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Hypercoordinate Silicon Complexes of (O,N,N′ vs. O,N,O′) Schiff Base Type N ‐(2‐Carbamidophenyl)imines: Examples of Exclusively O ‐Silylated Carbamides
Author(s) -
Kämpfe Alexander,
Kroke Edwin,
Wagler Jörg
Publication year - 2009
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200801176
Subject(s) - chemistry , imine , silicon , stereochemistry , coordination complex , schiff base , coordination sphere , crystallography , organic chemistry , metal , crystal structure , catalysis
Tridentate salphen‐type O,N,N′ chelators, upon acylation of the NH 2 group, are capable of engaging an O,N,O′ coordination mode in addition to their inherent O,N,N′ donor character. In six‐coordinate silicon complexes of the type SiL 2 [L = N ‐(2‐ c arbamidophenyl)imine], these ligands were found to exclusively form SiN 2 O 4 coordination spheres by engaging their tridentate O,N,O′ donor capability. Selected ligands L were also shown to preferably engage the O,N,O′ coordination mode when incorporated in five‐ and four‐coordinate silicon compounds of the type LSiPhX (X = Cl, F) and LSiPh 2 , respectively. The coordination modes of the herein presented six‐, five‐, and four‐coordinate silicon compounds represent the first examples of X‐ray structurally confirmed O ‐silylated carbamides, which hence adopt structural features of C‐siloxyimines.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)