Spin-Bahn-Kopplungseffekte in nicht-ebenen Biarylen / Spin-orbit Coupling Effects in Non-planar Biaryls

1977 ◽  
Vol 32 (3-4) ◽  
pp. 339-340 ◽  
Author(s):  
M. Zander
Keyword(s):  
Charge Transfer ◽  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Transition Probability ◽  
Heavy Atom ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Coupling Effects ◽  
Triplet Formation

Abstract The non-planar biaryls 2,2′-dimethyl-biphenyl, 1,1′-bi-naphthyl and 9,9′-biphenanthryl have higher phosphorescence/fluorescence quantum yield ratios than biphenyl, naphthalene and phenanthrene respectively. The increase of spin-orbit coupling in 1,1′-binaphthyl in comparison to naphthalene results in an increase of the phosphorescence transition probability while the triplet formation quantum yield is not enhanced. The much weaker effect of an external heavy atom pertuber on the spin-forbidden electronic tran­ sition rate probabilities in the case of 1,1′-binaphthyl in comparison to naphthalene is explained on the basis of a weaker charge-transfer interaction between luminescer and pertuber in the case of binaphthyl.

Phosphoreszenzeigenschaften von Dibenzo-carbazolen und strukturanalogen Dinaphtho-thiophenen / Phosphorescence Properties of Dibenzo-carbazoles and Structure-related Dinaphtho-thiophenes

1976 ◽  
Vol 31 (6) ◽  
pp. 677-678
Author(s):  
M. Zander
Keyword(s):  
Quantum Yield ◽  
Heavy Atom ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Structure Relation ◽  
Phosphorescence Spectra

Phosphorescence spectra, lifetimes and quantum yield ratios of phosphorescence and fluorescence for carbazole, dibenzo- thiophene, three dibenzo-carbazoles and the corresponding dinaphthothiophenes have been measured in ethanol and in a heavy atom matrix at 77 K. Most of the results can be explained on the basis of spin-orbit coupling and term scheme concepts but an additional phosphorescencechemical structure relation is effective in these compounds

Struktur und Lumineszenz verhalten von Ag+/ π-Donor-Komplexen

1982 ◽  
Vol 37 (12) ◽  
pp. 1348-1352 ◽  
Author(s):  
M. Zander
Keyword(s):  
Charge Transfer ◽  
Photophysical Properties ◽  
Heavy Atom ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Different Types ◽  
Charge Transfer Complexation ◽  
Methyl Naphthalene ◽  
Phosphorescence Spectra

AbstractPhotoluminescence (ethanol, 77 K) of 2-naphthylamine (I), its N,N-dimethyl derivative (II), 1-methyl-naphthalene (III) and 1-naphthyl-9-carbazyl-methane (IV) in the presence of AgNO3 has been studied. The results obtained can be explained assuming different types of Ag+-compIexing with the π-donor: (i) Covalent linkage between Ag and N in the case of I, (ii) Charge-transfer complexation with the aromatic units of II and III , respectively, and (iii) Charge-transfer complexation with the carbazole in IV as the stronger π-donor compared to 1-methyl-naphthalene. Most of the photophysical properties of the systems AgNO3/π-donor can be understood as resulting from heavy atom spin-orbit coupling effects. However, a strong effect of AgNO3 on the structure of the phosphorescence spectra of II and III is shown not to result from heavy atom spin-orbit coupling interaction.

The suppression of spin–orbit coupling effect by the ZnO layer of La0.7Sr0.3MnO3/ZnO heterostructures grown on (001) oriented Si restores the negative magnetoresistance

Nanoscale ◽  
2021 ◽  
Author(s):  
Bibekananda Das ◽  
Prahallad Padhan
Keyword(s):  
Charge Transfer ◽  
Coupling Effect ◽  
Orbit Coupling ◽  
Negative Magnetoresistance ◽  
Magnetic Scattering ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Interfacial Charge Transfer ◽  
Positive Magnetoresistance ◽  
Interfacial Charge

In Si–La0.7Sr0.3MnO3, the interfacial charge transfer driven strong localized antiferromagnetic and spin–orbit couplings favor positive magnetoresistance, which is suppressed by strong magnetic scattering induced by the top ZnO layer results in negative magnetoresistance.

Enhanced blue TADF in D-A-D type naphthyridine derivative with asymmetric carbazole-donor motif

2022 ◽  
Author(s):  
Dovydas Banevičius ◽  
Gediminas Kreiza ◽  
Rokas Klioštoraitis ◽  
Saulius Jursenas ◽  
Tomas Javorskis ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Triplet State ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Locally Excited ◽  
Donor Acceptor ◽  
State Mixing

Efficient triplet-to-singlet conversion in conventional donor-acceptor TADF compounds relies on charge-transfer (CT) and locally-excited (LE) triplet state mixing as this provides required spin-orbit coupling. In this work, asymmetric carbazole-donor motif...

Laser cooling of copper monofluoride: a theoretical study including spin–orbit coupling

RSC Advances ◽  
2016 ◽  
Vol 6 (102) ◽  
pp. 100568-100576 ◽  
Author(s):  
Mingkai Fu ◽  
Jianwei Cao ◽  
Haitao Ma ◽  
Wensheng Bian
Keyword(s):  
Laser Cooling ◽  
Theoretical Study ◽  
Branching Ratios ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Coupling Effects ◽  
Radiative Lifetimes

A laser cooling scheme is proposed for CuF by including the spin–orbit coupling effects, and based on our calculated radiative lifetimes and vibrational branching ratios.

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