Mechanistic Study of the Photochemical Hydroxide Ion Release from 9-Hydroxy-10-methyl-9-phenyl-9,10-dihydroacridine
摘要:
The excited-state behavior of 9-hydroxy-10-methyl-9-phenyl-9,10-dihydroacridine and its derivative, 9-methoxy-10-methyl-9-phenyl-9,10-dihydroacridine (AcrOR, R = H, Me), was studied via femtosecond and nanosecond UV-vis transient absorption spectroscopy. The solvent effects on C-O bond cleavage were clearly identified: a fast heterolytic cleavage (tau = 108 ps) was observed in protic solvents, while intersystem crossing was observed in aprotic solvents. Fast heterolysis generates 10methyl-9-phenylacridinium (Acr(+)) and -OH, which have a long recombination lifetime (no signal decay was observed within 100 mu s). AcrOH exhibits the characteristic behavior needed for its utilization as a chromophore in the pOH jump experiment.
Photoalkylation of 10-Alkylacridinium Ion via a Charge-Shift Type of Photoinduced Electron Transfer Controlled by Solvent Polarity
作者:Shunichi Fukuzumi、Kei Ohkubo、Tomoyoshi Suenobu、Kouta Kato、Mamoru Fujitsuka、Osamu Ito
DOI:10.1021/ja004311l
日期:2001.9.1
(DeAcrH+) in a nonpolar solvent (benzene) is found to be as efficient as those of 10-methylacridinium cation (MeAcrH+) and DeAcrH+ in a polar solvent (acetonitrile). Irradiation of the absorption bands of MeAcrH+ in acetonitrile solution containing tetraalkyltin compounds (R(4)Sn) results in the efficient and selective reduction of MeAcrH+ to yield the 10-methyl-9-alkyl-9,10-dihydroacridine (AcrHR)
Primary Kinetic Isotope Effects on Hydride Transfer from 1,3-Dimethyl-2-phenylbenzimidazoline to NAD<sup>+</sup> Analogues
作者:In-Sook Han Lee、Eun Hee Jeoung、Maurice M. Kreevoy
DOI:10.1021/ja004232+
日期:2001.8.1
around 1012. This is consistent with Marcus theory of atom transfer, assuming that there are no high-energy intermediates. Within this theory, the perpendicular effect is responsible for most of the change in KIE. The Marcus theory of atom transfer is consistent with a linear, triatomic model of the reaction. Perpendicular effects arise from the systematic decrease of bond distances and increase of bond
Selective Oxygenation of Ring-Substituted Toluenes with Electron-Donating and -Withdrawing Substituents by Molecular Oxygen via Photoinduced Electron Transfer
an electron-withdrawing substituent, p-tolunitrile, is oxygenated by molecularoxygen to yield the corresponding aldehyde with tetrafluoro-p-dicyanobenzene as a photocatalyst under photoirradiation with an Hg lamp (lambda > 300 nm). The oxygenation of a ring-substituted toluene with an electron-donating substituent, p-xylene, by molecularoxygen is also achieved with 10-methyl-9-phenylacridinium ion
Photoinduced Electron Transfer in 9-Substituted 10-Methylacridinium Ions
作者:Takeshi Tsudaka、Hiroaki Kotani、Kei Ohkubo、Tatsuo Nakagawa、Nikolai V. Tkachenko、Helge Lemmetyinen、Shunichi Fukuzumi
DOI:10.1002/chem.201604527
日期:2017.1.26
A series of 9‐substituted 10‐methylacridinium ions (Acr+‐R) in which an electron‐donor moiety (R) is directly linked with an electron‐acceptor moiety (Acr+) at the 9‐position was synthesized, and the photodynamics was fully investigated to determine the rate constants of photoinduced electron transfer (ET) and back electron transfer. The driving forces of photoinduced electron transfer and back electron
AFFINITY LIGANDS AND METHODS FOR PROTEIN PURIFICATION
申请人:Hearn Milton TW
公开号:US20120259094A1
公开(公告)日:2012-10-11
The present invention relates generally to affinity ligands and chemical affinity ligand-matrix conjugates for use as chromatographic adsorbents and methods which utilise the adsorbents in the purification of proteins by affinity chromatography. The affinity ligand-matrix conjugates of the present invention comprise ligands of general formula (I): wherein m represents an integer from 0-2, n represents an integer from 0-6, p represents an integer from 0-4, R
1
represents H or C
1-3
alkyl, R
2
is an optional substituent, and X is the position at which the ligand is immobilized, optionally via a linker.