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In the last four to five years, there has been a great resurgence of research on two-dimensional inorganic materials, partly because of the impetus received from graphene research. Unlike graphene, which is a gap-less material, most inorganic layered materials are semiconductors or insulators. Some of them, as exemplified by MoS 2 , exhibit unexpected properties, not unlike graphene, with possible applications. Thus, layered metal chalcogenides are being explored intensely, and MoS 2 is emerging as a wonder material. In this article, we present the synthesis and properties of nanosheets composing single or few layers of these fascinating materials. Besides metal chalcogenides, boron nitride, borocarbonitrides (B x C y N z ), metal oxides, and metal-organic frameworks are also discussed.
EELS studies provide definitive evidence for the hydroxylation of oxygen-covered Cu(110) and Zn(0001) surfaces on interaction with proton donor molecules such as H2O, CH3OH, HCOOH, NH3 and (CH3)2NH. The occurrence of surface hydroxylation is unambiguously shown by a study of the interaction of H2S and HCl with an oxygen covered Cu(110) surface.
A manganese oxalate of the composition, K2[Mn2(C2O4)3]2[KCl]·2H2O, containing metal oxalate layers connected by monodentate oxalate units has been synthesized hydrothermally. An unique feature of this material is that it contains KCl chains with a KCl distance of ∼3.2Å, close to the value in bulk KCl.
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 is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Multi-walled, single-walled and double-walled carbon nanotubes as well as graphene can be doped with boron and nitrogen. B2H6 has been generally used as the boron source while NH3 or pyridine is employed as the nitrogen source. Doping carbon nanotubes and graphene with boron and nitrogen brings about significant changes in the electronic structure and properties. Such doping not only results in desirable properties but also allows manipulation of properties for specific purposes. Doping with boron- and nitrogen-causes marked changes in the Raman spectra of the carbon nanostructures. In this article, we present the synthesis, characterization and properties of boron- and nitrogen-doped carbon nanotubes and graphene.
Photoluminescence spectra of nanophosphors including the yellow phosphor YAG:Ce as well as the green and red phosphors based on CdSe nanoparticles have been studied in the media of oxide gels and polymers of different refractive indices. The oxide gels employed are of silica, zirconia and their solid solutions with the refractive index, n, varying between 1.46 and 2. Different polymers afforded the variation of refractive index in the range 1.35–1.58. The wavelength corresponding to emission maxima of the phosphors are found to shift to lower wavelengths with increase in the refractive index of the medium. The shifts in the various media are found to be proportional to the refractive index term, n 2 −1/2n 2 +1. The sensitivity of the emission maxima of the nanophosphors to the medium refractive index may be useful for practical applications such as solid-state lighting.
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Availability of pure, well-characterized solid samples is crucial to all solid state studies. A knowledge of the various experimental methods available for the preparation of solids therefore becomes an important and integral part of solid state chemistry (Corbett, 1987; Hagenmuller, 1972; Honig & Rao, 1981; Rao, 1994). A brief reflection on the development of solid state science reveals that, in many cases, it is the synthesis of a novel compound that has triggered off a new line of research. Tables 3.1 and 3.2 provide a few examples to illustrate the point. To many solid state scientists, preparation of solids may mean preparation of single crystals of elements or simple compounds (e.g. Si, Ge, III-V semiconductors, alkali halides, etc.) for a study of a specific property or for technical applications. Preparation of solids is, however, a much more general activity, particularly amenable to chemists. A variety of strategies are adopted to prepare solids and to grow crystals. Technological advances have enabled solid state chemists to employ a broad range of conditions for preparative purposes. Ultra-rapid quenching of materials from very high temperatures, irradiation heating by intense laser beams, melting of solids by electron-beam heating or by the skull method and use of high pressures have become common procedures. Thus, by employing high-power CO2 lasers (> 1200 W) several entropy-stabilized metastable (e.g. α-CaCr2O4, BaNi2In8O15) and mixed-valent oxides (e.g. Sr7Nb2IVNb4VO21 and Ba2TiIII12TiIVO22) have been synthesized (Möhr & Müller-Büschbaum, 1995).
Normal vibration analysis of the in-plane vibrations of methyl N-methylthiocarbamate, CH3NH(CS)OCH3, has been carried out employing the Urey-Bradley-Shimanouchi force field; the band assignments and force constants have been compared with those of related molecules. Rotational isomerism about the C-N bond of alkylthiocarbamates has been examined by infrared and NMR spectroscopy. Perturbations of the infrared bands of CH3NH(CS)OCH3 in its complexes with iodine and metals have been briefly discussed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolar Effects in the Infrared and the Near Ultraviolet Absorption Spectra of Aliphatic KetonesC. N. R. Rao, G. K. Goldman, and C. LurieCite this: J. Phys. Chem. 1959, 63, 8, 1311–1312Publication Date (Print):August 1, 1959Publication History Published online1 May 2002Published inissue 1 August 1959https://pubs.acs.org/doi/10.1021/j150578a024https://doi.org/10.1021/j150578a024research-articleACS PublicationsRequest reuse permissionsArticle Views41Altmetric-Citations13LEARN 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 options Get e-Alerts
Carbon nanotubes were discovered soon after the successful laboratory synthesis of fullerenes. Since their discovery in 1991, there has been intensive research activity in the area of carbon nanotubes, not only because of their fascinating structural features and properties, but also because of their potential technological applications. There is increasing experimental evidence to show that carbon nanotubes may find use in nanoelectronic devices, displays, and in hydrogen storage. In this article, we discuss various important aspects related to the synthesis, structure, characterization, and mechanism of formation of multi-walled and single-walled carbon nanotubes, followed by a presentation of the important electronic, mechanical, hydrogen storage, and other properties of the nanotubes. Doping, as well as other chemical manipulations with boron and nitrogen, bring about significant changes in the properties of the nanotubes. Carbon nanotubes also serve as useful templates to make other nanostructures. Layered metal chalcogenides, boron nitride, and other materials form nanotubes and provide considerable scope for study.
