 ◽  
Vol 24 (9) ◽  
pp. 1753 ◽  
Author(s):  
DE Scaife
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Covalent Bonding ◽  
Distorted Octahedral ◽  
Resonance Frequencies ◽  
Quadrupole Resonance ◽  
Unknown Structure ◽  
Linear Molecules ◽  
Nuclear Quadrupole ◽  
Solid Compounds

Chlorine nuclear quadrupole resonance frequencies are reported for solid compounds of known structure containing linear molecules HgCl2 and Hg2Cl2, approximately trigonal HgCl3-, and a variety of distorted octahedral forms including NH4HgCl3, CsHgCl3, and K2HgCl4,H2O. Compounds of unknown structure of the type (cation+)HgCl3, (cation+)2HgCl4, (cation+)Hg2Cl5, (cation+)2Hg9Cl20, and (cation+)4HgCl6 have also been studied. There are clear correlations between observed n.q.r. frequencies and Hg-Cl infrared stretching frequencies and bond distances. These correlations show the dependence of the degree of covalent bonding in the Hg-Cl bond with distance. The n.q.r. data confirm that many of the complex chlorides of mercury are built up by the joining of octahedral HgCl6 units, distorted in such a way as to preserve to varying extents the identity of the HgCl2 molecule. ��� Predictions of the structures are made for some complex chlorides of unknown structure, and the role of bridging in building up the compounds is discussed in terms of observed n.q.r. data for bridging chlorines.

Preparation, Raman, and nuclear quadrupole resonance data for the complex SCl3+AlCl4-

1970 ◽  
Vol 74 (18) ◽  
pp. 3385-3387 ◽  
Author(s):  
Harold E. Doorenbos ◽  
John Cyril Evans ◽  
R. O. Kagel
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Quadrupole Resonance ◽  
Resonance Data ◽  
Nuclear Quadrupole

scholarly journals Correlation between Structural, Infrared and Nuclear Quadrupole Resonance Data of Iodates

1996 ◽  
Vol 51 (5-6) ◽  
pp. 667-671 ◽  
Author(s):  
A.M. Petrosyan ◽  
V.A. Shishkin
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Organic Cations ◽  
Quadrupole Resonance ◽  
Resonance Data ◽  
Nuclear Quadrupole

Abstract The peculiarities of the structure and the IR and NQR spectra of acid iodates and pyroiodates which contain the I2O5 group are reported. Based in this, the results for several iodates that contain organic cations are considered.

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