Synthesis, Characterization, and Coordination Chemistry of a New Geometrically Hindered Trifunctional Ligand, 4,5-Bis(diphenylphosphino)-sym-octahydroacridine N,P,P‘-Trioxide

• Published in: Inorganic chemistry Vol. 39; no. 20; pp. 4591 - 4598
• Main Authors: Gan, Xin-Min, Parveen, Sahrah, Smith, Wayne L, Duesler, Eileen N, Paine, Robert T
• Format: Journal Article
• Language: English
• Published: American Chemical Society 02.10.2000
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/ic000153n

The ligand 4,5-bis(diphenylphosphino)-sym-octahydroacridine N,P,P‘-trioxide (10) was obtained from a multistep synthesis and characterized by spectroscopic methods, and two crystal forms were examined by single-crystal X-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 axis in 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 the PO donor centers. The second PO 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 flexible trifunctional ligand 2,6-bis[(diphenylphosphino)methyl]pyridine N,P,P‘-trioxide, which acts as a tridentate ligand toward f-element ions.