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Projects / Programmes source: ARIS

Rare earth elements: donor and acceptor properties of binary fluorides

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Research activity

Code Science Field Subfield
1.04.03  Natural sciences and mathematics  Chemistry  Inorganic chemistry 

Code Science Field
P360  Natural sciences and mathematics  Inorganic chemistry 
Keywords
Rare-earth elements, lanthanoids, binary fluorides, hexafluroarsenates, oxonium compounds, reactions in superacids, structures
Evaluation (rules)
source: COBISS
Evaluation of bibliographic research performance indicators according to ARIS methodology
Citations Citations for bibliographic records in COBIB.SI that are linked to records in citation databases
source: WoS source: Scopus source: COBISS
Researchers (10)
no. Code Name and surname Research area Role Period No. of publications
1.  10749  PhD Marko Gerbec  Chemistry  Researcher  1997 - 1999  248 
2.  11278  PhD Robert Kocjančič  Chemistry  Researcher  1997 - 1999  95 
3.  05131  PhD Karel Lutar  Chemistry  Head  1997 - 1999  134 
4.  01064  Milenko Milojevič  Chemistry  Researcher  1997 - 1999  17 
5.  15732  Robert Moravec    Researcher  1997 - 1999  9 
6.  01062  MSc Tomaž Ogrin  Chemistry  Researcher  1998 - 1999  100 
7.  02757  PhD Tomaž Skapin  Chemistry  Researcher  1997 - 1999  120 
8.  17109  Marija Toplak    Researcher  1999  3 
9.  15733  Mira Zupančič    Researcher  1997 - 1999  6 
10.  01063  PhD Boris Žemva  Chemistry  Researcher  1997 - 1999  603 
Organisations (1)
no. Code Research organisation City Registration number No. of publications
1.  0106  Jožef Stefan Institute  Ljubljana  5051606000  91,576 
Abstract
The unique specific properties of lanthanoids are to large extent responsible for the progress in many areas of science and technology. Lanthanoid binary fluorides are among key substances of these metals, therefore are among the best characterized, and their chemistry offer different challanges. In the investigation of amphoteric properties of lanthanoid binary fluorides new synthesis approaches will be introduced. Emphasis will be given on reactions in superacid anhydrous hydrogen fluoride which acidity or basicity will be controlled by addition of Lewis acids or bases. During the first two years of the project some new types of lanthanoid (Ln = La-Lu, Y) compounds were synthesized, LnFx(AsF6)3-x (x = 0, 1 or 1.5), and LnFx(BF4)3-x (x = 1 or 2). These compositions are nicely in accordance with decreasing basicity of LnF3 along the series. Crystallization and stabilization of these compounds was achieved with some fluoro acids or bases as an additional ligands and following compounds were obtained, La(HF)2(AsF6)3, La(CH3CN)9(AsF6)3 and Ce(AsF3)3(AsF6)3. The structure of La(HF)2(AsF6)3 reveals a novel type of bonding interactions as HF molecules are connected directly to the metal center. The whole new family of oxonium compounds, (H3O)xLnyFz(AsF6)x+3y-z was synthesized. These compounds represent precursors for new coordination and organometallic chemistry of lanthanoids. It is expected that structures of some new lanthanoid in complex compounds will govern interesting physical properties.
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