Inherently dinuclear iridium(III) meso architectures accessed by cyclometalation of calix[4]arene-based bis(aryltriazoles)

Conventional cyclometalation of calix[4]arene bis(aryltriazoles) with iridium(III) chloride hydrate leads to unique meso architectures in which the Ir2Cl2 core is cross-bound by two (C^N)2-ligands, that allows further replacement of the...

Synthesis and crystal structures of [Al(H2O)6](SO4)NO3·2H2O and [Al(H2O)6](SO4)Cl·H2O

Two novel aluminium double salts, [Al(H2O)6](SO4)NO3·2H2O, hexaquaaluminium sulfate nitrate dihydrate, (1), and [Al(H2O)6](SO4)Cl·H2O, hexaquaaluminium sulfate chloride hydrate, (2), were obtained in the form of single crystals. Their crystal structures are each based on an octahedral [Al(H2O)6]3+ unit and both structures have in common one charge-balancing SO4 2− anion. The final positive charge from the aluminium(III) cation is balanced by an NO3 − or a Cl− anion for (1) and (2), respectively. Compound (1) further contains two unligated water molecules while compound (2) only contains one unligated water molecule. In the crystal structures, all components are spatially separated and interactions are mediated via medium–strong hydrogen bonding, compared to many other reported aluminium sulfates where corner-sharing of the building units is common. The two compounds represent rare cases where one aluminium(III) cation is charge-balanced by two different anions.

Polysaccharide-Based Chiral Stationary Phases on Gold Nanoparticles Modified Silica Beads for Liquid-Phase Separation of Enantiomers

Au nanoparticles (AuNPs) (10−15 nm in size) were prepared and deposited on the surfaces of silica particles functionalized using 3-aminopropyltriethoxysilane as the seeds under mild conditions. Then, Au seeds grew further and formed nanosheets by the method of gold chloride hydrate reduction. 3, 5-dimethylphenyl isocyanate derivative of cellulose as chiral selector was coated on the surfaces of SiO2/Au. The obtained spheres possessed a sandwich structure in which silica bead, the packed Au NPs monolayer and cellulose derivative were the core, the interlayer and the shell, respectively. The resultant packing material was evaluated by high-performance liquid chromatography (HPLC) as chiral stationary phase (CSP). The separations of nine pairs of enantiomers were achieved in the normal-phase liquid chromatography mode. The results showed that the new CSP has sufficient interaction with the analytes due to the existence of AuNPs on silica surfaces compared with coated cellulose-silica column.