Reaktionen von LiNPPh3 mit den Cyclooctatetraenid-Komplexen [Ln(C8H8)Cl(THF)2]2 von Cer und Samarium. Die Kristallstrukturen von [LiNPPh3]6, [Ln(C8H8)Li3Cl2(NPPh3)2(THF)3] (Ln = Ce, Sm) und [Li(THF)4][Sm(C8H8)2]

✍ Scribed by S. Anfang; G. Seybert; K. Harms; G. Geiseler; W. Massa; K. Dehnicke

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: German
• Weight: 158 KB
• Volume: 624
• Category: Article
• ISSN: 0372-7874
• DOI: 10.1002/(sici)1521-3749(199807)624:7<1187::aid-zaac1187>3.0.co;2-1

✦ Synopsis

LiNPPh 3 reacts with the cyclooctatetraenide complexes [Ln(C 8 H 8 )Cl(THF) 2 ] 2 of cerium and samarium in tetrahydrofuran solution forming the phosphorane iminato complexes [Ln(C 8 H 8 )Li 3 Cl 2 (NPPh 3 ) 2 (THF) 3 ]. According to crystal structure analyses these complexes show heterocubane structures under participation of the lanthanoid metal atom, of the three Li atoms as well as of the two Cl und the two N atoms of the NPPh 3 ± groups. The crystal structure of LiNPPh 3 shows hexameric molecules with a Li 6 N 6 polyhe-dron which is peripherally shielded by the phenyl groups. The structure of [Li(THF) 4 ][Sm(C 8 H 8 ) 2 ], which has been isolated as a by-product, contains the samarium atom in a sandwichlike coordination by the two g 8 -C 8 H 8 2± rings as it is also known from the corresponding anions with cerium and neodymium.