Electrochromic and optical study of atmospheric pressure chemical vapour deposition MoO3-Cr2O3 films.

Electrochromism (EC) is a phenomenon in which materials are able to change their optical properties in a reversible and persistent way under the action of a voltage pulse. The studied MoO3-Cr2O3 films are obtained by atmospheric pressure CVD. Mixing MoO3 films with Cr2O3 is expected to enhance optical transparency and to modulate electrochromic properties of MoO3 films.

Biodegradable cross-linked prodrug of the bronchial dilator Vephylline. 2. Kinetics and quantum chemical studies on the release mechanism.

Experimental thermodynamics studies and quantum chemical reaction path calculations on the hydrolytic degradation of Poly-vephyllinemalate microspheres in acidic and basic media were performed. It was possible to make a conclusion on the release mechanism of free Vephylline as follows: a hydrolytic cleavage of the ester bonds between molecular fragments of R,S-malic acid takes place and leads to a soluble oligoester fraction. Then, further hydrolysis of the ester bonds between the xanthine fragment and R, S-malic acid leads to the release of Vephylline as free base.