| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
| |
| Motta, Antonella |
| |
| Aletan, Dirar |
| |
| Mohamed, Tarek |
| |
| Ertürk, Emre |
| |
| Taccardi, Nicola |
| |
| Kononenko, Denys |
| |
| Petrov, R. H. | Madrid |
|
| Alshaaer, Mazen | Brussels |
|
| Bih, L. |
| |
| Casati, R. |
| |
| Muller, Hermance |
| |
| Kočí, Jan | Prague |
|
| Šuljagić, Marija |
| |
| Kalteremidou, Kalliopi-Artemi | Brussels |
|
| Azam, Siraj |
| |
| Ospanova, Alyiya |
| |
| Blanpain, Bart |
| |
| Ali, M. A. |
| |
| Popa, V. |
| |
| Rančić, M. |
| |
| Ollier, Nadège |
| |
| Azevedo, Nuno Monteiro |
| |
| Landes, Michael |
| |
| Rignanese, Gian-Marco |
|
Forsyth, Craig M.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (4/4 displayed)
- 2017Synthesis and Structures of Rare Earth 3-(4′-Methylbenzoyl)-propanoate Complexes-New Corrosion Inhibitorscitations
- 2004Reactions of lanthanoid metals with 3,5-diphenylpyrazole at elevated temperaturescitations
- 2000A simple synthesis and a structural survey of homoleptic rare earth(III) 2,6-diphenylphenoIatescitations
- 20002,6-Diphenylphenolates of calcium, strontium and barium exhibiting π-phenyl encapsulation of the partially naked cationscitations
Places of action
| Organizations | Location | People |
|---|
article
Reactions of lanthanoid metals with 3,5-diphenylpyrazole at elevated temperatures
Abstract
<p>The direct reaction of lanthanoid metals with 3,5-diphenylpyrazole (Ph <sub>2</sub>pzH) at 300°C under vacuum in the presence of mercury gives the structurally characterized [Ln<sub>3</sub>(Ph<sub>2</sub>pz)<sub>9</sub>] (Ln = La or Nd), [Ln<sub>2</sub>(Ph<sub>2</sub>pz)<sub>6</sub>] (Ln = Er or Lu). Similar reactions provided heteroleptic [Ln(Ph<sub>2</sub>pz) <sub>3</sub>(Ph<sub>2</sub>pzH)<sub>2</sub>] (Ln = La, Nd, Gd, Tb, Er and Yb). The last was obtained only from impure Ph<sub>2</sub>pzH, but was subsequently prepared by treatment of [Yb(Ph<sub>2</sub>pz)<sub>3</sub>(thf )<sub>2</sub>] with Ph<sub>2</sub>pzH. Reactions of Yb with Ph<sub>2</sub>pzH at 200°C gave a poorly soluble divalent species which was converted by 1,2-dimethoxyethane into [Yb(Ph<sub>2</sub>pz)<sub>2</sub>(dme)<sub>2</sub>]. Single crystal X-ray structures established a bowed trinuclear pyrazolate-bridged structure for [Ln<sub>3</sub>(Ph<sub>2</sub>pz)<sub>9</sub>] (Ln = La or Nd), Ln ⋯ Ln ⋯ Ln being 135.94(1)° (La) and 137.41(1)° (Nd). There are two η<sup>2</sup>-Ph<sub>2</sub>pz ligands on the terminal Ln atoms and one on the central metal with adjacent Ln atoms linked by one μ-η<sup>2</sup>: η<sup>2</sup> and one μ-η<sup>5</sup> (to terminal Ln):η<sup>2</sup> pyrazolate group. Thus the terminal Ln atoms are formally nine-coordinate and the central Ln, ten-coordinate. By contrast, [Ln <sub>2</sub>(Ph<sub>2</sub>pz)<sub>6</sub>] (Ln = Er or Lu) complexes are dimeric with two terminal (η<sup>2</sup>) and two bridging (μ-η<sup>2</sup>:η<sup>2</sup>) pyrazolates and eight-coordinate lanthanoids. All six heteroleptic complexes [Ln(Ph<sub>2</sub>pz) <sub>3</sub>(Ph<sub>2</sub>pzH)<sub>2</sub>] (Ln = La, Nd, Gd, Tb, Er or Yb) are isomorphous with three equatorial η<sub>2</sub>-Ph<sub>2</sub>pz groups, transoid (N-Ln-N 158.18(6)-161.43(9)°) η<sup>1</sup>-pyrazole ligands, and eight-coordinate Ln throughout.</p>