Regulation of the extent and dynamics of excited-state proton transfer in 2-(2'-pyridyl)benzimidazole in Nafion membranes by cation exchange

Article Abstract:

The effect of microenvironment of a Nafion membrane on the excited-state proton transfer (ESPT) of 2-(2'-pyridyl)benzimidazole (2PBI) was investigated by steady-state fluorescence spectroscopy. The results suggest that mechanism of ESPT depends on the water content of the membrane, but is slowed down by cation exchange due to dehydration of the membrane, the less acidic environment around 2PBI molecules, and slowing down of the proton-transfer process.

All Other Miscellaneous General Purpose Machinery Manufacturing, Ion Exchange Membranes, General industrial machinery, not elsewhere classified, Electric properties, Protons, Ion-permeable membranes

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Effect of increased hydrophobicity on the binding of two model amphiphilic chlorin drugs for photodynamic therapy with blood plasma and its components

Article Abstract:

The binding of serum albumin and lipoprotein with chlorin p6 and purpurin 18, two structurally related chlorins, is studied to understand the role for these proteins as endogenous carriers for these drugs. Low-density lipoproteins (LDLs) are found to be the preferred carrier for both the compounds, particularly at a slightly acidic pH, resembling the situation in tumor cells.

Biological Product (except Diagnostic) Manufacturing, Biological products exc. diagnostic, Blood Albumin, Protein binding, Lipoproteins, Serum albumin, Structure, Proteolipids

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Excited-state proton transfer of 2-(2'-pyridyl)benzimidazole in microemulsions: Selective enhancement and slow dynamics in aerosol OT reverse micelles with an aqueous core

Article Abstract:

Excited-state proton transfer (ESPT) of 2-(2'-pyridyl)benzimidazole (2PBI) in reverse micelles is studied by steady-state and time-resolved fluorescence spectroscopy. The requirement of ESPT to occur in microheterogenous media is that the medium should be a ternary system comprised of water and a hydrophobic phase separated by a negatively charged interface.

Usage, Excited state chemistry, Fluorescence spectroscopy

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