Iodine thermodynamic properties

Physical Properties. Sulfuryl chloride [7791-25-5] SO2CI2, is a colorless to light yellow Hquid with a pungent odor. Physical and thermodynamic properties are Hsted ia Table 7. Sulfuryl chloride dissolves sulfur dioxide, bromine, iodine, and ferric chloride. Various quaternary alkyl ammonium salts dissolve ia sulfuryl chloride to produce highly conductive solutions. Sulfuryl chloride is miscible with acetic acid and ether but not with hexane (193,194). 

The endothermic radical lO has also been studied in the gas phase the interatomic distance is 186.7 pm and the bond dissociation energy 175 20kJmol . It thus appears that, although the higher oxides of iodine are much more stable than any oxide of Cl or Br, nevertheless, lO is much less stable than CIO (p. 849) or BrO (p. 851). Its enthalpy of formation and other thermodynamic properties are A//f(298K) 175.1 kJmol", AGf(298 K) 149.8 kJmol-, 5°(298 K) 245.5 J K- mor . 

Thermodynamic properties for explosion calculations are presented for major organic chemical compounds. The thermodynamic properties include enthalpy of formation, Gibbs free energy of formation, internal energy of formation and Helmholtz free energy of formation. The major chemicals include hydrocarbon, oxygen, nitrogen, sulfur, fluorine, chlorine, bromine, iodine and other compound types. 

L. V. Gurvich, I. V. Veyts, and C. B. Alcock, Thermodynamic Properties of Individual Substances, Vol. 1 Elements Oxygen, Hydrogen (Deuterium, Tritium), Fluorine, Chlorine, Bromine, Iodine, Helium, Neon, Argon, Krypton, Xenon, Radon, Sulfur, Nitrogen, Phosphorus, and Their Compounds, Pt. 1 Methods and Computation, Hemisphere, New York, 1989. 

It must be kept in mind that the interference with redox properties alluded to above may be thermodynamic and not kinetic that is, the decreased reducibility when residues 67 or 59 are derivatized may arise not from modifications in the direct electron pathway but from a decrease in the reduction potential of the protein. Margalit and Schejter (230) have observed that the alkaline state IV of cytochrome c, with methionine-80 replaced by another ligand, has a reduction potential which is lowered from the normal - -260 mV to less than 90 mV at pH 11.2 or above. If similar factors are at work in the derivatives iodinated or nitrated at tyrosine-67, where the III to IV transition is lowered from pH... 

Uruska et al. [Ur 79a, b, 80] have determined the formation constants of DA molecular complexes (e.g. pyridine and pyridine derivates, with iodine) in a series of organic solvents using spectrometric and calorimetric measurements. The equilibrium constants and other thermodynamic data were found to correlate with solvent properties. 

Daisey, J.M. and Sonnessa, A.J. (1972) Thermodynamic and spectral properties of molecular complexes of iodine with several aminopyridines. J. Phys. Chem., 76, 1895-1901. 

Lux, R, Vilesov, F.I., Lopatin, S.N. et al. (1977) Studies of molecular complexes. Part 8 correlations between ionization energies of phosphoryl and thiophosphoryl donors, and thermodynamic and spectroscopic properties of their molecular complexes with iodine. Z Phys. Chem., 258, 593-600. 

Rooken, C. and Baumann, W. (1996) Charge-transfer complexes between iodine and substituted thioureas. Determination of thermodynamic and spectroscopic properties. Z. Naturforsch, Teil A, 51, 116-122. 

Lux, F., Paetzold, R., Danel, J. and Sobezyk, L. (1975) Molecular complexes. 7. Thermodynamic, spectroscopic, and dielectric properties of iodine complexes with triphenylphosphine oxide, sulfide, and selenide. J. Chem. Soc., Faraday Trans. 2, 71, 1610-1617. 

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