Solid–Liquid Phase Equilibrium of Phosphoramidic acid, <i>N</i>,<i>N</i>′‑1,2-Ethanediylbis‑<i>P</i>,<i>P</i>,<i>P</i>′,<i>P</i>′‑tetraphenyl Ester in Selected Solvents

Phosphoramidic acid, <i>N</i>,<i>N</i>′-1,2-ethanediylbis-<i>P</i>,<i>P</i>,<i>P</i>′,<i>P</i>′-tetraphenyl ester (PAETE) was prepared and characterized by elemental analysis (EA), mass spectra (MS), infrared spectroscopy (IR), and nuclear magnetic resonance (NMR). The thermostability of PAETE was measured via thermogravimetric analysis (TGA). The melting temperature and the fusion enthalpy of PAETE were evaluated by differential scanning calorimeter (DSC). The solubilities of PAETE in ten selected solvents were obtained using a gravimetric method. The experimental data were well correlated by the Buchowski–Ksiazczak (<i>λh</i>), Scatchard–Hildebrand, modified Apelblat model, and the ideal equations. The solubility parameter of PAETE was estimated by the Scatchard–Hildebrand Model. The dissolution enthalpy and entropy of PAETE in the ten selected solvents were also calculated by the modified Apelblat model

A Highly Symmetric Ionic Crystal Constructed by Polyoxoniobates and Cobalt Complexes for Preferential Water Uptake over Alcohols

An ionic crystal assembled by PNb₁₂O₄₀(VO)₆ and tris­(1,2-diaminopropane)­cobalt complexes was hydrothermally isolated and structurally characterized by routine methods. The compound exhibits three-dimensional channels with a pore size of 3.68 Å × 2.30 Å and composed of hydrophilic oxygen atoms of polyanions and hydrophobic −CH₃ groups of 1,2-diaminopropane ligands. With increasing vapor pressure, the compound shows preferable adsorption toward water over alcohols, and a gate-opening behavior was deduced from the water adsorption isotherm

Solubilities of Phosphoramidic Acid, <i>N</i>‑(phenylmethyl)‑, Diphenyl Ester in Selected Solvents

Phosphoramidic acid, <i>N</i>-(phenylmethyl)-, diphenyl ester (PANDE) was synthesized, and its thermostability was measured by thermogravimetric analysis. The melting temperature and the fusion enthalpy of PANDE were evaluated by a differential scanning calorimeter. The solubilities of PANDE in chloroform, tertrahydrofuran, dichloromethane, acetone, methyl acetate, ethyl acetate, acetonitrile, methanol, and toluene were measured by a gravimetric method at different temperatures. The solubilities of PANDE in different solvents at low temperatures are in the order of chloroform > tetrahydrofuran > dichloromethane > acetone > methyl acetate > ethyl acetate > acetonitrile > methanol > toluene. At higher temperatures the order is the same except that acetonitrile now becomes the least soluble. The solubility data of PANDE in nine selected solvents were well fitted by the Wilson, nonrandom two-liquid (NRTL), and universal quasichemical equations. The Wilson model and the NRTL model show better agreement in general. Finally, the solubility parameters of PANDE were evaluated by the Scatchard–Hildebrand model, and meanwhile, the standard dissolution enthalpy, the standard dissolution entropy, and the standard molar Gibbs energy of PANDE in the selected solvents were also calculated by the van’t Hoff model and the Gibbs–Helmholtz equation. The results show that the dissolution process is endothermic and entropy-driven