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Journal articles on the topic 'IR and UV-visible spectroscopy'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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1

A.J.B. "Computer methods in UV, visible and IR spectroscopy." Journal of Molecular Structure 248, no. 1-2 (August 1991): 211–12. http://dx.doi.org/10.1016/0022-2860(91)85016-v.

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2

Zettler, J. Th, Th Trepk, L. Spanos, Y. Z. Hu, and W. Richter. "High precision UV-visible-near-IR Stokes vector spectroscopy." Thin Solid Films 234, no. 1-2 (October 1993): 402–7. http://dx.doi.org/10.1016/0040-6090(93)90295-z.

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3

Alam, M. M., S. M. S. Islam, S. M. M. Rahman, and M. M. Rahman. "Simultaneous Preparation of Facial and Meridional Isomer of Cobalt-Amino Acid Complexes and their Characterization." Journal of Scientific Research 2, no. 1 (December 29, 2009): 91–98. http://dx.doi.org/10.3329/jsr.v2i1.2032.

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Preparation and characterization of various complexes of cobalt (III)-amino acid system, especially cobalt (III) glycinato and cobalt (III) alaninato complexes are reported. The identification of the various isomers of these complexes is also reported. The various isomers are separated from their mixture by fractional crystallization. Each of these complexes has been characterized by observing physical characteristics, chemical analysis, UV-visible spectroscopy and IR-spectroscopy. The direct impact of geometry of the complexes to IR stretching frequencies and UV-visible spectral data of amino and carboxyl group in the complexes provided sufficient information about the geometry. A prediction about the geometries of the synthesized has also been focused. Keywords: Cobalt; Amino acid; Isomers; UV-visible; IR. © 2010 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. DOI: 10.3329/jsr.v2i1.2032 J. Sci. Res. 2 (1), 91-98 (2010)
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4

Kaczmarek, Katarzyna, Andrzej Leniart, Barbara Lapinska, Slawomira Skrzypek, and Monika Lukomska-Szymanska. "Selected Spectroscopic Techniques for Surface Analysis of Dental Materials: A Narrative Review." Materials 14, no. 10 (May 17, 2021): 2624. http://dx.doi.org/10.3390/ma14102624.

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The presented work focuses on the application of spectroscopic methods, such as Infrared Spectroscopy (IR), Fourier Transform Infrared Spectroscopy (FT-IR), Raman spectroscopy, Ultraviolet and Visible Spectroscopy (UV-Vis), X-ray spectroscopy, and Mass Spectrometry (MS), which are widely employed in the investigation of the surface properties of dental materials. Examples of the research of materials used as tooth fillings, surface preparation in dental prosthetics, cavity preparation methods and fractographic studies of dental implants are also presented. The cited studies show that the above techniques can be valuable tools as they are expanding the research capabilities of materials used in dentistry.
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5

Rajeswari, R., and K. Jeyaprakash. "Bioactive potential analysis of brown seaweed Sargassum wightii using UV-VIS and FT-IR." Journal of Drug Delivery and Therapeutics 9, no. 1 (January 15, 2019): 150–53. http://dx.doi.org/10.22270/jddt.v9i1.2199.

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The current study was investigated to explore the biogenic molecules of Sargassum wightii collected from the south east of Tamil Nadu, India. The biogenic molecules extracted from Sargassum wightii by using methanol as a solvent and the analysis was carried out by using UV-Visible spectroscopy and FT-IR. The UV-Visible spectrum of the methanolic extract of Sargassum wightii exposed the existence of the biogenic molecules separated from 200 - 1100 nm among the absorption. The incidence of peaks from 234-676 nm discovered the presence of flavonoids and its derivatives. The unprocessed methanolic extract of Sargassum wightii was travelled in to FT-IR and it indicated the being of phenols and flavonoids their functional groups such as alcohol, alkane, carboxylic acids, esters, ethers, alkynes and aromatics. From the results, the future aim of this study is necessary to develop the target site to treat dreadful diseases. Keywords: Sargassum Wightii, FT-IR, UV-Visible Spectroscopy, Phytochemical analysis.
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6

Huang, Sung-Chou, and Ching-Yao Lin. "Reductive electropolymerization of N-methyl-3-pyridylethynyl-porphyrins." Chemical Communications 51, no. 3 (2015): 519–21. http://dx.doi.org/10.1039/c4cc08157a.

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7

GHAMMAMY, SHAHRIAR, and SAJJAD SEDAGHAT. "Preparation and Characterization of the Schiff Base Ligand (E)- N-(3-nitrobenzylidene) isonicotinohydrazide and its Silver (I) Complex [Ag(NNBIH)2]+." Material Science Research India 9, no. 2 (December 25, 2012): 191–95. http://dx.doi.org/10.13005/msri/090203.

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We describe the synthesis and characterization of a new silver (I) complex of the Schiff base ligand (E) - N-(3-nitrobenzylidene) is onicotinohydrazide that abbreviated as NNBIH was synthesized and characterized. Ag (I) Metal complex of this Schiff base ligand prepared by reaction of nitrate salt of Ag (I) with NNBIH. Characterization of the ligand was made by microanalyses, FT-IR, UV–Visible spectroscopy and its complex was made by microanalyses, FT-IR and UV–Visible spectroscopy. TG- DTA and other analytical methods have been applied to the investigation of the thermal behavior and Structure of the compound [Ag(NNBIH)2]+. Thermal decomposition of these compounds is multistage processes.
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8

Khan, Raihana Imran, and Kasi Pitchumani. "A pyridinium modified β-cyclodextrin: an ionic supramolecular ligand for palladium acetate in C–C coupling reactions in water." Green Chemistry 18, no. 20 (2016): 5518–28. http://dx.doi.org/10.1039/c6gc01326k.

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An ionic Pd(ii) complex stabilized by a water soluble pyridinium modified β-cyclodextrin was prepared and characterized by NMR, mass spectrometry, FT-IR spectroscopy, UV-visible spectroscopy and DLS (dynamic light scattering).
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9

Jadhav, Ankita S., Ashvini U. Chaudhari, Kisan M. Kodam, and Dipalee D. Malkhede. "Photophysical and NMR studies of encapsulation of 2-cyano-6-hydroxy benzothiazole in p-sulfonatocalix[6]arene and its biological applications." Analyst 146, no. 17 (2021): 5294–306. http://dx.doi.org/10.1039/d1an00770j.

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Study of inclusion complexation of 2-cyano-6-hydroxy benzothiazole and p-sulfonatocalix[6]arene by UV-visible absorption spectroscopy, steady-state fluorescence spectroscopy, HR-MS, FT-IR, NMR, 2D NMR, and FESEM analysis and its biological activity.
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10

Gautam, Chandkiram. "Synthesis, Structural and Optical Investigations of (Pb, Bi)TiO3 Borosilicate Glasses." Physics Research International 2014 (July 13, 2014): 1–7. http://dx.doi.org/10.1155/2014/606709.

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A new series of lead bismuth titanate borosilicate glasses with addition of one percent lanthanum oxide have been synthesized using melt-quench technique. X-ray diffraction patterns have been recorded to confirm the amorphous nature of the prepared glass samples. The synthesized glasses have been characterized by using various spectroscopic techniques such as UV-visible, infrared, and Raman spectroscopy. UV-visible measurements were recorded in the wavelength range from 200 to 1100 nm whereas IR and Raman spectroscopic measurements were recorded over a continuous wavenumber range from 400 to 5000 cm−1 and 1000 to 2000 cm−1 respectively. The different absorption peaks/bands were formed in IR spectral patterns. The spectral bands appear towards the lower wavenumber sides due to the Bi and Pb, content while the bands appear towards the higher wavenumber sides due to the formation of diborate and triborate network units.
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11

Wang, Wen, Minglu Zhou, Luying Liang, Meijuan Lin, and Qidan Ling. "Synthesis and phosphorescent properties of the copolymers of N-vinylcarbazole, methyl methacrylate and iridium complex." Materials Science-Poland 32, no. 2 (June 1, 2014): 206–13. http://dx.doi.org/10.2478/s13536-013-0170-0.

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AbstractThe copolymers containing carbazole unit and iridium complexes, such as (Ir(bpy)2Cl, Ir(mbpy)2Cl and Ir(Brbpy)2Cl, were synthesized via radical copolymerization of N-vinylcarbazole, methyl methacrylate and iridium complex. The synthesized copolymers were characterized by FT-IR, UV-Vis absorption spectroscopy and photoluminescence (PL) spectroscopy, respectively. According to the results, the copolymers (Ir(Brbpy)2Cl/PVK and Ir(mbpy)2Cl/PVK) exhibit yellow phosphorescence with an emission peak at around 553 nm under UV-visible light in the solid state. The results also reveal almost complete energy transfer from the host carbazole segments to the guest Ir complex in the copolymer film when the Ir content reaches 1.0 wt.%. The synthesized copolymers are good candidates as blue or yellow phosphorescent materials for PLED applications.
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12

Ye, Tian-Qing, Caroline J. Arnold, David I. Pattison, Clare L. Anderton, Davor Dukic, Robin N. Perutz, Ronald E. Hester, and John N. Moore. "Development of an Ultrafast Laser Apparatus for Time-Resolved UV-Visible and Infrared Spectroscopy." Applied Spectroscopy 50, no. 5 (May 1996): 597–607. http://dx.doi.org/10.1366/0003702963905998.

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An ultrafast laser apparatus has been developed that allows time-resolved UV-visible and infrared spectroscopy to be performed with a time resolution of 200 fs. The instrument design allows UV-vis and IR data to be collected either as spectra or as kinetic profiles. Solution flow and cell translation sampling systems have been developed that allow the handling of chemical and biochemical systems, including highly air-sensitive materials and volumes as small as 50 μL. The apparatus performance has been evaluated with the use of trans-stilbene in hexane (UV-vis) and silicon (IR) test samples, and the techniques have been applied in combination to study both native carbonmonoxymyoglobin and the novel H64L mutant.
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13

Karim, Mohammad Rezaul. "Synthesis and Characterizations of Poly(3-hexylthiophene) and Modified Carbon Nanotube Composites." Journal of Nanomaterials 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/174353.

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Poly(3-hexylthiophene) and modified (functionalized and silanized) multiwall carbon nanotube (MWNT) nanocomposites have been prepared through in situ polymerization process in chloroform medium with FeCl3oxidant at room temperature. The composites are characterized through Fourier transfer infrared spectroscopy (FT-IR), Raman, and X-ray diffraction (XRD) measurements to probe the nature of interaction between the moieties. Optical properties of the composites are measured from ultraviolet-visible (UV-Vis) and photoluminescence (PL) spectroscopy. Conductivity of the composites is followed by four probe techniques to understand the conduction mechanism. The change (if any) in C=C symmetric and antisymmetric stretching frequencies in FT-IR, the shift in G band frequencies in Raman, any alterations inλmaxof UV-Vis, and PL spectroscopic measurements are monitored with modified MWNT loading in the polymer matrix.
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14

Aryamanya-Mugisha, Henry, and Ronald R. Williams. "A Fourier Transform Diode Array Spectrometer for the UV, Visible, and Near-IR." Applied Spectroscopy 39, no. 4 (July 1985): 693–97. http://dx.doi.org/10.1366/0003702854250301.

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15

Patel, Sachin, Manish Patel, and Ranjan Patel. "Synthesis and characterization of heterocyclic substituted fluoran compounds." Journal of the Serbian Chemical Society 72, no. 11 (2007): 1039–44. http://dx.doi.org/10.2298/jsc0711039p.

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New quinazolinone-substituted fluoran compounds were synthesized by reaction of keto acid, 2?-carboxy-2-hydroxy-4-N-pyrrolidinylbenzophenone with different quinazolinone derivatives in the presence of conc. sulphuric acid. All the synthesized fluoran compounds were characterized by spectroscopic methods (IR, 1H-NMR and UV-visible spectroscopy) and elemental analysis. The fluoran compounds are colorless or nearly colorless and develop color on contact with electron-accepting compounds.
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16

Mai Hung Thanh, Tung, Dong Thanh Dong, Quoc Nguyen Tri, The Do Minh, Phuong Tran Thi Thu, Hien Tran Thi Thu, Chi Nguyen Thi Phuong Le, Dieu Phan Thi, and Cam Nguyen Thi Dieu. "Synthesis of g-C3N4/InVO4 materials as novel photocatalysts for degradation of antibiotics under visible light." Vietnam Journal of Catalysis and Adsorption 10, no. 2 (July 30, 2021): 49–53. http://dx.doi.org/10.51316/jca.2021.027.

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Novel g-C3N4/InVO4 materials were synthesized by a fabricated via hydrothermal and heating methods. The physicochemical properties of the photocatalysts were investigated by X-ray diffraction (XRD), infrared spectroscopy (IR), Photoluminescence spectroscopy (PL), UV-Vis diffuse reflectance spectroscopy (UV-Vis-DRS) and Energy dispersive X-ray spectroscopy (EDX). The photocatalytic performances were evaluated by degradation of tetracycline (TC). The g-C3N4/InVO4 composite at a weight ratio of 10 % exhibited the most excellent photocatalytic activity for TC degradation under visible irradiation which was more active than that of pure components.
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17

Wang, Qi Guan, Wei Zhou, Su Min Wang, Wen Zhi Zhang, Jian Ping Li, Xiao Min Wang, and Zhi Yuan Lu. "Synthesis and Capacitance of Multi-Walled Carbon Nanotube/Polyaniline Nanocomposites." Advanced Materials Research 834-836 (October 2013): 108–11. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.108.

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We report on the synthesis and electrochemical properties of multi-walled carbon nanotube (MWNT)/polyaniline (PANI) nanocomposites. The MWNT/PANI composite was prepared through electrochemical polymerization and is confirmed by ultraviolet-visible spectroscopy (UV-vis) spectroscopy and Fourier transform infrared (FT-IR) spectroscopy. The MWNT/PANI nanocomposites show a specific capacitance value as high as 463 F/g.
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18

İnan, Ayşe, Mesut İkiz, Seçil Erden Tayhan, Sema Bilgin, Nusret Genç, Koray Sayın, Gökhan Ceyhan, Muhammet Köse, Ayşe Dağ, and Esin İspir. "Antiproliferative, antioxidant, computational and electrochemical studies of new azo-containing Schiff base ruthenium(ii) complexes." New Journal of Chemistry 42, no. 4 (2018): 2952–63. http://dx.doi.org/10.1039/c7nj04420h.

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19

DALACHE, CHERIFA, HADJ BENHEBAL, BEDHIAF BENRABAH, AEK AMMARI, ABDELMALEK KHARROUBI, and ABDELHAK LAKHAL. "CADMIUM-DOPED Co3O4 THIN FILMS: SYNTHESIS AND CHARACTERIZATION." Surface Review and Letters 26, no. 01 (January 2019): 1850134. http://dx.doi.org/10.1142/s0218625x18501342.

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This paper contains the results of the structural and spectroscopic characterizations of undoped and Cadmium-doped cobalt oxide thin films with different Co/Cd molar ratios (3%, 5%, 7% and 9%). The nanosized undoped and cadmium-doped Co3O4 thin layers were prepared using sol–gel process and deposited on glass substrates by dip coating. The changes caused by the incorporation of cadmium at different levels of doping have been highlighted by the techniques UV–Visible (UV–Vis) spectroscopy, Infrared (IR) spectroscopy, X-ray diffraction (XRD) measurements, SEM coupled EDX and impedance spectroscopy. From the UV–Vis spectroscopy analysis, it was found that all the films are two direct bandgap energies. The optical transmittance and the bandgap energy decrease with increase in Cd concentration. The XRD spectra confirm the films were polycrystalline with a cubic spinel structure. The results of the impedance spectroscopy show that the equivalent circuit of the synthesized samples is an RC parallel circuit.
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20

Anandh, B., A. Muthuvel, and M. Emayavaramban. "Bio Synthesis and Characterization of Silver Nanoparticles Using Lagenaria siceraria Leaf Extract and their Antibacterial Activity." International Letters of Chemistry, Physics and Astronomy 38 (September 2014): 35–45. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.38.35.

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The present investigation demonstrates the formation of silver nanoparticles by the reduction of the aqueous silver metal ions during exposure to the Lagenaria siceraria leaf extract. The synthesized AgNPs have characterized by UV-visible spectroscopy, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) techniques. AgNPs formation has screened by UV-visible spectroscopy through colour conversion due to surface plasma resonance band at 427 nm. X-ray diffraction (XRD) confirmed that the resulting AgNPs are highly crystalline and the structure is face centered cubic (fcc). FT-IR spectrum indicates the presence of different functional groups present in the biomolecules capping the nanoparticles. Further, inhibitory activity of AgNPs and leaf extract were tested against human pathogens like gram-pastive (Staphylococcus aureus, Bacillus subtilis), gram-negative (Escherichia coli and Pseudomonas aeruginosa). The results indicated that the AgNPs showed moderate inhibitory actions against human pathogens than Lagenaria siceraria leaf extract, demonstrating its antimicrobial value against pathogenic diseases
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21

Gabrieli, F., K. A. Dooley, M. Facini, and J. K. Delaney. "Near-UV to mid-IR reflectance imaging spectroscopy of paintings on the macroscale." Science Advances 5, no. 8 (August 2019): eaaw7794. http://dx.doi.org/10.1126/sciadv.aaw7794.

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Broad spectral range reflectance imaging spectroscopy (BR-RIS) from the near UV through the mid–infrared (IR) (350 to 25,000 nm or 28,571 to 400 cm−1) was investigated as an imaging modality to provide maps of organic and inorganic artists’ materials in paintings. While visible–to–near-IR (NIR) reflectance and elemental x-ray fluorescence (XRF) imaging spectroscopies have been used for in situ mapping, each method alone is insufficient for robust identification. Combining the two improves results but requires complex data processing. To test BR-RIS, image cubes from early Italian Renaissance illuminated manuscripts were acquired using two spectrometers. Maps of pigments, including trace minerals associated with mined azurite, and their associated binding media were made. BR-RIS has a more straightforward analysis approach as implemented here than visible-to-NIR, mid-IR, or XRF imaging spectroscopy alone and offers the largest amount of macroscale information for mapping artists’ materials by comparison.
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22

Shahabadi, Nahid, and Maryam Mahdavi. "DNA Interaction Studies of a Cobalt(II) Mixed-Ligand Complex Containing Two Intercalating Ligands: 4,7-Dimethyl-1, 10-Phenanthroline and Dipyrido[3,2-a:2′,3′-c]phenazine." ISRN Inorganic Chemistry 2013 (December 30, 2013): 1–7. http://dx.doi.org/10.1155/2013/604218.

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A new cobalt(II) complex [Co(dppz)2(4,7-dmp)]2+ (4,7-dmp = 4,7-dimethyl-1,10-phenanthrolline) and dppz = dipyrido[3,2-a:2′-3′-c]phenazine has been synthesized and characterized by elemental analysis (CHN), FT-IR, and UV-visible (UV-Vis) spectroscopic techniques. The DNA-binding property of the complex has been investigated employing absorption spectroscopy, fluorescence spectroscopy, circular dichroism, and viscosity measurements. The experimental results show that the complex can bind to DNA in an intercalation mode. In comparison with previous study, the DNA-binding affinity of [Co(dppz)2(4,7-dmp)]2+ (Kb=1.1·106 M−1) is smaller than that of complex [Co(dppz)2(2,9-dmp)]2+ (Kb=2.5·106 M−1).
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23

Zhou, Zhi Wei, Ling Fang Qiu, Xiao Bin Qiu, and Shu Wang Duo. "The Synthesis, Characterization and Visible-Light Photodegradation Performance of Graphitic Carbon Nitride Coupling with CoAPO-5." Solid State Phenomena 281 (August 2018): 878–84. http://dx.doi.org/10.4028/www.scientific.net/ssp.281.878.

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In order to enhance hole/electron separation and charge transfer in photocatalysts, the heterostructured g-C3N4/CoAPO-5 hybrids materials were synthesized via a simple grinding method and were investigated using X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The optical properties of g-C3N4/CoAPO-5 hybrids materials were measured by ultraviolet-visible diffuse-reflectance spectroscopy (DRS), photoluminescence (PL) spectra and ultraviolet-visible absorption (UV-Vis) spectra. Under visible-light illumination, this work shows the heterogeneous g-C3N4/CoAPO-5 hybrids present a superior photocatalytic activity.
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24

Yadav, Neetu, and Ashok Kumar Singh. "Dicarbohydrazide based chemosensors for copper and cyanide ions via a displacement approach." New Journal of Chemistry 42, no. 8 (2018): 6023–33. http://dx.doi.org/10.1039/c8nj00230d.

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Ligands attached to pyridine dicarbohydrazide were synthesized and characterized using NMR, FT-IR, elemental analysis, UV-visible spectroscopy, mass spectrophotometry, emission spectra and single crystal X-ray diffraction, and were assessed for their ability to sense copper and cyanide ions.
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25

Kannan, P., and D. Ganjewala. "Preliminary Characterization of Melanin Isolated from Fruits and Seeds of Nyctanthes arbor-tristis." Journal of Scientific Research 1, no. 3 (August 29, 2009): 655–61. http://dx.doi.org/10.3329/jsr.v1i3.2005.

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Melanin from Nyctanthes arbor-tristis fruits and seeds was isolated and purified by alkaline extraction, acid hydrolysis and organic solvents. Each, fruit and seed yielded melanin 50 mg/100g tissue weight. The melanins of fruit and seeds were analyzed by UV-visible and infrared (IR) spectroscopy for characterization. The IR spectrum of fruit and seed melanins did not match with each other and the seed melanin could be distinguished by their sharp peat at 285 nm from the fruit melanin in IR spectrum. Two melanins have shown absorptions above and below 1600 cm-1 in their respective IR spectrum. The melanins thus characterized were tested for their stability after incubating at different temperatures and in presence of oxidants (KMnO4 and K2Cr2O7) and metal ions (Mg++ and Zn++) for a specified period. The stability of the melanin was assessed by measuring changes in the absorbance at 285 nm. The results revealed that the fruit melanin was more stable at 50 ºC while the seed melanin was quite stable at 25 ºC. However, their stability was markedly affected by oxidants and metal ions. Keywords: Melanin; Nyctanthes arbor-tristis; UV-visible spectroscopy; IR-spectroscopy; Oxidant. © 2009 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. DOI: 10.3329/jsr.v1i3.2005 J. Sci. Res. 1 (3), 655-661 (2009)
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26

Prabakaran, Mayakrishnan, Seung-Hyun Kim, Venkatesan Hemapriya, Mayakrishnan Gopiraman, Ick Soo Kim, and Ill-Min Chung. "Rhus verniciflua as a green corrosion inhibitor for mild steel in 1 M H2SO4." RSC Advances 6, no. 62 (2016): 57144–53. http://dx.doi.org/10.1039/c6ra09637a.

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The methanolic extract of the plant Rhus verniciflua was examined as a corrosion inhibitor for mild steel in 1 M H2SO4 through weight loss, UV-visible, FT-IR, electrochemical impedance spectroscopy, and potentiodynamic polarization measurements.
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27

Sbîrna, Liana Simona, Vasilica Muresan, Sebastian Sbîrna, Nicolae Muresana, and Florina Ciolan. "[Au-S 4]Z AND [Au-O2S2] Z – TYPE COMPLEX COMPOUNDS RELATED BY ELECTRON-TRANSFER REACTIONS." SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 15, no. 15 (December 20, 2007): 43–48. http://dx.doi.org/10.48141/sbjchem.v15.n15.2007.47_revistadec2007partial.pdf.

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The synthesis and the properties of square-planar [Au-S 4]Z and [Au-O2S2] Z – type complex compounds, involved in electron-transfer reactions, are presented. The complexes obtained are characterized by elemental analysis, IR, visible, UV, ESR spectroscopy, conductivity, and polarographic data.
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28

Theodorakopoulos, Charis, Vassilis Zafiropulos, Jaap J. Boon, and Stamatis C. Boyatzis. "Spectroscopic Investigations on the Depth-Dependent Degradation Gradients of Aged Triterpenoid Varnishes." Applied Spectroscopy 61, no. 10 (October 2007): 1045–51. http://dx.doi.org/10.1366/000370207782217833.

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The depth-profiles of accelerated aged triterpenoid dammar and mastic varnishes, which had been uncovered by optimized KrF excimer laser ablation (248 nm, 25 ns), were examined by ultraviolet–visible (UV/VIS) spectrophotometry and attenuated total reflection (ATR) Fourier transform infrared (FT-IR) spectroscopy. The results reflect both the optical properties at the bulk (UV/VIS) and the surface (ATR/FT-IR) and establish the presence of degradation gradients across the depth of the degraded natural resin films. It is demonstrated that the UV part of the ambient radiation is absorbed by the deteriorated surface and that the optical densities of the aged varnish decrease as a function of depth. The absorbed UV wavelengths at the surface and the depth-wise reduction of light intensity result in a depth-dependent decrease in carbonyl absorbance and an increase in C–H bending vibration modes of methylene species pointing to structural modification in the triterpenoid mixture across depth.
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29

Chen, Hai Feng, Jia Mei Chen, and Zhi Xue Pan. "Preparation and Photocatalytic Activity of Cu/BiVO4 by Solid State Grinding Method for Degradation of Methyl Orange." Key Engineering Materials 703 (August 2016): 321–25. http://dx.doi.org/10.4028/www.scientific.net/kem.703.321.

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In this work, novel Cu/BiVO4 photocatalyst were prepared by a low-temperature solid state grinding method using Bi (NO3)3•5H2O, NH4VO3 and Cu (NO3)2•2H2O as raw materials. The structure and properties of the samples were characterized by Infrared Spectroscopy (FT-IR), X-ray diffraction (XRD) and UV-vis diffused reflectance spectroscopy (DRS); Using the degradation of methyl orange (MO) as the probe, it was simulated as the degradation of sewage under the visible light to study the influence of the illumination time and the amount of photocatalysts. Compared with the pure BiVO4, the visible-light absorption scope of BiVO4 was broadened by doping Cu, the UV-Visible absorption edges were slightly red shift and the band gap was narrower. Comparatively speaking, the results indicted that the doped Cu enhanced the photocatalytic activities of BiVO4.
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30

Bréchignac, Philippe. "Various Aspects of the Spectroscopy of PAHs (Polycyclic Aromatic Hydrocarbons)." Highlights of Astronomy 12 (2002): 44–47. http://dx.doi.org/10.1017/s1539299600012788.

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AbstractThe exploitation of the recent observations (in particular by ISO) of the near infrared emission bands (UIBs) requires a good knowledge of the spectroscopic properties of the main proposed carriers, i.e. the Polycyclic Aromatic Hydrocarbons, which are expected to act as efficient UV/visible to infrared free-flying light converters.The charge state of the interstellar PAHs strongly affects their spectroscopy. The laboratory study of the electronic transitions of PAH cations in the gas phase enables to address important questions, like their possible contribution to the Diffuse Interstellar Bands (visible and near-IR absorption), and the mechanism responsible for electronic to vibrational intramolecular energy conversion.Microcanonical simulations based on hybrid quantum/classical theoretical methods reveal how strongly affected are the infrared intensities by both the charge state and the vibrational temperature.
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31

Ghammamy, Shahriar. "Synthesis, Spectroscopic Properties of Nickel (II) Complex of the new Bis amide Ligand N, N’- alkanelid bis amide [Ni(NABA)]+." Material Science Research India 9, no. 1 (June 20, 2012): 129–32. http://dx.doi.org/10.13005/msri/090118.

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We describe the synthesis and characterization of a new Nickel (II) complex of the bis amide ligand N, N’- alkanelid bis amide that abbreviated as NABA was synthesized and characterized. Ni (II) Metal complex of this bis amide ligand was prepared by reaction of chloride salt of Ni (II) with NABA. Characterization of the ligand was made by microanalyses, FT-IR,1HNMR and its complex was made by microanalyses, FT-IR and UV–Visible spectroscopy.
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Li, Geng, and You Nan Zhu. "Spectroscopy Characterization of Multi-Treated Yellow Sapphire from Changle, China." Materials Science Forum 833 (November 2015): 90–93. http://dx.doi.org/10.4028/www.scientific.net/msf.833.90.

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Be-diffused yellow sapphires from Changle, Shandong Province, are studied by using magnification observation, ultraviolet-visible (UV-Vis) Spectroscopy, infrared (IR) Spectroscopy and Laser Ablation Inductively Couple Plasma Mass Spectrometer (LA-ICP-MS). The high content of Fe, Ti and Ga, is the typical for sapphire from basalt origin from Changle, while the Be concentrations indicate those sapphire are heated with Be Be diffused,. The IR absorption band at 3310 cm-1 of OH vibration disappears, which suggests those sapphires are heated at high temperature in a highly oxidizing atmosphere. The Fe3+ absorption bands in UV-Vis at 377, 380 and 450 nm, confirm the sapphires are heated in oxidizing atmosphere, while Fe2+-related absorption bands at 735 and 847 nm prove those yellow sapphires are from reducing atmosphere after Be-diffusion. The results of IR, UV-Vis and LA-ICP-MS indicate those yellow sapphire are originally from basalt in Changle and treated through multiple procedures, involved of Be-diffusion in highly oxidizing atmosphere and heat in reducing atmosphere. The Be-diffusion treatment diffuses beryllium into the crystal lattice in oxidizing atmosphere to lighten dark blue tones and make yellow color appear. Moreover, the sapphires undergo second heat treatment in reducing atmosphere after Be-diffusion to reduce the brown tunes of diffused sapphires.
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Fujita, Iwao, Mitsuharu Ishiguchi, Hiroshi Shiota, Takeshi Danjō, and Kouichi Kosai. "Spectroscopic study of polytoluidines in the UV-visible and IR regions." Journal of Applied Polymer Science 44, no. 6 (February 25, 1992): 987–92. http://dx.doi.org/10.1002/app.1992.070440607.

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34

Ubonchonlakate, Kornkanok, Lek Sikong, Tienchai Tontai, and Fumio Saito. "P. aeruginosa Inactivation with Silver and Nickel Doped TiO2 Film Coat on Glass Fiber Riving." Advanced Materials Research 150-151 (October 2010): 1726–31. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.1726.

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The photocatalytic Ag and Ni doped TiO2 films were prepared by sol-gel method and coated on glass fiber roving. The films were calcined at 500 °C for 1 hour with a heating rate of 10°C/min. The surface morphology and properties of synthesized TiO2 films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FT-IR) and UV-vis diffuse reflectance spectroscopy (DRS). The results show that TiO2-1Ag and TiO2-1Ag-1Ni films give rapidly kill P.aeruginosa bacteria under UV irradiation and TiO2-1Ni films give well kill P.aeruginosa bacteria under visible light.
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35

Sun, Xue-Zhong, Peter Portius, David C. Grills, Alexander J. Cowan, and Michael W. George. "Cell Design for Picosecond Time-Resolved Infrared Spectroscopy in High-Pressure Liquids and Supercritical Fluids." Applied Spectroscopy 62, no. 1 (January 2008): 24–29. http://dx.doi.org/10.1366/000370208783412537.

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The design of a new high-pressure infrared (IR) cell for carrying out picosecond time-resolved infrared ( ps-TRIR) spectroscopy in supercritical fluids is described. We have employed thin (2 mm) MgF2 windows in order to overcome possible undesirable nonlinear optical effects caused by the extremely high peak powers of ultrashort ultraviolet (UV)/visible pulses. The design of our cell allows for the study of systems at pressures of up to 5500 psi at temperatures of up to approximately 50 °C. The MgF2 windows enable the excitation of samples with both UV and visible light pulses and these windows are transparent across much of the mid-infrared region. We have demonstrated the use of this cell by examining the photochemistry of Fe(CO)5 in supercritical Kr ( scKr).
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Rasheed, Rashed Taleb. "Preparation and Characterization of TiO2 Nanostructure by TiCl4 Hydrolysis with Additive NaOH." Al-Mustansiriyah Journal of Science 28, no. 2 (April 11, 2018): 100. http://dx.doi.org/10.23851/mjs.v28i2.506.

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Titanium dioxide (TiO2) nanostructures were synthesized via the hydrolysis of TiCl4 in alcohol / water solution/with sodium hydroxide solution in the ice-bath (0-5 ◦C). The particles were char-acterized by using X-ray diffraction technique (XRD), spectroscopy of Ultra Violet-Visible (UV / Visible) and infrared (FT-IR), atomic force microscope (AFM) and scanning electron micro-scope (SEM) analysis were used in order to gain information about the material, morphology, size and the shape of the particles
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37

Sarker, Ashis K. "Formation of Carbon-Silicon Bond and Effect of Silicon on Organic Reactions." Journal of Engineering Science 11, no. 1 (October 5, 2020): 101–5. http://dx.doi.org/10.3329/jes.v11i1.49552.

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In this work, we report carbon-silicon bond formation in thiophene, assisted with alkylated silylchloride. The formylation reaction of silylated thiophene has been discussed and achieved 61% overall yield of reactions. The compounds obtained are characterized quantitatively and qualitatively by using elemental analysis, FT-IR spectroscopy, UV/Visible spectroscopy, and proton NMR spectroscopy. This research work will boost chemists to make the carbon-silicon bond and utilize them in various applications. Journal of Engineering Science 11(1), 2020, 101-105
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38

Guillaume, Kodjo Charles, Zabri Herve, Benie Anoubile, and Estienne Jacques. "Preparation, Spectroscopy, Physicochemical Properties and X-ray Structure Analysis of 3,4,5-TrimethoxyN(2-hydroxybenzylidene) aniline." E-Journal of Chemistry 6, no. 4 (2009): 1103–8. http://dx.doi.org/10.1155/2009/473124.

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3,4,5-TrimethoxyN-(salicylidene) aniline was synthesized and characterized by IR spectroscopy,1H NMR and x-ray single crystal analysis. UV-visible spectroscopy was used for physicochemical tests. X-ray data reveals that the crystalline network cohesion of this compound is essentially assured by CH/pi type hydrogen bounds. It crystallized in the orthorhombic Pbcn space group. Electronic spectroscopy shows that the title compound doesn't present photochromic property but thermochromic one. Intermolecular interactions analysis confirms for this compound a thermochromic structural predisposition.
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39

Hou, Chen Tao, Xia He, Ying Wang, and Wen Jie Nie. "Study on the Preparation and Photocatalytic Property of N, Fe, Zn Nano-TiO2 Loaded on Active Carbon." Advanced Materials Research 356-360 (October 2011): 331–34. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.331.

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In the paper, tetranbutyl titanate was loaded on granular active carbon using sol-gel dip-coating technique to form anatase nano-TiO2 photocatalyst with an average diameter of 16nm doped with N, Fe, Zn ions. The morphology and crystal structure were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and UV–Vis spectrophotometer, respectively. The results show that the prepared photocatalyst demonstrates outstanding photodegradation efficiency and light response zone has transferred from ultraviolet light zone to UV-visible zone. Moreover, considering methylene blue (MB) as target degradation pollutant, under visible light irradiation, the photodegradation rate reached beyond 100% after 1h.
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40

Iramain, Maximiliano A., Lilian Davies, and Silvia Antonia Brandán. "FT-IR, FT-Raman and UV–visible spectra of potassium 3-furoyltrifluoroborate salt." Journal of Molecular Structure 1158 (April 2018): 245–54. http://dx.doi.org/10.1016/j.molstruc.2018.01.040.

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41

Szczesny, Robert, Aleksandra Scigala, Beata Derkowska-Zielinska, Lukasz Skowronski, Christophe Cassagne, Georges Boudebs, Roman Viter, and Edward Szłyk. "Synthesis, Optical, and Morphological Studies of ZnO Powders and Thin Films Fabricated by Wet Chemical Methods." Materials 13, no. 11 (June 4, 2020): 2559. http://dx.doi.org/10.3390/ma13112559.

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Zinc oxide nanoparticles were prepared from Zn5(CO3)2(OH)6 precursor, capped with poly(vinylpyrrolidone) (PVP), and annealed at 600 °C. The obtained powders were characterized by a powder X-ray diffraction (PXD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), UV–visible spectroscopy (UV–vis), Raman spectroscopy, infrared spectroscopy (IR), thermal analysis (TGA/DTA), and third-order nonlinear (NL) optical measurement. Morphological evaluation by TEM and SEM measurements indicated that the precursor micro-particles are ball-shaped structures composed of plates with a thickness of approximately 10 nm. ZnO thin films, as well as ZnO/polymer multilayer layouts, were obtained by wet chemical methods (spin- and dip-coating). Surface topography and morphology of the obtained films were studied by SEM and AFM microscopy. Films with uniformly distributed ZnO plates, due to the erosion of primary micro-particles were formed. The fabricated specimens were also analyzed using a spectroscopic ellipsometry in order to calculate dielectric function and film thickness.
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42

Inoue, Hidenari. "SPECTROSCOPIC AND PHYSICOCHEMICAL METHODS FOR STUDYING THE INTERACTION OF METALLOPORPHYRIN WITH DNA." Indonesian Journal of Chemistry 2, no. 3 (June 9, 2010): 131–34. http://dx.doi.org/10.22146/ijc.21907.

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In recent years studies on the interaction of porphyrin with DNA have received much attention because of the importance in DNA-probing and photodynamic therapy of cancer. A variety of spectroscopic methods, e.g. NMR, ESR, Mössbauer, UV-visible absorption, circular dichroism (CD), magnetic circular dichroism (MCD), IR and Raman spectroscopy, have been employed for studying interactions between porphyrin and DNA. Of these spectroscopic methods, only a few instrumental analytical techniques applicable to an aqueous buffer solution of DNA have been particularly developed to investigate porphyrin-DNA interactions. On the other hand, a number of physicochemical methods, e.g. gel electrophoresis, melting temperature measurements and hydrodynamic methods such as viscosity and sedimentation measurements, have been also used for determining the binding modes of porphyrin to DNA. The present lecture will focus on the application of visible absorption, CD and MCD spectroscopy as well as melting temperature and viscosity measurements to studies of porphyrin-DNA interactions.
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43

Fathy, Hoda M. "INHIBITION OF TUMOUR NECROSIS FACTOR (TNF) ACTIVITY BY A NEW ERGOSTANE STEROID FROM CLEOME DROSERIFOLIA." International Journal of Pharmacy and Pharmaceutical Sciences 10, no. 5 (May 1, 2018): 139. http://dx.doi.org/10.22159/ijpps.2018v10i5.24945.

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Objective: To isolate steroidal compound from Cleome droserifolia and explore its activity against tumour necrosis factor (TNF) using molecular docking studies.Methods: Extraction of the plant material was carried using two successive solvents and three compounds were isolated using column chromatography. The isolated compounds were identified using different spectroscopic data such as 1D, 2D nuclear magnetic resonance (NMR), ultraviolet-visible spectroscopy (UV-Visible), fourier transform infrared spectroscopy (FT-IR) and electrospray ionization mass spectroscopy (ESI-MS). Molecular docking was carried in order to investigate the activity of the ergostane derivative as tumour necrosis factor inhibitor.Results: Two steroidal compounds were isolated and identified as ergost-5,7,9,24 (28)-tetraen-3-one (1) and β-sitosterol glucoside (3) by means of spectroscopic measurement. 1-dodecanol (2) was also isolated. The ergostane derivative showed several binding sites with TNF-αConclusion: The new ergostane derivative isolated from the aerial parts of Cleome droserifolia is introduced to serve as a potential tumour necrosis factor inhibitor and may be used as a lead compound for the treatment of rheumatoid arthritis.
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44

Dindaş, Gizem Başaran, Zeynel Şahin, H. Cengiz Yatmaz, and Ümit İşci. "Cobalt phthalocyanine-TiO2 nanocomposites for photocatalytic remediation of textile dyes under visible light irradiation." Journal of Porphyrins and Phthalocyanines 23, no. 04n05 (April 2019): 561–68. http://dx.doi.org/10.1142/s1088424619500482.

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CoPc(COOH)[Formula: see text]-TiO[Formula: see text] nanocomposites to be used as efficient visible light photocatalysts were obtained by modifying TiO2 nanoparticles with cobalt(II) tetracarboxyphthalocyanine (CoPc(COOH)[Formula: see text]). The photocatalyst was then characterized by ultra-violet diffuse reflectance spectroscopy (UV-DRS), Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). The UV-DRS spectra showed that the absorbance spectrum of the modified catalyst was shifted to the visible region. Different textile dye solutions of Reactive Red 180, Acid Red 88 and Direct Orange 46 were efficiently degraded under visible light. Color removal rates were established to be 30%, 53% and 47% after 180 min for RR180, AR88 and DO46 dyes, respectively. The optimum catalyst concentration was determined to be 1 g/L of CoPc(COOH)[Formula: see text]-TiO[Formula: see text]. Development of the CoPc(COOH)[Formula: see text]-TiO[Formula: see text] nanocomposite photocatalyst enabled the utilization of visible light irradiation for efficient photodegradation of organic textile dye solutions.
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45

Zhong, Shu Yu, Hai Shao Ye, Ji Qi Jiang, Qian Yang, and Pei Song Tang. "Preparation of LaVO4 by Microwave Process and its Photocatalytic Activity." Materials Science Forum 852 (April 2016): 538–41. http://dx.doi.org/10.4028/www.scientific.net/msf.852.538.

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Using La (NO3)3·6H2O, NH4VO3, citric acid as the main raw materials, nanocrystalline LaVO4 sample was prepared by microwave method. The structure and morphology of sample were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-visible diffuse reflectance spectroscopy (DRS) and Fourier Transform Infrared (FT-IR) spectroscopy. The photocatalytic activity of LaVO4 was studied for methyl orange (MO) used as simulated sewage. The XRD and SEM showed that the particle size of LaVO4 was about 80-100 nm. The DRS showed that LaVO4 had optical absorption onset of 356 nm, indicating the optical band gap of 3.48 eV. The FT-IR showed that LaVO4 had vibration peaks of Fe-O and V-O bond. Under UV-light, the photocatalytic experiment indicated that the prepared LaVO4 nanocrystalline had highly photocatalytic activity for degradation of methyl orange.
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46

Tanigaki, Nobutaka, Chikayo Takechi, Shuichi Nagamatsu, Toshiko Mizokuro, and Yuji Yoshida. "Oriented Thin Films of Insoluble Polythiophene Prepared by the Friction Transfer Technique." Polymers 13, no. 15 (July 21, 2021): 2393. http://dx.doi.org/10.3390/polym13152393.

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A thin film of unsubstituted polythiophene (PT), an insoluble conjugated polymer, with molecular chains uniaxially oriented in plane was prepared by the friction transfer method. The structure of highly oriented thin films of PT was investigated using grazing-incidence X-ray diffraction (GIXD), ultraviolet–visible (UV–vis) spectroscopy, and infrared (IR) spectroscopy. The polarized UV–vis and IR spectra and GIXD measurements showed the PT molecular chains were well aligned in parallel to the friction direction. The GIXD studies clarified that the polymer backbones were aligned with very narrow distribution, such that the half-width was about 4 degrees. The degree of orientation of the PT friction-transferred film was higher compared with those of regioregular poly(3-alkylthiophene)s. Moreover, the GIXD results show a preferred orientation where the a-axis is perpendicular to the substrate plane.
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47

Alghdeir, Malek, Khaled Mayya, and Mohamed Dib. "Characterization of Nanosilica/Low-Density Polyethylene Nanocomposite Materials." Journal of Nanomaterials 2019 (March 20, 2019): 1–8. http://dx.doi.org/10.1155/2019/4184351.

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Six ratios of nanosilica particles were employed to fabricate low-density polyethylene (LDPE) composites using melt mixing and hot molding methods. Several composite films with different ratios (0.5, 1, 2.5, 5, 7.5, and 10 wt%) of SiO2 were prepared. The obtained composite films were identified and characterized by Fourier-transform infrared spectroscopy (FTIR) and ultraviolet-visible spectroscopy (UV-VIS). At a specific mixing ratio, far infrared radiation transmittance was prohibited while the ultraviolet-visible transmittance is allowed; this will be explained in detail. Optical measurements show that the composite films prevent the transmission of IR radiation near 9 μm and allow UV-VIS transmission during sun-shining time. The mechanical behaviour of a nanosilica-reinforced LDPE composite was studied using tensile tests. The addition of 1 wt% nanosilica has successfully enhanced the mechanical properties of the LDPE material.
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48

Zhang, Ying, Cheng Jun QIU, You Li, Wen Long Zhang, and Xuan Wang. "A New Type of EO Polymer Based on Polyphosphazenes." Advanced Materials Research 981 (July 2014): 932–35. http://dx.doi.org/10.4028/www.scientific.net/amr.981.932.

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Polyphosphazenes containing carbazole grafted by azo nitrobenzene is synthesized by microwave method in this paper. Its structure is characterized by infrared (IR) spectroscopy and UV-visible spectroscopy. This new polymer, with both electro-optic(EO) property and photoconductive property, has unique stability and can be easily processed. Terahertz(THz) wave can be detected using the device which is made with our new polymer. The time domain waveform and frequency spectrum of the THz wave are obtained.
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49

Abdurrahmanoğlu, Şaziye, Mevlüde Canlıca, John Mack, and Tebello Nyokong. "Pyridone substituted phthalocyanines: Photophysico-chemical properties and TD-DFT calculations." Journal of Porphyrins and Phthalocyanines 22, no. 01n03 (January 2018): 25–31. http://dx.doi.org/10.1142/s1088424617500730.

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4-(6-methyl-3-nitro-2-oxo-1,2-dihydropyridin-4-yloxy)phthalonitrile has been used to prepare a novel Zn(II) phthalocyanines with four peripheral pyridone substituents. The compound has been characterized by UV-visible absorption, FT-IR and [Formula: see text]H-NMR spectroscopy, elemental analysis and MALDI-TOF mass spectroscopy. The fluorescence, triplet quantum and singlet oxygen quantum yields have been determined and TD-DFT calculations have been used to identify trends in the electronic structure.
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50

Callahan, Michael P., Bridgit Crews, Ali Abo-Riziq, Louis Grace, Mattanjah S. de Vries, Zsolt Gengeliczki, Tiffani M. Holmes, and Glake A. Hill. "IR-UV double resonance spectroscopy of xanthine." Physical Chemistry Chemical Physics 9, no. 32 (2007): 4587. http://dx.doi.org/10.1039/b705042a.

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