A solid state highly emissive Cu(i) metallacycle: promotion of cuprophilic interactions at the excited states

2016 ◽  
Vol 52 (76) ◽  
pp. 11370-11373 ◽  
Author(s):  
M. El Sayed Moussa ◽  
S. Evariste ◽  
H.-L. Wong ◽  
L. Le Bras ◽  
C. Roiland ◽  
...  
Keyword(s):  
Solid State ◽  
Quantum Yield ◽  
Excited States ◽  
Cuprophilic Interactions

The supramolecular synthesis of an original thermochromic metal-rich Cu(i) metallacycle (quantum yield 72% at RT) is reported. Important geometrical changes reinforcing cuprophilic interactions are calculated at the excited states.

scholarly journals Zn(II) Heteroleptic Halide Complexes with 2-Halopyridines: Features of Halogen Bonding in Solid State

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3393
Author(s):  
Mikhail A. Vershinin ◽  
Marianna I. Rakhmanova ◽  
Alexander S. Novikov ◽  
Maxim N. Sokolov ◽  
Sergey A. Adonin
Keyword(s):  
Solid State ◽  
Quantum Yield ◽  
Crystal Packing ◽  
Halogen Bonding ◽  
Molecular Complexes ◽  
Substituted Pyridines ◽  
Halide Complexes

Reactions between Zn(II) dihalides and 2-halogen-substituted pyridines 2-XPy result in a series of heteroleptic molecular complexes [(2-XPy)2ZnY2] (Y = Cl, X = Cl (1), Br (2), I (3); Y = Br, X = Cl (4), Br (5), I (6), Y = I, X = Cl (7), Br (8), and I (9)). Moreover, 1–7 are isostructural (triclinic), while 8 and 9 are monoclinic. In all cases, halogen bonding plays an important role in formation of crystal packing. Moreover, 1–9 demonstrate luminescence in asolid state; for the best emitting complexes, quantum yield (QY) exceeds 21%.

scholarly journals Modulation of charge transfer by N-alkylation to control photoluminescence energy and quantum yield

2020 ◽  
Vol 11 (27) ◽  
pp. 6990-6995 ◽  
Author(s):  
Andrew T. Turley ◽  
Andrew Danos ◽  
Antonio Prlj ◽  
Andrew P. Monkman ◽  
Basile F. E. Curchod ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Quantum Yield ◽  
Excited States

A versatile N-alkylation strategy controls the presence of charge-transfer excited states and the emission colour of N-heterocyclic chromophores.

A ligand field theory-based methodology for the characterization of the Eu 2+ [Xe]4f 6 5d 1 excited states in solid state compounds

2015 ◽  
Vol 622 ◽  
pp. 120-123 ◽  
Author(s):  
Amador García-Fuente ◽  
Fanica Cimpoesu ◽  
Harry Ramanantoanina ◽  
Benjamin Herden ◽  
Claude Daul ◽  
...  
Keyword(s):  
Field Theory ◽  
Solid State ◽  
Excited States ◽  
Ligand Field ◽  
Ligand Field Theory ◽  
The Eu

scholarly journals Diverse Coordination Numbers and Geometries in Pyridyl Adducts of Lanthanide(III) Complexes Based on β-Diketonate

Inorganics ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 74
Author(s):  
Franz A. Mautner ◽  
Florian Bierbaumer ◽  
Roland C. Fischer ◽  
Ana Torvisco ◽  
Ramon Vicente ◽  
...  
Keyword(s):  
Rare Earth ◽  
Solid State ◽  
Quantum Yield ◽  
Rare Earth Complexes ◽  
Luminescence Spectra ◽  
Excitation Wavelength ◽  
Coordination Numbers ◽  
State Luminescence

Ten mononuclear rare earth complexes of formula [La(btfa)3(H2O)2] (1), [La(btfa)3(4,4′-Mt2bipy)] (2), [La(btfa)3(4,4′-Me2bipy)2] (3), [La(btfa)3(5,5′-Me2bipy)2] (4), [La(btfa)3(terpy)] (5), [La(btfa)3(phen)(EtOH)] (6), [La(btfa)3(4,4′-Me2bipy)(EtOH)] (7), [La(btfa)3(2-benzpy)(MeOH)] (8), [Tb(btfa)3(4,4′-Me2bipy)] (9) and (Hpy)[Eu(btfa)4] (10), where btfa = 4,4,4-trifuoro-1-phenylbutane-1,3-dionato anion, 4,4′-Mt2bipy = 4,4′-dimethoxy-2,2′-bipyridine, 4,4′-Me2bipy = 4,4′-dimethyl-2,2′-bipyridine, 5,5′-Me2bipy = 5,5′-dimethyl-2,2′-bipyridine, terpy = 2,2′:6′,2′-terpyridine, phen = 1,10-phenathroline, 2-benzpy = 2-(2-pyridyl)benzimidazole, Hpy = pyridiniumH+ cation) have been synthesized and structurally characterized. The complexes display coordination numbers (CN) eight for 1, 2, 9, 10, nine for 5, 6, 7, 8 and ten for 3 and 4. The solid-state luminescence spectra of Tb-9 and Eu-10 complexes showed the same characteristic bands predicted from the Tb(III) and Eu(III) ions. The Overall Quantum Yield measured (ϕTOT) at the excitation wavelength of 371 nm for both compounds yielded 1.04% for 9 and up to 34.56% for 10.

The lowest energy excited states of the binuclear silver(I) halide complexes, Ag2(dmb)2X2. Metal-centered or charge transfer states?

1994 ◽  
Vol 72 (3) ◽  
pp. 705-713 ◽  
Author(s):  
Daniel Piché ◽  
Pierre D. Harvey
Keyword(s):  
Charge Transfer ◽  
Solid State ◽  
Excited States ◽  
Silver Halide ◽  
Molecular Orbital Calculations ◽  
Isocyanide Ligands ◽  
Visible Spectra ◽  
Halide Complexes ◽  
The Media ◽  
Uv Visible

The nature of the lowest energy excited states of the Ag2(dmb)2X2 complexes (X = Cl, Br, I; dmb = 1,8-diisocyano-ρ-menthane) have been addressed both experimentally and theoretically. It is shown that the lowest energy excited states of the complexes are charge transfer states from the silver-halide frame to the isocyanide ligands (M/XLCT) based upon UV-visible spectra and emission polarization ratio measurements, and extended Hückel molecular orbital calculations (EHMO). The metal-centered dσ* → pσ bands have been observed in the higher energy region of the spectra (232–242 nm). The complexes are luminescent (440 ≤ λe ≤ 480 nm) both in a glass and in the solid state at 77 K where the emission lifetimes, τe, range from 20 to 90 µs, which depend upon the nature of the halide (for the solid state data) and the media. No emission is observed at room temperature.

Synthesis, photoluminescence and Judd–Ofelt analysis of red LiGd5P2O13 : Eu3+ phosphors for white LEDs

RSC Advances ◽  
2015 ◽  
Vol 5 (67) ◽  
pp. 54622-54628 ◽  
Author(s):  
Xinguo Zhang ◽  
Liya Zhou ◽  
Qi Pang ◽  
Menglian Gong
Keyword(s):  
Thermal Stability ◽  
Solid State ◽  
Quantum Yield ◽  
Solid State Reaction ◽  
Red Light ◽  
Solid State Reaction Method ◽  
Reaction Method ◽  
White Leds ◽  
Good Thermal Stability ◽  
Red Phosphors

LiGd5P2O13 : Eu3+ red phosphors were prepared by solid-state reaction method. Phosphors could be efficiently excited by NUV/blue light and emit pure-red light. LiGd5P2O13 : Eu3+ shows good thermal stability with quantum yield of 46.5%.

Facile preparation of solid-state fluorescent carbon dots with high fluorescence quantum yield and application in rapid latent fingerprints detection

2021 ◽  
Author(s):  
Hai-Jiao Wang ◽  
Wan-Yi Hou ◽  
Jing Kang ◽  
Xin-Yu Zhai ◽  
Hongli Chen ◽  
...  
Keyword(s):  
Solid State ◽  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Latent Fingerprints ◽  
Energy Resonance ◽  
Facile Preparation ◽  
High Fluorescence ◽  
Fluorescent Carbon Dots ◽  
High Fluorescence Quantum Yield ◽  
Resonance Transfer

Due to the direct π - π interaction and excessive energy resonance transfer, it is very challenging to prepare CDs with high fluorescence quantum yield (QY) in solid state. In...

Photoluminescent Cu(i) vs. Ag(i) complexes: slowing down emission in Cu(i) complexes by pentacoordinate low-lying excited states

2019 ◽  
Vol 48 (26) ◽  
pp. 9765-9775 ◽  
Author(s):  
José M. Carbonell-Vilar ◽  
Elisa Fresta ◽  
Donatella Armentano ◽  
Rubén D. Costa ◽  
Marta Viciano-Chumillas ◽  
...  
Keyword(s):  
Solid State ◽  
Excited States ◽  
Photoluminescence Properties ◽  
Slowing Down

Replacement of copper(i) ions by silver(i) improves the solid-state photoluminescence properties.

scholarly journals Optical absorption properties of metal–organic frameworks: solid state versus molecular perspective

2020 ◽  
Vol 22 (35) ◽  
pp. 19512-19521
Author(s):  
Maria Fumanal ◽  
Clémence Corminboeuf ◽  
Berend Smit ◽  
Ivano Tavernelli
Keyword(s):  
Solid State ◽  
Optical Absorption ◽  
Excited States ◽  
Metal Organic Frameworks ◽  
Absorption Properties ◽  
Metal Organic ◽  
Molecular Computations

The challenges of the description of excited states in MOF crystals are addressed by periodic and molecular computations.

‘Excimer’ fluorescence I. Solution spectra of 1:2-benzanthracene derivatives

1963 ◽  
Vol 274 (1359) ◽  
pp. 552-564 ◽  
Keyword(s):  
Quantum Yield ◽  
Crystal Lattice ◽  
Excited States ◽  
Concentration Dependence ◽  
Fluorescence Spectra ◽  
Excimer Fluorescence ◽  
Relative Quantum Yield ◽  
Relative Quantum ◽  
Different Types ◽  
Excimer Formation

Observations have been made of the concentration dependence of the fluorescence spectra of solutions of 1:2-benzanthracene and fifteen of its hydrocarbon derivatives. All of the compounds, except the 9,10-dim ethyl derivative, exhibit dim er emission at higher concentrations. The lower excited states, 1 L b and 1 L a , satisfy Förster’s conditions for fluorescent dim er formation. The factors determining the relative quantum yield of excimer fluorescence are discussed. The different types of crystal fluorescence spectra shown by the compounds are explained in terms of excimer formation in the crystal lattice.

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