Synthesis and Spectroscopic Investigations of Iron(III) Complexes with Chlorides and Dianionic, Symmetrically Halogen Substituted Phthalocyanines as Ligands

Somashekarappa, MP and Keshavayya, J and Sherigara, BS (2003) Synthesis and Spectroscopic Investigations of Iron(III) Complexes with Chlorides and Dianionic, Symmetrically Halogen Substituted Phthalocyanines as Ligands. In: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 59 (4). pp. 883-893.

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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 iscussed. 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.

Item Type:	Journal Article
Publication:	Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier.
Keywords:	Iron(III) phthalocyanine complexes;UV-visible;IR;Charge transfer transitions
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	22 Jun 2006
Last Modified:	08 Jul 2011 10:46
URI:	http://eprints.iisc.ac.in/id/eprint/7678

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