determination of terazosin hydrochloride dihydrate (trz) in drug substance and tablets was studied by fluorimetric techniques. the fluorimetric methods are based on: (1) measurement of the native fluorescence of the drug in water at 750 nm after excitation at 330 nm. (2) sensitizing the native fluorescence by formation a binary complex of drug with aqueous uranyl acetate (0.1% w/v) at the same ...

Structures have been refined for 14 single crystals of curite from various localities in the Democratic Republic of Congo, and for one synthetic crystal grown at 220°C using hydrothermal techniques. Single-crystal diffraction data were collected using MoKa X-radiation and a CCD-based detector mounted on a Bruker three-circle diffractometer. The crystals have orthorhombic symmetry, space group P...

Representative models of the different geometries observed for uranyl complexes with fully deprotonated p-R-hexahomotrioxacalix[3]arene (R = tert-Bu, Me) ligands, among which is the rare trigonal geometry, have been investigated using all-electron scalar relativistic density functional theory (DFT). Optimized structures of complexes incorporating triethylammonium (HNEt3+) and 4-methylpiperidini...

The importance of uranyl(V) (UO2+) species associated with environmental and geologic applications is becoming increasingly evident, but the tendency cation to disproportionate in water has prevented isolation stable complexes. Here we demonstrate that presence tridentate complexing dipicolinate (dpa2?), a ligand highly abundant soil, can be stabilized isolated anoxic basic water. Stable comple...

Alkaline synthesis of double co-oligomers 2-propenylphenol and formaldehyde (synthons) was carried out at 92-950C, for 3 hours ratio 1:2.5 mol (their yield are 93% theory)Interaction maleic anhydride with the obtained olygomers 800C in presence 0.5% benzoyl peroxide 10 produced copolymers a three-dimensional cross-linked structure (with 90%). By treating them hot water, sorbent to contain both ...

The complexation of U(vi) at the proteinaceous surface layer (S-layer) of the archaeal strain Sulfolobus acidocaldarius was investigated over a pH range from pH 1.5 to 6 at the molecular scale using time-resolved laser-induced fluorescence spectroscopy (TRLFS) and U L(III)-edge extended X-ray absorption fine structure (EXAFS). The S-layer, which represents the interface between the cell and its...