Tetrapodal amidoxime ligands I. Coordination isomerism due to self-complementary dimerization of a pyramidal cobalt(III) coordination module.
A bis-μ-amidoximato-bridged cobalt(III) dimer obtained with a new tetrapodal ligand possesses interesting structural parameters as a consequence of intramolecular hydrogen bonding intentionally built into the complex. Its synthesis and properties are described. The new ligand type combines attributes of two previously described ligand classes: It binds a metal ion in a tetrapodal pentadentate fashion and forms a pseudomacrocycle through hydrogen bonds, characteristic of chelating oxime ligands. Coordination isomerism, which is a consequence of dimer formation, has been analyzed by means of X-ray crystallography and carbon-13 nuclear magnetic resonance spectroscopy.
Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 135, 10623, Berlin, Germany.
John P
JP
Boyd
Elisabeth
E
Irran
Andreas
A
Grohmann
D003035:Cobalt / Q000737:chemistry*; D019281:Dimerization; D006860:Hydrogen Bonding; D007536:Isomerism; D008024:Ligands; D009942:Organometallic Compounds / Q000737:chemistry*; D010084:Oxidation-Reduction; D010091:Oximes / Q000737:chemistry*; D011743:Pyrimidines / Q000737:chemistry
D008024:Ligands; D009942:Organometallic Compounds; D010091:Oximes; D011743:Pyrimidines; D003035:Cobalt; C030986:pyrimidine