نتایج جستجو برای: kinetic triplet
تعداد نتایج: 98741 فیلتر نتایج به سال:
Cholesterol (Ch) is an important lipidic building block and a target for oxidative degradation, which can be induced via free radicals or singlet oxygen ((1)O2). Suprofen (SP) is a nonsteroidal anti-inflammatory drug that contains the 2-benzoylthiophene (BZT) chromophore and has a π,π* lowest triplet excited state. In the present work, dyads (S)- and (R)-SP-α-Ch (1 and 2), as well as (S)-SP-β-C...
Title of Dissertation: AQUEOUS PHOTOCHEMISTRY OF 1,4BENZOQUINONES AND THEIR POSSIBLE ROLE IN THE PHOTOCHEMISTRY OF NATURAL ORGANIC MATTER Daqing Gan, Doctor of Philosophy, 2005 Dissertation Directed By: Professor Neil V. Blough Department of Chemistry and Biochemistry Past research implicated the presence of an organic species as a photochemical source of OH radical in natural waters. Quinones ...
A heavy particle impact vibrational excitation and dissociation model for CO2 is presented. This state-to-state based on the forced harmonic oscillator (FHO) theory, which more accurate than current state-of-the-art kinetic models of first-order perturbation theory. The first excited triplet state 3B2 CO2, including its structure, considered in our model, a consistent approach to also proposed....
Although triplet repeat DNA sequences are scattered throughout the human genome, their biological function remains obscure. To aid in correlating potential structures of these nucleic acids with their function, we propose their classification based on the presence or absence of a palindromic dinucleotide within the triplet, the G + C content, and the presence or absence of a homopolymer. Five c...
Bodipy is used for the preparation of Pt(II) bisacetylide complexes which show strong absorption of visible light and long-lived triplet state. Room temperature (RT) near-IR phosphorescence of Bodipy was observed. The π-conjugation framework of visible light-harvesting Bodipy ligand was connected to the Pt(II) center by the C≡C bond. The complexes were used as triplet photosensitizers for tripl...
We employ two-photon spectroscopy to study the vibrational states of the triplet ground state potential (a3Σ+) of the 23Na6Li molecule. Pairs of Na and Li atoms in an ultracold mixture are photoassociated into an excited triplet molecular state, which in turn is coupled to vibrational states of the triplet ground potential. Vibrational state binding energies, line strengths, and potential fitti...
Mechanistic studies of a general reaction that decages a wide range of substrates on exposure to visible light are described. The reaction involves a photochemically initiated reduction of a quinone mediated by an appended thioether. After reduction, a trimethyl lock system incorporated into the quinone leads to thermal decaging. The reaction could be viewed as an electron-transfer initiated re...
The geometries of IO, HCIO, ICH2O, CH3IO, CH3OI, CH2IOH, and ICH2OH have been obtained at the HF and MP2(FU)/6-31G(d) levels of ab initio theory, and the HF/6-31G(d) frequencies are compared with experimental assignments where these are available. The Gaussian-2 method was used to provide thermochemical data for use in atmospheric and combustion modeling. Transition states that connect these sp...
The primary events in bacterial photosynthesis have been studied since it became possible [l] to isolate reaction centers of photosynthetic bacteria, e.g., of Rhodopseudomonas sphaeroides. Within <lO ps [2,3] after excitation of bacteriochlorophyll to its first excited singlet state, the radical pair state PF is formed consisting of a bacteriochlorophyll dimer cation (Bdhl); and a bacteriopheop...
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