Double-electron excitation channels at the Ca2+ K-edge of hydrated calcium ion

Article Abstract:

The effect of multielectron transitions on the Extended X-ray Absorption Fine Structure (EXAFS) data analysis at the Ca K-edge is determined, by obtaining Ca2+ X-ray absorption spectra in aqueous solution. Analysis shows that the omission of double-electron excitation edges gives rise to unreliable values of the first shell Ca-O coordination number and Debye-Waller (DW) factor.

Science & research, Calcium & Compounds, Research, Excited state chemistry, Calcium compounds, Aqueous solution reactions, Atomic properties

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Aromatic-aromatic interaction between 2,3,5-triphenyl-2H-tetrazolium chloride and poly(sodium 4-styrenesulfonate)

Article Abstract:

The evidence of the binding of 2,3,5-triphenyl-2H- tetrazolium chloride (TTC) to poly(sodium 4-styrenesulfonate) (PSS) by diafiltration, UV-vis spectroscopy and [super 1]H NMR is presented. The oxidizing ability of TTC in the absence and in the presence of the three water-soluble polymers (WSP) is shown by making it react with ascorbic acid (ASC).

Potassium & Sodium Compounds, Sodium & Sodium Compounds, Spectra, Nuclear magnetic resonance, Optical properties, Sodium compounds, Ultraviolet spectroscopy, Structure, Phenyl compounds

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