Synthesis, characterization and catalytic studies of chromium(III) porphyrin complex with axial cyanate ligands

Kechiche, Azhar; Fradi, Taissir; Noureddine, Olfa; Guergueb, Mouhieddinne; Guérineau, Vincent; Issoui, Noureddine; Bessmertnykh‐Lemeune, Alla; Nasri, Habib

doi:10.1016/j.molstruc.2021.131801

Cited by 7 publications

(1 citation statement)

References 74 publications

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“…In continuation of our general investigation concerning synthesis, the spectroscopic, electrochemical, and structural characterization of new porphyrin coordination compounds, we recently published several papers concerning zinc(II), magnesium(II) and cobalt(II) metalloporphyrins, which were tested as catalysts in the decomposition of several organic dyes [28][29][30].…”

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confidence: 99%

Synthesis of New Cobalt(III) Meso-Porphyrin Complex, Photochemical, X-ray Diffraction, and Electrical Properties for Photovoltaic Cells

et al. 2022

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The present work describes the preparation and characterization of a new cobalt(III) porphyrin coordination compound named (chlorido)(nicotinoylchloride)[meso-tetra(para-chlorophenyl)porphyrinato]cobalt(III) dichloromethane monosolvate with the formula [CoIII(TClPP)Cl(NTC)]·CH2Cl2 (4). The single-crystal X-ray molecular structure of 4 shows very important ruffling and waving distortions of the porphyrin macrocycle. The Soret and Q absorption bands of 4 are very red-shifted as a consequence of the very distorted porphyrin core. This coordination compound was also studied by fluorescence and cyclic voltammetry. The efficiency of our four porphyrinic compounds—the H2TClPP (1) free-base porphyrin, the [CoII(TClPP)] (2) and [CoIII(TClPP)Cl] (3) starting materials, and the new Co(III) metalloporphyrin [CoIII(TClPP)Cl(NTC)]·CH2Cl2 (4)—as catalysts in the photochemical degradation was tested on malachite green (MG) dye. The current voltage of complexes 3 and 4 was also studied. Electrical parameters, including the saturation current density (Js) and barrier height (ϕb), were measured.

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Section: Introductionmentioning

confidence: 99%

Synthesis of New Cobalt(III) Meso-Porphyrin Complex, Photochemical, X-ray Diffraction, and Electrical Properties for Photovoltaic Cells

et al. 2022

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Evaluation of the influence of chromium(III) ions and protoporphyrin IX on the oxidative stability of biodiesel

Gonçales Filho,

de Toledo,

Alves

et al. 2024

J Americ Oil Chem Soc

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This study aimed to investigate the impact of porphyrin complexes with Cr3+ on the oxidative stability of biodiesel. Specifically, it focused on assessing the induction period as well as the fluorescence and FTIR spectroscopy, kinetic and thermodynamic parameters of oxidation under varying temperature conditions. The concentration of the metal added in the biodiesel samples, with and without protoporphyrin IX (PPIX), was established based on previous literature. Oxidative stability tests were carried out at 105, 110, 115, and 120°C. The Cr3+ transition metal ion exhibited low catalytic activity in biodiesel oxidation reactions, and the tests without PPIX showed lower induction period values for all temperatures. PPIX exhibited antioxidant action, delaying both the initiation and propagation stages of chain reactions responsible for the formation of free radicals, thereby enhancing the stability of the biofuel even in the presence of Cr3+, when compared to the same test without the addition of the compound. The fluorescence intensity of PPIX decreased as a function of the contact time with the metal ion, and the FTIR analysis of the biodiesel with PPIX presented the most significant variations in the spectra. The tests containing PPIX at all temperatures presented lower values of reaction rate than the control samples, while the test without PPIX with Cr3+ ion resulted in higher k in comparison to control. The activation energy values ranged from 43.36 to 106.37 kJ mol−1. The results of thermodynamic parameters indicated greater stability for biodiesel containing PPIX, with enthalpy activation (ΔH‡) and entropy activation (ΔS‡) values of 103.16 kJ mol−1 and ‐52.61 J.K−1.mol−1, respectively.

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Bis(2,3,5,6‐tetrafluorothiophenolato) Iron(III) (α,α,α,β)‐Tetrakis(o–pivalamidophenyl)porphyrin Ion Complex: Synthesis, Spectroscopic, Structural Characterization and Computational Studies

Dhifet,

Gassoumi,

Issaoui

et al. 2024

ChemistrySelect

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In this work, we present the synthesis of the cryptand‐222)potassium bis(2,3,5,6‐tetrafluorothiophenolato)[α,α,α,β‐tetrakis(o‐pivalamidophenyl) porphyrinato]iron(III) with the formula [K(cryp‐222)][FeIII(TpivPP)(C6HF4S)2] (I). Notably, we started with the (α,α,α,α) atropisomer and the final product is made by the (α,α,α,β) atropisomer as shown by the X‐ray molecular structure of complex I. The crystal structure of our P450 model indicates that the mean equatorial distance between the central ion and the four nitrogen atoms of the pyrrole ring of the porphyrin (Fe−Np) is equal to 1.997(6) Å indicating that complex I is a ferric low‐spin complex (S=1/2). Both X‐ray molecular structure and Hirshfeld surface analysis show that the crystal packing of I is made by C−H⋅⋅⋅O and C−H⋅⋅⋅F weak intermolecular hydrogen interactions involving neighboring [FeIII(TpivPP)(C6HF4S)2]− ion complexes. Furthermore, the characteristics of the HOMO and LUMO molecular frontier orbitals and the reactivity of complex I were investigated by DFT/B3LYP/LanL2DZ level of DFT and a Molecular Electrostatic Potential (MEP) calculation has been made to determine the nucleophilic‐electrophilic of this new ferric metalloporphyrin.

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Synthesis, characterization and catalytic studies of chromium(III) porphyrin complex with axial cyanate ligands

Cited by 7 publications

References 74 publications

Synthesis of New Cobalt(III) Meso-Porphyrin Complex, Photochemical, X-ray Diffraction, and Electrical Properties for Photovoltaic Cells

Synthesis of New Cobalt(III) Meso-Porphyrin Complex, Photochemical, X-ray Diffraction, and Electrical Properties for Photovoltaic Cells

Evaluation of the influence of chromium(III) ions and protoporphyrin IX on the oxidative stability of biodiesel

Bis(2,3,5,6‐tetrafluorothiophenolato) Iron(III) (α,α,α,β)‐Tetrakis(o–pivalamidophenyl)porphyrin Ion Complex: Synthesis, Spectroscopic, Structural Characterization and Computational Studies

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