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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.

The reaction of Cu(ClO4)2·6H2O and 1,2-bis(4-pyridyl)ethane (bpe) in basic aqueous solution yields a 3D compound, {[Cu3(CO3)2(bpe)3]·2ClO4}n (1) through the atmospheric fixation of CO2 composing Cu(CO3) kagomé layers pillared by the bpe linker that exhibit weak antiferromagnetic interaction in the kagomé layer and interlayer ferromagnetic coupling at low temperature.

Magnetic and electrical properties of four series of rare earth cobaltates of the formula La0.7−xLnxCa0.3CoO3 with Ln = Pr, Nd, Gd and Dy have been investigated. Compositions close to x = 0.0 contain large ferromagnetic clusters or domains, and show Brillouin-like behaviour of the field-cooled DC magnetization data with fairly high ferromagnetic Tc values, besides low electrical resistivities with near-zero temperature coefficients. When x>0.0, the zero-field-cooled data generally show a non-monotonic behaviour with a peak at a temperature slightly lower than Tc. The compositions near x = 0.0 show a prominent peak corresponding to the Tc in the AC susceptibility data. The ferromagnetic Tc varies linearly with x or the average radius of the A-site cations, . With increase in x or decrease in , the magnetization value at any given temperature decreases markedly and the AC susceptibility measurements show a prominent transition arising from small magnetic clusters with some characteristics of a spin glass. Electrical resistivity increases with increase in x, showing a significant increase around a critical value of x or , at which composition the small clusters also begin to dominate. These properties can be understood in terms of a phase separation scenario wherein large magnetic clusters give way to smaller ones with increase in x, with clusters of both types being present in certain compositions. The changes in magnetic and electrical properties occur in parallel since the large ferromagnetic clusters are hole rich and the small clusters are hole poor. Variable range hopping seems to occur at low temperatures in these cobaltates.

We report the interfacial properties of monolayers of Ag nanoparticles 10-50 nm in diameter formed at the toluene-water interface under steady as well as oscillatory shear. Strain amplitude sweep measurements carried out on the film reveal a shear thickening peak in the loss moduli (G") at large amplitudes followed by a power law decay of the storage (G') and loss moduli with exponents in the ratio 2:1. In the frequency sweep measurements at low frequencies, the storage modulus remains nearly independent of the angular frequency, whereas G" reveals a power law dependence with a negative slope, a behavior reminiscent of soft glassy systems. Under steady shear, a finite yield stress is observed in the limit of shear rate .gamma going to zero. However, for .gamma > 1 s-1, the shear stress increases gradually. In addition, a significant deviation from the Cox-Merz rule confirms that the monolayer of Ag nanoparticles at the toluene-water interface forms a soft two-dimensional colloidal glass.

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The Raman spectra of the high‐temperature (α) phase of crystalline malonic acid, CH 2 (COOH) 2 , and its deuteriated derivative, CD 2 (COOD) 2 , have been investigated at 370 K in the wavenumber shift range 0–4000 cm −1 . An assignment of the internal and external vibrations is given. Comparison of the infrared and Raman spectra of the α and β phases shows that the high‐temperature phase (α) consists of quivalent centrosymmetric dimer rings and that the corresponding space group is C  C2/c with molecules occupyging C 2 sites. The temperature dependence of various Raman lines, in particular those due to lattice modes, indicates that the phase transition is of first order and that during the transition, reorientation of the molecules about the c axis is strongly coupled with the low‐frequency torsional (γOH…O) and librational modes.

ADVERTISEMENT RETURN TO ISSUEArticleNEXTC. N. R. Rao FestschriftC. Angell, B. Bagchi, A. Buckingham, Sir John Thomas, and C. N. R. RaoCite this: J. Phys. Chem. 1994, 98, 37, 9083–9096Publication Date (Print):September 1, 1994Publication History Published online10 September 2003Published inissue 1 September 1994https://pubs.acs.org/doi/10.1021/j100088a600https://doi.org/10.1021/j100088a600research-articleACS PublicationsRequest reuse permissionsArticle Views355Altmetric-Citations-LEARN 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

No abstract is provided for this article.