201607-59-2Relevant academic research and scientific papers
Coordination chemistry of mixed pyridine-phenol ligands ; mononuclear palladium(II) and dinuclear copper(II) complexes of derivatives of bidentate N,O-chelating ligands based on 2-(2-hydroxyphenyl)pyridine
Otter, Carl A.,Bardwell, David A.,Couchman, Samantha M.,Jeffery, John C.,Maher, John P.,Ward, Michael D.
, p. 211 - 220 (1998)
The new ligands 2-(2-hydroxyphenyl)-4-tbutyl-pyridine (HL1), 2-(2-hydroxyphenyl)-6-methyl-pyridine (HL2) and 2-(2-hydroxyphenyl)-6-[(2-phenyl)ethyl]pyridine (HL3) were prepared. They are all substituted derivatives of the simple N,0-bidentate chelating ligand 2-(2-hydroxyphenyl)pyridine. HL1 is solubilised derivative bearing a tBu substituent in a position which will not sterically interfere with metal-ion coordination ; HL2 and HL3 contain substituents at C6 of the pyridyl ring, adjacent to the N atom, which will therefore sterically hinder metal-ion coordination. The complexes [PdL2] (L = L1, L2 and L3) were prepared and structurally characterised to determine the effects (if any) of the substituents on the structures of the metal complexes. All are four-coordinate complexes with square planar coordination geometry about the Pd(II) ion, but the sterically hindered ligands L2 and L3 have to adopt a different conformation from L1 to allow planar coordination, resulting in bowl-like structures. [Cu2(L1)4] was also prepared and found to be a phenolatebridged dinuclear complex in the solid state, both by X-ray crystallography and EPR measurements. In solution, however, it dissociates to give [Cu(L1)2] monomeric units. Cu(II) complexes of L2 and L3 could not be isolated.
