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Heat of Formation of the Difluoromethylene Radical

Naturevolume 192pages866867 (1961) | Download Citation



ATKINSON1 has accounted for the products of the mercury photosensitized decomposition of tetrafluoroethylene by supposing that the excited mercury atoms (Hg 3P1) are able to decompose tetrafluoroethylene to give two difluoromethylene radicals. This requires that the dissociation energy of the carbon–carbon bond in tetrafluoroethylene is equal to, or less than, 112 kcal./mole. Since this value is significantly smaller than the lower (125–30 kcal./mole)2 of many values suggested for the dissociation energy of the carbon–carbon bond in ethylene, it is of some interest to obtain independent estimates of the heat of formation of the difluoromethylene radical.

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  1. 1

    Atkinson, B., J. Chem. Soc., 2684 (1952).

  2. 2

    Cottrell, T. L., Bond Dissociation Energies, second ed. (Butterworths, London, 1956).

  3. 3

    Beynon, J. H., Lester, G. R., and Williams, J. Phys. Chem., 63, 1861 (1959).

  4. 4

    Bralsford, R., Harris, P. V., and Price, W. C., Proc. Roy. Soc., A, 258, 454 (1960).

  5. 5

    Good, W. D., Douslin, D. R., Scott, D. W., Dawson, J. P., and Waddington, G., J. Phys. Chem., 63, 1133 (1959).

  6. 6

    Scott, D. W., McCullough, J. P., Good, W. D., Messerley, J. F., Pennington, R. E., Kinchenloe, T. C., Hossenlop, J. A., Douslin, D. R., and Waddington, G., J. Amer. Chem. Soc., 78, 5457 (1956).

  7. 7

    Neugabauer, G. A., and Margrave, J. L., J. Phys. Chem., 60, 1318 (1956).

  8. 8

    Scott, D. W., Douslin, D. R., Messerley, J. F., Todd, S. S., Hossenlop, J. A., Kinchenloe, T. C., and McCullough, J. P., J. Amer. Chem. Soc., 81, 1015 (1959).

  9. 9

    Atkinson, B., and Atkinson, V. A., J. Chem. Soc., 2086 (1957).

  10. 10

    Atkinson, B., and Trenwith, A. B., J. Chem. Soc., 2082 (1953).

  11. 11

    Duus, H. C., Indust. Eng. Chem., 47, 1445 (1955).

  12. 12

    Reed, J. F., and Rabinowitch, B. S., J. Phys. Chem., 61, 598 (1957).

  13. 13

    Mann, D. E., and Potocki, R. W., N.B.S. Rep., quoted in ref. 15.

  14. 14

    Reed, J. F., and Snedden, W., Trans. Farad. Soc., 54, 309 (1957).

  15. 15

    Margrave, J. L., J. Chem. Phys., 31, 1432 (1959).

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  1. Chemistry Department, University of Birmingham

    • J. R. MAJER
    •  & C. R. PATRICK


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