A series of dinuclear Pd(II) and Pt(II) with central rectangular cavities have been self-assembled using pyridyl carboxylates as spacers and phosphines [1,1'-bis(diphenylphosphino)ferrocene (dppf) and triphenylphosphines] as supporting ligands. Some of these function as metallacrowns by capturing adventitious alkali or alkali earth metals ions. Two of the Pt(II) rings bind selectively to Na(+) ...

Small monovalent ions are able to polarize carbonaceous nanostructures significantly. We report a systematic investigation of how monovalent and divalent ions influence valence electronic structure of graphene. Pure density functional theory is employed to compute electronic energy levels. We show that the lowest unoccupied molecular orbital (LUMO) of an alkali ion (Li(+), Na(+)) fits between t...

Transition metals are essential components of important biomolecules, and their homeostasis is central to many life processes. Transmembrane transporters are key elements controlling the distribution of metals in various compartments. However, due to their chemical properties, transition elements require transporters with different structural-functional characteristics from those of alkali and ...

This review presents a strategy for management of poly vinyl chloride (PVC) waste by chemical modification as a viable method. PVC contains chlorine as a source to attack by nucleophiles (Nu-) and resultant product can be used for various applications due to its conductivity, antibacterial and ion exchange properties. Prominently used Nuare I-, SCN-, OH-, N3 -, phthalimide anion and concentrate...

CONJUGATES OF PURINE AND PYRIMIDINE NUCLEOSIDES: thymidine and 2'-deoxyguanosine with cobalt-metallacarborane were studied for their sodium ion complexing properties. Formation of stable complexes of 1 : 1 stoichiometry was proved by ESI MS spectroscopy and (23)Na NMR. Equilibrium constants and energies of complex formation were calculated. Complexation of alkali-metals by nucleoside-metallacar...

Glasses in a wide range of chemical composition were thermally poled and the stability of the second-order optical nonlinearity induced was studied through isothermal annealing experiments. Enhanced stability was found in aluminosilicate and aluminoborosilicate with respect to silica ~at least a five order of magnitude increase in lifetime!. Such dramatic enhancement was explained by the strong...

We designed a facile one-pot method to synthesize iron oxide/activated carbon nanotubes (IO/ACNTs) using as-prepared carbon nanotubes (APCNTs) modified by alkali solid-activation. The open-ended CNTs and iron oxide loading could be realized in one step. The resulting IO/ACNT hybrids, as an anode material for lithium-ion batteries (LIBs), exhibited high reversible lithium storage capacity and ex...

This paper reports on the development of a micro-potentiometric sensor based on external microelectrodes introduced into a microchip. We miniaturized reference and ion-selective electrodes (ISEs) and embedded them into a plastic (PDMS) microchip; the miniaturization of ISE was attained by using a monolithic capillary-based membrane. This sensor was applied to the detection of alkali ions (Na+, ...

Debye-Waller factors at different t empera tures of four alkali and three noble metals have been computed on the basis of a screened shell phenomenologica l model . T h e theoretical values are compared with existing experimental data . Part icularly for l i th ium and potassium, most recent experimental information has been included. A critical examina t ion of the results reveals a satisfacto...

Electronic structure calculations and experimental data point to soft local vibrations of alkali ions in AOs2O6 (A 1⁄4 K, Rb, Cs). Due to its size the potassium ion experiences an extremely anharmonic and broad potential well. We use ab initio energies and forces to derive the Hamiltonian for the dynamics of K ions and solve the single site problem. r 2006 Published by Elsevier B.V.