Time-resolved fluorescence anisotropy in assessing side-chain and segmental motions in polyamines entrapped in sol-gel derived silica

Article Abstract:

The side-chain and backbone dynamics of two model polymines, polylysine (PL) and poly(allylamine) (PAM), is examined with time-resolved fluorescence anisotropy (TRFA) in aqueous solution and when the polyamines are entrapped into sol-gel derived silica. The findings indicate that the dynamics of proteins entrapped in silica must be viewed with caution, as it is possible to have a significant dynamic motion even when proteins interact with the matrix.

Observations, Fluorescence, Proteins, Optical properties, Chemistry, Physical and theoretical, Physical chemistry

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Excited-state amine-imine double proton transfer in 7-azaindoline

Article Abstract:

Ground-state thermodynamics and excited-state amine/imine tautomerism in 7-azaindoline mediated by hydrogen bond formation are studied by means of absorption and emission spectrocopies. The results in combination with a comparative study on 7-azaindole, generalize the amine/imine tautomerism, which could be fine-tuned by the length of pie electron conjugation coupled with types associated guest molecules.

Hydrogen bonding, Thermodynamics, Emission spectroscopy, Atomic emission spectroscopy

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Electrogenerated chemiluminescence. 76. excited singlet state emission vs excimer emission in ter(9,9-diarylfluorene)s

Article Abstract:

The photophysical properties, electrochemistry, and electrogenerated chemiluminescence (ECL) of two different ter(9,9-diarylfluorene)s, TDAF is reported. In this process, the formation of excimers was mainly from a reaction of oppositely charged radical ions.

Usage, Electric properties, Electrochemistry, Fluorine compounds, Chemical properties, Chemiluminescence

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