Trimethylenemethane. Experimental demonstration that the triplet state is the ground state

1976 ◽  
Vol 98 (18) ◽  
pp. 5726-5727 ◽  
Author(s):  
Robert J. Baseman ◽  
David W. Pratt ◽  
Mudan Chow ◽  
Paul Dowd
Keyword(s):  
Triplet State ◽  
Ground State ◽  
Experimental Demonstration

The ground state (1A1) and the lowest triplet state (3B1) of the phenyl cation C6H5+ revisited

1997 ◽  
Vol 106 (18) ◽  
pp. 7541-7549 ◽  
Author(s):  
Jan Hrušák ◽  
Detlef Schröder ◽  
Suehiro Iwata
Keyword(s):  
Triplet State ◽  
Ground State ◽  
Phenyl Cation

Sulfamoyl nitrenes: singlet or triplet ground state?

2018 ◽  
Vol 54 (48) ◽  
pp. 6136-6139 ◽  
Author(s):  
Yan Lu ◽  
Hongmin Li ◽  
Manabu Abe ◽  
Didier Bégué ◽  
Huabin Wan ◽  
...  
Keyword(s):  
Triplet State ◽  
Ground State ◽  
Singlet State ◽  
Minimum Energy ◽  
Closed Shell ◽  
Low Energy ◽  
Energy Minimum ◽  
Triplet Ground State ◽  
Crossing Point

Two prototypical sulfamoyl nitrenes R2NS(O)2–N (R = H and Me) in the triplet state were generated via the closed-shell singlet state by passing a low-energy minimum energy crossing point (MECP).

Structures of polypyridine mononuclear IrIII complexes in the ground state and the lowest triplet state

2009 ◽  
Vol 362 (2) ◽  
pp. 361-371 ◽  
Author(s):  
Naokazu Yoshikawa ◽  
Shinichi Yamabe ◽  
Nobuko Kanehisa ◽  
Yasushi Kai ◽  
Hiroshi Takashima ◽  
...  
Keyword(s):  
Triplet State ◽  
Ground State

Phosphorescence Studies of Reverse Saturable Absorption Materials

1999 ◽  
Vol 597 ◽  
Author(s):  
E. S. Pooler ◽  
C. M. Clark ◽  
S. M. Kirkpatrick
Keyword(s):  
Energy Level ◽  
Triplet State ◽  
Ground State ◽  
Relative Energy ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Absorption And Emission ◽  
Host Polymer

AbstractPhosphorescence studies of reverse saturable absorption materials (RSA) are discussed. Absorption and emission measurements of an RSA material, specifically Zinc 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetraphenylporphyrin (ZnOBP), are performed in a proprietary host polymer. Spectra are analyzed to estimate the relative energy level of the first triplet state of ZnOBP with respect to the ground state.

Radiation and Radiationless Processes in 2,3-Pentanedione; Phosphorescence Lifetime in the Gas Phase

1971 ◽  
Vol 49 (7) ◽  
pp. 987-993 ◽  
Author(s):  
A. W. Jackson ◽  
A. J. Yarwood
Keyword(s):  
Hydrogen Atom ◽  
Triplet State ◽  
Gas Phase ◽  
Ground State ◽  
Hydrogen Atom Abstraction ◽  
Intersystem Crossing ◽  
Phosphorescence Lifetime ◽  
Gaseous State ◽  
Methyl Group ◽  
Intramolecular Hydrogen

Fluorescence and phosphorescence are observed when 2,3-pentanedione in the gaseous state is excited at 365, 405, and 436°nm. The phosphorescence lifetime has been investigated as a function of temperature (298 to 363 °K) and concentration of the diketone (0.5 to 90 × 10−4 M). A mechanism that explains the experimental data is proposed. Apart from the radiative process and an intersystem crossing to the ground state, the triplet state 2,3-pentanedione molecules are removed by two other processes. One is a unimolecular reaction with a rate constant of 1 × 1011 exp (−11.0/RT) s−1 (consistent with an intramolecular hydrogen atom abstraction), and the other is an interaction with ground state molecules. The photochemistry of the triplet state of 2,3-pentanedione is compared with that of biacetyl to consider the effect of substitution of a hydrogen atom by the methyl group on the radiationless processes in diketones.

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