Komplexbildung und extraktion von zinn mit potentiel dreizähnigen dianionischen ligandenComplex formation and liquid-liquid extraction of tin with potentially tridentate dianionic ligands

Pulse polarography was used to study the extraction of tin(IV) from chloride solution with potentially tridentate dianionic ligands under unbuffered conditions. The ligands usually contained enolizable groups or were produced by splitting heterocyclic rings. The most favourable extractant was 2-(2′-hydroxyphenyl)-quinolin-8-ol, which extracted tin in the pH region 2–8; all othe rligands gave good extraction only at pH 6–8. In the organic phase, 1:1 chelates are formed in all cases. The composition of the complexes was also proved by the isolation of the solid compounds. These complexes were characterized by their Mössbauer parameters.     

Hexagonal Si−Ge Class of Semiconducting Alloys Prepared by Using Pressure and Temperature

Multi-anvil and laser-heated diamond anvil methods have been used to subject Ge and Si mixtures to pressures and temperatures of between 12 and 17 GPa and 1500–1800 K, respectively. Synchrotron angle dispersive X-ray diffraction, precession electron diffraction and chemical analysis using electron microscopy, reveal recovery at ambient pressure of hexagonal Ge−Si solid solutions (P6₃/mmc). Taken together, the multi-anvil and diamond anvil results reveal that hexagonal solid solutions can be prepared for all Ge−Si compositions. This hexagonal class of solid solutions constitutes a significant expansion of the bulk Ge−Si solid solution family, and is of interest for optoelectronic applications.