Thermal analysis, nuclear magnetic resonance spectroscopy, and impedance spectroscopy of N,N-dimethyl-pyrrolidinium iodide: An ionic solid exhibiting rotator phases

N,N-dimethyl-pyrrolidinium iodide has been investigated using differential scanning calorimetry, nuclear magnetic resonance (NMR) spectroscopy, second moment calculations, and impedance spectroscopy. This pyrrolidinium salt exhibits two solid-solid phase transitions, one at 373 K having an entropy change, Delta S, of 38 J mol(-1) K-1 and one at 478 K having Delta S of 5.7 J mol(-1) K-1. The second moment calculations relate the lower temperature transition to a homogenization of the sample in terms of the mobility of the cations, while the high temperature phase transition is within the temperature region of isotropic tumbling of the cations. At higher temperatures a further decrease in the H-1 NMR linewidth is observed which is suggested to be due to diffusion of the cations. (C) 2005 American Institute of Physics

Integration of Russia into theWorld Economy and Globalization of StockMarkets

Correlations between Russian and some world leading stock market indices were analyzed to assess a degree of global integration of Russian economy. For this purpose, a new method of time-shift asymmetric correlation analysis was used. The method helps identify which stock market sets the pace and which one follows the lead. The analysis showed a growing trend in global integration of Russian economy. Particularly, it was shown that Russian stock market is getting more correlated with the European stock market while the leading (pace making) role of the U.S. markets keeps growing in the recession of 2008