134296-08-5Relevant articles and documents
Coordination of Hydrazone Derivatives of 2,2'-Bipyridine-6-carbaldehyde. Electronic and Structural Aspects of the Iron(II), Cobalt(II) and Nickel(II) Complexes
Onggo, Djulia,Craig, Donald C.,Rae, David A.,Goodwin, Harold A.
, p. 331 - 341 (2007/10/02)
Iron(II), cobalt(II) and nickel(II) 2+ type complexes of the tridentate termine ligands 2,2'-bipyridine-6-carbaldehyde phenylhydrazone (bph) and 2,2'-bipyridine-6-carbaldehyde 2-pyridylhydrazone (bpyh) have been prepared.The electronic spectrum of the 2+ species indicates that the field strength of these ligands is near that the iron(II) singlet/quintet crossover.Magnetic and Moessbauer spectral data reveal that salts of 2+ are essentially low spin, while those of 2+ are high spin.Salts of 2+ have strongly temperature-dependent magnetic moments which indicate a thermally induced doubletquartet spin transition in the metal atom.The structure of 2 reveals meridional coordination of the tridenate units, the azomethine nitrogen of the hydrazone moiety being bound to the metal atom.There is significant twisting (83deg) of the two pyridyl rings in each ligand molecule about the interring bridge.The 2+ fragment is tetragonally compressed and the mean Ni-N distance is 20.9 Angstroem. 2 is monoclinic, space group C2/c, Z = 4, a 23949(3), b 7868(1), c 21303(3) Angstroem, β 11795(2)deg.