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

Abstract

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 U^ρ_exp=−471±16 kJ mol⁻¹ (−4.88±0.17 eV molecule⁻¹).