scholarly journals Analog Retinal Redshifts Visible Absorption of QuasAr Transmembrane Voltage Sensors into Near‐infrared

2019 ◽  
Vol 96 (1) ◽  
pp. 55-66
Author(s):  
Gaoxiang Mei ◽  
Natalia Mamaeva ◽  
Srividya Ganapathy ◽  
Peng Wang ◽  
Willem J. DeGrip ◽  
...  
Keyword(s):  
Near Infrared ◽  
Visible Absorption ◽  
Voltage Sensors ◽  
Transmembrane Voltage

A new form of hydroxyaluminum phthalocyanine by acid treatment. Characterization and photoactivity

1988 ◽  
Vol 66 (7) ◽  
pp. 1609-1616 ◽  
Author(s):  
LÊ H. Dao ◽  
Gérard Perrier ◽  
Kenneth Cole
Keyword(s):  
Acid Treatment ◽  
Near Infrared ◽  
Absorption Spectrometry ◽  
Acid Solutions ◽  
Solar Cell Device ◽  
Visible Absorption ◽  
X Ray ◽  
Photoelectrochemical Solar Cell ◽  
Aqueous Acid ◽  
New Form

A new polymorph of hydroxyaluminum phthalocyanine (PcAlOH) was obtained when PcAlOH thin film was exposed to aqueous acid solutions. The new polymorph, which is characterized by infrared, near-infrared, and visible absorption spectrometry and X-ray diffractometry, shows enhanced photoactivity in a photoelectrochemical solar cell device.

scholarly journals Synthesis, Characterization, Electrochemistry, and Spectroscopic Properties of Some Anthracenyl Functionalized Phthalocyanine Complexes of Ruthenium(II)

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Adewale O. Adeloye ◽  
Peter A. Ajibade
Keyword(s):  
Near Infrared ◽  
Spectroscopic Properties ◽  
Major Product ◽  
Electrophilic Aromatic Substitution ◽  
Aromatic Substitution ◽  
Dimeric Complex ◽  
Visible Absorption ◽  
Phthalocyanine Complex ◽  
Elemental Analyses ◽  
C Nmr

The synthesis of single- and double-decked anthracenyl functionalized ruthenium(II) phthalocyanine complexes has been achieved through a controlled electrophilic aromatic substitution reaction of the free unsubstituted ruthenium(II) phthalocyanine with preformed 9-bromo-10-(2,3-dimethylacrylic acid)-anthracene and/or 9-bromo-10-(2,3-dimethylacrylic acid)-dianthracene using 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) as catalyst. The complexes were characterized by IR, UV-Vis, fluorescence,1H,13C NMR, and elemental analyses. A dimeric complex (C3R′′RuPc, whereR′′is 9-dianthracenyl-10-(2,3-dimethylacrylic acid), obtained as the major product of the dianthracenyl-substituted ruthenium phthalocyanine complex displays a strong near-infrared visible absorption band wavelength maxima at 1027 nm (ε=5.47×103 M−1 cm−1), with an interesting photoluminescent and electroredox active properties.

scholarly journals Synthesis, Characterization, and Low Temperature Sintering of Nanostructured BaWO4for Optical and LTCC Applications

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
S. Vidya ◽  
Sam Solomon ◽  
J. K. Thomas
Keyword(s):  
Electron Microscopy ◽  
Dielectric Constant ◽  
Low Temperature ◽  
Band Gap ◽  
Near Infrared ◽  
Wide Band ◽  
Ultraviolet Region ◽  
Antireflection Coatings ◽  
Visible Absorption ◽  
Transparent Films

Synthesis of nano-BaWO4by a modified combustion technique and its suitability for various applications are reported. The structure and phase purity of the sample analyzed by X-ray diffraction, Fourier transform Raman, and infrared spectroscopy show that the sample is phase pure with tetragonal structure. The particle size from the transmission electron microscopy is 22 nm. The basic optical properties and optical constants of the nano BaWO4are studied using UV-visible absorption spectroscopy which showed that the material is a wide band gap semiconductor with band gap of 4.1 eV. The sample shows poor transmittance in ultraviolet region while maximum in visible-near infrared regions. The photoluminescence spectra show intense emission in blue region. The sample is sintered at low temperature of 810°C, without any sintering aid. Surface morphology of the sample is analyzed by scanning electron microscopy. The dielectric constant and loss factor measured at 5 MHz are 9 and1.56×10-3. The temperature coefficient of dielectric constant is −22 ppm/°C. The experimental results obtained in the present work claim the potential use of nano BaWO4as UV filters, transparent films for window layers on solar cells, antireflection coatings, scintillators, detectors, and for LTCC applications.

Measurements of the Rate Constant of HO2+ NO2+ N2→ HO2NO2+ N2Using Near-Infrared Wavelength-Modulation Spectroscopy and UV−Visible Absorption Spectroscopy

2004 ◽  
Vol 108 (1) ◽  
pp. 80-91 ◽  
Author(s):  
Lance E. Christensen ◽  
Mitchio Okumura ◽  
Stanley P. Sander ◽  
Randall R. Friedl ◽  
Charles E. Miller ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Rate Constant ◽  
Near Infrared ◽  
Wavelength Modulation Spectroscopy ◽  
Wavelength Modulation ◽  
Visible Absorption ◽  
Modulation Spectroscopy ◽  
Infrared Wavelength ◽  
Uv Visible ◽  
Visible Absorption Spectroscopy

Near-Infrared and Visible Absorption Spectroscopy of Nano-Energetic Materials Containing Aluminum and Boron

2005 ◽  
Vol 30 (3) ◽  
pp. 171-177 ◽  
Author(s):  
Yanqiang Yang ◽  
Shufeng Wang ◽  
Zhaoyong Sun ◽  
Dana D. Dlott
Keyword(s):  
Absorption Spectroscopy ◽  
Energetic Materials ◽  
Near Infrared ◽  
Visible Absorption ◽  
Visible Absorption Spectroscopy

A Selective Cation Exchange Strategy for the Synthesis of Colloidal Yb3+-Doped Chalcogenide Nanocrystals with Strong Broadband Visible Absorption and Long-Lived Near-Infrared Emission

2017 ◽  
Vol 139 (34) ◽  
pp. 11814-11824 ◽  
Author(s):  
Sidney E. Creutz ◽  
Rachel Fainblat ◽  
Younghwan Kim ◽  
Michael C. De Siena ◽  
Daniel R. Gamelin
Keyword(s):  
Cation Exchange ◽  
Near Infrared ◽  
Infrared Emission ◽  
Visible Absorption ◽  
Near Infrared Emission

scholarly journals Optical Switching Between Long‐lived States of Opsin Transmembrane Voltage Sensors

2021 ◽  
Author(s):  
Gaoxiang Mei ◽  
Cesar M. Cavini ◽  
Natalia Mamaeva ◽  
Peng Wang ◽  
Willem J. DeGrip ◽  
...  
Keyword(s):  
Optical Switching ◽  
Voltage Sensors ◽  
Transmembrane Voltage

Improving the electrical and optical properties of C50 fullerene using the Donor-Acceptor groups

2021 ◽  
Author(s):  
Ali Ayoubikaskooli ◽  
Abdol Mohammad Ghaedi ◽  
Hamid Reza Shamlouei ◽  
Yadollah Saghapour
Keyword(s):  
Optical Properties ◽  
Near Infrared ◽  
Infrared Region ◽  
Absorption Bands ◽  
Visible Absorption ◽  
Acceptor Group ◽  
Donor And Acceptor ◽  
Donor Acceptor ◽  
Linear Optical Properties ◽  
Uv Visible

Abstract In this research, the C50 fullerene was employed as the source of the π electrons and the electron donor-acceptor groups were used to enhance its optical properties. Considerable enhancement in its electronic and optical property of as the result of donor and acceptor group presence was observed. For instance, in UV-Visible absorption spectrum, the number of absorption lines significantly increase which may be the relaxation of the electronic transition selection rules. Considerably, the substituted forms of C50, has numbers of absorption bands in near infrared region. The BH2–C50-NCH3Li and NO–C50-NCH3Li molecules have superior improvement in optical properties. Finally, the donor and acceptor groups influence on non-linear optical properties (NLO) of C50 were explored and the considerable improvement in NLO properties of C50 was observed which the NLO improvements for BH2-C50-NCH3Li and NO-C50-CH2Li cases is higher than others.

scholarly journals Regulation of Eag1 gating by its intracellular domains

eLife ◽  
2019 ◽  
Vol 8 ◽  
Author(s):  
Jonathan R Whicher ◽  
Roderick MacKinnon
Keyword(s):  
Potassium Channels ◽  
Membrane Voltage ◽  
Specific Interactions ◽  
Voltage Sensors ◽  
Voltage Gated ◽  
Open Conformation ◽  
Channel Opening ◽  
Transmembrane Voltage ◽  
Voltage Dependent ◽  
Intracellular Domains

Voltage-gated potassium channels (Kvs) are gated by transmembrane voltage sensors (VS) that move in response to changes in membrane voltage. Kv10.1 or Eag1 also has three intracellular domains: PAS, C-linker, and CNBHD. We demonstrate that the Eag1 intracellular domains are not required for voltage-dependent gating but likely interact with the VS to modulate gating. We identified specific interactions between the PAS, CNBHD, and VS that modulate voltage-dependent gating and provide evidence that VS movement destabilizes these interactions to promote channel opening. Additionally, mutation of these interactions renders Eag1 insensitive to calmodulin inhibition. The structure of the calmodulin insensitive mutant in a pre-open conformation suggests that channel opening may occur through a rotation of the intracellular domains and calmodulin may prevent this rotation by stabilizing interactions between the VS and intracellular domains. Intracellular domains likely play a similar modulatory role in voltage-dependent gating of the related Kv11-12 channels.

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