title: Synthesis and spectroscopic investigations of iron(III) complexes with chlorides and dianionic, symmetrically halogen substituted phthalocyanines as ligands.
abstract: The synthesis of iron(III) complexes of general formula FeCl(R-pc), where R-pc are dianionic, symmetrically halogen substituted phthalocyanines at the positions 2,9,16,23 or 1,8,15,22, from the corresponding amino substituted derivatives is described (R=Cl, Br, I). The complexes are characterized by UV-visible and infrared spectra, powder X-ray diffraction and magnetic susceptibility measurements. The effect of substituents at the periphery and the basicity of the solvents used on the electronic spectra are discussed. The Q band of the electronic spectra for symmetrically halogen substituted derivatives are redshifted and the substituents at 2,9,16,23- positions are more effective in redshifting the Q bands than those at 1,8,15,22-positions. Depending upon the basicity of the solvents, the ligand-to-metal charge transfer (LMCT) transitions on Q band envelop shift to the higher energy region in the order of pyridine>DMF>DMSO. The infrared absorption signals for C-H and metal-ligand vibrations appear to be sharper for 1,8,15,22 substituted derivatives than for 2,9,16,23 substituted ones.
authors.affiliation: Department of Inorganic and Physical chemistry, Indian Institute of Science, Bangalore 560 012, India.
authors.forename: M P
authors.initials: MP
authors.lastname: Somashekarappa
authors.forename: J
authors.initials: J
authors.lastname: Keshavayya
authors.forename: B S
authors.initials: BS
authors.lastname: Sherigara
mesh_terms: D000838:Anions / Q000737:chemistry; D002713:Chlorine / Q000737:chemistry*; D006219:Halogens / Q000737:chemistry*; D007211:Indoles / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D054833:Isoindoles; D008024:Ligands; D008280:Magnetics; D008956:Models, Chemical; D013055:Spectrophotometry, Infrared / Q000379:methods*; D014466:Ultraviolet Rays; D014961:X-Ray Diffraction
chemical_list: D000838:Anions; D006219:Halogens; D007211:Indoles; D054833:Isoindoles; D008024:Ligands; D002713:Chlorine; D007501:Iron; C013647:phthalocyanine