Excited singlet state reaction of phenosafranine with electron donors Role of the heavy-atom effect in triplet induction

1998 ◽  
Vol 94 (12) ◽  
pp. 1675-1679 ◽  
Author(s):  
Senthil Saravanan Jayanthi ◽  
Perumal Ramamurthy
Keyword(s):  
Singlet State ◽  
Heavy Atom ◽  
Electron Donors ◽  
Excited Singlet State ◽  
Excited Singlet ◽  
Heavy Atom Effect ◽  
Atom Effect

Role of Excited Singlet State in the Photooxidation of Carotenoids:  A Time-Resolved Q-Band EPR Study

1996 ◽  
Vol 100 (2) ◽  
pp. 669-671 ◽  
Author(s):  
A. S. Jeevarajan ◽  
L. D. Kispert ◽  
N. I. Avdievich ◽  
M. D. E. Forbes
Keyword(s):  
Singlet State ◽  
Excited Singlet State ◽  
Excited Singlet ◽  
Time Resolved

BODIPY‐Based Photosensitizers as Potential Anticancer and Antibacterial Agents: Role of the Positive Charge and the Heavy Atom Effect

ChemMedChem ◽  
2020 ◽  
Author(s):  
Jaroslaw Piskorz ◽  
Weronika Porolnik ◽  
Malgorzata Kucinska ◽  
Jolanta Dlugaszewska ◽  
Marek Murias ◽  
...  
Keyword(s):  
Antibacterial Agents ◽  
Positive Charge ◽  
Heavy Atom ◽  
Heavy Atom Effect ◽  
Atom Effect

Fluorescence of chloropentafluoroacetone

1970 ◽  
Vol 48 (16) ◽  
pp. 2611-2616 ◽  
Author(s):  
H. S. Samant ◽  
A. J. Yarwood
Keyword(s):  
Rate Constant ◽  
High Pressures ◽  
Singlet State ◽  
Radiative Lifetime ◽  
Heavy Atom ◽  
Excited Singlet State ◽  
Intersystem Crossing ◽  
Excited Singlet ◽  
Gaseous State ◽  
Fluorescent State

The fluorescence of chloropentafluoroacetone in the gaseous state at room temperature is reported. The fluorescence extends from 337 nm to greater than 560 nm with a maximum intensity at 420 nm and is unaffected by low pressures of oxygen. The energy of the first excited singlet state is estimated as about 83 kcal and the fluorescence data for 313 and "290" nm excitation indicate that fluorescence enhancement occurs as the pressure increases. The fluorescent yield at high pressures [Formula: see text] is independent of the nature of the gas used to attain the high pressure. The lifetime of the fluorescent state is 35.1 ± 0.3 ns.A simple mechanism correlates the experimental observations and the values of the rate constants are considered. The reciprocal of the natural radiative lifetime is calculated to be 6.6 × 105 s−1 and the rate constant assigned to intersystem crossing to the triplet is 2.8 × 107 s−1. A comparison with the data in the literature for hexafluoroacetone shows the effect of substitution by a heavy atom in the fluorinated ketone. It about doubles the value of the rate constant associated with intersystem crossing from the first excited singlet state in the gas phase.

ChemInform Abstract: Role of Excited Singlet State in the Photooxidation of Carotenoids: A Time-Resolved Q-Band EPR Study

ChemInform ◽  
2010 ◽  
Vol 27 (20) ◽  
pp. no-no
Author(s):  
A. S. JEEVARAJAN ◽  
L. D. KISPERT ◽  
N. I. AVDIEVICH ◽  
M. D. E. FORBES
Keyword(s):  
Singlet State ◽  
Excited Singlet State ◽  
Excited Singlet ◽  
Time Resolved

Photochemistry of Nitracrine and its Analogues: Acridine Derivatives as Electron Donors

1984 ◽  
Vol 39 (2) ◽  
pp. 195-200 ◽  
Author(s):  
J. Biedrzycki ◽  
J. Błażejowski ◽  
J. Szychliński ◽  
A. Ledòchowski
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Fluorescence Quenching ◽  
Triplet State ◽  
Uv Radiation ◽  
Electron Acceptor ◽  
Singlet State ◽  
Electron Donors ◽  
Excited Singlet State ◽  
Excited Singlet

Studies on the electron transfer in the excited state from electron donors: acridine, 9- aminoacridine and its derivatives, including nitracrine and its isomers, to CCl4 as a suitable electron acceptor, were undertaken. UV radiation (λ= 366 nm), absorbed only by acridine bases, generates CI- ions. The fluorescence quenching measurements indicate that no interaction appears between molecules of acridine bases in the excited singlet state and CCl4 molecule. A scheme of photochemical processes is proposed which assumes that the triplet state of the base molecule is the reactive one.

Where is the Heavy-Atom Effect? Role of the Central Ligand in Tetragold(I) Ethynyl Complexes

2010 ◽  
Vol 122 (48) ◽  
pp. 9392-9395 ◽  
Author(s):  
Glenna So Ming Tong ◽  
Pui Keong Chow ◽  
Chi-Ming Che
Keyword(s):  
Heavy Atom ◽  
Heavy Atom Effect ◽  
Atom Effect
Sign in / Sign up

Export Citation Format

Share Document