Fluorescence Studies of Energy Transfer between Single and PairCr3+Systems inAl2O3

1967 ◽  
Vol 155 (2) ◽  
pp. 296-308 ◽  
Author(s):  
Richard C. Powell ◽  
B. DiBartolo ◽  
B. Birang ◽  
C. S. Naiman
Keyword(s):  
Energy Transfer ◽  
Fluorescence Studies

Energy transfer in and fluorescence studies of the Eu-Tb doped BPA-phen system

2019 ◽  
Vol 66 (8) ◽  
pp. 879-885 ◽  
Author(s):  
Guangbo Xie ◽  
Haibang Zhang ◽  
Zijun Zhang ◽  
Juntong Liu ◽  
Jingjing Zhang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Fluorescence Studies ◽  
The Eu

Energy Transfer in Organic Dendrimer Antenna Funnel and Anti-Funnel Supermolecules

1998 ◽  
Vol 543 ◽  
Author(s):  
Stephen F. Swallen ◽  
Raoul Kopelman ◽  
Jeffrey S. Moore
Keyword(s):  
Molecular Structure ◽  
Energy Transfer ◽  
Steady State ◽  
Intermolecular Interactions ◽  
Molecular Geometry ◽  
Intramolecular Energy Transfer ◽  
Fluorescence Studies ◽  
Energy Trapping ◽  
Exciton Localization ◽  
Steady State Fluorescence

AbstractThe photophysics of exciton localization and energy transfer are examined in two unique classes of phenylacetylene dendrimers. One set of supermolecules is observed to efficiently and rapidly funnel absorbed radiation toward the molecular locus, while a slight change in molecular structure creates an effective “anti-funnel”, greatly reducing the efficiency of energy trapping. Lifetime-based and steady state fluorescence studies are used to determine the rates of intramolecular energy transfer and to glean information on molecular geometry and intermolecular interactions in two solvents.

Excited State Dynamics of Novel Diporphyrins with Dissimilar Cores

1999 ◽  
Vol 03 (01) ◽  
pp. 70-77 ◽  
Author(s):  
M. RAVIKUMAR ◽  
R. P. PANDIAN ◽  
T. K. CHANDRASHEKAR
Keyword(s):  
Energy Transfer ◽  
Excited State ◽  
Excitation Wavelength ◽  
Triplet Excited State ◽  
Lifetime Measurements ◽  
Time Resolved ◽  
Fluorescence Studies ◽  
Axial Ligation ◽  
Excitation Time ◽  
The Individual

The singlet and triplet excited state properties of two diporphyrins, H 2- H and Zn - H , are described. Steady state fluorescence studies indicate that the emission of the H 2- H diporphyrin is dependent on the excitation wavelength and is dominated by the emission of the individual constituent monomers at their respective excitation. Time-resolved studies show two lifetimes ascribable to the normal and thiaporphyrin subunits. However, the emission of the Zn - H diporphyrin is dominated by the thiaporphyrin subunit irrespective of the wavelength of excitation, suggesting an energy transfer from the Zn porphyrin subunit to the thiaporphyrin subunit. Lifetime measurements in toluene show two lifetimes due to open and folded conformations, while in DMF an additional component due to axial ligation is observed. The efficiency of energy transfer is moderately higher in DMF (72%) than in toluene (68%). Triplet ESR studies on the H 2- H dimer reveal a localized triplet with ZFS parameters and ESP pattern the same as for the individual monomers. On the other hand, triplet ESR of the Zn - H diporphyrin reveals triplet characteristics of the thiaporphyrin subunit, indicating an energy transfer in the triplet state.

scholarly journals Fluorescence Studies of the Interplay between Metal-Enhanced Fluorescence and Graphene-Induced Quenching

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1916
Author(s):  
Kamil Wiwatowski ◽  
Paweł Podlas ◽  
Magdalena Twardowska ◽  
Sebastian Maćkowski
Keyword(s):  
Energy Transfer ◽  
Metallic Nanostructures ◽  
Monolayer Graphene ◽  
Hybrid Nanostructure ◽  
Enhanced Fluorescence ◽  
Metal Enhanced Fluorescence ◽  
Efficient Energy Transfer ◽  
Fluorescence Studies ◽  
Efficient Energy ◽  
Silver Islands

Fluorescence microscopy and spectroscopy were applied for studying the optical properties of a hybrid nanostructure, in which we combine plasmon-induced metal enhanced fluorescence with energy transfer to epitaxial graphene. Covering the layer of silver islands with a monolayer graphene, while turning on the efficient energy transfer from emitters, only moderately affects the enhancement of fluorescence attributed to the plasmon resonance in metallic nanostructures—as evidenced by the analysis of fluorescence decays. The results show that it is feasible to combine the properties of graphene with metal-enhanced fluorescence. The importance of the layer thickness of the emitters is also pointed out.

Energy Transfer in a Supramolecular Complex Assembled via Sapphyrin Dimer-mediated Dicarboxylate Anion Chelation

1998 ◽  
Vol 02 (04) ◽  
pp. 315-325 ◽  
Author(s):  
STACY L. SPRINGS ◽  
ANDREI ANDRIEVSKY ◽  
VLADINÍR KRÁL ◽  
JONATHAN L. SESSLER
Keyword(s):  
Energy Transfer ◽  
Fluoride Anion ◽  
Free Base ◽  
Light Harvesting Complex ◽  
Fluorescence Studies ◽  
H Nmr ◽  
Steady State Fluorescence ◽  
Spectroscopic Analyses ◽  
Affinity Constants ◽  
Covalently Linked

The synthesis of a new terephthalate-strapped porphyrin is described. This porphyrin, prepared in the form of the free base and corresponding zinc(II) complex, was designed to act as the photo-donor portion of a novel, non-covalent artificial light-harvesting complex, the other, acceptor component of which is comprised of a covalently linked sapphyrin dimer. UV-vis and 1 H NMR spectroscopic analyses were used to establish that strong complexes are formed between the porphyrin terephthalate and sapphyrin dimer components (affinity constants on the order of 105 M−1 in dichloromethane). In these complexes the dicarboxylate portion of the strapped porphyrin is sandwiched between two sapphyrins of an individual dimer. Steady state fluorescence studies of the resulting ensembles support the conclusion that, upon photoexcitation of the porphyrin subunit, energy transfer from the porphyrin to the sapphyrin dimer occurs efficiently. This intra-ensemble, anion-chelation-based energy transfer can be inhibited by the addition of fluoride anion.

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