Combined Experimental and Theoretical Studies on Planar Chirality of Partially Overlapped -Symmetric [3.3](3,9)Dicarbazolophanes.

Partially overlapped dicarbazolophanes exhibit a planar chirality. In this study, -symmetrical [3.3](3,9)dicarbazolophane derivatives (-) have been optically resolved by preparative chiral high-performance liquid chromatography for the first time.

Guest molecular size-dependent inclusion complexation of parabens with cholic acid by cogrinding.

Effects of p-hydroxybenzoate (paraben) ester chain length on the stoichiometry and structure of grinding-induced inclusion complexes with cholic acid (CA) were investigated. Physicochemical properties of the ground mixture were evaluated by powder X-ray diffraction (PXRD), differential scanning calorimetry (DSC), Fourier transform infrared (FT-IR) spectroscopy, and solid-state nuclear magnetic resonance (NMR) measurements. Ethyl-, n-propyl-, and isopropyl-parabens formed equimolar inclusion complexes with CA, and the complex structures were of the β-trans bilayer type.

Mixed-metal complexes incorporating platinum and lanthanide centers for selective binding and chirality sensing of succinates.

A chromophoric platinum complex was combined with a nonacoordinated cyclen-lanthanide complex to give a new series of mixed-metal receptors. They specifically formed 1:1 complexes with dicarboxylates and offered selective chirality sensing of succinates.

Synthesis and properties of trans-3',4'-bridged nucleic acids having typical S-type sugar conformation.

The synthesis of nucleoside analogues with a conformationally restricted sugar moiety is of great interest. The present research describes the synthesis of BNA (bridged nucleic acid) monomers 1 and 2 bearing a 4,7-dioxabicyclo[4.3.

Exchange interaction of 5,5'-(m- and p-phenylene)bis(10-phenyl-5,10-dihydrophenazine) dications and related analogues.

[structures: see text] 5,5'-(m-Phenylene)bis[(10-aryl-5,10-dihydrophenazine) dications, 3a2+ and 3b2+, and their p-analogues 4a2+ and 4b2+, were prepared, and their exchange interaction was investigated. The EPR spectra of these dications at 123 K in a butyronitrile matrix showed the population of a triplet state. The temperature dependence of the EPR signal intensity (absolute value(delta m(s)) = 2) showed that these dications had singlet ground states with deltaE(ST)/k(B) = -27 to -21 K for the m-isomer 3(2+) and with deltaE(ST)/k(B) = -10 to -8 K for the p-isomer 4(2+).