The enthalpy of formation and the experimental crystal binding energy of tetrathiofulvalenium 7,7,8,8-tetracyanoquinodimethanide (TTF TCNQ)

By rotating-bomb and static-bomb combustion calorimetry, the standard enthalpies of formation at 298.15 K were measured for TTF (290.83±1.73 kJ mol−1), TCNQ (644.94±0.74 kJ mol−1), TTF+0.59TCNQ−0.59(918.37±2.05 kJ mol−1), and TMPD+TCNQ−(662.47±1.85 kJ mol−1). The inferred experimental crystal binding energy for the organic metal TTF+0.59 TCNQ−0.59 is Uρexp=−471±16 kJ mol−1 (−4.88±0.17 eV molecule−1).