The synthesis and spectroscopic investigation of aza-crown ethers with anthraquinoneand 1-aminoanthraquinone-functionalized side chains are described. Cation-induced shifts in the UV/VIS absorption spectra of the ligands dissolved in propylene carbonate are observed only for Li+ among the alkali metal ions and for Mg2+ among the alkaline earth metal ions as well as for Ag+ and T1+. Only hypsoch...

The straightforward metathesis of 1-lithio-2-tbutyl-1,2-dihydropyridine using metal tert-butoxide (Na/K) has resulted in the first preparation and isolation of a series of heavier alkali metal dihydropyridines. By employing donors, TMEDA, PMDETA and THF, five new metallodihydropyridine compounds were isolated and fully characterised. Three distinct structural motifs have been observed; a dimer,...

Leucites are tetrahedrally coordinated silicate framework structures with some of the silicon cations partially replaced by divalent or trivalent cations. These have general formulae A 2 B Si 5 O 12 and AC 6 ; where is a monovalent alkali metal cation, C cation. In this paper, we report Rietveld refinements three more synthetic leucite analogues stoichiometries Cs NiSi , RbGaSi CsGaSi . Ia $\ba...

The effects of varying the alkali metal cation in the high-temperature nucleophilic synthesis of a semi-crystalline, aromatic poly(ether ketone) have been systematically investigated, and striking variations in the sequence distributions and thermal characteristics of the resulting polymers were found. Polycondensation of 4,4-dihydroxybenzophenone with 1,3-bis(4fluorobenzoyl)benzene in diphenyl...

The adsorption of small amounts of alkali metal atoms (Li, Na, K, Rb, and Cs) on the surface of MgO powders and thin films has been studied by means of EPR spectroscopy and DFT calculations. From a comparison of the measured and computed g values and hyperfine coupling constants (hfccs), a tentative assignment of the preferred adsorption sites is proposed. All atoms bind preferentially to surfa...

The addition of simple salt to a solution of conjugated polyelectrolyte can lead to substantial changes in its optical properties caused by the conformational change of the polymer chain. The effect of the addition of alkali metal and tetraalkylammonium chlorides to solutions of lithium salt of poly(thiophen-3-ylacetic acid) is investigated by NMR. The fractions of free alkali metal counterions...

Understanding the interaction of ions with organic receptors in confined space is fundamental importance and could advance nanoelectronics sensor design. In this work, metal ion complexation conformationally varied thiacalix[4]monocrowns bearing lower-rim hydroxy (type I), dodecyloxy II), or methoxy III) fragments was evaluated. At liquid–liquid interface, alkylated thiacalixcrowns-5(6) selecti...

The kinetics of the hydrogen evolution reaction (HER) at gold electrodes is affected by concentration alkali metal cations and electrolyte pH. At moderately alkaline pH, increasing cation greatly enhances HER activity. Cations are proposed to help stabilize transition state rate-determining Volmer step a favorable interaction with dissociating water molecule (*H–OHδ−–cat+).

Explorations of the A(1+)-RE(3+)-Mo(6+)-O(2-) (A(1+) is an alkali metal cation, RE(3+) is a rare-earth metal cation) quaternary systems prepared by the high-temperature solution growth method led to the title structure, sodium erbium bis-(molyb-date), NaEr(MoO(4))(2). It is isostructural to the scheelite structure (CaWO(4)) and is composed of [MoO(4)](2-) tetra-hedra with symmetry and [(Na/Er)O...

The adsorption and desorption of N2O on main-group ion-exchanged ZSM-5 was studied using temperature-programmed desorption (TPD) and density functional theory (DFT) calculations. TPD experiments were carried out to determine the desorbed temperature Tmax corresponding to the maximum mass intensity of N2O desorption peak and adsorption capacity of N2O on metal-ion-exchanged ZSM-5s. The results i...