Structure and Photophysical Properties of Porphyrin-Modified Metal Nanoclusters with Different Chain Lengths

Langmuir ◽  
2004 ◽  
Vol 20 (1) ◽  
pp. 73-81 ◽  
Author(s):  
Hiroshi Imahori ◽  
Yukiyasu Kashiwagi ◽  
Yoshiyuki Endo ◽  
Takeshi Hanada ◽  
Yoshinobu Nishimura ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Metal Nanoclusters ◽  
Chain Lengths

Metal and size effects on structures and photophysical properties of porphyrin-modified metal nanoclusters

2003 ◽  
Vol 13 (12) ◽  
pp. 2890 ◽  
Author(s):  
Hiroshi Imahori ◽  
Yukiyasu Kashiwagi ◽  
Takeshi Hanada ◽  
Yoshiyuki Endo ◽  
Yoshinobu Nishimura ◽  
...  
Keyword(s):  
Size Effects ◽  
Photophysical Properties ◽  
Metal Nanoclusters

scholarly journals Fluorene-Based Donor-Acceptor Copolymers Containing Functionalized Benzotriazole Units: Tunable Emission and their Electrical Properties

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 256 ◽  
Author(s):  
Iván Torres-Moya ◽  
Rebeca Vázquez-Guilló ◽  
Sara Fernández-Palacios ◽  
José Ramón Carrillo ◽  
Ángel Díaz-Ortiz ◽  
...  
Keyword(s):  
Density Functional ◽  
Field Effect Transistors ◽  
Photophysical Properties ◽  
Suzuki Reaction ◽  
Organic Field Effect Transistors ◽  
Functional Theory ◽  
Organic Optoelectronics ◽  
Donor Acceptor ◽  
Chain Lengths ◽  
Tunable Emission

Monomers 4,7-dibromo-2H-benzo[d]1,2,3-triazole (m1) and 4,7-(bis(4-bromophenyl)ethynyl)-2H-benzo[d]1,2,3-triazole (m2) have been synthesized in good yields using different procedures. Monomers m1 and m2 have been employed for building new copolymers of fluorene derivatives by a Suzuki reaction under microwave irradiation using the same conditions. In each case different chain lengths have been achieved, while m1 gives rise to polymers for m2 oligomers have been obtained (with a number of monomer units lower than 7). Special interest has been paid to their photophysical properties due to excited state properties of these D-A units alternates, which have been investigated by density functional theory (DFT) calculations using two methods: (i) An oligomer approach and (ii) by periodic boundary conditions (PBC). It is highly remarkable the tunability of the photophysical properties as a function of the different monomer functionalization derived from 2H-benzo[d]1,2,3-triazole units. In fact, a strong modulation of the absorption and emission properties have been found by functionalizing the nitrogen N-2 of the benzotriazole units or by elongation of the π-conjugated core with the introduction of alkynylphenyl groups. Furthermore, the charge transport properties of these newly synthesized macromolecules have been approached by their implementation in organic field-effect transistors (OFETs) in order to assess their potential as active materials in organic optoelectronics.

scholarly journals Fluorescent Liquid Tetrazines

Molecules ◽  
2021 ◽  
Vol 26 (19) ◽  
pp. 6047
Author(s):  
Maximilian Paradiz Paradiz Dominguez ◽  
Begüm Demirkurt ◽  
Marion Grzelka ◽  
Daniel Bonn ◽  
Laurent Galmiche ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Liquid Films ◽  
Quantum Yields ◽  
Intersystem Crossing ◽  
Time Resolved ◽  
Fluorescence Quantum Yields ◽  
Exciton Migration ◽  
Orange Fluorescence ◽  
The Difference ◽  
Chain Lengths

Tetrazines with branched alkoxy substituents are liquids at ambient temperature that despite the high chromophore density retain the bright orange fluorescence that is characteristic of this exceptional fluorophore. Here, we study the photophysical properties of a series of alkoxy-tetrazines in solution and as neat liquids. We also correlate the size of the alkoxy substituents with the viscosity of the liquids. We show using time-resolved spectroscopy that intersystem crossing is an important decay pathway competing with fluorescence, and that its rate is higher for 3,6-dialkoxy derivatives than for 3-chloro-6-alkoxytetrazines, explaining the higher fluorescence quantum yields for the latter. Quantum chemical calculations suggest that the difference in rate is due to the activation energy required to distort the tetrazine core such that the nπ*S1 and the higher-lying ππ*T2 states cross, at which point the spin-orbit coupling exceeding 10 cm−1 allows for efficient intersystem crossing to occur. Femtosecond time-resolved anisotropy studies in solution allow us to measure a positive relationship between the alkoxy chain lengths and their rotational correlation times, and studies in the neat liquids show a fast decay of the anisotropy consistent with fast exciton migration in the neat liquid films.

Synthesis and photophysical properties of soluble low-bandgap thienothiophene polymers with various alkyl side-chain lengths

2011 ◽  
Vol 49 (15) ◽  
pp. 3260-3271 ◽  
Author(s):  
Woo Jin Bae ◽  
Christopher Scilla ◽  
Volodimyr V. Duzhko ◽  
Won Ho Jo ◽  
E. Bryan Coughlin
Keyword(s):  
Photophysical Properties ◽  
Side Chain ◽  
Alkyl Side Chain ◽  
Low Bandgap ◽  
Chain Lengths

scholarly journals Controlling Molecular Aggregation-Induced Emission by Controlled Polymerization

Molecules ◽  
2021 ◽  
Vol 26 (20) ◽  
pp. 6267
Author(s):  
Yinyin Bao
Keyword(s):  
Small Molecules ◽  
Photophysical Properties ◽  
Systematic Investigation ◽  
Future Research ◽  
Structure Property ◽  
Controlled Polymerization ◽  
Polymeric Systems ◽  
Structure Property Relationships ◽  
Macromolecular Systems ◽  
Chain Lengths

In last twenty years, the significant development of AIE materials has been witnessed. A number of small molecules, polymers and composites with AIE activity have been synthesized, with some of these exhibiting great potential in optoelectronics and biomedical applications. Compared to AIE small molecules, macromolecular systems—especially well-defined AIE polymers—have been studied relatively less. Controlled polymerization methods provide the efficient synthesis of well-defined AIE polymers with varied monomers, tunable chain lengths and narrow dispersity. In particular, the preparation of single-fluorophore polymers through AIE molecule-initiated polymerization enables the systematic investigation of the structure–property relationships of AIE polymeric systems. Here, the main polymerization techniques involved in these polymers are summarized and the key parameters that affect their photophysical properties are analyzed. The author endeavored to collect meaningful information from the descriptions of AIE polymer systems in the literature, to find connections by comparing different representative examples, and hopes eventually to provide a set of general guidelines for AIE polymer design, along with personal perspectives on the direction of future research.

scholarly journals Zeolites as Scaffolds for Metal Nanoclusters

2021 ◽  
Author(s):  
Eduard Fron
Keyword(s):  
Reaction Mechanisms ◽  
Metal Clusters ◽  
Photophysical Properties ◽  
Research Articles ◽  
Photostimulated Luminescence ◽  
Metal Nanoclusters ◽  
Computational Approaches ◽  
Excellent Research ◽  
Emitting Species ◽  
Insight Into

This chapter critically reviews the studies related to structural and photophysical properties of metal clusters within zeolites matrices and summarizes the progress made in understanding the host-guest interactions. The goal is to provide useful insight into the nature of such interactions and experiments used in identifying the excited state dynamics and the reaction mechanisms leading to the emitting species. Especially interesting are the combined experimental and computational approaches used to elucidate the structures and electronic transition of clusters inside the cavity. Although a number of excellent research articles have been published in the last years they only cover rather specific areas like organic photochemistry, confinement, charge transfer, theoretical modeling or photostimulated luminescence.

scholarly journals Gold Nanoclusters: Bridging Gold Complexes and Plasmonic Nanoparticles in Photophysical Properties

Nanomaterials ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 933 ◽  
Author(s):  
Meng Zhou ◽  
Chenjie Zeng ◽  
Qi Li ◽  
Tatsuya Higaki ◽  
Rongchao Jin
Keyword(s):  
Excited State ◽  
Photophysical Properties ◽  
Gold Nanoclusters ◽  
Detailed Comparison ◽  
Organometallic Complexes ◽  
Plasmonic Nanoparticles ◽  
Metal Nanoclusters ◽  
Metal Core ◽  
Gold Complexes ◽  
Metal Metal

Recent advances in the determination of crystal structures and studies of optical properties of gold nanoclusters in the size range from tens to hundreds of gold atoms have started to reveal the grand evolution from gold complexes to nanoclusters and further to plasmonic nanoparticles. However, a detailed comparison of their photophysical properties is still lacking. Here, we compared the excited state behaviors of gold complexes, nanolcusters, and plasmonic nanoparticles, as well as small organic molecules by choosing four typical examples including the Au10 complex, Au25 nanocluster (1 nm metal core), 13 diameter Au nanoparticles, and Rhodamine B. To compare their photophysical behaviors, we performed steady-state absorption, photoluminescence, and femtosecond transient absorption spectroscopic measurements. It was found that gold nanoclusters behave somewhat like small molecules, showing both rapid internal conversion (<1 ps) and long-lived excited state lifetime (about 100 ns). Unlike the nanocluster form in which metal–metal transitions dominate, gold complexes showed significant charge transfer between metal atoms and surface ligands. Plasmonic gold nanoparticles, on the other hand, had electrons being heated and cooled (~100 ps time scale) after photo-excitation, and the relaxation was dominated by electron–electron scattering, electron–phonon coupling, and energy dissipation. In both nanoclusters and plasmonic nanoparticles, one can observe coherent oscillations of the metal core, but with different fundamental origins. Overall, this work provides some benchmarking features for organic dye molecules, organometallic complexes, metal nanoclusters, and plasmonic nanoparticles.

An overview on the current understanding of the photophysical properties of metal nanoclusters and their potential applications

Nanoscale ◽  
2019 ◽  
Vol 11 (47) ◽  
pp. 22685-22723 ◽  
Author(s):  
Subarna Maity ◽  
Dipankar Bain ◽  
Amitava Patra
Keyword(s):  
Photophysical Properties ◽  
Current Understanding ◽  
Metal Nanoclusters ◽  
Potential Applications ◽  
Bio Imaging

Photophysics of atomically precise metal nanoclusters (MNCs) is an emerging area of research due to their potential applications in optoelectronics, photovoltaics, sensing, bio-imaging and catalysis.

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