A theory of the ring‐chain equilibrium in liquid selenium is presented which is mathe‐matically identical to our theory for polymer equilibrium in liquid sulfur. The numerical treatment is based on: (a) the entropy and enthalpy of the propagation reaction (Se n * + Se 8 ⇌ Se n +8 * , the asterisk denoting a diradical) which were calculated from values of the Se 8 concentrations in the liquid as given in the literature, and (b) the entropy and enthalpy of the initiation reaction (Se 8 ⇌ Se 8 * ) which were estimated by comparison to the sulfur values. The “transition” temperature for the appearance of polymer in the liquid state is calculated as 83°C. (134° below the melting point of selenium), and the chain length at the melting point is estimated as ca. 1300 Se 8 units.
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Eisenberg et al. (1960) studied this question.
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