... References. 1. Matsubara, Y.; Horikawa, A.; Tateishi, K.; Yoshida, Z. to be submitted. 2. Origin of the green color was proved to be due to the 1:1 charge transfer complex (λmax 820 nm, log ε 1.02) formation between 3a and TCNE by continuous variation method using UV-vis spectroscopy for 3a - TCNE system in benzene. 3. G Tosi, P Bruni, L Cardellini, G Bocelli; Gazz. Chim. Ital., 114 (1984), p. 111. 4. ...