Carbon-13 nuclear magnetic resonance spectra. XVI—lanthanide induced signal shifts of diastereotopic 13C nuclei as a probe for a conformational equilibrium

The ¹³C NMR signals of the two methyl groups in 4-hydroxy-1-isopropyl-2-oxaadamantane are anisochronous in the presence of Yb(fod)₃. This is interpreted in terms of the different populations of three rotational conformers.     

Barrier to internal rotation of the silyl group in cyclopropyl silane from the MW spectrum in the first excited torsional state

The MW spectrum of the first excited state of the internal rotation of the silyl group in cyclopropyl silane has been recorded and analyzed in the frequency region 6.9–38.0 GHz. Recordings were made with conventional Stark spectroscopy as well as with MW-MW double resonance. From the analysis of the torsional splittings the following parameters were derived: V₃=1917.6(44)cal/mole, I_α=5.888(14)u^*A², V_a=21.56(21)°     

Connected and Disconnected? On the Impact of Internet Use on Social Connectedness

Based on Durkheim's idea that social differentiation in modern societies leads to division of labour and to increasing alienation between individuals some authors argue that the use of new technologies like the Internet will promote social isolation. Such a tendency towards a decline in Social Capital has been reported for the U.S. while citing decreasing numbers of membership in diverse organisations. The paper investigates similar tendencies for Switzerland and discusses the appropriateness of respective measures of social capital.