Photocatalytic and adsorption properties of TiO-pillared montmorillonite obtained by hydrothermally activated intercalation of titanium polyhydroxo complexes.

We report on a new approach for the synthesis of TiO-pillared montmorillonite, where the pillars exhibit a high degree of crystallinity (nanocrystals) representing a mixture of anatase and rutile phases. The structures exhibit improved adsorption and photocatalytic activity as a result of hydrothermally activated intercalation of titanium polyhydroxo complexes (i.e.

Thermal Emission of Alkali Metal Ions from Al-Pillared Montmorillonite Studied by Mass Spectrometric Method.

The thermal emission of alkali metal ions from Al-pillared montmorillonite in comparison with its natural form was studied by mass spectrometry in the temperature range 770-930 K. The measurements were carried out on a magnetic mass spectrometer MI-1201. For natural montmorillonite, the densities of the emission currents () decrease in the mass spectrum in the following sequence (T = 805 K, A/cm): K (4.

Anomeric effect in N-azidomethylpyrrolidine: gas-phase electron diffraction and theoretical study.

Gas-phase electron-diffraction data and high-level quantum chemical calculations have been used to study the conformational behaviour of N-azidomethylpyrrolidine. The two most stable conformers with a relative abundance of about 80% at 298 K possess gauche orientation of the azidomethyl group around the C-N(pyr) bond (C-N(azido)gauche with respect to the endocyclic N(pyr)-C bond). This orientation is a strong manifestation of an anomeric effect.

[Organization of emergency surgery by acute diseases of abdomen in Moscow].

Results of emergency surgical aid by acute diseases of abdomen rendered in 39 Moscow hospitals were analyzed. Results of surgical service were analyzed generally during the period of 1993-2007, and in comparison according to 5-year intervals: 1993-1997; 1998-2002 and 2003-2007 years. Analysis demonstrated the progressive decrease in general lethality, as well as postoperative lethality.

Flexibility of the saturated five-membered ring in 2,5-pyrrolidinedione (succinimide): electron diffraction and quantum-chemical studies with use of vibrational spectroscopy data.

The flexibility of succinimide molecule has been studied for the first time by quantum-chemical (at the MP2 level with up to the 6-311G(3df,2p) basis sets) and gas-phase electron diffraction (GED) methods using vibrational spectroscopy data from literature. The analysis of vibrational spectra, performed for the molecular model of C(2v) symmetry (predicted by high-level ab initio calculations) using the scaling procedure, has shown that the two out-of-plane ring motions, that is, ring-bending and ring-twisting, are practically pure modes of different symmetry types and can be considered separately. The one-dimensional potential curves for the ring-bending and ring-twisting vibrations calculated at the MP2(full)/6-311G(3df,2p) level could be approximated by harmonic and anharmonic functions, respectively.