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Kerli Süleyman Alver Ümit Eskalen Hasan Uruş Serhan Soğuksu Ali Kemal 《Russian Journal of Applied Chemistry》2019,92(2):304-309
Russian Journal of Applied Chemistry - Boron doped vanadium thin films were fabricated on the micro-slide glass substrates by spray pyrolysis technique at substrate temperature of 400°C.... 相似文献
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Sandip A. Kadam Kerli Martin Kristjan Haav Dr. Lauri Toom Dr. Charly Mayeux Astrid Pung Prof. Philip A. Gale Dr. Jennifer R. Hiscock Dr. Simon J. Brooks Dr. Isabelle L. Kirby Dr. Nathalie Busschaert Prof. Ivo Leito 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(13):5145-5160
The binding constants (log Kass) of small synthetic receptor molecules based on indolocarbazole, carbazole, indole, urea and some others, as well as their combinations were measured for small carboxylate anions of different basicity, hydrophilicity and steric demands, that is, trimethylacetate, acetate, benzoate and lactate, in 0.5 % H2O/[D6]DMSO by using the relative NMR‐based measurement method. As a result, four separate binding affinity scales (ladders) including thirty‐eight receptors were obtained with the scales anchored to indolocarbazole. The results indicate that the binding strength is largely, but not fully, determined by the strength of the primary hydrogen‐bonding interaction. The latter in turn is largely determined by the basicity of the anion. The higher is the basicity of the anion the stronger in general is the binding, leading to the approximate order of increasing binding strength, lactate<benzoate<acetate≤trimethylacetate, which holds with all investigated receptors. Nevertheless, there are a number of occasions when the binding order changes with changing of the carboxylate anion, sometimes quite substantially. Principal component analysis (PCA) reveals that this is primarily connected to preferential binding of trimethylacetate, supposedly caused by an additional hydrophobic/solvophobic interaction. These findings enable making better predictions, which receptor framework or cavity is best suited for carboxylate anions in receptor design. 相似文献
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Crystallography Reports - In this study, ZnO particles were grown at different ethanol–water concentrations by using a simple hydrothermal method at 97°C. The changes in structure and... 相似文献
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Kerli Orav-Puurand 《Numerical Functional Analysis & Optimization》2013,34(3-4):352-370
In a weakly singular integral equation of the second kind, we perform a smoothing change of variables and solve the resulting equation either by the collocation or by the product integration method based on a “central part” interpolation by polynomials on the uniform grid. Optimal convergence order of both methods is established. The latter method is hopeful due to especially simple and cheap assembling of the algebraic system of equations. 相似文献
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Kerli Orav-Puurand Gennadi Vainikko 《Journal of Computational and Applied Mathematics》2010,234(9):2848-2858
Nyström type methods are constructed and justified for a class of Fredholm integral equations of the second kind with kernels which may have weak diagonal and boundary singularities. The proposed approach is based on a suitable smoothing change of variables and product integration techniques. Global convergence estimates are derived and a collection of numerical results is given. 相似文献
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Kerli Martin Sandip A. Kadam Ulriika Mattinen Johan Bobacka Ivo Leito 《Electroanalysis》2019,31(6):1061-1066
The construction and study of solid‐contact acetate‐selective electrodes is described using a 1,3‐bis(carbazolyl)urea derivative as a neutral hydrogen‐bonding ionophore and poly(3,4‐ethylenedioxythiophene) as the solid contact. It was shown recently that this ionophore binds acetate (logKass=4.98) that is used as primary ion in this study. The electrodes show linearity over the activity range of 10?4.50–10?1.10 with a sub‐Nernstian slope of ?51.3 mV per decade and a detection limit of 10?5.00. The anion‐selectivity pattern of these electrodes deviates markedly from the Hofmeister pattern. When adding ionophore to the membrane the logarithm of the selectivity coefficient (logK) for SCN? decreased from 6.5 to 1.2, logK for I? decreased from 5.7 to 0.9, logK for NO3? decreased from 4.3 to 0.6 and logK for Br? decreased from 3.3 to 0.1. The selectivity coefficients of hydrophilic anions such as Cl?, F?, HPO42?, and SO42? are significantly lower than in case of the ionophore‐free membrane. It was discovered that the constructed electrodes are also relatively selective to bicarbonate. This work is an important step towards the further development of solid‐contact anion‐selective electrodes. 相似文献
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