Thermodynamics of organic azides: Experimental vapor pressures of organic polyazido compounds measured with the transpiration method

•Vapor pressures of organic polyazido compounds measured with transpiration method.•Vaporization of a compound containing geminal azides investigated for the first time.•Derived molar enthalpies and entropies of vaporization at 298.15 K reported. In this study experimental vapor pressures of several organic azides including 1,3-diazidopropan-2-ol (1,3-DAP, CAS: 57011-48-0), 2,3-diazidopropan-2-ol (2,3-DAP, CAS: 67880-10-8) and geminal diazido group containing 1,3‑diethyl-2,2-diazidomalonate (DE-DAM, CAS: 168207-98-5) were measured for the first time using the transpiration method. The study provides p-T fitting equations and corresponding molar enthalpies of vaporization, adjusted to 298.15 K: (72.6 ± 0.5) kJ mol−1 for 1,3-DAP, (75.2 ± 0.6) kJ mol−1 for 2,3-DAP and (76.0 ± 1.1) kJ mol−1 for DE-DAM.