Absorption spectra, electrochemical behavior, luminescence spectra, and excited-state lifetimes of mixed-ligand ortho-metalated rhodium(III) complexes

1987 ◽  
Vol 26 (8) ◽  
pp. 1323-1327 ◽  
Author(s):  
Mauro Maestri ◽  
Diana Sandrini ◽  
Vincenzo Balzani ◽  
Urs Maeder ◽  
Alex Von Zelewsky
Keyword(s):  
Excited State ◽  
Absorption Spectra ◽  
Electrochemical Behavior ◽  
Mixed Ligand ◽  
Luminescence Spectra ◽  
Excited State Lifetimes

Protected building blocks for luminescent and redox-active dendritic metal complexes. Excited state properties and electrochemical behaviour

1995 ◽  
Vol 73 (11) ◽  
pp. 1875-1882 ◽  
Author(s):  
Alberto Juris ◽  
Margherita Venturi ◽  
Luca Pontoni ◽  
Immaculada Resino Resino ◽  
Vincenzo Balzani ◽  
...  
Keyword(s):  
Excited State ◽  
Metal Complexes ◽  
Absorption Spectra ◽  
Electrochemical Behavior ◽  
Electrochemical Behaviour ◽  
Building Blocks ◽  
Mononuclear Complexes ◽  
Redox Active ◽  
Polynuclear Metal Complexes ◽  
Fundamental Units

The mononuclear complexes [Ru(2,3-Medpp)3]5+, [Ru(2,3-Medpp)2(bpy)]4+, and [Ru(2,3-Medpp)(bpy)2]3+ and the dinuclear complex [(2,3-Medpp)2Ru(μ-2,3-dpp)Ru(2,3-Medpp)2]8+ (bpy = 2,2′-bipyridine; 2,3-dpp = 2,3-bis(2-pyridyl)pyrazine; 2,3-Medpp+ = monomethylated 2,3-bis(2-pyridyl)pyrazine) have been synthesized. Their absorption spectra, luminescence properties, and electrochemical behavior have been investigated and compared with those of the mononuclear [Ru(bpy)3]2+, [Ru(2,3-dpp)3]2+, [Ru(2,3-dpp)2(bpy)]2+, and [Ru(2,3-dpp)(bpy)2]2+ and the dinuclear [(bpy)2Ru(μ-2,3-dpp)Ru(bpy)2]4+ parent compounds. The complexes examined are fundamental units in the synthesis of polynuclear metal complexes of dendrimeric structure and nanometer size. Keywords: luminescence, ruthenium complexes, dendrimers, electrochemistry, photochemistry.

NIR and Upconversion Luminescence Properties of Nd3+ Doped in Gd2O3-CaO-SiO2-B2O3 Glass System

2014 ◽  
Vol 548-549 ◽  
pp. 124-128 ◽  
Author(s):  
S. Insiripong ◽  
S. Kaewjeang ◽  
U. Maghanemi ◽  
H.J. Kim ◽  
N. Chanthima ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Optical Absorption ◽  
Absorption Spectra ◽  
Upconversion Luminescence ◽  
Emission Spectra ◽  
Concentration Quenching ◽  
Luminescence Spectra ◽  
Optical Absorption Spectra ◽  
Glass Matrices ◽  
Nir Luminescence

In this work, properties of Nd3+ in Gd2O3-CaO-SiO2-B2O3 glass systems with composition 25Gd2O3-10CaO-10SiO2-(55-x)B2O3-xNd2O3 where x = 0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 mol% were investigated. The optical absorption spectra show peaks at 4F3/2 (877 nm) , 4F5/2+2H9/2 (802 nm), 4F7/2+4S3/2 (743 nm), 4F9/2 (682 nm), 2H11/2 (627 nm), 2G7/2 +4G5/2 (582 nm), 4G7/2 +2K13/2 (527 nm), 4G11/2 (481 nm), 2P1/2 (427 nm) and 2L15/2 + 4D1/2 + 1I11/2+ 4D5/2+ 4D3/2 (355 nm) reflecting the Nd3+ ions in glass matrices. The densities were increased with increasing of Nd2O3 concentration. This indicates the increase of the molecular weight by the replacement of B2O3 with a heavier Nd2O3 oxide in the glass. The upconversion luminescence spectra show bands at 393 nm for all Nd2O3 concentration and the strongest intensity from 2.5 % mol of Nd2O3 was obtained. For NIR luminescence, the intensity of Nd3+ emission spectra increases with increasing concentrations of Nd3+ up to 1.5 mol% and beyond 1.5 mol% the concentration quenching is observed.

Ultrafast Spectroscopy of Arylchlorodiazirines: Hammett Correlations of Excited State Lifetimes

2009 ◽  
Vol 131 (46) ◽  
pp. 16652-16653 ◽  
Author(s):  
Yunlong Zhang ◽  
Lei Wang ◽  
Robert A. Moss ◽  
Matthew S. Platz
Keyword(s):  
Excited State ◽  
Ultrafast Spectroscopy ◽  
Excited State Lifetimes

Steric Effects in the Electronic Spectra of the 3,5-Diarylaminobenzene Derivatives

1986 ◽  
Vol 41 (11) ◽  
pp. 1311-1314 ◽  
Author(s):  
A. Balter ◽  
W. Nowak ◽  
P. Milart ◽  
J. Sepioł
Keyword(s):  
Excited State ◽  
Electronic Spectra ◽  
Fluorescence Properties ◽  
Steric Effects ◽  
Quantum Yields ◽  
Spectroscopic Behaviour ◽  
Fluorescence Quantum Yields ◽  
Excited State Lifetimes ◽  
Methyl Phenyl

Absorption and fluorescence properties, excited state lifetimes and fluorescence quantum yields were determined for a series of 3,5-diarylaminobenzene derivatives in solvents of different polarities. The role of the nitrile, methyl, phenyl and naphthyl substituents is discussed. Especially the steric effects on the spectroscopic behaviour of the investigated molecules are studied.

scholarly journals Mono- Versus Bicyclic Carbene Metal Amide Photoemitters: Which Design Leads to Best Performance?

2020 ◽  
Author(s):  
Florian Chotard ◽  
Vasily Sivchik ◽  
Mikko Linnolahti ◽  
Manfred Bochmann ◽  
Alexander Romanov
Keyword(s):  
Excited State ◽  
State Energy ◽  
Conformational Flexibility ◽  
Quantum Yields ◽  
Carbene Ligands ◽  
Lumo Energy ◽  
Excited State Energy ◽  
Excited State Lifetimes

New luminescent “carbene-metal-amide” (CMA) Cu, Ag and Au complexes based on monocyclic (C6) or bicyclic six-ring (BIC6) cyclic (alkyl)(amino)carbene ligands illustrates the effects of LUMO energy stabilization, conformational flexibility and excited state energy on the photoemission properties, leading to near-quantitative quantum yields, short excited state lifetimes Cu > Au > Ag down to 0.5 µs and high radiative rates of 10<sup>6</sup> s<sup>–1</sup>.

Excited state absorption spectra and intersystem crossing kinetics in the naphthaldehydes

1984 ◽  
Vol 80 (7) ◽  
pp. 3179-3184 ◽  
Author(s):  
David W. Boldridge ◽  
Brian L. Justus ◽  
Gary W. Scott
Keyword(s):  
Excited State ◽  
Absorption Spectra ◽  
Excited State Absorption ◽  
Intersystem Crossing
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