127I Mössbauer studies of some fluorosubstituted organo iodine compounds

Autor:	T. Darrah Thomas, M. S. Lazarus
Rok vydání:	1974
Předmět:	Coupling constant General Physics and Astronomy chemistry.chemical_element Charge (physics) Iodine Charge-transfer complex Spectral line Nuclear magnetic resonance chemistry Mössbauer spectroscopy Quadrupole Chlorine Physical chemistry Physical and Theoretical Chemistry
Zdroj:	The Journal of Chemical Physics. 60:4682-4689
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.1680968
Popis:	From the measured 127I Mossbauer spectra, we have determined the isomer shift, quadrupole coupling constant, and recoilless fraction for CH3I, CF3I, C6H5I, o‐, m‐, and p‐C6H4FI, and C6F5I. From relative intensities of the peaks, there is evidence for either orientation or Goldanskii‐Karyagin effects in CH3I, CF3I, and φI. The isomer shifts and quadrupole coupling constants give values for the numbers of p and s holes, from which the charge and hybridization of iodine in these compounds is calculated. Except for C6F5I, the charges correlate well with the pKa of corresponding carboxylic acids. It is suggested that the anomalous behavior of this compound arises from the formation of a charge transfer complex in the solid. From a comparison of NQR and Mossbauer data for CI4 and CF3I, an explanation is suggested for the anomalous decrease of chlorine NQR frequencies in the series of compounds CFn Cl4−n (n = 0→3). The problem of deriving meaningful Mossbauer parameters from complex spectra taken with thick abso...
Databáze:	OpenAIRE
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