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Kristallstrukturen der Samarium-Amido-Komplexe [Sm(l-X){N(SiMe3)2}2(THF)]2 mit X = Cl, Br

✍ Scribed by M. Karl; G. Seybert; W. Massa; S. Agarwal; A. Greiner; K. Dehnicke

Publisher: John Wiley and Sons
Year: 1999
Tongue: German
Weight: 92 KB
Volume: 625
Category: Article
ISSN: 0372-7874
DOI: 10.1002/(sici)1521-3749(199909)625:9<1405::aid-zaac1405>3.0.co;2-5

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✦ Synopsis

The crystal structures of the title compounds have been determined by X-ray methods. [Sm(l-Cl) {N(SiMe 3 ) 2 } 2 (THF)] 2 (1): Space group P2 1 /n, Z = 2, lattice dimensions at 223 K: a = 1429.5(2), b = 1302.3(3), c = 1658.6(3) pm, b = 114.212(10)°, R = 0.0561. [Sm(l-Br) {N(SiMe 3 ) 2 } 2 (THF)] 2 (2): Space group Pbca, Z = 4, lattice dimensions at 223 K: a = 1850.0(7), b = 1611.0(9), c = 1888.1(6) pm, R = 0.0497.

1 and 2 form centrosymmetric dimeric complexes via l-Xhalogeno bridges. The samarium atoms are coordinated in a distorted trigonal-bipyramidal surrounding, the THF molecule and one of the bridging halogen atoms being in axial positions.

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