Ir and Uv-Visible Spectra of Iron(ii) Phthalocyanine Complexes With Phosphine or Phosphite

Abstract

ABSTRACT.We have prepared and studied by vibrational and electronic spectrometry of a series of ferrophthalocyanine complexes with phosphine or phosphite axial ligands [PMe3, P(OMe)3, PPh3, P(OPh)3, PPh(OMe)3 and POH(OEt)2]. With PMe3, P(OMe)3 as ligands, only hexacoordinated complexes are obtained but with PPh3, P(OPh)3 and POH(OEt)2 as ligands, the coordination number depends on the FePc:ligand ratio in the reaction mixture. In the ratio 1:1 the complexes thus formed are pentacoordinated and in the ratio 1:2 hexacoordinated complexes are obtained. In the electronic spectra of hexacoordinated complexes, two charge-transfer transition bands, one at ~375 nm and the other at ~421 nm can be observed. We attribute the band at 375 nm to charge-transfer from axial ligand to macrocycle (CT Lax ® Pc) and the band at 421 nm to charge-transfer from metal to axial ligand (CT Fe ® Lax). In the IR spectra, the position of the nFeN4 band is linked to the coordination number; in the spectra of pentacoordinated complexes, its frequency is almost the same as that in the FePc spectrum but in hexacoordinated complexes, it moves to high frequencies.

Phthalocyanine Doped Metal Oxide Nanoparticles on Multiwalled Carbon Nanotubes Platform for the detection of Dopamine

“…Phthalocyanines (Pcs) and their derivatives are well-known blue-green organic semiconductor materials that belong to the family of aromatic heterocyclic conjugated molecules, with alternating single-double bond structures 16 . They are made of delocalised π-electrons system 17 , where π-electron delocalisation and interactions with central mental atom on metal phthalocyanines (MPcs) determine the redox properties 18 . Their thermal and chemical stability are important properties that make them molecules to be incorporated into electrochemical sensors.…”

Electrocatalytic oxidation of Epinephrine and Norepinephrine at metal oxide doped phthalocyanine/MWCNT composite sensor

“…They are made of delocalised π-electrons system30, where π-electron delocalisation and interactions with central metal atom on metal phthalocyanines MPcs determine the redox properties31. Their thermal and chemical stability are important properties that make them molecules to be incorporated into electrochemical sensors.…”

“…Phthalocyanines (Pcs) and their derivatives are well-known blue-green organic semiconductor materials that belong to the family of aromatic heterocyclic conjugated molecules, with alternating single-double bond structures 29 . They are made of delocalised π-electrons system 30 , where π-electron delocalisation and interactions with central metal atom on metal phthalocyanines MPcs determine the redox properties 31 . Their thermal and chemical stability are important properties that make them molecules to be incorporated into electrochemical sensors.…”

Préparation et études vibrationnelle et électronique de complexes de la phtalocyanine d’or avec des ligands axiaux pyridine et pyridines substituées

“…Des travaux déjà effectués sur des complexes de FePc portant les ligands phosphines et phosphites ont permis de différencier les complexes hexacoordinés des complexes pentacoordinés en spectrométrie optique. Les spectres des complexes pentacoordinées (FePcPX 3 ) dans le DMSO présentent une bande Q dédoublée (Zanguina, 2002). Ces mêmes caractéristiques spectrales ont été observées avec des composés tels que FePcCl, FePcSR, FePcH 2 O et FePcPy (Bayo-Bangoura et al, 2003).…”

“…Ces mêmes caractéristiques spectrales ont été observées avec des composés tels que FePcCl, FePcSR, FePcH 2 O et FePcPy (Bayo-Bangoura et al, 2003). Alors que les spectres des complexes hexacoordinés présentent une bande Q non dédoublée (Zanguina, 2002). Les spectres des composés de réaction de AuPc avec les ligands pyridine et pyridines substituées ne présentent pas une bande Q dédoublée.…”