Investigation of the Local Structure of Vanadium Silicalite Catalyst (VS-1) Using XAFS, FT-IR and Photoluminescence Spectroscopic Methods

Abstract Background Environment-friendly fast and accurate mid-infrared spectroscopic methods have been developed for the quantitative analysis of doxorubicin hydrochloride (DOX) and arterolane maleate (ALM) in bulk and marketed formulations. Both transmittance and reflectance modes have been used for the analysis and a comparison has been drawn for better accuracy. The analytical methods were validated in accordance with International Council for Harmonisation (ICH) guidelines Results The proposed methods have been successfully developed and validated for the quantification of doxorubicin and arterolane maleate in solid bulk and dosage form. High recovery values in both the modes, while analysing DOX and ALM, indicated good accuracy of the methods. The methods showed excellent repeatability and intermediate precision [% RSD (Relative Standard Deviation < 2.0%]. The assay values of the drugs in solid dosage forms were also found close to the labelled claim. Conclusion The proposed Fourier transform infrared (FT-IR) spectroscopic methods were found to be specific, reproducible, valid and could be used as general methods for the quantification of most of the solid drug preparations such as tablets, capsules and powders.

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Spectroscopic Methods in the Evaluation of Modified Vegetable Base Oils from Crambe abyssinica

Molecules ◽

10.3390/molecules23123243 ◽

2018 ◽

Vol 23 (12) ◽

pp. 3243 ◽

Cited By ~ 3

Author(s):

Michał Szmatoła ◽

Justyna Chrobak ◽

Rafał Grabowski ◽

Jolanta Iłowska ◽

Julia Woch ◽

...

Keyword(s):

Nmr Spectroscopy ◽

Vegetable Oil ◽

Supercritical Co2 ◽

Spectroscopic Methods ◽

Spectroscopic Techniques ◽

Chemical Transformations ◽

Chemical Changes ◽

Crambe Abyssinica ◽

Oxidation Processes ◽

Ft Ir

Raw vegetable oil from Crambe abyssinica was subjected to oxidative treatment to enhance its viscosity. The oxidation processes were carried out in the presence of N-hydroxyphthalimide with or without supercritical CO2 as a solvent. Four spectroscopic techniques (Raman, UV-VIS, FT-IR, NMR) were applied to assess the chemical changes taking place during the oxidation. Raman and NMR spectroscopy proved best in the assessment of the chemical transformations leading to increased viscosity of the modified vegetable oil.

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Side Chain Influence on Main Chain Orientation of PPV-Type Oligomers

MRS Proceedings ◽

10.1557/proc-598-bb3.16 ◽

1999 ◽

Vol 598 ◽

Author(s):

Ruth Müllner ◽

Laurence Noirez ◽

Egbert Zojer ◽

Franz Stelzer ◽

Günther Leising

Keyword(s):

Magnetic Field ◽

Neutron Diffraction ◽

Main Chain ◽

Side Chain ◽

Phenylene Vinylene ◽

Spectroscopic Methods ◽

Polarized Optical Microscopy ◽

Chain Orientation ◽

H Nmr ◽

Ft Ir

ABSTRACTOligo (p-phenylene vinylene)s OPV were synthesized having cyanobiphenyloxy-groups bonded to the vinylene double bonds via alkylene spacers. A Pd(0)-reaction was used to synthesize the oligomers starting with the dibromo-substituted benzene and the alkenyloxy-biphenyl-nitrile. The orientation of the mesogens by a magnetic field and their influence on the orientation of the main chain was investigated by means of neutron diffraction ND. Data on the photophysics of the oligomers were gained using several spectroscopic methods such as UV/VIS, polarized optical microscopy POM, SEC, 1H-NMR, FT-IR.

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Hybrid Nanocomposites Based on Metal Oxides and Polysiloxanes with Controlled Morphology

MRS Proceedings ◽

10.1557/proc-1007-s12-55 ◽

2007 ◽

Vol 1007 ◽

Author(s):

Sorin Ivanovici ◽

Christoph Rill ◽

Claudia Feldgitscher ◽

Guido Kickelbick

Keyword(s):

Metal Oxides ◽

Sol Gel ◽

Hybrid Nanocomposites ◽

Hybrid Nanoparticles ◽

Spectroscopic Methods ◽

Metal Alkoxides ◽

Transmission Electron ◽

Sol Gel Process ◽

Ft Ir ◽

Controlled Morphology

ABSTRACTHybrid materials based on polysiloxanes and metal oxides (SiO2, TiO2, ZrO2) were prepared by hydrosilation of allyl acetoacetate (AAA) modified metal alkoxides (M(OR)4; M = Ti, Zr; R = ethyl, isopropyl) or vinyl triethoxysilane with poly(dimethylsiloxane-co-hydrosiloxane) (PDMS-co-PMHS). The obtained compounds acted as single-source precursors in the sol-gel process. Various spectroscopic methods showed the complete functionalization of the polysiloxane chains with the complexes. When alcohols were used as solvents in the sol-gel process, hybrid nanoparticles were obtained, as observed by dynamic light scattering (DLS) measurements, transmission electron microscopy (TEM), and spectroscopic methods such as NMR and FT-IR.

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STRUCTURAL INVESTIGATIONS OF CuO–B2O3–Bi2O3 GLASSES BY MEANS OF EPR AND FT-IR SPECTROSCOPIES

Modern Physics Letters B ◽

10.1142/s0217984904007414 ◽

2004 ◽

Vol 18 (16) ◽

pp. 803-810 ◽

Cited By ~ 1

Author(s):

I. ARDELEAN ◽

SIMONA CORA ◽

RALUCA CICEO-LUCACEL

Keyword(s):

Local Structure ◽

Copper Content ◽

Copper Ions ◽

Glass Structure ◽

Mixed Valence ◽

Structural Investigations ◽

Valence States ◽

Distorted Octahedral ◽

Ft Ir ◽

Ft Ir Spectroscopy

EPR and FT-IR spectroscopy have been used to investigate the B 2 O 3– Bi 2 O 3 glass matrix containing CuO in order to obtain more information about the local structure of these glasses. The EPR absorption spectra revealed the presence in the glass structure of the Cu 2+ ions in axially distorted octahedral environments. No superexchange interaction of Cu 2+ was detected. In the samples with x≥5 mol%, mixed valence states of copper ions were revealed. The FT-IR measurements indicate the presence in the glass structure of the distorted [ BiO 6] polyhedra, tri- and tetra-borate units ( BO 3, BO 4) and its dependence by the copper content.

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Local structure of hydroxy–peroxy apatite: A combined XRD, FT-IR, Raman, SEM, and solid-state NMR study

Journal of Physics and Chemistry of Solids ◽

10.1016/j.jpcs.2007.05.020 ◽

2007 ◽

Vol 68 (10) ◽

pp. 1863-1871 ◽

Cited By ~ 26

Author(s):

Huaguang Yu ◽

Hailu Zhang ◽

Xiaomin Wang ◽

Zhongwei Gu ◽

Xudong Li ◽

...

Keyword(s):

Solid State ◽

Local Structure ◽

Solid State Nmr ◽

Nmr Study ◽

Ft Ir

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Adsorption of Chromium(VI) Ions on to TiO2 from Aqueous Solution

Adsorption Science & Technology ◽

10.1177/026361749801600205 ◽

1998 ◽

Vol 16 (2) ◽

pp. 117-126 ◽

Cited By ~ 9

Author(s):

Fu Hongxiang ◽

Lu Gongxuan ◽

Li Shuben

Keyword(s):

Heavy Metal Ions ◽

Ion Concentration ◽

Spectroscopic Methods ◽

Ion Adsorption ◽

Adsorption Efficiency ◽

Organic Species ◽

Chromium Vi ◽

Ft Ir ◽

Ir Spectroscopic

The study of the adsorption of the CrVI ion on to TiO2 not only provides information on the removal of heavy metal ions from polluted aqueous solutions; but is also useful for further investigation of the photocatalytic decontamination of the CrVI ion or of CrVI–organic species which co-exist as pollutants with TiO2 when the latter is used as a stable and highly efficient photocatalyst. It has been found that dark adsorption of the CrVI ion on to TiO2 is mainly dependent on the acidity of the system and the initial concentration of the CrVI ion. As the pH of the system increases, so the extent of adsorption of the CrVI ion decreases. The greatest adsorption was obtained with an initial CrVI ion concentration of ca. 300 μmol/l. The presence of phosphate or acetate ions in the system dramatically decreases the adsorption efficiency of the CrVI ion. In contrast, the addition of formic acid leads to a limited increase in the extent of CrVI ion adsorption. Other organic ions and organic compounds examined showed no interference in CrVI ion adsorption. FT-IR spectroscopic methods were used for the characterization of CrVI ion adsorption on to TiO2.

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