Direct Evaluation of the Charge Transfer in the Tetrathiafulvalene-Tetracyanoquinodimethane (TTF-TCNQ) Complex at 100°K by Numerical Integration of X-Ray Diffraction Amplitudes

A numerical charge integration procedure has been applied to diffraction data of TTF-TCNQ (tetrathiafulvalene-tetracyanoquinodimethane) measured at 100^∘{}K. The results indicate an average charge transfer of (0.48-0.60) ±{} 0.15 electrons from a TTF to a TCNQ molecule.