Stoichiometric and Nonstoichiometric Hydrates of Brucine

Stoichiometric and Nonstoichiometric Hydrates of Brucine

The complex interplay of temperature and water activity (aw) / relative humidity (RH) on the solid form stability and transformation pathways of three hydrates (HyA, HyB and HyC), an isostructural dehydrate (HyAdehy ), an anhydrate (AH) and amorphous brucine has been elucidated and the transformation enthalpies quantified. The dihydrate (HyA) shows a non-stoichimetric (de)hydration behavior at ...

Supramolecular Organization of Nonstoichiometric Drug Hydrates: Dapsone

The observed moisture- and temperature dependent transformations of the dapsone (4,4'-diaminodiphenyl sulfone, DDS) 0. 33-hydrate were correlated to its structure and the number and strength of the water-DDS intermolecular interactions. A combination of characterization techniques was used, including thermal analysis (hot-stage microscopy, differential scanning calorimetry and thermogravimetric...

Two pseudopolymorphic hydrates of brucine: brucine-water (1/4) and brucine-water (1/5.25) at 130 K.

Molar Volume, Ionic Radii in Stoichiometric and Nonstoichiometric Metal Oxides

Metal oxides are a group of compounds that are now intensively studied because of their wide use in modern ceramic materials, composites, nano-composites, etc., with new special properties. Many oxides are used as electronic materials for their electrical, magnetic and optical properties. The mechanisms of corrosion of metals and their alloys, as well as the mechanism of reduction in metallurgi...

Nitrogen Partial Pressure of Stoichiometric and Nonstoichiometric Titanium, Vanadium and Niobium Nitrides and Carbonitrides

A method is proposed for calculating the nitrogen equilibrium partial pressure pN2 of stoichiometric and nonstoichiometric nitrides MNy and carbonitrides MCyN1ÿy (M ˆ Ti, Zr, Hf, V, Nb, Ta) with B1(NaCl)-type structure. Analytic forms are derived for the composition, nonstoichiometry, and temperature dependences of the nitrogen partial pressure of the afore-mentioned compounds. The partial pres...