Charge‐Transfer Complexes of Tetrazinodiheteroarenes with Acceptor CompoundsThe formation of charge‐transfer complexes and radical‐ion pairs of donor compounds1–6with acceptor compounds7–12has been investigated by means of VIS/NIR‐spectroscopic methods. The equilibrium constantsKCTup to 1100M‐1 for the donor/acceptor couple dipyrido[1,2‐b:1,2′‐e][1,2,4,5]tetrazine (2)/ethylenetetracarbonitrile (11) and spectra of the CT complexes have been determined in 1,2‐dichloroethane solution at 25°. Results are discussed in relation to known CT‐complex properties and to voltammet