Crystal structure of 4-azidomethyl-6-tert-butyl-2H-chromen-2-one

MM would like to thank UGC, New Delhi, Government of India, for the award of a project under the head F. No. 41–920/2012(SR) (dated: 25-07-2012). In addition, SD is thankful to the Council of Scientific and Industrial Research, New Delhi, India, for financial assistance [grant No. 02 (0172)/13/EMRII].Peer reviewedPublisher PD

Amine Templated Zinc Phosphates Phases for Membrane Separations

This research is focused on developing inorganic molecular sieve membranes for light gas separations such as hydrogen recovery and natural gas purification, and organic molecular separations, such as chiral enantiomers. The authors focus on zinc phosphates because of the ease in crystallization of new phases and the wide range of pore sizes and shapes obtained. With hybrid systems of zinc phosphate crystalline phases templated by amine molecules, the authors are interested in better understanding the association of the template molecules to the inorganic phase, and how the organic transfers its size, shape, and (in some cases) chirality to the bulk. Furthermore, the new porous phases can also be synthesized as thin films on metal oxide substrates. These films allow one to make membranes from organic/inorganic hybrid systems, suitable for diffusion experiments. Characterization techniques for both the bulk phases and the thin films include powder X-ray diffraction, TGA, Scanning Electron Micrograph (SEM) and Electron Dispersive Spectrometry (EDS)

Structural and magnetic properties of some mixed metal oxides

SIGLEAvailable from British Library Document Supply Centre- DSC:D81562 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

The crystal structures of three clozapinium salts : different molecular configurations, and supramolecular assembly in one, two and three dimensions

MK thanks the UOM for research facilities and is also grateful to CPEPA, UGC, for the award of a JRF. JPJ acknowledges the NSF–MRI program (grant No. 1039027) for funds to purchase the X-ray diffractometer.The structures of three salts derived from clozapine, 8-chloro-11-(4-methyl­piperazin-1-yl)-5H-dibenzo[b,e][1,4]diazepine, are reported, namely, clo­za­pin­ium 3,5-di­nitro­benzoate dimethyl sulfoxide monosolvate, C18H20ClN4+·C7H3N2O6-·C2H6OS, (I), where the dimethyl sulfoxide component is disordered over two sets of atomic sites having occupancies 0.627 (2) and 0.373 (2); clo­za­pin­ium hydrogen maleate 0.21-hydrate, C18H20ClN4+·C4H3O4-·0.21H2O, (II), and clozapinium 2-hy­droxy­benzoate, C18H20ClN4+·C7H5O3-, (III). In all three salts, the protonation site is the methyl­ated N atom of the piperazine ring, and the dimensions and conformations of the fused tricyclic system are very similar. However, differences are apparent in the piperazine component: in both compounds (II) and (III), the unprotonated N atom of this ring has a pyramidal geometry, but in compound (I) this atom has a planar geometry. In compound (III), both N-substituents in this ring occupy equatorial sites, but in compound (II) the fused tricyclic system occupies an axial site of the piperazine ring. The independent components of compound (I) are linked within the selected asymmetric unit by a combination of N-HO and C-HO hydrogen bonds, and these hydrogen-bonded aggregates are linked into chains by an aromatic - stacking inter­action. In compound (II), the components are linked into sheets by a combination of O-HO, N-HO and C-HO hydrogen bonds, and in compound (III), a combination of N-HO, C-HO and C-HN hydrogen bonds links the components into a three-dimensional framework structure. Comparisons are made with some similar compounds.Publisher PDFPeer reviewe