Bojidarka Koleva, Rositsa Nikolova, Atanas Tchapkanov, Tsonko Kolev, Heike Mayer-Figge, Michael Spiteller and William Sheldrick
Crystal structure and spectroscopic properties of 4-acetaminopyridine and its protonated form
4-Acetaminopyridine dihydrate and its protonated form, stabilized as the hydrochloride salt have been synthesized and spectroscopic elucidated in solution and in the solid-state by means of the inear-polarized solid state IR-spectroscopy (IR-LD), UV-spectroscopy, TGA, DSC, and the positive and negative ESI MS. Quantum chemical calculations were used to obtain the electronic structure, vibrational data and the electronic spectra. The spectroscopic and theoretical data are compared with the structure of the first compound obtained by single crystal X-ray diffraction. The effect of Npy protonation on the optical and magnetic properties of a 4-acetaminopyridine is discussed.
Tert-butyl esters of 2,3-diaryl-3-arylaminopropanoic acids - stereoselective synthesis, isolation, spectroscopic and structural elucidation
A series of seven substituted tert-butyl esters of 2,3-diaryl-3-arylaminopropanoic acids has been synthesized, isolated, spectroscopically and structurally elucidated. An influence of the substituents on the spectroscopic characteristics and conformations is discussed using the data of the linear-polarized IR- (IR-LD), UV-spectroscopy and 1H-NMR. Theoretical quantum chemical calculations are carried out, with a view to explaining and supporting the experimental optical properties and the electronic structure. The stereoselective synthesis of the corresponding diastereoisomers is optimized, thus giving good yields (62-72%) and purity of the compounds
W. Christopher Immanuel, S. Paul Mary Deborrah, S.S.R. Inbanathan and D. Nithyaa Sree
Polycrystalline chalcogenide semiconductors play a vital role in solar cell applications due to their outstanding electrical and optical properties. Among the chalcogenide semi-conductors, CdZnS is one kind of such important material for applications in various modern solid state devices such as solar cells, light emitting diode, detector etc. Due to their applications in numerous electro-optic devices, group II-VI semiconductors have been studied extensively. In recent years, major attention has been given to the study of electrical and optical properties of CdZnS thin films. In this work, Cd1−xZnxS thin films were prepared by chemical bath deposition technique. Phase purity and surface morphology properties were analyzed using field emission scanning electron microscope (FE-SEM) and X-ray diffraction (XRD) studies. Chemical composition was studied using energy dispersive spectrophotometry (EDS). Optical band gap property was investigated using UV-Spectroscopy. Electrical conductivity studies were performed by two probe method and thermoelectric power setup (TEP) to determine the type of the material. This work reports the effect of Zn on structural, electrical, microstructural and optical properties of these films.
Gunārs Bremanis, Maris Klaviņš, Oskars Purmalis, Raitis Ziemelis and Solveiga Maļecka
Albrecht, R., Petit, J. L., Terrom, G., Périssol, C. (2011). Comparison between UVspectroscopy and nirs to assess humification process during sewage sludge and green wastes co-composting. Biores. Technol. , 102 (6), 4495-4500.
Atiyeh, R. M., Lee, S., Edwards C. A., Arancon, N. Q., Metzger, J. D. (2002). The influence of humic acids derived from earthworm-processed organic wastes on plant growth. Biores. Technol ., 84 (1), 7-14.
Borah, M. C., Mahanta, P., Kakoty, S. K., Saha, U. K
) Classification of Argentinean Sauvignon blanc wines by UVspectroscopy and chemometric methods. J. Food Sci. 78: 432-436.
Dufour E, Letort A, Laguet A, Lebecque A, Serra JN (2006) Investigation of variety, typicality and vintage of French and German wines using front-face fluorescence spectroscopy. Anal. Chim. Acta 563: 292-299.
Markechová D, Májek P, Kleinová A, Sádecká J (2014) Determination of the adulterants in adulterant-brandy blends using fluorescence spectroscopy and multivariate methods. Anal. Methods 6: 379-386.
Martelo-Vidal MJ, Domínguez-Agis F
Juris Burlakovs, Rūta Ozola, Juris Kostjukovs, Ivars Kļaviņš, Oskars Purmalis and Māris Kļaviņš
-vis and fluorescence spectroscopy. 2005, Catalysis Today vol. 101, issue 3, pp. 267-274. http://dx.doi.org/10.1016/j.cattod.2005.03.011
36. Purmalis, O., Klavins, M. Comparative study of peat humic acids by using UVspectroscopy. In: 1st Annual International Interdisciplinary Conference, AIIC 2013, Conference Proceedings. 2013, European Scientific Journal, vol. 3, pp. 850-859.
37. Polak, J., Bartoszek, M., Żądło, M., Kos, A., Sułkowski, W.W. The spectroscopic studies of humic acid extracted from sediment collected at different seasons
Jānis Šīre, Māris Kļaviņš, Oskars Purmalis and Viesturs Melecis
Chen, Y., Senesi, N., Schnitzer, M. (1977) Information provided on humic substances by E 4 /E 6 ratios. Soil Sci. Soc. Amer. J. , 41(2), 352-358.
Corvasce, M., Zsolnay, A., D'Orazio, V., Lopez, R., Miano, T. M. (2006) Characterization of water-extractable organic matter in a deep soil profile. Chemosphere , 62, 1583-1590.
Domeizel, M., Khalil, A., Prudent, P. (2004) UVspectroscopy: a tool for monitoring humification and for proposing an index of the maturity of compost. Bioresource Technol. , 94, 177
V. Analysis of ACE inhibitors in pharmaceutical dosage forms by derivative UVspectroscopy and liquid chromatography (HPLC) J Pharm Biomed Anal 1997; 16: 431-438.
18. Odovic JV, Stojimirovic BB, Aleksic MB, Milojković-Opsenica DM, Tešic Ž.Lj. Examination of the hydrophobicity of ACE inhibitors and their active metabolites by salting-out thin-layer chromatography. J Planar Chromat 2005; 18: 98-103. 13
19. Odovic J, Stojimirovic B, Aleksic M, Milojkovic-Opsenica D, Tesic Z. Reversedphase thin-layer chromatography of some angiotensin converting enzyme
Soad S. Abd El-Hay, Hisham Hashem and Ayman A. Gouda
high performance liquid chromatography, Analyst 133 (2008) 1187–1194; DOI: 10.1039/b802679c.
23. B. Dhandapani and N. Thirumoorthy, Development and validation for the simultaneous quantification of nebivolol hydrochloride and hydrochlorothiazide by UVspectroscopy, RP-HPLC and HPTLC in tablets, E-J. Chem. 7 (2010) 341–348; DOI: 10.1155/2010/483495.
24. S. J. Joshi, P. A. Karbhari, S. I. Bhoir, K. S. Bindu and C. Das, RP-HPLC method for simultaneous estimation of bisoprolol fumarate and hydrochlorothiazide in tablet formulation, J. Pharm. Biomed