Lm Litvinenko Institute Of Physical Organic Chemistry And Coal Chemistry

Donets’k, Ukraine

Lm Litvinenko Institute Of Physical Organic Chemistry And Coal Chemistry

Donets’k, Ukraine
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Kucherenko V.A.,Lm Litvinenko Institute Of Physical Organic Chemistry And Coal Chemistry | Tamarkina Yu.V.,Lm Litvinenko Institute Of Physical Organic Chemistry And Coal Chemistry | Frolova I.B.,Lm Litvinenko Institute Of Physical Organic Chemistry And Coal Chemistry
Voprosy Khimii i Khimicheskoi Tekhnologii | Year: 2017

The changes of supramolecular structure and electronic subsystem of anthracites caused by impregnation with alkali metal hydroxides MOH (M=Li, Na, K, Rb, and Cs) at MOH/coal ratios of RMOH<2 mmol g-1 were studied. The interlayer distance (d002), polyarene layers number (N), layer average diameter (L), height (L) and volume (Vcr) of coal crystallites were evaluated. The following conclusions were drawn for anthracite with carbon content of 94.6%: (1) an increase in M+ diameter causes a decrease in d002 and an increase in Lc and Vcr; (2) the d002 values linearly decrease with the cation electronic polarizability. The influence of MOH on the following paramagnetic characteristics was studied: line width (AH), unpaired electron concentration ([e-]) and sensitivity to adsorbed oxygen; the latter manifests itself as simultaneous lowering [e-] and broadening AH. The initial broadening rate decreases strictly linearly (&0.99) with increasing cation polarizability. The manifestation of impregnated anthracites properties of magnetically ordered substances was estimated, namely, the appearance of supra wide EPR signals with anomalously large intensity, depending on alkali amount and properties of anthracite spatial framework. The intercalated alkali is concluded to create new structural centres due to the interaction of M+ cation with p-system of polyarene layer in crystallite, to enhance collective spin interactions due to transfer of electrons from valence zone to conduction one, and to complicate exchange interactions between radicals within anthracite spatial framework.


Savsunenko O.,Lm Litvinenko Institute Of Physical Organic Chemistry And Coal Chemistry | Savsunenko O.,CNRS Laboratory for Molecular and Photochemical Reactions | Matondo H.,CNRS Laboratory for Molecular and Photochemical Reactions | Franceschi-Messant S.,CNRS Laboratory for Molecular and Photochemical Reactions | And 5 more authors.
Langmuir | Year: 2013

We report on a new approach for creating water-soluble functionalized vesicles employing N-alkyl-3-boronopyridinium triflates (alkyl = Me, C 12H25, C16H33) as sensors for monosaccharides. The nanoaggregate properties were studied by means of DLS, TEM, high-resolution 1H NMR, and the solvatochromic dyes Reichardt's betaine and Methyl Orange. The vesicles were shown to have 30-200 nm diameters depending on the amphiphile chain length. Diol binding to the vesicles was studied by steady-state fluorescence and UV-vis using Alizarin Red S as a probe in the solution at pH 7.4 in the presence and in the absence of d-glucose and d-fructose. Strong sensing ability of boronic acid functional moieties in the order d-fructose > d-glucose was demonstrated, and apparent binding constants were estimated. © 2013 American Chemical Society.

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