Elektronenspektren der Fluoro-Chloro-Osmate(V), [OsFnCl6–n]–, n = 0 — 6

1986 ◽  
Vol 41 (10) ◽  
pp. 1222-1227 ◽  
Author(s):  
Th. Groth ◽  
W. Preetz
Keyword(s):  
Fine Structure ◽  
Charge Transfer ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Absorption Bands ◽  
Charge Transfer Transitions ◽  
Temperature Spectra ◽  
Tetraethylammonium Salts

The electronic absorption spectra of the solid tetraethylammonium salts of [OsFnCl6-n]- are measured at 10 K. The strong bands in the UV/YIS region are assigned to charge transfer transitions from π(t1 u, t2 u) and σ(t1 u ) Cl orbitals into the π(t2g3) Os(V) level. The weak intraconfigurational excitations within the t2g3 manifold of Os(V) are split by spin-orbit coupling and lowered symmetry into Kramers doublets, observed in the range 5500-18000 cm-1. The 0 - 0-transitions are deduced from vibrational fine structure; for the centrosymmetric complexes they are confirmed by hot bands recorded in the normal temperature spectra. There is a systematical shift of all absorption bands to higher energy with increasing number of F-ligands.

Elektronenspektren der Fluoro-Chloro-Osmate(IV), [OsFnCl6–n]2-,n = 0– 6

1986 ◽  
Vol 41 (6) ◽  
pp. 871-878
Author(s):  
W. Preetz ◽  
D. Ruf
Keyword(s):  
Fine Structure ◽  
Electronic Absorption Spectra ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Tetraalkylammonium Salts ◽  
Absorption Bands ◽  
Charge Transfer Transitions ◽  
Temperature Spectra ◽  
Point Groups ◽  
And Shifts

The electronic absorption spectra of the solid tetraalkylammonium salts of [OsFnCl6-n]2-, n = 0 -6 , including the stereoisomers for n = 2, 3, 4, are measured at 10 K. The strong bands in the UV/VIS region are assigned to charge-transfer transitions from π(t1 u, t2 u) and σ (t1 u) Cl orbitals into the π (t2g4) Os(IV) level. The observed splittings and shifts are interpreted by qualitative MO treatment according to point groups D 4h, C4v, C 3v and C 2v of the mixed complexes. The weak intraconfigurational transitions within the t2g4 configuration of Os(IV) are splitted by spin orbit coupling and lowered symmetry into multiplets with up to five states, observed in the NIR regions 4700-7300, 10 700-13 200 and 17 000-21 600 cm -1. The O -O - transitions are deduced from vibrational fine structure; in some cases they are confirmed by electronic Raman bands with the same frequencies and by hot bands observed in the normal temperature spectra. Within the series of complexes all absorption bands are shifted systematically to higher energies with increasing number of F-ligands.

Absorptions- and Electronic Raman Spectra of Chloro- Bromo-Osmate (IV), [OsClnBr6-nJ 2-, n=0-6

1991 ◽  
Vol 46 (9) ◽  
pp. 803-808 ◽  
Author(s):  
K. Irmer ◽  
W. Preetz
Keyword(s):  
Fine Structure ◽  
Absorption Spectra ◽  
Raman Spectra ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit

Abstract The electronic absorption spectra of the solid tetrabutylammonium salts of [OsClnBr6-n ]2-, n = 0-6, including the stereoisomers for n = 2, 3, 4, are measured at 10 K. The weak intraconfigurational excitations within the t2g4, manifold of Os(lV) are split by spin orbit coupling and lowered symmetry into multiplets, observed in the NIR regions 2600-3100, 4800-5400, 10 500-11 400 and 16 000 17 200 cm-1. The 0-0-transitions are deduced from vibrational fine structure and they are confirmed by electronic Raman bands with the same frequencies

Spectroscopic Studies on Some Benzenethiols

1972 ◽  
Vol 26 (2) ◽  
pp. 270-277 ◽  
Author(s):  
R. H. Abu-Eittah ◽  
R. H. Hilal
Keyword(s):  
Charge Transfer ◽  
Oscillator Strength ◽  
Electronic Absorption ◽  
Intramolecular Charge Transfer ◽  
Electronic Absorption Spectra ◽  
Transition Probability ◽  
Spectroscopic Studies ◽  
Different Types ◽  
Charge Transfer Transitions ◽  
Derivatives Of

The electronic absorption spectra of some derivatives of benzenethiol were studied in the visible-ultraviolet regions in a number of solvents. Solvent effects on the position of band maxima helped in identifying the different types of transitions obtained, namely n → π*, π → π*, and intramolecular charge transfer transitions. Energies of the charge transfer bands were computed theoretically and agreed well with the experimental results. Transition probability coefficients and oscillator strength were calculated for the different transitions. Numerical values of the oscillator strength helped to differentiate between the various types of transitions.

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...

Magneto-optical properties of defect centres in alkali halide crystals

1967 ◽  
Vol 300 (1460) ◽  
pp. 78-93 ◽  
Keyword(s):  
Optical Absorption ◽  
Silver Atom ◽  
Alkali Halides ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Coupling Constant ◽  
Absorption Bands ◽  
Optical Effects ◽  
Alkali Halide Crystals ◽  
Defect Centres

Zeeman spectroscopy is not practicable for the investigation of the structure of electronic conventional states which give rise to broad optical absorption bands in solids. We have investigated the application of Faraday rotation and circular dichroism techniques to absorption bands of neutral silver atoms and F centres in alkali halides. These centres give rise to optical absorption bands due to transitions of the type 2 S → 2 P which are 2000 to 6000 cm -1 in width because, in part, of strong coupling to lattice phonons. A discussion is given of information which may be obtained concerning the electonic states involved in the 2 S → 2 P transition by analysis of the magneto-optical effects by the method of moments. It is shown, for example, that the spin-orbit coupling constant of the 2 P state of the silver atom is reduced from 613 cm -1 in the free state to 365 cm -1 in KCl, to 102 cm -1 in KBr and to an unmeasurably small value in KI. This cancellation of spin-orbit interaction of the silver atom is assigned to symmetry allowed admixtures of lattice ion wavefunctions into the 2 P state.

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