Spectroscopic results on the infrared emission properties of trivalent holmium (Ho3+) doped potassium lanthanum chloride (K2LaCl5) are presented. Using ~900 nm excitation, Ho3+ doped K2LaCl5, which has a maximum phonon energy of 235 cm−1, exhibited the infrared emissions at ~1660, ~1995, and ~39...

The aim of this study was the development of radioactive holmium phosphate microspheres (HoPO4-MS) with a high holmium content and that are stable in human serum for selective internal radiation therapy (SIRT) of liver cancer. To this end, holmium acetylacetonate microspheres (HoAcAc-MS) were pr...

BackgroundThe existence of saccharide-holmium complexes, containing mono or polysaccharide molecules, is an attractive hypothesis toward a radiation therapy (RT) with beta-emitters targeting high glucose metabolic human sites. To exam such hypothesis, the aim of this study was to investigate the...

The widespread use of phthalates is of major concern as they have adverse effects on many different physiological functions, including reproduction, metabolism and cell differentiation. The aim of this study was to compare the toxicity of the widely-used di (2-ethydlhexyl) phthalate (DEHP) with ...

Glycosidases are very important enzymes involved in a variety of biochemical processes with a special importance to biotechnology, food industry, and pharmacology. Novel structurally simple inhibitors derived from cyclohexane-1,2-dicarboxylic acids were synthesized and tested against several fun...

This work presents an electrochemical study of Er3+ and Al3+ in the LiCl-KCl-AlCl3-Er2O3 melts at 773 K. Gibbs energy calculation shows that AlCl3 can favorably chloridize Er2O3 and release Er3+ ions under this condition. Cyclic voltammetry, square wave voltammetry, chronopotentiometry and open-...

Novel 8-hydroxyquinoline-terminated hyperbranched polyesters (1-HBPQ and 2-HBPQ) were synthesized and characterized by 1H-NMR and UV-Vis analyses. Then, two erbium complexes (1-HBPQ-Er3+-HQ and 2-HBPQ-Er3+-HQ) were prepared by using 1-HBPQ or 2-HBPQ as the macromolecular ligand and 8-hydroxyquin...

N, N-dibutyldiglycol amic acid (HLI) and N, N-dioctyldiglycol amic acid (HLII) were synthesized and characterized by conventional spectroscopic methods. These molecules were examined as extractants for extraction-separation of La(III), Eu(III) and Er(III), as representative ions of light, middle...

The reaction of erbium(iii) carbonate with thenoyltrifluoroacetone in ethanol leads to the formation of hydrate hydroxonium tetrakis(thenoyltrifluoroacetonato)erbate(iii) (H3O)+[Er(tta)4]– H2O, whose molecular structure has been determined by X-ray analysis.

For the first time a highly sensitive and selective fluorimetric optode membrane was prepared for the determination of trace amounts of Er(III) ions. The Er(III) sensing system was constructed by incorporating 5-(dimethylamino) naphthalene-1-sulfonyl-4-phenylsemicarbazide (L) as a neutral Er(III...

A membrane optode formed by physical inclusion of a chromophore 2-amino-6-(1,3-thiazol-2yldiazenyl)phenol (ATDP) into a plasticized cellulose triacetate (CTA) matrix was investigated for preconcentration, extraction and colorimetric determination of Er(III) from aqueous samples. The optode was e...

The electrochemical behaviour of Er(III) was studied on W and Cu electrodes in LiCl-KCl melts by a series of electrochemical techniques. The studies indicated that Er(III) ions were reduced to Er(0) in a one-step diffusion-controlled process exchanging three electrons. The diffusion coefficient ...

The speciation of erbium in chloride-bearing solutions was investigated spectrophotometrically at temperatures of 100 to 250 °C and a pressure of 100 bars. The hydrated ion, Er3+, is predominant at ambient temperature, but chloride complexes are dominant at elevated temperature. Formation const...

A sensitive and selective spectrophotometric method was studied for the determination of erbium (Er) with kojic acid dye (koj) and cetylpyridinium chloride (CPC) as a cationic surfactant from Egyptian monazite and xenotime concentrates using third derivative spectrophotometry. The calibration cu...

A cerium(III) complex, [Ce2(NA)6(H2O)4] (1) and an erbium(III) complex, [Er2(2-AMB)6(H2O)4]·3H2O (2), where NA = nicotinic acid and 2-AMB = 2-aminobenzoic acid, have been prepared and characterized by IR spectroscopy, thermogravimetric analysis and X-ray crystallography. The single crystal anal...

Sodium dithionite initiated free-radical addition of polyfluoroalkyl iodides (2m–2s) with norbornene 1a and its derivatives, such as norbornene-2-carboxylates 1b and 1c, and norbornene-2-carboxylic acids 1d and 1e was investigated. In all the cases, the addition of RF group was stereoselectivel...

Fluorination should impart greater thermal-oxidative stability to the versatile norbonenyl system. Anti-7-Fluoronadic and 7,7-difluoro nadic acid esters (5-norbornenyl-2-endo,3-endo-acid esters) 5c and 5d were synthesized as precursors for a variety of uses including the manufacture of high temp...

The enantiomers (1R, 2R, 3S, 4S, 5S, 6S) and (1S, 2S, 3R, 4R, 5R, 6R) of the 2-exo-cyano-6-endo-hydroxy-5-exo-iodo-3-exo-phenylbicyclo[2.2.1]heptane-2-endo-carboxylic acid lactone 4 and 5, obtained starting from the endo-cycloadducts of the asymmetric Diels-Alder reactions between cyclopentadien...

A key chiral intermediate S(−)-4-chloro-3-hydroxybutanoic acid, methyl ester 2 was made in high optical purity by the stereoselective reduction of 4-chloro-3-oxobutanoic acid methyl ester 1 by cell suspensions of Geotrichum candidum SC 5469. A reaction yield of 95% and optical purity of 96% was ...

sThe present work describes the preparation of new chitosan complex with 4-(ethoxycarbonyl) phenyl-1-amino-oxobutanoic acid (ETHA), as a matrix for silver nanoparticles to obtain a nanocomposite film by solution casing method. The characterization of the prepared nanocomposite film was made by F...