scholarly journals Photoluminescence Quenching of a Novel Electroconductive Poly(propylene thiophenoimine)-co-Poly(ethylenedioxy thiophene) Star Copolymer

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2894
Author(s):  
Anne Lutgarde Djoumessi Yonkeu ◽  
Miranda Mengwi Ndipingwi ◽  
Chinwe Ikpo ◽  
Kelechi Nwambaekwe ◽  
Sodiq Yussuf ◽  
...  
Keyword(s):  
Bathochromic Shift ◽  
Spectroscopic Studies ◽  
Electrochemical Analysis ◽  
Photoluminescence Quenching ◽  
Naphthalene Diimide ◽  
Highest Occupied Molecular Orbital ◽  
The Fourier Transform ◽  
Poly Propylene ◽  
Conductive Properties ◽  
Star Copolymer

A generation 1 poly(propylene thiophenoimine)-co-poly(ethylenedioxy thiophene) (G1PPT-co-PEDOT) star copolymer, which exhibits a strong optical absorption over a broad range in the ultraviolet–visible (UV-Vis) region and with good electro/conductive properties, was chemically prepared for the first time. Synthesis of the star copolymer, G1PPT-co-PEDOT was confirmed by spectroscopic studies. Indeed, the disappearance of the very high intensity bands, C–H bending at α-position (687 cm−1), and C=N stretching (1620 cm−1) in the Fourier transform infrared spectroscopy (FTIR) of G1PPT-co-PEDOT, which were initially present in the spectrum of the thiolated starting material, G1PPT, confirmed copolymerization. Furthermore, a large bathochromic shift in the onset wavelength of the UV-Vis absorbance spectra from 367 nm in G1PPT to 674 nm in G1PPT-co-PEDOT further attests of successful copolymerization. The electrochemical analysis of G1PPT-co-PEDOT achieved a highest occupied molecular orbital (HOMO) energy level value of 5.3 eV, which is reminiscent of the value for an ideal electron-donor material. Photoluminescence quenching of up to 82% was observed in solution blends of the G1PPT-co-PEDOT star copolymer and N,N′-diisopropyl naphthalene diimide (NDI). This demonstrates the occurrence of photoinduced intermolecular charge transfer (PICT) from the electron-donating G1PPT-co-PEDOT to the electron accepting NDI, a good property, beneficial for optoelectronic and photovoltaic applications.

scholarly journals Spectroscopic Studies and Vibrational Assignments, Homo- Lumo, UV-VIS, NBO Analysis of Benzonitrile

2020 ◽  
Vol 13 (3) ◽  
pp. 225-239
Author(s):  
K. Rajalakshmi ◽  
S. Sharmila
Keyword(s):  
Molecular Orbital ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Spectroscopic Studies ◽  
Nbo Analysis ◽  
Functional Theory ◽  
Vibrational Assignments ◽  
Highest Occupied Molecular Orbital ◽  
Lowest Unoccupied Molecular Orbital ◽  
The Fourier Transform

The Fourier transform infrared and FT-Raman spectra of Benzonitrile have been recorded in region of 4000-400 and 4000-100 cm -1 respectively. A complete assignments and analysis of fundamental vibrational modes of the molecule have been carried out. The observed fundamental modes have been compared with harmonic vibrational frequencies computed using ab initio and density functional theory calculations by employing B3LYP functional at 6-311G(d, p) level and HF/6-311G(d, p).UV-Vis spectrum of the compound has been recorded, the natural bond orbital (NBO) electronic properties, such as highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energies have been calculated with B3LYP/6-311G(d, p) level. These calculated energies show that charge transfer occurs within molecule. NBO analysis, thermodynamics properties and Mulliken charges of the title molecule are also calculated and interpreted

Synthesis and characterization of poly(propylene imine) dendrimer – Polypyrrole conducting star copolymer

2011 ◽  
Vol 652 (1-2) ◽  
pp. 18-25 ◽  
Author(s):  
Abd Almonam A. Baleg ◽  
Nazeem M. Jahed ◽  
Omotayo A. Arotiba ◽  
Stephen N. Mailu ◽  
Nicolette R. Hendricks ◽  
...  
Keyword(s):  
Synthesis And Characterization ◽  
Poly Propylene ◽  
Star Copolymer

scholarly journals Low cost, highly sensitive and selective electrochemical detection of arsenic (III) using silane grafted based nanocomposite

2019 ◽  
Vol 25 (4) ◽  
pp. 579-587 ◽  
Author(s):  
Jongte Lalmalsawmi ◽  
Zirlianngura ◽  
Diwakar Tiwari ◽  
Seung-Mok Lee
Keyword(s):  
Low Cost ◽  
Anodic Stripping Voltammetry ◽  
Reduction Process ◽  
Stripping Voltammetry ◽  
Spectroscopic Studies ◽  
Single Step ◽  
Carbon Paste ◽  
Electron Microscopic ◽  
Relative Standard ◽  
The Fourier Transform

Novel silane grafted bentonite was obtained using the natural bentonite as precursor material. The material which is termed as nanocomposite was characterized by the Fourier Transform Infra-red (FT-IR) and X-ray diffraction (XRD) methods. The surface imaging and elemental mapping was performed using Scanning Electron Microscopic (SEM/EDX) technique. The electroanalytical studies were performed using the nanocomposite electrode. The electroactive surface area of nanocomposite electrode was significantly increased than the pristine bentonite or bare carbon paste based working electrode. The impedance spectroscopic studies were conducted to simulate the equivalent circuit and Nyquist plots were drawn for the carbon paste electrode and nanocomposite electrodes. A single step oxidation/reduction process occurred for As(III) having ΔE value 0.36 V at pH 2.0. The anodic stripping voltammetry was performed for concentration dependence studies of As(III) (0.5 to 20.0 μg/L) and reasonably a good linear relationship was obtained. The detection limit of the As(III) detection was calculated as 0.00360±0.00002 μg/L having with observed relative standard deviations (RSD) less than 4%. The presence of several cations and anions has not affected the detection of As(III) however, the presence of Cu(II) and Mn(II) affected the detection of As(III). The selectivity of As(III) was achieved using the Tlawng river water sample spiked with As(III).

scholarly journals A NEW CLASS OF IONIC SOLVENTS, ELECTROLYTES AND ENGINEERING FLUIDS BASED ON 1,3-ALKYLMETHYL-1,2,3-BENZOTRIAZOLIUM SALTS

2010 ◽  
Vol 6 (2) ◽  
pp. 111-116 ◽  
Author(s):  
Ahmad Mudzakir
Keyword(s):  
Ionic Liquids ◽  
Single Crystal ◽  
Thermal Analyses ◽  
Spectroscopic Studies ◽  
Electrochemical Analysis ◽  
Electrochemical Characteristics ◽  
Melting Points ◽  
X Ray ◽  
Good Thermal Stability ◽  
New Class

A new series of ionic liquids based on 1,3-alkylmethyl-1,2,3-benzotriazolium cation has been prepared. The spectroscopic, physical and electrochemical characteristics of this family of salts have been investigated with respect to potential usage as ionic solvents, electrolytes and engineering fluids. Incorporation of diverse anions including weak coordinating anion and pseudohalide with this benzotriazolium cation produces ionic liquids with advantageously low melting points and good thermal stability. Thermal analyses of these very stable salts included the determination of melting points (-65 to 164 oC) and decomposition temperatures (up to 291 oC). The electrochemical windows of representative benzotriazolium species has been investigated by cyclic voltammetry and determined to be ~ 3 V. The X-ray single crystal and spectroscopic studies revealed that weak hydrogen-bonding interactions between the benzotriazolium ring protons and the anions are present both in the solid state as well as in solution.   Keywords: ionic liquids, X-ray single crystal, thermal analysis, electrochemical analysis, benzotriazolium salt

scholarly journals Gravimetric and Spectroscopic Studies of Reversible Hydrogen Sorption on Nanoporous Clinoptilolite

2014 ◽  
Vol 51 (3) ◽  
pp. 35-41
Author(s):  
P. Lesnicenoks ◽  
L. Grinberga ◽  
J. Kleperis
Keyword(s):  
Ion Exchange ◽  
Hydrogen Uptake ◽  
Spectroscopic Studies ◽  
Light Metal ◽  
Hydrogen Sorption ◽  
Adsorbed Hydrogen ◽  
Thermogravimetric Method ◽  
Hydrogen Molecules ◽  
The Fourier Transform ◽  
Natural Clinoptilolite

Abstract Large surface aluminosilicate compounds such as zeolites are not the best option for hydrogen storage due to their low hydrogen sorption capacity above cryogenic temperatures. However, the known crystal structure and easy ion exchange allows considering zeolites as easily tuneable media that with a little effort can be changed to suitable porous media for hydrogen sorption. Metal (Li, Mg) and ammonia ion exchange is performed in natural clinoptilolite samples with the aim to increase the amount of adsorbed hydrogen. The Fourier transform infrared spectroscopy of the prepared samples is used to study sorption of hydrogen molecules in the vicinity of light metal ions. An original thermogravimetric method is applied to characterise the amount of sorbed hydrogen. Our experiments show that the highest hydrogen uptake (~ 6.2 wt%) is for a clinoptilolite sample treated in acid. The cation exchange did not provide the expected hydrogen sorption capability; however, the amount of sorbed hydrogen exceeded that for the initial material.

scholarly journals Morphological and spectroscopic analysis of snow and glacier algae and their parasitic fungi on different glaciers of Svalbard

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Marta J. Fiołka ◽  
Nozomu Takeuchi ◽  
Weronika Sofińska-Chmiel ◽  
Sylwia Wójcik-Mieszawska ◽  
Tristram Irvine-Fynn ◽  
...  
Keyword(s):  
Spectroscopic Analysis ◽  
Algal Species ◽  
High Arctic ◽  
Spectroscopic Studies ◽  
Calcofluor White ◽  
Force Microscopy ◽  
Parasitic Fungi ◽  
Atomic Force ◽  
Cyst Cells ◽  
The Fourier Transform

AbstractThe results show the morphological analyses and spectroscopic studies of snow and glacier algae and their parasitic fungi in Svalbard (High Arctic). Fixed algal cells of two species, Sanguina nivaloides and Ancylonema nordenskioeldii, were imaged using light microscopy, scanning electron microscopy (SEM), and atomic force microscopy (AFM). Fluorescence microscopy using Calcofluor white stain supported the observations of parasitic fungi on the algal cells. Images in brightfield microscopy showed chytrid-like fungi penetrating the cells of both algal species. Parasites were found to colonize the cells of A. nordenskioeldii and hypnozygotes of S. nivaloides, while no fungi infected the cyst stages of S. nivaloides. The autofluorescence analysis revealed the ability of S. nivaloides to glow when excited with different wavelengths, while A. nordenskioeldii did not fluoresce. The hypnozygotes of S. nivaloides emitted brighter fluorescence than the cysts, and the most intense luminosity was observed in the UV range. The Fourier-transform infrared spectroscopy (FTIR) and energy-dispersive X-ray spectroscopy (EDS) spectroscopic analysis showed differences in the chemical composition between samples collected from three different sites. Samples dominated by cyst cells were characterized by the presence of an abundant polysaccharide envelope.

(BETS)2[RuX5NO] (X=Cl, Br): an explanation of different conductive properties through structural and spectroscopic studies

2006 ◽  
Vol 142 (3-4) ◽  
pp. 445-448 ◽  
Author(s):  
L. Valade ◽  
I. Malfant ◽  
A. Glaria ◽  
J. F. Lamère ◽  
B. Garreau de Bonneval ◽  
...  
Keyword(s):  
Spectroscopic Studies ◽  
Conductive Properties

scholarly journals Synthesis, spectroscopic characterization and computational studies of Schiff base complexes of tin(IV) chloride

2019 ◽  
Vol 42 (1) ◽  
pp. 28-36
Author(s):  
Nitesh Jaiswal ◽  
Ajeet Kumar Kushwaha ◽  
Avadhesh Pratap Singh ◽  
Raj Kumar Dubey
Keyword(s):  
Molecular Orbital ◽  
Density Functional ◽  
Molecular Geometry ◽  
Spectroscopic Characterization ◽  
Spectroscopic Studies ◽  
Schiff Base Complexes ◽  
Molar Ratios ◽  
Highest Occupied Molecular Orbital ◽  
Computational Calculations ◽  
Lowest Unoccupied Molecular Orbital

Abstract Reaction of anhydrous tin(IV) chloride with mono functional bidentate Schiff bases (sbnH), in 1:2 molar ratios, gives complexes of the type, [(sbn)2SnCl2] (1-4) (where, n=1-4; sb=2-(((4-chlorophenyl)imino)methyl)phenol, sb1H, I; 2-(((4-bromophenyl)imino)methyl) phenol, sb2H, II; 2-(((4-chlorophenyl)imino)methyl)-6-methoxyphenol, sb3H, III and 2-(((4-bromo phenyl)imino)methyl)-6-methoxyphenol, sb4H, IV. All the tin(IV) complexes (1-4) were colored solid and soluble in organic solvents. The synthesized complexes were characterized by elemental analysis (C, H, N and Sn), IR, UV-Vis, NMR (1H, 13C and 119Sn) spectroscopy and mass spectrometry. On the basis of spectroscopic studies, six coordination around tin atom has been proposed tentatively. The computational calculations using density functional theory (DFT) of ligands and complexes were also performed to obtained optimized molecular geometry, the highest occupied molecular orbital (HOMO), the lowest unoccupied molecular orbital (LUMO) and other parameter.

Laser light beating spectroscopic studies of dynamics in bulk polymers: poly(propylene glycol)

1981 ◽  
Vol 14 (5) ◽  
pp. 1363-1370 ◽  
Author(s):  
C. H. Wang ◽  
G. Fytas ◽  
D. Lilge ◽  
T. Dorfmueller
Keyword(s):  
Propylene Glycol ◽  
Laser Light ◽  
Spectroscopic Studies ◽  
Bulk Polymers ◽  
Poly Propylene
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