Spectroscopic Studies of the Simpler Porphyrins IV. The Absorption and Fluorescence Spectra of ms‐Tetra(3′,4′‐methylenedioxyphenyl)porphine of HCl Number Four and of Its AgC5H5N, Zn, and Ni Complex Salts

1942 ◽  
Vol 10 (12) ◽  
pp. 700-705 ◽  
Author(s):  
V. M. Albers ◽  
H. V. Knorr ◽  
David L. Fry
Keyword(s):  
Fluorescence Spectra ◽  
Spectroscopic Studies ◽  
Absorption And Fluorescence Spectra ◽  
Complex Salts

Spectroscopic Studies of the Energy Levels of the Nd3+ Ion in Single Crystals of SrO.6Al2O3

1988 ◽  
Vol 41 (4) ◽  
pp. 549 ◽  
Author(s):  
H Tajalli
Keyword(s):  
Raman Spectroscopy ◽  
Fluorescence Spectra ◽  
Energy Levels ◽  
Selective Excitation ◽  
Spectroscopic Studies ◽  
Solid State Laser ◽  
Host Lattice ◽  
Absorption And Fluorescence Spectra ◽  
Excitation Spectra ◽  
Laser Material

A detailed study of the polarised absorption and fluorescence spectra and the selective excitation spectra of the Nd3+ ion in the SrO.6Al20 3 host lattice was carried out over the temperature range 4�2 to 500 K. The empirical energy level schemes were determined for two dominant sites of Nd3+ in SrO.6Al20 3 up to 20000 cm -1. The intensity, linewidth and thermal shifts of the transition lines with 4f3 configuration were investigated. The vibrational transitions of Nd3 + : srO.6Al20 3 were also investigated using Raman spectroscopy. The results of the study provide information on the suitability of Nd3+ : srO.6Al20 3 as a solid state laser material.

Spectroscopic properties of the Pr3+ ion in TeO2-WO3-PbO-La2O3 and TeO2-WO3-PbO-Lu2O3 glasses

Open Physics ◽  
2014 ◽  
Vol 12 (1) ◽  
Author(s):  
Bożena Burtan ◽  
Maciej Sitarz ◽  
Radosław Lisiecki ◽  
Witold Ryba-Romanowski ◽  
Piotr Jeleń ◽  
...  
Keyword(s):  
Refractive Index ◽  
Dispersion Relation ◽  
Fluorescence Spectra ◽  
Tellurite Glass ◽  
Spectroscopic Properties ◽  
Spectroscopic Studies ◽  
Luminescence Decay ◽  
Absorption And Fluorescence Spectra ◽  
Ofelt Theory ◽  
Glass Matrices

AbstractThe goal of this work was to investigate the spectroscopic properties of Pr3+ ions, embedded in two different tellurite glass matrices, TeO2-WO3-PbO-La2O3 and TeO2-WO3-PbO-Lu2O3. The absorption and fluorescence spectra have been recorded and analyzed in terms of the Judd-Ofelt theory along with the luminescence decay of the 3P0 and 1D2 levels of the Pr3+ ion. The spectroscopic studies were completed with ellipsometric measurements providing the dispersion relation of the refractive index of the investigated glasses.

scholarly journals Spectroscopic studies of the binding of bilirubin by ligandin and aminoazo-dye-binding protein A

1976 ◽  
Vol 157 (1) ◽  
pp. 211-216 ◽  
Author(s):  
E Tipping ◽  
B Ketterer ◽  
L Christodoulides ◽  
G Enderby
Keyword(s):  
Association Constant ◽  
Fluorescence Spectra ◽  
Binding Protein ◽  
Protein A ◽  
Spectroscopic Studies ◽  
Absorption And Fluorescence Spectra ◽  
Quantitative Studies ◽  
Dye Binding ◽  
Cotton Effects ◽  
Unbound Bilirubin

Ligandin and aminoazo-dye-binding protein A both bind bilirubin at a single site. Quantitative studies of the interactions using difference spectrophotometry show that at pH 7.0, protein A binds the tetrapyrrole with an association constant (K) greater than or equal to 2 × 10(7) litre/mol, whereas binding by ligandin is slightly weaker (K = 7 × 10(6) litre/mol) at this pH. The protein-bilirubin complexes give rise to absorption and fluorescence spectra quite different from those of unbound bilirubin and also to large Cotton effects. It appears that on binding to both proteins, the ligand is forced into a rigid twisted configuration in a hydrophobic environment. Ligandin and protein A resemble serum albumin in their interactions with bilirubin.

Cobaloxime-Based Double Complex Salts as Efficient and Versatile Catalysts for the Light-Driven Hydrogen Evolution Reaction

2020 ◽  
Author(s):  
Elisabeth Hofmeister ◽  
Jisoo Woo ◽  
Tobias Ullrich ◽  
Lydia Petermann ◽  
Kevin Hanus ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Systematic Study ◽  
Cobalt Complexes ◽  
Spectroscopic Studies ◽  
Double Complex ◽  
Double Complex Salts ◽  
Noble Metal Catalysts ◽  
Reduction Potentials ◽  
Complex Salts

Cobaloximes and their BF<sub>2</sub>-bridged analogues have emerged as promising non-noble metal catalysts for the photocatalytic hydrogen evolution reaction (HER). Herein we report the serendipitous discovery that double complex salts such as [Co(dmgh)<sub>2</sub>py<sub>2</sub>]<sup>+</sup>[Co(dmgBPh<sub>2</sub>)<sub>2</sub>Cl<sub>2</sub>]<sup>-</sup> can be obtained in good yields by treatment of commercially available [Co(dmgh)<sub>2</sub>pyCl] with triarylboranes. A systematic study on the use of such double complex salts and their single salts with simple counterions as photocatalysts revealed HER activities comparable or superior to existing cobaloxime catalysts and suggests ample opportunities for this compound class in catalyst/photosensitizer dyads and immobilized architectures. Preliminary electrochemical and spectroscopic studies indicate that one key advantage of these charged cobalt complexes is that the reduction potentials as well as the electrostatic interaction with charged photosensitizers can be tuned.

A phthalocyanine-based fluorescent sensor for Zn2+ ion

2013 ◽  
Vol 17 (01n02) ◽  
pp. 99-103 ◽  
Author(s):  
Hui He ◽  
Jian-Yong Liu ◽  
Dennis K.P. Ng
Keyword(s):  
Metal Ions ◽  
Spectral Properties ◽  
Fluorescence Spectra ◽  
Near Infrared ◽  
Fluorescent Sensor ◽  
High Sensitivity ◽  
Absorption And Fluorescence Spectra

This paper describes the preparation and spectral properties of a near-infrared fluorophore in which two bis(2-picolyl)amino moieties are axially linked to a silicon(IV) phthalocyanine core. The effects of various metal ions on its absorption and fluorescence spectra have been examined. The results indicate that this compound shows a high sensitivity and moderate selectivity toward Zn2+ ion.

Influence of Si-Al-Ge-Sb Matricies on Tm3+ Excitation Levels

2008 ◽  
Vol 587-588 ◽  
pp. 293-297
Author(s):  
M. Pospíšilová ◽  
P. Adámek ◽  
P. Peterka ◽  
V. Kubeček ◽  
I. Kašík ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Fluorescence Spectra ◽  
Chemical Vapor ◽  
Oscillator Strengths ◽  
Absorption And Fluorescence Spectra ◽  
Measured Absorption ◽  
Optical Fiber Drawing ◽  
Solution Doping

Absorption and fluorescence spectra in the range from 350 to 1750 nm of several Tm3+- doped optical performs (rods) for optical fiber drawing were measured. Silica-based matrices of Al2O3-GeO2-P2O5-Sb2O3-SiO2 composition doped with several thousands ppm of Tm3+ were characterized. The preforms were fabricated by the Modified Chemical Vapor Deposition and by the solution doping methods. A new method, Genetic Algorithm SPEctra Decomposition was adopted for processing of the measured absorption spectra. This decomposition made it possible to calculate the oscillator strengths of Tm3+ absorption levels. Fluorescence bands of Tm3+ at 800 nm or 1640 nm were found in fluorescence spectra measured on the preform samples when excited at 1064 nm only.

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