The two potentially tridentate and monoprotic Schiff bases acetylpyridine benzoylhydrazone (HL(1)) and acetylpyridine 4-tert-butylbenzoylhydrazone (HL(2)) demonstrate remarkable coordination versatility towards iron on account of their propensity to undergo tautomeric transformations as imposed by the metal centre. Each of the pyridyl aroylhydrazone ligands complexes with the ferrous or ferric ...

The kinetics of the reaction of L-aspartic acid (H3L +) with hydroxopentaaquarhodium (Ill) has been studied over the range 2.58:510[H3L 1 :5 12.90, 3.49 5.pH:5 4.3, 50°:5 t :565°C and 1=O.lmol dm-(NaCI04).The reaction takes place via an outer sphere association between RhOH+ and (H3L +) followed by transformation of the outer into an inner-sphere complex (chelate is formed) by slow interchange....

The absolute configuration of the octa-hedral fac-CoN(3)O(3) title complex, [Co(C(5)H(8)NO(2))(3)]·3H(2)O, has been determined by single-crystal X-ray analysis. A three-dimensional network of hydrogen bonds is observed between the proline carboxyl-ate groups and the three uncoordinated water mol-ecules.

Recently announced results from the Sudbury Neutrino Observatory (SNO) [1] and KamLAND [2] experiments indicate that neutrino physics is moving from the discovery stage to the precision measurements stage. (For recent reviews see e. g. [3,4]). A combined analysis of the data from these experiments as well as data from other solar neutrino experiments (Super-Kamiokande [SK] [5], Chlorine [6], an...

Hydroponic experiments were performed to exam the dynamic change of endogenous proline in rice seedlings exposed to potassium chromate chromium (VI) or chromium nitrate chromium (III). Although accumulation of both chromium species in rice seedlings was obvious, more chromium was detected in plant tissues of rice seedlings exposed to chromium (III) than those in chromium (VI), majority being in...

The toxicity of As(V) and As(III) to two axenic tropical freshwater microalgae, Chlorella sp. and Monoraphidium arcuatum, was determined using 72-h growth rate-inhibition bioassays. Both organisms were tolerant to As(III) (72-h concentration to cause 50% inhibition of growth rate [IC50], of 25 and 15 mg As[III]/L, respectively). Chlorella sp. also was tolerant to As(V) with no effect on growth ...

Toxic effects due to high aluminum body loads were observed in a number of conditions following ingestion of Al-containing antacids. Bio-availability of aluminum depends not only on the solubility of the ingested salt but also on the physico-chemical properties of the soluble Al complexes formed in body fluids. Amino acids may, upon interaction with Al-salts, form absorbable Al-complexes. Hence...

Batch experiments were conducted in order to investigate the competitive interaction of arsenite (As(III)) and arsenate (As(V)) onto ferrihydrite as a function of initial pH, adsorbent dosage, concentration of coexisting ligands, and order of addition. The pH generally had a great impact on adsorption under both single ion and competitive conditions. However, the amount of As(V) in solution was...