Robust Triplet Molecule:  Cationic Diradical of 3,4‘-Bis(diphenylamino)stilbene

1999 ◽  
Vol 11 (8) ◽  
pp. 1969-1971 ◽  
Author(s):  
Tsuyoshi Michinobu ◽  
Masahiro Takahashi ◽  
Eishun Tsuchida ◽  
Hiroyuki Nishide
Keyword(s):  
Triplet Molecule

Calculating chemical electron-polarization in triplet-molecule reactions

1986 ◽  
Vol 22 (2) ◽  
pp. 189-192
Author(s):  
Yu. A. Serebrennikov ◽  
B. F. Minaev ◽  
R. R. Mukhin ◽  
Z. M. Muldakhmetov
Keyword(s):  
Triplet Molecule ◽  
Electron Polarization

Intermediate-paramagnetic phases with a half and a quarter spin entities in fluorinated biphenyl-3,5-diyl bis(tert-butyl nitroxides)

2015 ◽  
Vol 3 (30) ◽  
pp. 7813-7818 ◽  
Author(s):  
Takuya Konno ◽  
Hiroki Kudo ◽  
Takayuki Ishida
Keyword(s):  
Single Phase ◽  
Spin Transition ◽  
Triplet Molecule ◽  
Tert Butyl

A ground-triplet molecule 25FBPBN showed spin-transition-like behaviour with a small hysteresis, while 3FBPBN maintained a single phase.

The Elusive Ethenediselone, Se=C=C=Se

2014 ◽  
Vol 67 (9) ◽  
pp. 1195 ◽  
Author(s):  
Carl Th. Pedersen ◽  
Ming Wah Wong ◽  
Kazuo Takimiya ◽  
Pascal Gerbaux ◽  
Robert Flammang
Keyword(s):  
Mass Spectrometry ◽  
Ground State ◽  
Matrix Isolation ◽  
Triplet Molecule ◽  
Precursor Molecules

The neutral ethenediselone, Se=C=C=Se, has been characterised by neutralisation–reionisation mass spectrometry, which implies a minimum lifetime of the order of microseconds. Tetraselenafulvalene 1 and tetramethyltetraselenafulvalene 2 were used as precursor molecules. Flash vacuum thermolysis (FVT) of these compounds with isolation of the products in Ar matrices permitted the identification of ethyne, 2-butyne, CSe2, and selenoketene, H2C=C=Se, but at best traces of Se=C=C=Se survived the FVT/matrix isolation experiment. Multiconfigurational calculations indicate that Se=C=C=Se is a ground state triplet molecule with a very small singlet-triplet gap.

scholarly journals Oxygen-catalysed sequential singlet fission

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Nikolaus Wollscheid ◽  
J. Luis Pérez Lustres ◽  
Oskar Kefer ◽  
Sebastian Hahn ◽  
Victor Brosius ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Single Step ◽  
Visible Spectral Range ◽  
Triplet States ◽  
Atmospheric Conditions ◽  
Singlet Fission ◽  
Triplet Molecule ◽  
Singlet Exciton ◽  
Sequential Mechanism ◽  
Sequential Formation

AbstractSinglet fission is the photoinduced conversion of a singlet exciton into two triplet states of half-energy. This multiplication mechanism has been successfully applied to improve the efficiency of single-junction solar cells in the visible spectral range. Here we show that singlet fission may also occur via a sequential mechanism, where the two triplet states are generated consecutively by exploiting oxygen as a catalyst. This sequential formation of carriers is demonstrated for two acene-like molecules in solution. First, energy transfer from the excited acene to triplet oxygen yields one triplet acene and singlet oxygen. In the second stage, singlet oxygen combines with a ground-state acene to complete singlet fission. This yields a second triplet molecule. The sequential mechanism accounts for approximately 40% of the triplet quantum yield in the studied molecules; this process occurs in dilute solutions and under atmospheric conditions, where the single-step SF mechanism is inactive.

ENDOR Spectra of Pyrene Excited Triplet State in Naphthalene-TCNB Crystals

1990 ◽  
Vol 45 (11-12) ◽  
pp. 1317-1324 ◽  
Author(s):  
Carlo Corvaja ◽  
Andrea Lodolo ◽  
Anna Lisa Maniero
Keyword(s):  
Triplet State ◽  
Ground State ◽  
Relative Orientation ◽  
Plane Symmetry ◽  
Spin Distribution ◽  
Triplet Molecule ◽  
Excited Triplet ◽  
Pyrene Molecule ◽  
Endor Spectroscopy ◽  
Ground State Molecule

AbstractTriplet state traps, observed on optically excited single crystals of Naphthalene-TCNB doped with Pyrene, have been studied by EPR and ENDOR spectroscopy. The magnetic resonance lines recorded at low temperature (20 K) are shown to be due to triplet excitations localized almost completely on a Pyrene molecule. The complete hyperfine tensors of all the protons have been determined. The spin distribution is shown to be distorted in such a way that the triplet Pyrene molecule lacks the in-plane symmetry axes of the ground state molecule. The orientation of the triplet molecule in the crystal lattice and the relative orientation of Pyrene and TCNB are also discussed.

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