Publications

²⁹<font>Si</font> NMR chemical shifts in silicates

Transformation of a 4-membered ring zinc phosphate SBU to a sodalite-related 3-dimensional structure through a linear chain structure

A zero-dimensional zinc phosphate, comprising a 4-membered ring, is shown to spontaneously transform at room temperature, to a linear chain structure consisting of corner-shared 4-membered rings, the latter transforming to a 3-dimensional sodalite-related structure under mild conditions.

White-light sources based on composites of GaN nanocrystals with conducting polymers and nanophosphors

Optical properties of nanocomposites of GaN nanocrystals, 2–4 nm in diameter, with conjugated polymers such as poly(2-methoxy,5-(2-ethylhexoxy)-1,4-phenylenevinylene (MEHPPV) as well as with phosphors nanoparticles have been investigated for use as white light sources. Photoluminescence spectra of the nanocomposites with different weight ratios of the two components are reported. Weak electroluminescence has been observed in the case of MEHPPV-GaN nanocomposites. The GaN–nanophosphor composites exhibit a high quality white light with good CIE coordinates along with an excellent colour rendering index.

CCDC 283066: Experimental Crystal Structure Determination

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.

Layered Tin(II) Oxalates Possessing Large Apertures

Two layered tin(II) oxalate structures have been prepared by hydrothermal methods in the presence of structure-directing organic amines. The crystal data for these structures are as follows: oxalate I, [(CH3)2NH(CH2)2NH(CH3)2]2+[Sn2(C2O4)3]2-·H2O, monoclinic, space group C2/c (no. 15), a = 16.567 (8) Å, b = 10.851 (6) Å, c = 11.652 (6) Å, β = 102.62 (3)°, V = 2039.0 (1) Å3, Z = 4, M = 637.4(1), Dcalc = 2.825 g cm-3, Mo Kα, RF = 0.04; oxalate II, [C(NH2)3]2+[Sn4(C2O4)5]2-·2H2O, orthorhombic, space group Pbca (no. 61), a = 11.390 (1) Å, b = 14.742 (1) Å, c = 16.755 (1) Å, V = 2813.1 (1) Å3, Z = 8, M = 1070.8(1), Dcalc = 2.844 g cm-3, Mo Kα, RF = 0.06. In I, pseudo-pentagonal-bipyramidal SnO6 units form a puckered layered structure by sharing oxygens with the oxalate anions. The layers contain 8- and 12-membered apertures, and the amine (protonated N,N,N'N'-tetramethyl-1,2-diaminoethane) and water molecules are in the interlamellar region where they interact with the framework and with each other by hydrogen bonding. The lone pairs of the Sn(II) atoms point into the interlamellar region. Oxalate II contains both square-pyramidal SnO4 units and SnO6 units similar to those in I. These units together form a saw-tooth lamellar structure by linking through the oxalates. The sheets contain 20-membered corrugated rings, which hold two amine cations (guanidinium) and two water molecules, which interact with the framework via hydrogen bonding.

Notizen: Vacancy Ordering in Anion-deficient LaNiO₃

LaNiO 3 loses oxygen in well-defined equilibrium stages. Electron diffraction studies show the presence of super-structure due to vacancy ordering in an anion-deficient sample.

A novel iron fullerene (FeC60) adduct in the solid state

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel iron fullerene (FeC60) adduct in the solid stateT. Pradeep, G. U. Kulkarni, K. R. Kannan, T. N. Guru Row, and C. N. R. RaoCite this: J. Am. Chem. Soc. 1992, 114, 6, 2272–2273Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published inissue 1 March 1992https://pubs.acs.org/doi/10.1021/ja00032a059https://doi.org/10.1021/ja00032a059research-articleACS PublicationsRequest reuse permissionsArticle Views340Altmetric-Citations64LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-AlertscloseSupporting Info (1)»Supporting Information Supporting Information Get e-Alerts

CCDC 759580: Experimental Crystal Structure Determination

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.

ChemInform Abstract: Physical Chemistry of High‐Temperature Oxide Superconductors

Review: (brief discussion of structure and properties of the families of oxide superconductors discovered since 1986 with special attention to the states of copper and oxygen in the cuprates; listing of experimental observations related to the superconducting and normal states that have to be explained by theoretical models; overview of the current theoretical models; indication of possible future directions; more than 85 refs.

New Open-Framework Zinc Oxalates Synthesized in the Presence of Structure-Directing Organic Amines

Two new open-framework zinc oxalates have been prepared by hydrothermal methods in the presence of structure-directing organic amines. The crystal data for these oxalates are as follows: I, [H3N(CH2)3NH3]2+[Zn2(C2O4)3]2-·3H2O, triclinic, space group P1̄ (no. 2), a = 9.261(1) Å, b = 9.455(1) Å, c = 12.487(1), α = 83.93(1)°, β = 88.01(1)°, γ = 61.03(1)°, V = 951.1(1) Å3, Z = 2, M = 524.8, Dcalc = 1.83 g cm-3, μ = 2.60 mm-1, Mo Kα, RF = 0.03; II, 2[C3H7NH3]+[Zn2(C2O4)3]2-·3H2O, monoclinic, space group C2/c (no. 15), a = 15.847(1) Å, b = 9.685(1) Å, c = 18.333(1), β = 115.5(1)°, V = 2539.1(2) Å3, Z = 4, M = 569.1, Dcalc = 1.60 g cm-3, μ = 1.97 mm-1, Mo Kα, RF = 0.07. In I, the linkages between the Zn and oxalate units gives rise to a layered architecture with 12-membered (6 Zn and 6 oxalates) honeycomb-like apertures wherein the amine and water molecules are located. In II, the Zn−oxalate layers are cross-linked by another oxalate unit giving rise to a three-dimensional structure with two distinct channels where the amine and water molecules reside; the largest aperture in II involves a 20-membered ring (10 Zn and 10 oxalates). There is extensive hydrogen bonding among the amine, water, and the framework. Adsorption studies indicate that water can be reversibly adsorbed in I.

Mössbauer Studies of the Thermal Effects on β-FeOOH, , (Cr _0.8 Fe _0.2) (OH)₃, and Corresponding Oxides

Mössbauer Studies of the Thermal Effects on β-FeOOH, , (Cr 0.8 Fe 0.2) (OH)3, and Corresponding Oxides was published in Volume 12, Number 2 August 16 on page 605.

Chemical Design of Materials: A Case Study of Inorganic Open-Framework Materials

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.

Crystal Chemistry and Magnetic Properties of Layered Metal Oxides Possessing the <font>K</font>₂<font>NiF</font>₄ or Related Structures

Dielectric anomaly in RF sputtered LiNbO 3 films

No abstract is provided for this article.

ADSORPTION OF METHANOL ON THE SURFACES OF COPPER ALLOYS. UPS AND EELS STUDIES

Methanol adsorbs molecularly on the surfaces of Cu–Pd alloys at low temperatures and transforms to CH3O or CO on warming, depending upon the alloy composition. On oxygen presorbed Cu–Pd alloy surfaces, adsorption of methanol gives rise to H2O and H2CO. CH3OH adsorbed molecularly on the surfaces of Cu–Au alloys and CH3O is formed only at relatively high temperatures.

ChemInform Abstract: RADIKALANIONEN VON PYRIDINDERIVATEN

No abstract is provided for this article.

Carbon-Nanohorn-Reinforced Polymer Matrix Composites: Synergetic Benefits in Mechanical Properties

Mechanical properties of single-walled carbon nanohorns (SWNH) and SWNH plus few-layer graphene (EG)-reinforced poly(vinyl alcohol) (PVA) matrix composites have been measured using the nanoindentation technique. The elastic modulus (E) and hardness (H) of PVA were found to improve by ∼315% and ∼135%, respectively, upon the addition of just 0.4 wt % SWNH. These properties were found to be comparable to those obtained upon the addition of 0.2 wt % single-walled nanotubes (SWNT) to PVA. Furthermore, upon binary addition of 0.2 wt % EG and 0.4 wt % SWNH to PVA, benefits in the form of ∼400% and ∼330% synergy in E and H, respectively, were observed, along with an increased resistance to viscoelastic deformation. The reasons for these improvements are discussed in terms of the dimensionality of nanocarbon, the effectiveness of nanocarbon and polymer matrix interaction, and the influence of nanocarbon on the degree of crystallinity of the polymer. The results from SWNH reinforcement in this study demonstrate the scope for a novel and, in contrast to SWNT composites, a commercially feasible opportunity for strengthening polymer matrices.

Valence states and magnetic properties of <font>LaNi</font>_1−x<font>Mn</font>_x<font>O</font>₃ (for 0 ≤ x ≤ 0.2 and x = 0.5)

No abstract is provided for this article.