The reaction of Ln(NO3)3·aq with K 3[Fe(CN)6] or K3[Co(CN)6] and 2,2′-bipyridine in water led to five one-dimensional complexes: trans-[M(CN)4(μ-CN)2Ln(H2O)4 (bpy)]n·XnH2O·1.5nbpy (M = Fe3+ or Co3+; Ln = Sm3+, Gd3+, or Yb3+; X = 4 or 5). The structures for [Fe3+-Sm3+] (1), [Fe 3+-Gd3+] (2), [Fe3+-Yb3+] (3), [Co3+-Gd3+] (4), and [Co3+-Yb3+] (5) have been solved; they crystallize in the triclinic space P1 and are isomorphous. The [Fe3+-Sm3+] complex is a ferrimagnet, its magnetic studies suggesting the onset of weak ferromagnetic 3-D ordering at 3.5 K. The [Fe3+-Gd3+] interaction is weakly antiferromagnetic. The isotropic nature of Gd3+ allowed us to evaluate the exchange interaction (J = 0.77 cm-1).
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry