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N′,N′,N″,N″ ‐Tetramethylguanidine‐Substituted Phosphoryl Compounds as Ligands in Transition Metal Chemistry – Unusual Modes of Coordination
Author(s) -
Münchenberg Jochen,
Thönnessen Holger,
Jones Peter G.,
Schmutzler Reinhard
Publication year - 1997
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.19971301219
Subject(s) - chemistry , transition metal , coordination complex , metal , crystallography , ligand (biochemistry) , nuclear magnetic resonance spectroscopy , infrared spectroscopy , nitrogen atom , spectroscopy , chelation , coordination geometry , coordination number , stereochemistry , molecule , inorganic chemistry , ring (chemistry) , hydrogen bond , organic chemistry , catalysis , ion , biochemistry , physics , receptor , quantum mechanics
Methyl‐ and tert ‐butylphosphonic bis( N′,N′,N″,N″ ‐tetramethylguanidinide) 1 and 2 were allowed to react with various transition metal compounds. The resulting complexes were studied by IR spectroscopy, mass spectrometry and, in the case of 10 , by NMR spectroscopy. In the case of the compounds 7–10 the metal was coordinated only via the imino nitrogen atoms of 2 , (IR evidence). X‐ray structure analyses were performed for [L 1 CoBr 2 ] 2 6 , L 2 CuCl 2 9 , and L 2 PdCl 2 10 (L 1 = 1 , L 2 = 2 ). In 5 L 1 acts as an N,O bridging ligand, leading to tetrahedral coordination at Co and eightmembered (‐Co‐O‐P‐N‐) 2 rings. In 6 coordination by L 2 chelates the metal atom through two N atoms, leading to PN 2 M rings; the coordination geometry is distorted planar.