Ionochromic effects and structures of metalated poly(p-phenylenevinylene) polymers incorporating 2,2'-bipyridines

Article Abstract:

A new study investigates the optical properties, including the ionochromic effects, of metal-ion-incorporated polymers.

Chemistry, Physical and theoretical, Physical chemistry, Chelates, Optical materials

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Intramolecular electron transfer across amino acid spacers in the picosecond time regime. Charge-transfer interaction through peptide bonds

Article Abstract:

The intramolecular electron transfer across a series of alanine-based peptides with 1-3 amino acid residues was investigated in the picosecond time regime. The radical-ion pair, consisting of the Pyr as the electron acceptor and the dimethyl-1,4-benzenediamine (DMPD) as the electron donor, were found to exhibit multiexponential decay kinetics. The falloff rate of constants for ion pair recombination was found to be irregular in terms of the through-bond distance separating Pyr and DMPD groups.

Peptides, Binding sites (Biochemistry), Active sites (Biochemistry), Alanine, Amino acids

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Time-resolved x-ray absorption determination of structural changes following photoinduced electron transfer within bis-porphyrin heme protein models

Article Abstract:

The structural changes occurring after photoinduced electron transfer occurs within bis-porphyrin heme protein models has been studied through time domain energy dispersive x-ray adsorption spectroscopy. Results indicate that electron transfer takes place from the lowest excited triplet state of a Zn porphyrin attached at a fixed distance of 25 angstroms to a long spacer molecule to an Fe(III) porphyrin. The reduction of Fe(III) to Fe(II) is accompanied by a weakening of the bond between the Fe atom and a pyridine molecule ligated to it.

Proteins, Molecular structure, Protein structure, Spectra, Porphyrins

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