Chemoselective Detection of 2,4,6‐trinitrophenol by Ground State Adduct Formation via Protonation of Quinoline Moiety of Non‐heme Ligands with Structural Evidence

2020 ◽  
Vol 5 (28) ◽  
pp. 8447-8454
Author(s):  
Sarvesh S. Harmalkar ◽  
Ankita V. Naik ◽  
Madhuri K. Nilajakar ◽  
Sunder N. Dhuri
Keyword(s):  
Ground State ◽  
Adduct Formation ◽  
Heme Ligands ◽  
Quinoline Moiety

Stereochemical studies of the photochemical cycloaddition reaction of alkenes with N-benzoylindole and N-carboethoxyindole; evidence for biradical intermediacy

1991 ◽  
Vol 69 (7) ◽  
pp. 1171-1181 ◽  
Author(s):  
David J. Hastings ◽  
Alan C. Weedon
Keyword(s):  
Excited State ◽  
Rate Constant ◽  
Ground State ◽  
Addition Reaction ◽  
Cycloaddition Reaction ◽  
Adduct Formation ◽  
Quantum Yields ◽  
Triplet Excited State ◽  
Marked Contrast ◽  
Cis And Trans

The stereochemistries of the 2 + 2 cycloaddition products obtained from the photochemical addition reaction between N-benzoylindole or N-carboethoxyindole and the alkenes cyclopentene, cyclohexene, cycloheptene, cis- and trans-2-butene, and cis- and trans-4-octene are examined. The structures of the products are shown to be consistent with a photo-cycloaddition mechanism involving the intermediacy of triplet 1,4-biradical species. The quantum yields of adduct formation between N-benzoylindole and both cis- and trans-octene were measured as a function of alkene concentration. The results suggest that cis-octene reacts with the indole derivative's triplet excited state with a rate constant of (1.7 ± 0.3) × 107 M−1 s−1. The results are also consistent with the immediate products of this reaction being 1,4-biradicals, 98% of which revert to the ground state indole derivative and alkene, and only 2% of which proceed to cycloadduct. In marked contrast, the same treatment suggests that trans-octene reacts with the triplet excited state of N-benzoylindole with a rate constant estimated to be in the range of 1 × 106 and 6 × 105 M−1 s−1, and it appears that the 1,4-biradicals formed revert much less efficiently to the starting materials; it is estimated that between 67 and 100% of the 1,4-biradicals proceed to cycloadducts. In the reaction with cis-octene biradical reversion leads to the formation of trans-octene ("Schenk isomerization"); the quantum yield of this process is determined to be 0.074 ± 0.004, which may imply that approximately 75% of the biradicals collapse to cis-alkene and 25% collapse to the trans isomer. Key words: indole, photocycloaddition, 1,4-biradicals.

Renilla Bioluminescence: A Morphologic Approach to the Location of Photocytes

1974 ◽  
Vol 32 ◽  
pp. 208-209
Author(s):  
Ben O. Spurlock ◽  
Milton J. Cormier
Keyword(s):  
Excited State ◽  
Ground State ◽  
Molecular Basis ◽  
Light Emission ◽  
Chemical Basis ◽  
Electronic Excited State ◽  
Colonial Form ◽  
The Common ◽  
Eighteenth And Nineteenth Centuries ◽  
Catalyzed Oxidation

The phenomenon of bioluminescence has fascinated layman and scientist alike for many centuries. During the eighteenth and nineteenth centuries a number of observations were reported on the physiology of bioluminescence in Renilla, the common sea pansy. More recently biochemists have directed their attention to the molecular basis of luminosity in this colonial form. These studies have centered primarily on defining the chemical basis for bioluminescence and its control. It is now established that bioluminescence in Renilla arises due to the luciferase-catalyzed oxidation of luciferin. This results in the creation of a product (oxyluciferin) in an electronic excited state. The transition of oxyluciferin from its excited state to the ground state leads to light emission.

Explicitly correlated Gaussian functions in variational calculations: the ground state of helium dimer

1997 ◽  
Vol 91 (5) ◽  
pp. 909-915 ◽  
Author(s):  
JACEK KOMASA ◽  
JACEK RYCHLEWSKI
Keyword(s):  
Ground State ◽  
Gaussian Functions ◽  
Variational Calculations ◽  
Explicitly Correlated

Progress on high precision calculations for the ground state of atomic lithium

1997 ◽  
Vol 400 (1-2) ◽  
pp. 7-56 ◽  
Author(s):  
F King
Keyword(s):  
High Precision ◽  
Ground State

Effects of urea-adduct formation and physical state on the infra-red spectra of n-paraffin hydrocarbons

1962 ◽  
Vol 18 (4) ◽  
pp. 1505-1514 ◽  
Author(s):  
R DURIE ◽  
R HARRISSON
Keyword(s):  
Physical State ◽  
Adduct Formation ◽  
Urea Adduct ◽  
Infra Red

Theoretical study of the homologous reactions of ground-state oxygen atoms with Br2 and BrCI molecules

1995 ◽  
Vol 92 ◽  
pp. 1214-1232 ◽  
Author(s):  
E Drougas ◽  
AM Kosmas
Keyword(s):  
Ground State ◽  
Theoretical Study ◽  
Oxygen Atoms

The ground state energy of the ±J spin glass from the genetic algorithm

1994 ◽  
Vol 4 (9) ◽  
pp. 1281-1285 ◽  
Author(s):  
P. Sutton ◽  
D. L. Hunter ◽  
N. Jan
Keyword(s):  
Genetic Algorithm ◽  
Spin Glass ◽  
Ground State Energy ◽  
Ground State ◽  
State Energy

Ground State and Excited State H-Atom Temperatures in a Microwave Plasma Diamond Deposition Reactor

1996 ◽  
Vol 6 (9) ◽  
pp. 1167-1180 ◽  
Author(s):  
A. Gicquel ◽  
M. Chenevier ◽  
Y. Breton ◽  
M. Petiau ◽  
J. P. Booth ◽  
...  
Keyword(s):  
Excited State ◽  
Ground State ◽  
Microwave Plasma ◽  
Diamond Deposition
Sign in / Sign up

Export Citation Format

Share Document