Synthese, Kristallstruktur und Magnetismus von [(CH3)2NH2][PrCl4(H2O)2]

✍ Scribed by Annette Becker; Werner Urland

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: German
• Weight: 147 KB
• Volume: 625
• Category: Article
• ISSN: 0372-7874
• DOI: 10.1002/(sici)1521-3749(199906)625:6<1033::aid-zaac1033>3.0.co;2-4

✦ Synopsis

Inhaltsu È bersicht. Das komplexe wasserhaltige Chlorid [(CH 3 ) 2 NH 2 ][PrCl 4 (H 2 O) 2 ] wurde erstmals dargestellt und die Kristallstruktur anhand von Einkristalldaten bestimmt. Die Verbindung kristallisiert orthorhombisch in der Raumgruppe Cmca (Z = 8) mit a = 1796,6(2) pm, b = 940,7(1) pm und c = 1238,4(2) pm. Die Anionenteilstruktur wird gema Èû [PrCl 4/2 Cl 2 (H 2 O) 2 ] ± von Ketten kantenverknu È pfter Trigon-dodekaeder [PrCl 6 (H 2 O) 2 ] 3± aufgebaut, die von Dimethylammoniumkationen ([(CH 3 ) 2 NH 2 ] + ) zusammengehalten werden. Um die Wechselwirkungen des Praseodymkations (Pr 3+ ) mit seinen Liganden zu untersuchen, wurden magnetische Messungen durchgefu È hrt. Die Interpretation erfolgte mittels ligandenfeldtheoretischer Berechnungen unter Anwendung des Angular-Overlap-Modells. Preparation, Crystal Structure, and Magnetism of [(CH 3 ) 2 NH 2 ][PrCl 4 (H 2 O) 2 ] Abstract. The complex water containing chloride [(CH 3 ) 2 NH 2 ][PrCl 4 (H 2 O) 2 ] has been prepared for the first time and the crystal structure has been determined from single crystal X-ray diffraction data. The compound crystallizes orthorhombically in the space group Cmca (Z = 8) with a = 1796.6(2) pm, b = 940.7(1) pm, and c = 1238.4(2) pm. The anionic part of the structure is built up by chains of edgeconnected trigondodecahedra [PrCl 6 (H 2 O) 2 ] 3± according to [PrCl 4/2 Cl 2 (H 2 O) 2 ] ± , which are held together by dimethylam-monium cations ([(CH 3 ) 2 NH 2 ] +

). In order to study the interactions between the praseodymium cation (Pr 3+ ) and the ligands magnetic measurements were carried out. The magnetic data were interpreted by ligand field calculations applying the angular overlap model.