78055-31-9Relevant academic research and scientific papers
TRANSITION METAL CHEMISTRY OF OXIME-CONTAINING LIGANDS. XIX. IRON(II), IRON(III) AND NICKEL(II) COMPLEXES OF syn-PHENYL-2-PYRIDYLKETOXIME AND syn-METHYL-2-PYRIDYLKETOXIME
Mohan, Madan,Paramhans, Bhikari Das
, p. 35 - 44 (2007/10/02)
Complexes of syn-phenyl-2-pyridylketoxime (Hppk) and syn-methyl-2-pyridylketoxime (Hmpk): 2 (where M = Fe(II) or Ni(II); HL = Hppk or Hmpk; X(-) = Cl(-), Br(-) or I(-)), (where X(-) = NCS(-) or NCSe(-)); X4 (where X(-) = Cl(-), Br(-), I(-), NO3(-), NCS(-), NCSe(-), AcO(-) or 1/2 SO4(2-)); NO3 and (where X(-) = NCS(-), NCSe(-), AcO(-) or 1/2 SO4(2-)) have been synthesised and characterized by physical methods.X-ray powder diffraction pattern results indicate that , NO3 and complexes are isomorphous and are different from 2 and X4 complexes.The magnetic susceptibilities, measured over the temperature range 300-78 K, are dependent on temperature.The observed temperature dependence of the magnetic moments suggests the presence of a weak antiferromagnetic interaction in 2 and X4 complexes and ferromagnetic interaction in 2 complexes, whereas the data for the remaining complexes are in the range expected for dilute, distorted, octahedral complexes.The magnetic data observed for complexes were used to evaluate the magnitude of the orbital reduction factor, k, the low symmetry distortion parameter, Δ, and the extent of reduction in spin-orbit coupling constant, λ, which suggest the presence of an orbitally non-degenerate, dxy, ground state.Moessbauer spectral results also suggest the presence of a dxy ground state in a distorted octahedral field in iron(II) complexes and square-pyramidal geometry for iron(III) complexes.Infrared spectral data indicate that the ligands Hppk and Hmpk behave as neutral ligands and coordinate through a pyridine nitrogen atom and an oxime group nitrogen atom to the metal(II) and metal(III) ions.The far-infrared spectra suggest a halogen-bridged and a hydroxo-bridged dimeric distorted cis octahedral structure for 2 and X4 complexes and monomeric distorted cis octahedral structure for the remaining complexes.The reflectance spectra of iron(II), iron(III) and nickel(II) complexes are consistent with a distorted octahedral cis coordination geometry.
