N′,N′,N″,N″‐Tetramethylguanidine‐Substituted Phosphoryl Compounds as Ligands in Transition Metal Chemistry – Unusual Modes of Coordination

Abstract

AbstractMethyl‐ 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 [L1CoBr2]2 6, L2CuCl2 9, and L2PdCl2 10 (L1 = 1, L2 = 2). In 5 L1 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 L2 chelates the metal atom through two N atoms, leading to PN2M rings; the coordination geometry is distorted planar.