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[en] 2-Hydroxy-1-naphthaldehyde oxime (receptor 1) serves as a selective chemosensor for cyanide anion (CN"−). In the presence of CN"−, an enhanced fluorescent intensity and red-shift were observed. The observed complexation between receptor 1 and CN"− may cause by a hydrogen bonding interaction between the OH group of receptor 1 and CN"−. - Highlights: • 2-Hydroxy-1-naphthaldehyde oxime serves as a selective chemosensor for CN"−. • In the presence of CN"−, an enhanced fluorescent and red-shift were observed
[en] A simple quinoline derivative (quinoline-base sensor) was synthesized and investigated by its sensing properties towards various metal ions in CH3CN. Quinoline-base sensor showed a highly selective fluorescent enhancement towards Mg2+. The association constant of a 1:1 complex between quinoline-base sensor and Mg2+ was determined as 1.91×107 M−1. The detection limit of quinoline-base sensor for the analysis of Mg2+ ion was determined as 19.1 ppb; this value is below the maximum permissible level for drinking water.
[en] To study the origin of negative thermal expansion effects near the superconducting transition temperature T_C in MgB_2, low-temperature high-energy synchrotron radiation x-ray diffraction was used to probe the charge redistribution near the boron atoms. Our results reveal that the in-plane hole-distribution of B"− hops through the direct orbital overlap of Mg"2"+ along the c-axis at 50 K and is re-distributed out-of-plane. This study shows that the out-of-plane π-hole distribution plays a dominant role in the possible origin of superconductivity and negative thermal effects in MgB_2. (paper)
[en] We report on the formation and spontaneous self-organization of Cu2O/CuO core-shell nanowires from individual copper nanoparticles. The growth process is interpreted using the results of time-dependent in situ x-ray diffraction. High-resolution transmission electron microscopy is used to observe the intermediate state of pearl-necklace-like aggregates that form a chain-like configuration of Cu2O nanoparticles intertwined into nanowires. The existence of an amorphous CuO shell is confirmed by the XANES technique and explained through an intensity simulation using a proposed core-shell nanowire model.