Synthesis and Raman Spectra of [Nd(XeF2)n](AsF6)3 (n=3, 2.5) and Crystal Structure of [Nd(XeF2)2.5](AsF6)3

✍ Scribed by M. Tramšek; E. Lork; R. Mews; B. Žemva

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 451 KB
• Volume: 162
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2001.9280

✦ Synopsis

The reaction between Nd(AsF 6 ) 3(solv) and excess of XeF 2(solv) in anhydrous HF (aHF) yields compounds of the type [Nd(XeF 2 ) n ] (AsF 6 ) 3 (n ‫؍‬ 3, 2.5). The 5rst compound is very soluble in aHF while the latter crystallizes from the saturated solution in aHF. Pink needles [Nd(XeF 2 ) 2.5 ] (AsF 6 ) 3 crystallize in the space group C2/m with a ‫؍‬ 3463.7(8) pm, b ‫؍‬ 586.3(2) pm, c ‫؍‬ 1010.7(2) pm, ‫؍‬ 103.53(2)3, V ‫؍‬ 1.9955(9) nm 3 , Z ‫؍‬ 4, R 1 ‫؍‬ 0.0379, wR 2 ‫؍‬ 0.0910, 5341 re6ections collected, 2318 independent re6ections. The Nd center is coordinated by a tricapped trigonal prism of nine 6uorine atoms. The rectangular faces are capped by three coordinated XeF 2 molecules. The regular trigonal prisms are formed by six di4erent edge-bridging AsF 6 octahedra, connecting the Nd centers to in5nite chains. Two of such chains are interconnected by one of the XeF 2 molecules forming a double chain.