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Magnetic and structural anomalies of NanC60 (n = 2, 3)

100%

Kulbachinskii V., Bulychev B., Kytin V., Krechetov A., Tarasov V., Konstantinova E., Velikodnyi Y., Muravlev Y., Zoteev A.

Open Physics

2010

vol. 8

issue 1

101-112

Sodium fullerides NanC60 (n = 2, 3) have been synthesized by a liquid phase reaction and investigated with X-ray diffraction (XRD), nuclear magnetic resonance (NMR), electron paramagnetic resonance, and differential thermal analysis. XRD data indicate that the crystal structure of Na2C60 at 300 K is face centered cubic (FCC). A phase transition from primitive cubic to FCC crystal structure has been observed in this work in Na2C60 fulleride at 290 K. The transition is accompanied by the step-like change of paramagnetic susceptibility. The crystal structure of Na3C60 is more complicated than, and different from, what has been reported in the literature. A nearly seven-fold increase of paramagnetic susceptibility with increasing temperature has been observed in the Na3C60 fulleride at 240–260 K. In the same temperature range, a new line at about 255 ppm appears in the 23Na NMR spectrum, indicating a significant increase of electron density near the Na nucleus. The observed effect can be explained by a metal-insulator transition caused by a structural transition.

The interaction of new oxicam derivatives with lipid bilayers as measured by calorimetry and fluorescence spectroscopy

86%

Maniewska J., Gąsiorowska J., Szczęśniak-Sięga B., Michalak K.

Acta Biochimica Polonica

2018

vol. 65

issue 2

185-191

The purpose of the present work was to assess the ability of five new oxicam analogues to interact with the lipid bilayers. To characterize the interaction of newly synthesized NSAIDs (non-steroidal anti-inflammatory drugs) analogues with DPPC lipid bilayers the two following techniques were applied - differential scanning calorimetry (DSC) and fluorescence spectroscopy. The results obtained by these experimental approaches show that new oxicams analogues interact with the lipid model membranes under consideration. As demonstrated both in calorimetric and spectroscopic studies, the greatest influence on the thermotropic properties of the lipid membrane and on the quenching of fluorescence of Laurdan and Prodan was exerted by a derivative named PR47 containing in its structure a two-carbon aliphatic linker with a carbonyl group, as well as bromine and trifluoromethyl substituents.

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1 Acta Biochimica Polonica

1 Open Physics

1 2018

1 2010

1 Bulychev B.

1 Gąsiorowska J.

1 Konstantinova E.

1 Krechetov A.

1 Kulbachinskii V.

1 Kytin V.

1 Maniewska J.

1 Michalak K.

1 Muravlev Y.

1 Szczęśniak-Sięga B.

1 Tarasov V.

1 Velikodnyi Y.

1 Zoteev A.

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Magnetic and structural anomalies of NanC60 (n = 2, 3)

The interaction of new oxicam derivatives with lipid bilayers as measured by calorimetry and fluorescence spectroscopy