Critical Evaluation: Diammonium hydrogenphosphate with Thiourea, Methionine, Triethylamine hydrochloride and Water (IUPAC SDS Volume 66)
9.2. (NH4)2HPO4-Organic Compound-H2O

Systems with diammonium hydrogenphosphate, oprganic compound and water.

The (NH4)2HPO4 - CS(NH2)2 - H2O system is described in two articles.2,3 The 298 K isotherm and the complete phase diagram are given. These data are consistent with each other, but no critical evaluation can be made because there are no other data available.
As far as similar systems containing diammonium hydrogenphosphate and an organic compound (which is both solid and water-soluble under ordinary room conditions) are concerned, there are two systems that have been studied: (a) the (NH4)2HPO4 - methionine - water system described by Beglov et al.;4 and (b) the (NH4)2HPO4 - (C2H5)3N·HCl - H2O system.1,5 No other independent data are available for these systems and, therefore, the information cannot be evaluated.

References:

1 Sosnina, O. E.; Volkov, A. A.; Uch. Zap. Perm. Gos. Univ., Ser. Khim. 1973, 289, 20.
2 Zakirov, B. S.; Tukhtaev, S.; Beglov, B. M.; Dokl. Akad. Nauk Uzb. SSR, 40 (1974).
3 Zakirov, B. S.; Tukhtaev, S.; Beglov, B. M.; Khaymov, B. M.; Dokl. Akad. Nauk Uzb. SSR, 31 (1977).
4 Beglov, B. M.; Zakirov, B. S.; Amilova, D. A.; Uzb. Khim. Zh.; 61 (1985).
5 Mazunin, S. A.; Sosnina, O. E.; Volkov, A. A.; Danina, T. L.; Termicheskiy Analiz i Fazovye Ravnovesiya, Perm, 79 (1985).