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An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
A. Goel, A. S. N. Murthy and C. N. R. Rao, J. Chem. Soc. D, 1970, 423 DOI: 10.1039/C29700000423
The solvolytic disproportionation of non-stoichiometric PrOχ and TbOχ in acid solutions to produce higher oxides has been investigated. Some new non-stoichiometric phases have been reported. A number of interesting features of the non-stoichiometric rare earth oxides have been discussed and the need for a satisfactory structural model has been pointed out.
Soft chemical routes are employed effectively for the synthesis of nanocrystals of semiconductor materials. Several methods have been developed for the synthesis of multi-walled carbon nanotubes (MWNTs) and single-walled carbon nanotubes (SWNTs) and specially noteworthy are the precursor route and nebulized spray pyrolysis for the synthesis of MWNTs and junction nanotubes. Nanotubes of inorganic layered materials are obtained by ingenious chemical methods. Nanowires of inorganic materials can be synthesized not only by high-temperature methods such as the carbon-assisted route but also by soft chemical routes.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
A three-dimensional metal selenate of the formula [C2N2H10][La2(SeO4)4(H2O)3]·H2O, comprising La2Se4 building units and possessing 12-membered channels, has been prepared in an acidic medium under hydrothermal conditions.
Several amine phosphates have been synthesized and their structures elucidated by single crystal X-ray diffraction. The amine phosphates, on reaction with metal ions, give rise to a large variety of metal phosphate structures incorporating the amine molecules, thus providing a facile route to the open-framework materials. By means of such a soft chemical method, it has been possible to generate novel architectures, typical of these being a cloverite structure, a new chlorophosphate incorporating chlorine as part of the framework, and a four-membered ring monomeric phosphate. The studies indicate that amine phosphates are likely to act as intermediates in the formation of open-framework metal phosphates. The transformation of the monomeric zinc phosphate to an open-framework layered structure on heating it in water suggests the four-membered ring to be the basic building unit.
For N2 on a clean Fe surface, the adsorbed precursor in a parallel orientation becomes predominant around 110 K, while at lower temperatures it coexists with a weakly adsorbed species. On a Ba-promoted Fe surface, however, N2 is present exclusively in the precursor state in the temperature range 80–150 K following moderate exposure. Besides exhibiting a low N-N stretching frequency of 1530 cm−1, the precursor shows a clear separation between the 5σ and 1π levels in the UPS; the precursor dissociates to give a nitridic species around 160 K.
No abstract is provided for this article.
No abstract is provided for this article.
Both superoxo and peroxo species are formed when oxygen is adsorbed on a polycrystalline Ag surface as evidenced by the characteristic OO stretching frequencies in the EEL spectra. Based on temperature-variation studies of the vibration bands in the EELS and of the O(1s) core level peaks in the XPS, characteristic O(1s) binding energies are assigned to the two molecular species; the superoxo species is associated with a significantly higher binding energy as expected. The superoxo species appears to be relatively less thermally stable than the peroxo species, being associated with a ∼ 1300 cm−1 stretching vibration, the highest OO stretching frequency observed so far due to a chemisorbed species.
