The synthesis of a series of C1-symmetric metallocene complexes rac-[1-(5,6-dialkoxy-2-methyl1-η5-indenyl)-2-(9-η5-fluorenyl)ethane]zirconium dichlorides (alkyl: n-butyl, n-hexyl, n-octyl, ndecyl) is described. These complexes are versatile catalysts in the polymerization of propylene after in situ activation with triisobutylaluminum (TIBA) and Ph3C[B(C6F5)4] in toluene and heptane solution. Al...

New Oxovanadium(IV) and zirconium (IV) complexes were synthesized with tridentate ligand and characterized by elemental analysis, molar conductance measurements, molecular weight determinations, IR, electronic, and H NMR studies. The Oxovanadium(IV) complex is non-electrolyte whereas zirconium(IV) complex is 1:2 electrolytes in nature and may be formulated as[(VOL)2SO4] and [ZrL2]Cl2 respective...

chemistry of anion recognition is now being uncovered and producing a variety of practical applications, including separation and sensing. 1–3 The use of Lewis acid-base interactions is a promising approach in this respect. We previously found that zirconium(IV) could be immobilized on a chelating polymer, having an iminodiacetate (IDA) group (–LH2), as a 1:1 complex of [(–L)Zr(OH)2]. 4,5 This ...

Eudialyte-group minerals are of scientific interest as important concentrators rare elements (mainly Zr and REE) in agpaitic alkaline rocks a potential source REE, Zr, Hf, Nb, Ta for industrial use. Extraction uranium(VI), thorium(IV), zirconium(IV), hafnium(IV), titanium(IV), scandium(III) by binary extractant based on 1,5-bis[2-(hydroxyethoxyphosphoryl)-4-ethylphenoxy]-3-oxapentane methyl tri...

A new catalytic kinetic spectrophotometric procedure for determination of trace quantities of zirconium was proposed. Janus Green was oxidized by potassium bromate and zirconium catalyst which then converted to a colorless product in acidic media. Reaction rate was monitored spectrophotometrically at 606 nm. It relies on the linear relationship between the absorbance difference (ΔAt) and Zr(IV)...

To label proteins with positron emitters with a half-life in the order of days, a method has been developed to label proteins with zirconium (Zr)-isotopes. Therefore, the bifunctional chelating agent desferal (Df) was coupled to albumins via a thioether bond. Labeling of the premodified proteins was easily performed by addition of these proteins to freeze-dried Zr-oxalate. This labeling was eff...

Zirconium oxynitride (Zr(O)N) and Copper-Zirconium oxynitrides (Cu-Zr(O)N) were deposited by a DC reactive magnetron sputtering technique on stainless steel substrates. A duty cycle controller was used to obtain different oxygen contents in the developed films chemical activation procedure carried out copper oxides. The samples structurally characterized SEM, EDS, XRD XPS. Additional functional...

The purpose of the present study was to evaluate the effect of cooling rates after firing procedures of veneering porcelain on shear bond strength between veneering porcelain and a zirconium dioxide (zirconia; ZrO₂) ceramic material. A total of 48 ZrO₂ disks were divided equally into three groups. Two veneering porcelains that are recommended for ZrO₂ material - Cerabien ZR (CZR), IPS e.max Cer...

Removal of uranium [U(VI)] from aqueous solutions with humic acid-immobilized zirconium-pillared clay (HA-Zr-PILC) was investigated using a batch adsorption technique. The adsorbent was characterized using XRD, FTIR, SEM, TG/DTG, surface area analyzer and potentiometric titration. The effects of pH, contact time, initial concentration, adsorbent dose, and adsorption isotherm on the removal proc...

Zirconium (Zr) alloy is a promising fuel cladding material used widely in nuclear reactors. Usually, it service for long time under the effects of neutron radiation with high temperature and pressure, which results thermomechanical coupling behavior during process. Focusing on UO2/Zr elements, macroscopic responses pure Zr, Zr-Sn, Zr-Nb binary system alloys, as well Zr-Sn-Nb ternary materials, ...