| Abstract
| - The ligand 4,5-bis(diphenylphosphino)-sym-octahydroacridine N,P,P‘-trioxide (10) was obtained from a multistepsynthesis and characterized by spectroscopic methods, and two crystal forms were examined by single-crystalX-ray diffraction techniques. The coordination behavior of the trifunctional ligand toward La(NO3)3 and Nd(NO3)3 was examined, and the molecular structures of the complexes La(10)(NO3)3·MeOH and Nd(10)(NO3)3·MeOH were determined by single-crystal X-ray diffraction methods. The molecules form chains along the z axisin which the ligand bonds in a bidentate mode to one La(NO3)3 or Nd(NO3)3 by using the N−O and one of thePO donor centers. The second PO donor group in the ligand bridge bonds to a second La(10)(NO3)3 or Nd(10)(NO3)3 unit. The coordination behavior of 10 contrasts with that of the related but structurally more flexibletrifunctional ligand 2,6-bis[(diphenylphosphino)methyl]pyridine N,P,P‘-trioxide, which acts as a tridentate ligandtoward f-element ions.
- A multistep synthesis for the title ligand has been developed, and initial studies of its coordination ability toward La(III) and Nd(III) show that under the conditions explored this ligand forms chain complexes via bidentate coordination to one metal ion and monodentate coordination to a second metal ion. This contrasts with the tridentate coordination mode adopted by the geometrically more flexible 2,6-bis[(diphenylphosphino)methyl]pyridine N,P,P‘-trioxide.
|
