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Sterische Cyclopentadienyl‐Äquivalente in der Chemie der f‐Elemente: Monomere, homoleptische Lanthanid(III)‐tris[ N,N ′‐bis(trimethylsilyl)‐benzamidinate]
Author(s) -
Wedler Michael,
Knösel Friedrich,
Pieper Ursula,
Stalke Dietmar,
Edelmann Frank T.,
Amberger HannsDieter
Publication year - 1992
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19921251003
Subject(s) - chemistry , homoleptic , trimethylsilyl , cyclopentadienyl complex , lanthanide , steric effects , tris , medicinal chemistry , monomer , anhydrous , crystal structure , stereochemistry , crystallography , organic chemistry , metal , catalysis , ion , biochemistry , polymer
Steric Cyclopentadienyl Equivalents in f‐Element Chemistry: Monomeric, Homoleptic Lanthanide(III) Tris[ N,N ′‐bis(trimethylsilyl)benzamidinates] Anhydrous lanthanide trichlorides react with N ‐silylated sodium benzamidinates, Na[4‐RC 6 H 4 C(NSiMe 3 ) 2 ], ( 1a–d ), to give the monomeric, homoleptic lanthanide(III) benzamidinates [4‐RC 6 H 4 C(NSiMe 3 ) 2 ] 3 Ln ( 2–23 , R = H, MeO, CF 3 , Ph). The molecular structure of [4‐MeOC 6 H 4 C(NSiMe 3 ) 2 ] 3 Pr ( 11 ) has been determined by X‐ray diffraction. Absorption and emission measurements reveal that the three benzamidinate ligands produce an unusually large crystal field which is comparable with that of cyclopentadienyl.