Thermochemical properties of 2,6-diamino-3,5-dinitropyrazine-1-oxide in dimethyl sulfoxide and N -methyl pyrrolidone

The molar enthalpies of dissolution for 2,6-diamino-3,5-dinitropyrazine-1-oxide (LLM-105) in dimethyl sulfoxide (DMSO) and N -methyl-2-pyrrolidone (NMP) were measured using a RD496-2000 Calvet microcalorimeter at 298.15 K under atmospheric pressure. Empirical formulae for the calculation of the molar enthalpies of dissolution (Δ diss H ), relative partial molar enthalpies (Δ diss H partial ) and relative apparent molar enthalpies (Δ diss H apparent ) were obtained from the experimental data of the dissolution processes of LLM-105 in DMSO or NMP. Furthermore, the corresponding kinetic equations describing the two dissolution processes were d α /d t = 10 −2.37 (1 − α ) 0.47 for the dissolution of LLM-105 in DMSO, and d α /d t = 10 −2.38 (1 − α) 0.42 for the dissolution of LLM-105 in NMP.