Can. J. Chem. 52.3814 (1 974).The phenoxachalcogenines have been studied as donors toward tetracyanoethylene (TCNE) as the acceptor. It was found that the thermodynamic values for the interactions show no significant trends when the chalcogenine atom is varied from Te to Se to S to 0. For the four 1 : 1 complexes studied, the following average values for the thermodynamic properties here obtained at 20 ' C (the total range for each quantity is given in parentheses):

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