Liquid-liquid phase separation and microscopic structure in rubidium-ammonia solutions observed using X-ray absorption spectroscopy

Article Abstract:

The phase behavior and microscopic structure of liquid rubidium-ammonia (Rb-NH3) solutions are measured below the consolute temperature (T(sub C)), using the technique of extended X-ray absorption fine structure (EXAFS). Analysis of the EXAFS structure measured above the Rb K-edge absorption at ~15.2 ke V shows that the first solvation sphere of the cation is relatively broad, with ~6.4 N atoms being located at a distance of 2.9-3.5 angstrom.

Spectrum analysis, Rubidium, X-ray spectrometry

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Influence of ion pairing on the UV-spectral behavior of KI dissolved in supercritical NH3: From vapor phase to condensed liquid

Article Abstract:

The objective of the study was to analyze the effect that different species in solutions of KI in a polar solvent have on electronic excitation, that is starting with the isolated (K+I-) pair, going to CIP (contact ion pair) and solvent separated (SSIP) ion pairs, and finally free ions in solution by UV spectroscopy. There is a strong influence of the cation on the electronic transition of dissolved iodide when it is forming CIPs.

Ultraviolet spectroscopy, Atomic properties

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Sequential steps of ammoniation of the microporous silicoaluminophosphates H-SAPO-34 and H-SAPO-37 investigated by in situ steps CF MAS NMR spectroscopy

Article Abstract:

A dual step method was ascertained by studying the ammoniation of the silicoaluminphospates H-SAPO-34 and H-SAPO-37 by in situ (Super 1)H and (super 27)A1 MAS MNR under continuous-flow (CF) conditions. The hydrolysis of the silicoaluminphospate model is obstructed if the connective OH groups are covered by ammonia.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Aluminum Silicate, Analysis, Nuclear magnetic resonance spectroscopy, Aluminum silicates

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