scholarly journals New Coumarin Dipicolinate Europium Complexes with a Rich Chemical Speciation and Tunable Luminescence

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1265
Author(s):  
Sebastiano Di Di Pietro ◽  
Dalila Iacopini ◽  
Aldo Moscardini ◽  
Ranieri Bizzarri ◽  
Mauro Pineschi ◽  
...  
Keyword(s):  
Chemical Modification ◽  
Emission Spectroscopy ◽  
Lanthanide Complexes ◽  
Chemical Speciation ◽  
Photophysical Properties ◽  
Molecular Probes ◽  
Paramagnetic Nmr ◽  
Europium Complexes ◽  
Wide Range ◽  
Simple Chemical

Europium (III) luminescent chelates possess intrinsic photophysical properties that are extremely useful in a wide range of applications. The lack of examples of coumarin-based lanthanide complexes is mainly due to poor photo-sensitization attempts. However, with the appeal of using such a versatile scaffold as antenna, especially in the development of responsive molecular probes, it is worth the effort to research new structural motifs. In this work, we present a series of two new tris coumarin-dipicolinate europium (III) complexes, specifically tailored to be either a mono or a dual emitter, tuning their properties with a simple chemical modification. We also encountered a rich chemical speciation in solution, studied in detail by means of paramagnetic NMR and emission spectroscopy.

LUMINESCENCE ENHANCEMENT OF EU(III)-CHELATED COMPLEXES BASED ON NAPHTHALENE DERIVATIVE THROUGH COORDINATION ENVIRONMENT

2004 ◽  
Vol 13 (03n04) ◽  
pp. 627-632 ◽  
Author(s):  
NAM SEOB BAEK ◽  
SOO-GYUN ROH ◽  
YONG HEE KIM ◽  
MIN-KOOK NAH ◽  
HWAN KYU KIM
Keyword(s):  
Lanthanide Complexes ◽  
Photophysical Properties ◽  
Europium Complex ◽  
Photoluminescence Spectra ◽  
Europium Complexes ◽  
Coordination Environment ◽  
Luminescence Enhancement ◽  
Red Emission ◽  
Naphthalene Derivative ◽  
Pl Intensity

We have designed and synthesized novel luminescent lanthanide complexes based on a naphthalene derivative. The coordination number of complexed ligands with Eu 3+ ions is an important parameter to enhance the photoluminescence (PL) intensity. The photoluminescence spectra of Eu ( III )-cored complexes exhibit a sharp red emission band at 612 nm, corresponding to the 5 D 0→7 F 2 transition of the trivalent Eu ion. The saturated europium complexes (C-2 and C-3) have much stronger PL intensity than the unsaturated 6-coordinated europium complex (C-1), due to the instability of the C-1 complex. In this paper, the synthesis and photophysical properties of novel europium(III)-chelated complexes based on a naphthalene derivative will be discussed.

Porphyrin-rylene-diimide-hexabenzocoronene triads

2020 ◽  
Vol 24 (01n03) ◽  
pp. 268-277 ◽  
Author(s):  
Max M. Martin ◽  
Carolin Dusold ◽  
Andreas Hirsch ◽  
Norbert Jux
Keyword(s):  
Emission Spectroscopy ◽  
Photophysical Properties ◽  
Fluorescence Emission ◽  
Visible Spectrum ◽  
Transfer Processes ◽  
Wide Range ◽  
Photophysical Behavior ◽  
Naphthalene Diimides ◽  
First Time ◽  
Absorption Features

Hexa-peri-hexabenzocoronenes (HBCs), substituted by two different chromophores in an ortho arrangement, were synthesized for the first time and investigated towards their photophysical properties. Rylene-diimide dyes, in particular naphthalene-diimides (NDIs) and perylene-diimides (PDIs), were attached to the HBC as the first, and porphyrins as the second chromophore. Therefore, porphyrin-NDI-HPB as well as porphyrin-PDI-HPB precursors were accessed and converted into the respective HBC derivatives applying oxidative Scholl conditions. UV-vis absorption and fluorescence emission spectroscopy showed interesting photophysical behavior such as energy transfer processes. Particularly, the porphyrin-PDI-HBC displays pronounced absorption features between 330–650 nm, which cover a wide range of the visible spectrum.

Synthesis of 1,2,3-Triazole-Fused Indole Derivatives via Copper-Catalyzed Cascade Reaction

Synthesis ◽  
2021 ◽  
Author(s):  
Fengtao Zhou ◽  
Qiuyu Zhang ◽  
Kashif Majeed ◽  
Bangjie Liu
Keyword(s):  
Quantum Efficiency ◽  
Photophysical Properties ◽  
Cascade Reaction ◽  
Tandem Reaction ◽  
Indole Derivatives ◽  
Wide Range

AbstractA copper-catalyzed tandem reaction has been developed for the synthesis of 1,2,3-triazole-fused indole derivatives. This protocol allowed us to access a wide range of 1,2,3-triazole-fused indole derivatives in moderate to excellent yields. The 1,2,3-triazole-fused indole derivatives emit blue and greenish light when excited at 365 nm. The products were further explored for their quantum efficiency and photophysical properties.

Effects of electron-withdrawing groups in imidazole-phenanthroline ligands and their influence on the photophysical properties of EuIII complexes for white light-emitting diodes

2017 ◽  
Vol 41 (18) ◽  
pp. 9826-9839 ◽  
Author(s):  
Boddula Rajamouli ◽  
Rachna Devi ◽  
Abhijeet Mohanty ◽  
Venkata Krishnan ◽  
Sivakumar Vaidyanathan
Keyword(s):  
Thin Film ◽  
Quantum Yield ◽  
White Light ◽  
Light Emitting Diode ◽  
Photophysical Properties ◽  
Red Light ◽  
Europium Complexes ◽  
Light Emitting ◽  
White Light Emitting Diodes ◽  
Phenanthroline Ligands

The red light emitting diode (LED) was fabricated by using europium complexes with InGaN LED (395 nm) and shown digital images, corresponding CIE color coordinates (red region) as well as obtained highest quantum yield of the thin film (78.7%).

Highly‐Luminescent DTTA‐Appended Water‐Soluble Lanthanide Complexes of 4‐(Het)aryl‐2,2′‐bipyridines: Synthesis and Photophysical Properties

2019 ◽  
Vol 4 (20) ◽  
pp. 6377-6381 ◽  
Author(s):  
Alexey P. Krinochkin ◽  
Dmitry S. Kopchuk ◽  
Grigory A. Kim ◽  
Il'ya N. Ganebnykh ◽  
Igor S. Kovalev ◽  
...  
Keyword(s):  
Lanthanide Complexes ◽  
Photophysical Properties ◽  
Water Soluble

Fluorescence correlation spectroscopy: The technique and its applications in soft matter

2018 ◽  
Vol 4 (4) ◽  
Author(s):  
Anjali Gupta ◽  
Jagadish Sankaran ◽  
Thorsten Wohland
Keyword(s):  
Single Molecule ◽  
Fluorescence Correlation Spectroscopy ◽  
Soft Matter ◽  
Photophysical Properties ◽  
Spatiotemporal Analysis ◽  
Correlation Spectroscopy ◽  
Basic Principles ◽  
Chemical Reaction Kinetics ◽  
Fluorescence Correlation ◽  
Wide Range

Abstract Fluorescence correlation spectroscopy (FCS) is a well-established single-molecule method used for the quantitative spatiotemporal analysis of dynamic processes in a wide range of samples. It possesses single-molecule sensitivity but provides ensemble averaged molecular parameters such as mobility, concentration, chemical reaction kinetics, photophysical properties and interaction properties. These parameters have been utilized to characterize a variety of soft matter systems. This review provides an overview of the basic principles of various FCS modalities, their instrumentation, data analysis, and the applications of FCS to soft matter systems.

Synthesis and photophysical properties of europium complexes with heterotopic hexadentate ligands based on 2,2’-bipyridyl-6,6’-dicarboxamide

2017 ◽  
Vol 27 (5) ◽  
pp. 459-461 ◽  
Author(s):  
Anastasiia V. Kharcheva ◽  
Denis A. Evdokimov ◽  
Marina D. Reshetova ◽  
Viktor I. Yuzhakov ◽  
Svetlana V. Patsaeva ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Europium Complexes

Photophysical properties of a series of high luminescent europium complexes with fluorinated ligands

2011 ◽  
Vol 131 (2) ◽  
pp. 328-335 ◽  
Author(s):  
Jiangbo Yu ◽  
Ruiping Deng ◽  
Lining Sun ◽  
Zhefeng Li ◽  
Hongjie Zhang
Keyword(s):  
Photophysical Properties ◽  
Europium Complexes ◽  
Fluorinated Ligands

Tuning the Electrochemical and Photophysical Properties of Osmium-Based Photoredox Catalysts

Synlett ◽  
2022 ◽  
Author(s):  
Eva Bednářová ◽  
Logan R. Beck ◽  
Tomislav Rovis ◽  
Samantha L. Goldschmid ◽  
Katherine Xie ◽  
...  
Keyword(s):  
Ground State ◽  
Emission Spectroscopy ◽  
Near Infrared ◽  
Photophysical Properties ◽  
Low Energy ◽  
Redox Potentials ◽  
Nir Light ◽  
Osmium Complexes ◽  
Absorption And Emission Spectroscopy

AbstractThe use of low-energy deep-red (DR) and near-infrared (NIR) light to excite chromophores enables catalysis to ensue across barriers such as materials and tissues. Herein, we report the detailed photophysical characterization of a library of OsII polypyridyl photosensitizers that absorb low-energy light. By tuning ligand scaffold and electron density, we access a range of synthetically useful excited state energies and redox potentials.1 Introduction1.1 Scope1.2 Measuring Ground-State Redox Potentials1.3 Measuring Photophysical Properties1.4 Synthesis of Osmium Complexes2 Properties of Osmium Complexes2.1 Redox Potentials of Os(L)2-Type Complexes2.2 Redox Potentials of Os(L)3-Type Complexes2.3 UV/Vis Absorption and Emission Spectroscopy3 Conclusions

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