Contrasting photophysical properties of rhenium(i) tricarbonyl complexes having carbazole groups attached to the polypyridine ligand

2016 ◽  
Vol 45 (29) ◽  
pp. 11688-11698 ◽  
Author(s):  
L. D. Ramos ◽  
R. N. Sampaio ◽  
F. F. de Assis ◽  
K. T. de Oliveira ◽  
P. Homem-de-Mello ◽  
...  
Keyword(s):  
Excited State ◽  
Photophysical Properties ◽  
Triplet Excited State

The fac-[Re(CO)3(cbz2phen)(L)]0/+1 complexes showed a remarkable presence of the ILCTcbz2phen fluorescence in addition to the usually observed 3MLCTRe→cbz2phen. In PMMA films the emission is completely turned into a triplet excited state manifold.

Temperature dependence of photophysical properties of a dinuclear C^N-cyclometalated Pt(ii) complex with an intimate Pt–Pt contact. Zero-field splitting and sub-state decay rates of the lowest triplet

2018 ◽  
Vol 20 (38) ◽  
pp. 25096-25104 ◽  
Author(s):  
Joseph C. Deaton ◽  
Arnab Chakraborty ◽  
Rafal Czerwieniec ◽  
Hartmut Yersin ◽  
Felix N. Castellano
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Photophysical Properties ◽  
Decay Rates ◽  
Zero Field ◽  
Triplet Excited State ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Ligand Charge Transfer ◽  
Metal Metal

A dinuclear Pt(ii) complexes exhibits an unusually large zero field splitting in its metal–metal-to-ligand charge transfer triplet excited state.

Synthesis, photophysicochemical studies of adjacently tetrasubstituted binaphthalo-phthalocyanines

2005 ◽  
Vol 09 (05) ◽  
pp. 316-325 ◽  
Author(s):  
Itumeleng Seotsanyana-Mokhosi ◽  
Ji-Yao Chen ◽  
Tebello Nyokong
Keyword(s):  
Excited State ◽  
Quantum Yield ◽  
Triplet State ◽  
Singlet Oxygen ◽  
Photophysical Properties ◽  
Zinc Phthalocyanine ◽  
Quantum Yields ◽  
Triplet Excited State ◽  
General Increase ◽  
Photochemical Behavior

Adjacent binaphthalo-phthalocyanines tetra-substituted with phenoxy (4a), 4-carboxyphenoxy (4b) and 4-t-butylphenoxy (4c) groups, as well as the di-substituted 4-carboxyphenoxy (5b) have been synthesized and characterized. The photophysical and photochemical behavior of 4a-c, were compared with those of the corresponding di-substituted derivatives, (5a-c). The secondary substituents on the phenoxy ring have an influence on the aggregation of the molecules and hence on their photophysical properties. All of the complexes exhibit a relatively good conversion of energy from the triplet-excited state to the singlet oxygen. The less aggregated molecule (4c), has the highest singlet oxygen quantum yield. For all the molecules, fluorescence yields are low and they all have relatively shorter triplet lifetimes compared with the unsubstituted zinc phthalocyanine. Increasing the number of ring substituents on these rigid MPc complexes (from complexes 5 to 4) showed a general increase in the triplet state lifetimes and singlet oxygen quantum yields, and a decrease in stability.

Synthesis and photophysical properties of ruthenium(ii) polyimine complexes decorated with flavin

2018 ◽  
Vol 20 (25) ◽  
pp. 17504-17516 ◽  
Author(s):  
Huimin Guo ◽  
Lijuan Zhu ◽  
Can Dang ◽  
Jianzhang Zhao ◽  
Bernhard Dick
Keyword(s):  
Excited State ◽  
Visible Light ◽  
Light Absorption ◽  
Photophysical Properties ◽  
Triplet Excited State ◽  
Visible Light Absorption ◽  
First Time

Phosphorescent emission from a flavin localized triplet excited state (3IL) is observed for the first time in a flavin decorated tris(dipyridine) Ru(ii) complex with strong visible light absorption.

scholarly journals Ligand-triplet migration in iridium(iii) cyclometalates featuring π-conjugated isocyanide ligands

2020 ◽  
Vol 49 (29) ◽  
pp. 9995-10002
Author(s):  
Joseph M. Favale ◽  
Cory E. Hauke ◽  
Evgeny O. Danilov ◽  
James E. Yarnell ◽  
Felix N. Castellano
Keyword(s):  
Excited State ◽  
Photophysical Properties ◽  
Ancillary Ligand ◽  
Triplet Excited State ◽  
Isocyanide Ligands

The degree of ancillary ligand conjugation determines Ir(iii) polychromophoric photophysical properties via manipulation of the triplet excited state manifolds.

Triplet excited state of diiodoBOPHY derivatives: preparation, study of photophysical properties and application in triplet–triplet annihilation upconversion

2016 ◽  
Vol 4 (8) ◽  
pp. 1623-1632 ◽  
Author(s):  
Caishun Zhang ◽  
Jianzhang Zhao
Keyword(s):  
Excited State ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Photophysical Properties ◽  
Transient Absorption Spectroscopy ◽  
Triplet Excited State ◽  
Triplet Triplet Annihilation

A pyrrole-BF2-based chromophore (BOPHY) was used for the preparation of triplet photosensitizers and the photophysical properties were studied using transient absorption spectroscopy.

scholarly journals Long-lived triplet excited state in a platinum(ii) perylene monoimide complex

2018 ◽  
Vol 47 (42) ◽  
pp. 15071-15081 ◽  
Author(s):  
James E. Yarnell ◽  
Arnab Chakraborty ◽  
Mykhaylo Myahkostupov ◽  
Katherine M. Wright ◽  
Felix N. Castellano
Keyword(s):  
Excited State ◽  
Photophysical Properties ◽  
Triplet Excited State

We report the synthesis and solution based photophysical properties of a new Pt(ii)-terpyridine complex coupled to a perylene monoimide (PMI) chromophoric unit through an acetylene linkage.

scholarly journals Ultra long‐lived triplet excited state in water at room temperature: Insights on the molecular design of tridecafullerenes

2021 ◽  
Author(s):  
Javier Ramos-Soriano ◽  
Alfonso Pérez-Sánchez ◽  
Sergio Ramírez-Barroso ◽  
Beatriz M. Illescas ◽  
Khalid Azmani ◽  
...  
Keyword(s):  
Excited State ◽  
Room Temperature ◽  
Molecular Design ◽  
Triplet Excited State

scholarly journals Triplet energies and excimer formation in meta - and para -linked carbazolebiphenyl matrix materials

2015 ◽  
Vol 373 (2044) ◽  
pp. 20140446 ◽  
Author(s):  
Sergey A. Bagnich ◽  
Alexander Rudnick ◽  
Pamela Schroegel ◽  
Peter Strohriegl ◽  
Anna Köhler
Keyword(s):  
Excited State ◽  
Triplet State ◽  
Spectroscopic Investigation ◽  
Triplet Excited State ◽  
Conjugation Length ◽  
Triplet Energy ◽  
Excimer Formation

We present a spectroscopic investigation on the effect of changing the position where carbazole is attached to biphenyl in carbazolebiphenyl (CBP) on the triplet state energies and the propensity to excimer formation. For this, two CBP derivatives have been prepared with the carbazole moieties attached at the ( para ) 4- and 4 ′ -positions ( p CBP) and at the ( meta ) 3- and 3 ′ -positions ( m CBP) of the biphenyls. These compounds are compared to analogous m CDBP and p CDBP, i.e. two highly twisted carbazoledimethylbiphenyls, which have a high triplet energy at about 3.0 eV and tend to form triplet excimers in a neat film. This torsion in the structure is associated with localization of the excited state onto the carbazole moieties. We find that in m CBP and p CBP, excimer formation is prevented by localization of the triplet excited state onto the central moiety. As conjugation can continue from the central biphenyls into the nitrogen of the carbazole in the para -connected p CBP, emission involves mainly the benzidine. By contrast, the meta -linkage in m CBP limits conjugation to the central biphenyl. The associated shorter conjugation length is the reason for the higher triplet energy of 2.8 eV in m CBP compared with the 2.65 eV in p CBP.

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