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Ein ungewöhnliches biphenylsubstituiertes Lithiumchlorotriarylsamarat
Author(s) -
Niemeyer Mark
Publication year - 2005
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200500015
Subject(s) - agostic interaction , chemistry , lithium (medication) , trigonal bipyramidal molecular geometry , crystallography , aryl , samarium , biphenyl , ligand (biochemistry) , molecule , yield (engineering) , medicinal chemistry , atom (system on chip) , stereochemistry , alkyl , inorganic chemistry , crystal structure , materials science , organic chemistry , metal , medicine , biochemistry , receptor , metallurgy , endocrinology , computer science , embedded system
An Unusual Biphenylsubstituted Lithiumchlorotriarylsamarate The reaction of the lithium biphenyl LiPmph (Pmph = 2′,3′,4′,5′,6′‐pentamethylbiphenyl) with samarium trichloride in a molar ratio of 3 to 1 affords under elimination of only 2 equivalents lithium chloride the lithium samarate [(thf) 3 Li][ClSm(Pmph) 3 (thf)] in a yield of 45°. In the obtained contact ion pair the samarium atom shows an only slightly distorted trigonal bipyramid coordination. Equatorial and axial positions are occupied by three propeller like arranged biphenyl substituents, the Cl{···Li(thf) 3 } ligand, and a THF molecule, respectively. A rather unusual folding of the aryl ligands leads to comparably short distances of the Sm atom to the ortho ‐C–H‐bonds and therefore to the formation of strong agostic interactions.