Silver(II) Complexes of Hindered N-Heterocyclic Ligands: Electron Spin Resonance of Nitrato(6,6 < sup > / < /sup > -dimethyl-2,2' -bipyridine)silver(II) and Nitrato(2,9-dimethyl-1,10-phenanthroline)silver(II) Ions

Abstract

AgLNO3complexes, with L = 6,6’-dimethyl-2,2/-bipyridine (dmbp) and 2,9-dimethyl-1,10-phenanthroline (dmp), have been prepared and oxidized by peroxodisulfate to give silver(II) complex ions that have been isolated as the magnetically dilute salts [AgLNO3]PF6NH4PF6. The small g anisotropy combined with the relatively small14N hyperfine splittings in AgLN03+indicate extensive deloealization involving the nitrate ion. The ESR parameters and electronic transition energies are used to evaluate the bonding parameters in these and other silver(II) complexes of N-heterocyclic ligands. The redox stabilities of silver and copper complexes of hindered N-heterocycles are compared. © 1989, American Chemical Society. All rights reserved.