Synthesis, Structures, and Electrochemical Properties of Bis‐ and Tetrakis(diphenylphosphino)tetrathiafulvalenes Extended with an Anthraquinoid Spacer

Bis- and tetrakis(diphenylphosphino)tetrathiafulvalenes extended with an anthraquinoid spacer were successfully synthesized. X-ray structure analysis revealed that the phosphorus atoms adopt typical distorted tetrahedral geometry. Their average C−P−C angles phosphorus−carbon distances resemble those of diphenylphosphino-substituted TTF derivatives. The cyclic voltammograms consisted one pair irreversible, simultaneous two-electron transfer waves. A combination voltammetry experiments DFT calculations suggested coexistence two different reduction processes depending on scan rate.