Chlorine-35 qttadrupole relaxation and molecular motion in (Cl3PNR)2 crystals

Kibrik, G. E.; Kjuntsel, I.A.; Kozlov, E. S.; Mokeeva, V. A.; Soǐfer, G. B.

doi:10.1016/0022-2860(82)85168-5

Cited by 8 publications

(1 citation statement)

References 6 publications

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“…For 1, we had previously measured16 the temperature dependence of both the spectrum and the relaxation times of the 35Cl nuclei up to the sample melting point. 16 We established the existence of pseudorotation of the chlorine atoms in this compound and determined the corresponding activation energy (105 f 8 kJ mol-').…”

Section: Observation Of the Pseudorotation Effect In Solidsmentioning

confidence: 99%

NQR and NMR study of pseudorotation in solids

Kibrik

Kjuntsel

Kozlov

et al. 1985

Magnetic Reson in Chemistry

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Nuclear quadrupole resonance and nuclear magnetic resonance methods have been used to study the pseudorotation process in solids. In crystalline dimeric (Hal,PNR), phosphazo compounds, where Hal = CI or F, and R contains protons, the temperature dependences of the '%I, 9 and 'H spectra and the relaxation times indicate intramolecular exchange of the 'trigonal twist' type between one axial and two equatorial halogen atoms attached to the pentacoordinated phosphorus. The activation energy, E., for the exchange process is obtained from the T, temperature dependence of the 35Cl nuclei and from the T,, temperature dependence of the 9 and 'H nuclei. In the case of chlorinated phosphazo compounds, E. lies in the 59-105 kJ mol-' range, whereas in solid (F3PNCH3), E. is about 38 kJ m0l-l.

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Section: Observation Of the Pseudorotation Effect In Solidsmentioning

confidence: 99%

NQR and NMR study of pseudorotation in solids

Kibrik

Kjuntsel

Kozlov

et al. 1985

Magnetic Reson in Chemistry

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Polyhalogenalkoxy(aryloxy)chloro‐ and bromophosphoranes

Markovsky¹,

Kozlov²,

Shermolovich³

1991

Heteroatom Chemistry

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The data on the synthesis, stereochemistry, and molecular dynamics of alkoxy(ary1oxy)halogenphosphoranes of acyclic structure, as well as of halogenphosphoranes containing the pentacoordinate phosphorus atom in the 1,4,2-dioxophospholane cycle and the node of bicyclo[2.2.2]octane system, are systematized. The influence of spatial properties of polyhalogenalkyl substituents on thermal stability and structure of adducts from tris(po1yhalogenalkyI) phosphites with chlorine and bromine is ascertained. The eflect of the phosphorus atom inclusion into the cycle and node of the bicyclooctane system on its pentacoordinate state stability is investigated.

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G125 - G183

Chihara¹,

Nakamura²

Landolt-Börnstein - Group III Condensed Matter

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Chlorine-35 qttadrupole relaxation and molecular motion in (Cl3PNR)2 crystals

Cited by 8 publications

References 6 publications

NQR and NMR study of pseudorotation in solids

NQR and NMR study of pseudorotation in solids

Polyhalogenalkoxy(aryloxy)chloro‐ and bromophosphoranes

G125 - G183

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