(1,5-Cyclooctadiene)bis(3,6-di-tert-butylcatecholato)iridium(IV). An organometallic aryl oxide complex with a charge-transfer transition at unusually low energy

1992 ◽  
Vol 114 (16) ◽  
pp. 6582-6583 ◽  
Author(s):  
Christopher W. Lange ◽  
Cortlandt G. Pierpont
Keyword(s):  
Charge Transfer ◽  
Low Energy ◽  
Charge Transfer Transition ◽  
A Charge

scholarly journals NIR-to-visible upconversion in quantum dots via a ligand induced charge transfer state

RSC Advances ◽  
2019 ◽  
Vol 9 (21) ◽  
pp. 12153-12161 ◽  
Author(s):  
Noga Meir ◽  
Iddo Pinkas ◽  
Dan Oron
Keyword(s):  
Quantum Dots ◽  
Charge Transfer ◽  
Charge Transfer State ◽  
Charge Transfer Transition ◽  
System P ◽  
Induced Charge ◽  
A Charge ◽  
Transfer State

Photon upconversion is facilitated by the generation of a charge transfer transition in the interface of a coupled QD–thiol system.

Synthesis and Photophysical Properties of Conjugated Quinolines

2009 ◽  
Vol 2009 (7) ◽  
pp. 427-429 ◽  
Author(s):  
Youfeng Yue ◽  
Mingxin Yu ◽  
Longguan Zhu
Keyword(s):  
Charge Transfer ◽  
Photophysical Properties ◽  
Aryl Halides ◽  
Charge Transfer Transition ◽  
Light Emitting ◽  
H Nmr ◽  
Organic Light ◽  
Elemental Analyses ◽  
Ft Ir ◽  
A Charge

Aryl halides were prepared by condensation of 2-methylquinoline and bromo- or chloro-arylaldehydes in acetic anhydride. Diarylamines reacted with the aryl halides to afford novel triarylamine derivatives using Pd(OAc)2/P ( o-tolyl)3 as catalyst. These compounds have potential as organic light-emitting device materials and were characterised by FT-IR, 1H NMR and elemental analyses. The UV-vis absorption and photoluminescent spectra of the compounds in CH2CI2 were investigated. The lowest absorption band of the triarylamine derivatives centred at about 400 nm was assigned to a charge-transfer transition with an emission at 500–515 nm.

Proton and electron transfers in O•H•O and C•H•O hydrogen-bridged ions: their role in the dissociation chemistry of ionized acetol, CH3C(=O)CH2OH•+

1996 ◽  
Vol 74 (6) ◽  
pp. 1078-1087 ◽  
Author(s):  
Paul J.A. Ruttink ◽  
Peter C. Burgers ◽  
Johan K. Terlouw
Keyword(s):  
Charge Transfer ◽  
Ab Initio ◽  
Hydrogen Transfer ◽  
Valence Bond ◽  
Radical Cations ◽  
Low Energy ◽  
Ion Molecule Reactions ◽  
Proton Transfers ◽  
Dissociation Chemistry ◽  
A Charge

Low-energy acetol ions CH3C(=O)CH2OH•+, 1, dissociate to CH3C(H)OH+ and HC=O• by a double hydrogen transfer (DHT), a common reaction among oxygen-containing radical cations. Recent experimental work has shown that the isotopologue CH3C(=O)CH2OD•+ specifically loses HC=O• to produce CH3C(D)OH+. This finding refutes an earlier postulated attractive mechanism based on the behaviour of 1 in ion-molecule reactions. Using ab initio MO calculations (at the CEPA//RHF/DZP level of theory complemented with valence bond (VB) methods), a low-energy pathway was traced that may explain all of the available experimental observations. It is shown that the unimolecular chemistry of 1 can be understood in terms of two proton transfers, taking place in intermediate O•H•O and C•H•O bonded hydrogen-bridged radical cations. The two protons originate from the same moiety and a charge transfer complex is therefore implicated and shown to be involved. These concepts of proton and charge transfer may well be more generally applicable and they do correctly predict the unimolecular chemistry of ionized acetoin, CH3C(=O)CH(CH3)OH•+ and related α-ketols. Key words: ab initio calculations, hydrogen-bridged ions.

scholarly journals The Origin of the Low-Energy Form of Photosystem I Light-Harvesting Complex Lhca4: Mixing of the Lowest Exciton with a Charge-Transfer State

2009 ◽  
Vol 96 (5) ◽  
pp. L35-L37 ◽  
Author(s):  
Elisabet Romero ◽  
Milena Mozzo ◽  
Ivo H.M. van Stokkum ◽  
Jan P. Dekker ◽  
Rienk van Grondelle ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Photosystem I ◽  
Light Harvesting ◽  
Low Energy ◽  
Charge Transfer State ◽  
Light Harvesting Complex ◽  
A Charge ◽  
Transfer State

The photolysis of hexaaquoiron(III) perchlorate in the presence of ethylene glycol

1977 ◽  
Vol 55 (4) ◽  
pp. 625-629 ◽  
Author(s):  
John H. Carey ◽  
Ernest G. Cosgrove ◽  
Barry G. Oliver
Keyword(s):  
Charge Transfer ◽  
Ethylene Glycol ◽  
Transfer Reaction ◽  
Outer Sphere ◽  
Reaction Scheme ◽  
Major Product ◽  
Quantum Yields ◽  
Charge Transfer Reaction ◽  
Charge Transfer Transition ◽  
A Charge

Two types of reactions occur when hexaaquoiron(III) ion is irradiated at 254 nm in the presence of alcohols. Firstly, a charge transfer transition from a water centred orbital to an iron centred orbital produces OH•radicals which go on to abstract hydrogen from the alcohols. Secondly, |the reaction with the charge transfer excited states of iron(III) species can lead to outer sphere oxidation of the alcohols. In this paper, these reactions have been studied in detail for the diol ethylene glycol in aqueous solutions. It has been found that the quantum yield of acetaldehyde, the major product of hydroxyl radical reactions with ethylene glycol, is 0.09 and the yield of formaldehyde, the major product of the direct charge transfer reaction, is 0.05 in 1 M ethylene glycol. The quantum yields for these major products, as well as minor products, such as glycolaldehyde and succinaldehyde, have been determined at several concentrations of ethylene glycol and iron. A detailed reaction scheme for the photolysis has been developed.

A Charge Transfer Transition in the Near U.V. Spectrum of 1,3-benzodioxole Derivatives

1991 ◽  
Vol 24 (3) ◽  
pp. 397-412 ◽  
Author(s):  
Bernard Vidal ◽  
Josie Vardin ◽  
Annick Darry-Henaut
Keyword(s):  
Charge Transfer ◽  
Charge Transfer Transition ◽  
A Charge

Determination of Epsilon Aminocaproic Acid Based on Charge Transfer Complexation with p-Nitrophenlol by Spectrophotometry

2020 ◽  
Vol 16 ◽  
Author(s):  
Sheng-Yun Li ◽  
Fang Tian
Keyword(s):  
Charge Transfer ◽  
Aminocaproic Acid ◽  
Concentration Limit ◽  
Official Method ◽  
Good Precision ◽  
Pharmaceutical Dosage Forms ◽  
Relative Standard ◽  
A Charge ◽  
Epsilon Aminocaproic Acid

: A spectrophotometry was investigated for the determination of epsilon aminocaproic acid (EACA) with p-nitrophenol (PNP). The method was based on a charge transfer (CT) complexation of this drug as n-electron donor with π-acceptor PNP. Experiment indicated that the CT complexation was carried out at room temperature for 10 minutes in dimethyl sulfoxide solvent. The spectrum obtained for EACA/PNP system showed the maximum absorption band at wavelength of 425 nm. The stoichiometry of the CT complex was found to be 1:1 ratio by Job’s method between the donor and the acceptor. Different variables affecting the complexation were carefully studied and optimized. At the optimum reaction conditions, Beer’s law was obeyed in a concentration limit of 1～6 µg mL-1. The relative standard deviation was less than 2.9%. The apparent molar absoptivity was determined to be 1.86×104 L mol-1cm-1 at 425 nm. The CT complexation was also confirmed by both FTIR and 1H NMR measurements. The thermodynamic properties and reaction mechanism of the CT complexation have been discussed. The developed method could be applied successfully for the determination of the studied compound in its pharmaceutical dosage forms with a good precision and accuracy compared to official method as revealed by t- and F-tests.

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