Environmental remediation requires ion-selective polymers that operate under a wide range of solution conditions. In one example, removal of trivalent and divalent metal ions from waste streams resulting from mining operations before they enter the environment requires treatment at acidic pH. The monoethyl ester phosphate ligands developed in this report operate from acidic solutions. They have...

We present a 2D lattice model of water to study the effects of ion hydration on the properties of water. We map the water molecules as lattice particles consisting of a single Oxygen at the center of a site and two Hydrogen atoms on each side. The internal state of the system, such as the dipole moment at a site, is defined with respect to the location of the Hydrogen atoms at the site dependin...

The effects of hydrogen ion concentration on plant growth occupy a prominient position in discussions of the adaptability of plants to their nutrient eiivironmelit. In the last two decades, with the improvements of methods of measurinig pH and particularly with the widespread adoption of the (lass eleetrode, increasing attention has been given to the hydrogen ion coneenitrationi in soils as it ...

The concentrations of malate, calcium ions, hydrogen ions, and chloride ions were measured in secretions coliected hetween June 1991 and May 1992 from the secretor\ trichomes of chickpea (Cicer arietinum L.|. The average maiate cisncentration was 114 mM and \ aried from 2 to 2K7 mM. the average chloride ion concentration «as 177 mM and varied trom 68 to 355 mM, and the average calcium ion conce...

background and aim: 2,4-dichlorophenol (dcp) is a compound  generated in a variety of industrial processes and also by chlorine disinfection of water polluted with phenolic compounds . dumping of dcp into the environment and water resources is of great concern because of the compound's intense odor and toxicity. dcp is very soluble and resistant to biodegradability so it cannot be removed ...

Sputtering of condensed-phase ammoniumnitrate yields an extensivedistribution of negative cluster ions of the form [(NH4N03),N03]-, n 2 3. Collision-induced dissociation of mass-selected cluster ions suggests that the first two members of the series, n = 1 and n = 2, are missing because the ions rearrange to lose one or more ammonia molecules. Gradient-corrected density-functional calculations ...

The excited-state hydride release from 10-methyl-9-phenyl-9,10-dihydroacridine (PhAcrH) was investigated using steady-state and time-resolved UV/vis absorption spectroscopy. Upon excitation, PhAcrH is oxidized to the corresponding iminium ion (PhAcr(+)), while the solvent (acetonitrile/water mixture) is reduced (52% of PhAcr(+) and 2.5% of hydrogen is formed). The hydride release occurs from th...

In the title compound, [AgCl(C7H7N3O2S)(C18H15P)2], the AgI ion is in a distorted tetra-hedral coordination environment formed by P atoms from two tri-phenyl-phosphane ligands, one terminal S atom from the 1-(4-nitro-phen-yl)thio-urea ligand and a chloride ion. In the crystal, bifurcated (N-H)2⋯Cl hydrogen bonds [with graph-set motif R21(6)] connect complex mol-ecules, forming zigzag chains alo...

In the title complex, [Ag(NO3)(C2H3N3S)(C18H15P)2]·CH3OH, the Ag(I) ion exhibits a distorted tetra-hedral coordination geometry formed by two P atoms from two tri-phenyl-phosphine ligands, one S atom from a 1H-1,2,4-triazole-5(4H)-thione ligand and one O atom from a nitrate ion. In the crystal, complex and solvent mol-ecules are linked by O-H⋯O and N-H⋯O hydrogen bonds forming a chain along the...