Isomorphism and disorder in o-chlorohalobenzenes studied by NQR
In this work we present experimental results that allow to characterize different solid modifications found in o-chlorohalobenzenes. Three disordered phases have been found in o-chlorobromobenzene. The stable phase at high temperature (phase I) is also obtained by quenching the sample at 77 K. Slow cooling allow to obtain the low temperature phase III which, on heating, transforms to phase II at 183 K and this, in turns, transforms to phase I at T210 K. The disorder evidenced through the Nuclear Quadrupole Resonance spectra, is attributed to a random occupation of chlorine and bromine sites. In all phases there is evidence of molecular reorientations out of the benzene ring plane around the pseudosymmetry axis between the atoms of Cl and Br. In o-chlorofluorobenzene two phases have been found depending on the cooling rate. One phase is disordered due to the random exchange of the occupation of Cl and F sites. In this case, there is also evidence of molecular reorientations out of the benzene ring plane, but in this case the reorientation is around the pseudo-symmetry axis that pass through the C?Cl bonds. Comparisons with the behavior of o-dichlorobenzene are also made.
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Subjects: | 35Cl NQR characterization of different solid phases in o-chlorohalobenzenes, Experimental evidence of orientational disorder, Experimental evidence of out of plane molecular reorientations, Isomorphism, |
Online Access: | http://hdl.handle.net/11086/28148 https://doi.org/10.1016/j.ssnmr.2013.12.002 https://doi.org/10.1016/j.ssnmr.2013.12.002 |
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dig-unc-ar-11086-281482022-10-13T11:07:58Z Isomorphism and disorder in o-chlorohalobenzenes studied by NQR Pérez, Silvina C. Wolfenson, Alberto Zuriaga, Mariano 35Cl NQR characterization of different solid phases in o-chlorohalobenzenes Experimental evidence of orientational disorder Experimental evidence of out of plane molecular reorientations Isomorphism In this work we present experimental results that allow to characterize different solid modifications found in o-chlorohalobenzenes. Three disordered phases have been found in o-chlorobromobenzene. The stable phase at high temperature (phase I) is also obtained by quenching the sample at 77 K. Slow cooling allow to obtain the low temperature phase III which, on heating, transforms to phase II at 183 K and this, in turns, transforms to phase I at T210 K. The disorder evidenced through the Nuclear Quadrupole Resonance spectra, is attributed to a random occupation of chlorine and bromine sites. In all phases there is evidence of molecular reorientations out of the benzene ring plane around the pseudosymmetry axis between the atoms of Cl and Br. In o-chlorofluorobenzene two phases have been found depending on the cooling rate. One phase is disordered due to the random exchange of the occupation of Cl and F sites. In this case, there is also evidence of molecular reorientations out of the benzene ring plane, but in this case the reorientation is around the pseudo-symmetry axis that pass through the C?Cl bonds. Comparisons with the behavior of o-dichlorobenzene are also made. http://www.sciencedirect.com/science/article/pii/S0926204013000933 publishedVersion Fil: Pérez, Silvina C. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Fil: Pérez, Silvina C. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Física Enrique Gaviola; Argentina. Fil: Pérez, Silvina C. Universidad Nacional de Córdoba. Instituto de Física Enrique Gaviola; Argentina. Fil: Wolfenson, Alberto. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Fil: Wolfenson, Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Física Enrique Gaviola; Argentina. Fil: Wolfenson, Alberto. Universidad Nacional de Córdoba. Instituto de Física Enrique Gaviola; Argentina. Fil: Zuriaga, Mariano. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Fil: Zuriaga, Mariano. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Física Enrique Gaviola; Argentina. Fil: Zuriaga, Mariano. Universidad Nacional de Córdoba. Instituto de Física Enrique Gaviola; Argentina. Física de los Materiales Condensados 2022-08-11T18:27:09Z 2014 article http://hdl.handle.net/11086/28148 https://doi.org/10.1016/j.ssnmr.2013.12.002 https://doi.org/10.1016/j.ssnmr.2013.12.002 eng Attribution-NonCommercial-NoDerivatives 4.0 International restrictedAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ Impreso; Electrónico y/o Digital ISSN: 0926-2040 |
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35Cl NQR characterization of different solid phases in o-chlorohalobenzenes Experimental evidence of orientational disorder Experimental evidence of out of plane molecular reorientations Isomorphism 35Cl NQR characterization of different solid phases in o-chlorohalobenzenes Experimental evidence of orientational disorder Experimental evidence of out of plane molecular reorientations Isomorphism |
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35Cl NQR characterization of different solid phases in o-chlorohalobenzenes Experimental evidence of orientational disorder Experimental evidence of out of plane molecular reorientations Isomorphism 35Cl NQR characterization of different solid phases in o-chlorohalobenzenes Experimental evidence of orientational disorder Experimental evidence of out of plane molecular reorientations Isomorphism Pérez, Silvina C. Wolfenson, Alberto Zuriaga, Mariano Isomorphism and disorder in o-chlorohalobenzenes studied by NQR |
description |
In this work we present experimental results that allow to characterize different solid modifications found in o-chlorohalobenzenes. Three disordered phases have been found in o-chlorobromobenzene. The stable phase at high temperature (phase I) is also obtained by quenching the sample at 77 K. Slow cooling allow to obtain the low temperature phase III which, on heating, transforms to phase II at 183 K and this, in turns, transforms to phase I at T210 K. The disorder evidenced through the Nuclear Quadrupole Resonance spectra, is attributed to a random occupation of chlorine and bromine sites. In all phases there is evidence of molecular reorientations out of the benzene ring plane around the pseudosymmetry axis between the atoms of Cl and Br. In o-chlorofluorobenzene two phases have been found depending on the cooling rate. One phase is disordered due to the random exchange of the occupation of Cl and F sites. In this case, there is also evidence of molecular reorientations out of the benzene ring plane, but in this case the reorientation is around the pseudo-symmetry axis that pass through the C?Cl bonds. Comparisons with the behavior of o-dichlorobenzene are also made. |
format |
article |
topic_facet |
35Cl NQR characterization of different solid phases in o-chlorohalobenzenes Experimental evidence of orientational disorder Experimental evidence of out of plane molecular reorientations Isomorphism |
author |
Pérez, Silvina C. Wolfenson, Alberto Zuriaga, Mariano |
author_facet |
Pérez, Silvina C. Wolfenson, Alberto Zuriaga, Mariano |
author_sort |
Pérez, Silvina C. |
title |
Isomorphism and disorder in o-chlorohalobenzenes studied by NQR |
title_short |
Isomorphism and disorder in o-chlorohalobenzenes studied by NQR |
title_full |
Isomorphism and disorder in o-chlorohalobenzenes studied by NQR |
title_fullStr |
Isomorphism and disorder in o-chlorohalobenzenes studied by NQR |
title_full_unstemmed |
Isomorphism and disorder in o-chlorohalobenzenes studied by NQR |
title_sort |
isomorphism and disorder in o-chlorohalobenzenes studied by nqr |
url |
http://hdl.handle.net/11086/28148 https://doi.org/10.1016/j.ssnmr.2013.12.002 https://doi.org/10.1016/j.ssnmr.2013.12.002 |
work_keys_str_mv |
AT perezsilvinac isomorphismanddisorderinochlorohalobenzenesstudiedbynqr AT wolfensonalberto isomorphismanddisorderinochlorohalobenzenesstudiedbynqr AT zuriagamariano isomorphismanddisorderinochlorohalobenzenesstudiedbynqr |
_version_ |
1756009602345861120 |