A Study of the Donor Properties of the Phenoxachalcogenines.: I. Tetracyanoethylene and Chloranil as Acceptors

Abstract

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):

Intermolecular charge-transfer complexes of macrocyclic polyethers with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone

“…8 We believe that the two assumptions in this procedure i.e., that the extifiction coefficient is independent of temperature and that the absorbance is directly proportional to the concentration of the complex, are valid in most of the complexing systems. The present results are analyzed by using a modified method of Heller et a1.…”

“…7 In view of the low magnitudes of K obtained for the interaction of crown ethers with similar acceptors, a careful choice of method is mandatory. The present results are analyzed by using a modified method of Heller et al 8 We believe that the two assumptions in this procedure i.e., that the extinction coefficient is independent of temperature and that the absorbance is directly proportional to the (1 X 10"3 M) with increasing addition of the following concentrations of ether: (2) 2.0 X 10"2 M, (3) 4.0 X 10"2 M, (4) 5.0 X 10'2 M, (5) 7.0 X 10'2 M, and (6) 9 X 10'2 M. concentration of the complex, are valid in most of the complexing systems. However, the major source of error involved in the evaluation of K and ec by this method is being circumvented by the following modified version of data treatment.…”