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The Conformations and Vibrational Spectra Including Matrix Isolation of 1,3-Dibromo-2,2-dimethylpropane

A. Gatial ; Department of Chemistry, University of Oslo, 0315 Oslo 3, Norway
P. Klaeboe ; Department of Chemistry, University of Oslo, 0315 Oslo 3, Norway
C. J. Nielsen ; Department of Chemistry, University of Oslo, 0315 Oslo 3, Norway
D. L. Powell ; Department of Chemistry, University of Oslo, 0315 Oslo 3, Norway


Puni tekst: engleski pdf 6.166 Kb

str. 375-389

preuzimanja: 175

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Sažetak

The IR spectra of 1,3-Dibromo-2,2-dimethylpropane as a liquid
and as two crystalline solids obtained at low temperature and at
high pressure were recorded. Additional IR spectra of this com-.
pound, matrix isolated in argon and nitrogen at 14 K, were
obtained using nozzle temperatures of 300, 450 and 700 K. Raman
spectra including polarization measurements were recorded at
various temperatures between 340 and 230 K. Crystalline solids
were obtained by freezing the liquid and by shock freezing the
vapour at 85 K with subsequent annealing.The GG and AG conformes were present in the low temperature and in the high pressure crystals, respectively, and the enthalpy differences were 5.6 (liquid) and 4.2 kJ mol-1 (vapour) with GG being the more stable. An additional conformer AA was detected in the liquid and in the matrix isolated spectra, being approximately 6.4 and 6.5 kJ mol-1 less stable than GG in the liquid and vapour, respectively, Vibrational assignments of the GG and AG spectra are presented, supported by a normal coordinate analysis.

Ključne riječi

Hrčak ID:

175915

URI

https://hrcak.srce.hr/175915

Posjeta: 327 *