| 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 |
|
Wolflehner, Tobias
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (1/1 displayed)
Places of action
| Organizations | Location | People |
|---|
article
The calcium oxidotellurates Ca2(TeIVTeVIO7), Ca2(TeIVO3)Cl2 and Ca5(TeIVO3)4Cl2 obtained from salt melts
Abstract
<jats:title>Abstract</jats:title><jats:p>The mixed-valent calcium oxidotellurate(IV,VI) Ca<jats:sub>2</jats:sub>(Te<jats:sub>2</jats:sub>O<jats:sub>7</jats:sub>) (= Ca<jats:sub>2</jats:sub>(Te<jats:sup>IV</jats:sup>Te<jats:sup>VI</jats:sup>O<jats:sub>7</jats:sub>)) and the two calcium oxidotellurate(IV) dichlorides Ca<jats:sub>2</jats:sub>(Te<jats:sup>IV</jats:sup>O<jats:sub>3</jats:sub>)Cl<jats:sub>2</jats:sub> and Ca<jats:sub>5</jats:sub>(Te<jats:sup>IV</jats:sup>O<jats:sub>3</jats:sub>)<jats:sub>4</jats:sub>Cl<jats:sub>2</jats:sub> were obtained from metal chloride salt melts. Structure determination from single crystal X-ray data revealed a unique crystal structure in each case. A common motif in the three crystal structures is the formation of a framework perforated by channels into which the stereochemically active 5<jats:italic>s</jats:italic><jats:sup>2</jats:sup> electron lone pairs <jats:italic>E</jats:italic> of the Te<jats:sup>IV</jats:sup> atoms are directed. Ca<jats:sub>2</jats:sub>(Te<jats:sub>2</jats:sub>O<jats:sub>7</jats:sub>) belongs to category I of the Robin-Day classification of mixed-valent compounds. Its crystal structure features a double chain of condensed trigonal-pyramidal [Te<jats:sup>IV</jats:sup>O<jats:sub>3</jats:sub>] and octahedral [Te<jats:sup>VI</jats:sup>O<jats:sub>6</jats:sub>] units embedded within a framework of [CaO<jats:sub><jats:italic>x</jats:italic></jats:sub>] polyhedra (<jats:italic>x</jats:italic> = 7–8). The Cl atoms in the crystal structures of Ca<jats:sub>2</jats:sub>(Te<jats:sup>IV</jats:sup>O<jats:sub>3</jats:sub>)Cl<jats:sub>2</jats:sub> and Ca<jats:sub>5</jats:sub>(Te<jats:sup>IV</jats:sup>O<jats:sub>3</jats:sub>)<jats:sub>4</jats:sub>Cl<jats:sub>2</jats:sub> act as spacers between isolated trigonal-pyramidal [TeO<jats:sub>3</jats:sub>] units and exhibit weak interactions with the 5<jats:italic>s</jats:italic><jats:sup>2</jats:sup> electron lone pairs <jats:italic>E</jats:italic>, with Cl⋯<jats:italic>E</jats:italic> distances <3.6 Å.</jats:p>