Tetrazinodiheteroarene: ‘Charge‐Transfer’‐Komplexbildung mit Akzeptorverbindungen

Charge‐Transfer Complexes of Tetrazinodiheteroarenes with Acceptor Compounds The formation of charge‐transfer complexes and radical‐ion pairs of donor compounds 1 – 6 with acceptor compounds 7 – 12 has been investigated by means of VIS/NIR‐spectroscopic methods. The equilibrium constants K CT up to 1100 M ‐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 voltammetric redox‐potentials E 1/2 .