The interior water pool of aerosol OT (AOT) reverse micelles tends toward bulk water properties as the micelle size increases. Thus, deviations from bulk water behavior in large reverse micelles are less expected than in small reverse micelles. Probing the interior water pool of AOT reverse micelles with a highly charged decavanadate (V(10)) oligomer using (51)V NMR spectroscopy shows distinct changes in solute environment. For example, when an acidic stock solution of protonated V(10) is placed in a reverse micelle, the (51)V chemical shifts show that the V(10) is deprotonated consistent with a decreased proton concentration in the intramicellar water pool. Results indicate that a proton gradient exists inside the reverse micelles, leaving the interior neutral while the interfacial region is acidic.

A new approach for achieving spatially correlated localized surface plasmon resonance (LSPR) spectroscopy and atomic force microscopy (AFM) imaging based on through-the-objective white light total internal reflection (TIR) is described. Using this technique, we successfully demonstrate spatially correlated measurements as well as the effect of tip-nanoparticle interactions including the ability to controllably manipulate nanoparticle position. Significant red shifts are observed in the LSPR spectra of single nanoparticles with successive AFM scans in ambient conditions. Identical experiments performed under water conclusively show that the shifts are caused by the small amount of water that collects between the tip and the sample in ambient AFM.

Key indicators: single-crystal X-ray study; T = 173 K; mean (C-C) = 0.002 Å; R factor = 0.032; wR factor = 0.095; data-to-parameter ratio = 12.3.In the title co-crystal, C 18 H 12 N 6 O 2 ÁCHCl 3 , intramolecular Cl 3 C-HÁ Á ÁN hydrogen-bonding interactions occur between a single CHCl 3 and both N atoms at the 1,10-positions on the phenanthroline portion of the molecule. The interplanar distance between inversion-related molecules is 3.241 (2) Å . Table 1 Hydrogen-bond geometry (Å , ). We gratefully acknowledge the financial support of the National Science Foundation (CHE-0722547) to KAW. Related literature