Mechanisms of electron injection from retinoic acid and cartenoic acids to TiO(sub 2) nanoparticles and charge recombination via the T(sub 1) state as determined by subpicosecond to microsecond time-resolved absorption spectroscopy: Dependence on conjugation length

Article Abstract:

The subpicosecond time-resolved absorption spectra were recorded free in solution and bound to TiO(sub 2) nanoparticles in suspension to examine the mechanisms of electron injection to TiO(sub 2) in retinioc acid (RA) and carotenoic acid (CAs) including RA5, CA6, CA7, CA8, CA9, and CA11 with conjugated double bonds n = 5,6,7,8,9,11. Energy gap between CBE and Ti levels being consistent, the generation of Ti state decreased in the order RA5 > CA6 > CA7 > CA8.

Titanium dioxide, Tretinoin, Chemical properties, Nanoparticles

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NMR chemical shift references for binding constant determination in aqueous solutions

Article Abstract:

The chemical shifts of various compounds including cyclic and acyclic saccharides, oligoglycines, and sodium chloride using an external reference in terms of volume magnetic susceptibilities and molar volumes of these compounds is investigated. The equilibrium formation constant and structure of ion-pair of tetrathylammonium (TMA) and benzenesulfonate ion (BS) are estimated from chemical shifts referred to an internal standard.

All Other Basic Inorganic Chemical Manufacturing, Potassium & Sodium Compounds, Sodium & Sodium Compounds, Nuclear magnetic resonance, Magnetic properties, Sodium compounds

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Localized excitations on the B850b bacteriochlorophylls in the LH2 antenna complex from Rhodospirillum molischianum as probed by the shifts of the carotenoid absorption

Article Abstract:

An examination on the excited-state dynamics of B850s, which was probed by the time-dependent changes in the carotenoid (Car) adsorption, referring to those in the bacteriochlorophyll (BChl) absorption is presented. The examination conclude that the localized excitation is present in the B850 ring strongly contrast to the generally accepted idea that the excitation is partially or completely delocalized over the B850 ring.

Analysis, Carotenoids, Dynamics, Dynamics (Mechanics)

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