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Synthesis and Dynamic Behavior of the Dimeric, Monocyclic Barium Bis[bis(isopropyldimethylsilyl)phosphanide] – Molecular Structures of P(SiMe 2 Ph) 3 , of Monomeric (thf) 4 Ba[P(SiMe 2 i Pr) 2 ] 2 and of the Dimer {(thf) 2 Ba[P(SiMe 2 i Pr] 2 ] 2 } 2
Author(s) -
Westerhausen Matthias,
Lang Gerhard,
Schwarz Wolfgang
Publication year - 1996
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.19961290910
Subject(s) - chemistry , tetrahydrofuran , dimer , monomer , barium , toluene , molecule , crystal structure , crystallography , amide , stereochemistry , yield (engineering) , inorganic chemistry , organic chemistry , polymer , materials science , solvent , metallurgy
Barium bis[bis(trimethylsily)amide] metalates bis(isopropyldimethylsilyl)phosphane ( 1 ) to yield nearly quantitatively the corresponding barium bis[bis(isopropyldimethylsilyl)phosphanide] ( 3 ). This compound shows a temperature‐dependent monomer‐dimer equilibrium in toluene solution. Both the isomers were characterized by X‐ray crystal structure analyses. The monomeric derivatives precipitate as a tetrakis(tetrahydrofuran) complex with a P–Ba–P bond angle of 139.9°. The barium atoms of the monocyclic, centrosymmetric dimer are pentacoordinated by two tetrahydrofuran molecules, one terminal and two bridging phosphanide ligands. The endo‐ and exocyclic Ba–P distances with values of 332 and 316 pm, respectively, lie within the characteristic range.