Validation of reducing-difference procedure for the interpretation of non-polarized infrared spectra of n-component solid mixtures

Solid-state linear polarized IR-spectroscopy of croconic and rhodizonic acids

“…Oriented solid samples were obtained as a suspension in a nematic liquid crystal of the 4'-cyano-4'-alkylbicyclohexyl type (ZLI 1695, Merck). This new orientation solid-state method [15] used in linear-dichroic infrared (IR-LD) spectroscopy for accuracy, precision and the influence of the liquid crystal medium on peak positions and integral absorbances of the guest molecule bands as well as the optimization of experimental conditions and an experimental design for quantitative evaluation of the impact of four input factors have been presented [16][17][18]. The nature and balance of the forces in the nematic liquid crystal suspension system, the mathematical model for their clearance, morphology of the suspended particles and the influence of the space system types on the degree of orientation i.e.…”

“…3) for determination of the peak positions and corresponding integral absorbencies. In both compounds a significant degree of macroorientation of suspended particles [16][17][18] is obtained, leading to an adequate interpretation of corresponding polarized IR-spectra.…”

Novel organic material with potential NLO application - electronic and spectroscopic properties

“…A 4-cyano-4'-alkylbicyclohexyl mixture (ZLI-1695, Merck) was used as orientation host, applying the technique, colloid suspension in nematic liquid crystal [20][21][22][23]. The elemental analysis was performed according to the classical methods: C and H as CO 2 and H 2 O, N -through the Duma's method, chlorine -by titration with Hg(NO 3 ) 2 after a wet digestion of the sample.…”

Solid-state IR-LD spectroscopy of codeine and N-norcodeine derivatives

“…The means of two treatments (even if based on different numbers of replicates) were compared using the Student t-test. The optimization procedure is published [27,28]. The experimental IR spectral curves have been acquired and processed by means of the GRAMS /AI 7.01 IR spectroscopy (Thermo Galactic, USA) and STATISTICA for Windows 5.0 (StatSoft, Inc., Tulsa, OK, USA) program packages.…”