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NO2-induced synthesis of nitrato-iron(III) porphyrin with diverse coordination mode and the formation of isoporphyrin‡

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Abstract

Two nitrato-iron(III) porphyrinates [Fe(4-Me-TPP)(NO3)] 1 and [Fe(4-OMe-TPP)(NO3)] 2 are reported. Interestingly, [Fe(4-Me-TPP)(NO3)] 1 has nitrate ion coordinated as monodentate (by single oxygen atom), while [Fe(4-OMe-TPP)(NO3)] 2 has nitrate coordination through bidentate mode. Compound 1 was found serendipitously in the reaction of [Fe(4-Me-TPP)Cl] with nitrous acid, which was performed for the synthesis of nitro-iron(III) porphyrin, [Fe(4-Me-TPP)NO2]. The compound 2 was synthesized by passing NO2 gas through a solution of [Fe(4-OMe-TPP)]2O. Upon passing NO2 gas through a solution of a μ-oxo-dimer, [Fe(4-Me-TPP)]2O also produces 1. It is interesting that in more electron-rich porphyrin 2, binding of the nitrate in a symmetrical bidentate way while in less electron-rich porphyrin 1, binding of the anion is unidentate by a terminal oxygen atom. However, it is expected that the energy difference between the monodentate and bidentate coordination mode is very small and the interchange between these coordination is possible. Upon passing NO2 gas through a solution of \(\upmu \)-oxo-dimeric iron(III) porphyrin, the nitrato-iron(III) porphyrin forms first, that later gets oxidized to π-cation radical to yield hydroxy-isoporphyrin in the presence of trace amount of water. These nitrato-iron(III) porphyrinates in moist air slowly converted back to their respective \(\upmu \)-oxo-dimeric iron(III) porphyrins.

[Fe(4-Me-TPP)]2O and [Fe(4-OMe-TPP)]2O react with NO2 to produce nitratoiron( III) porphyrin with monodentate and bidenate nitrate coordination, respectively. Further passage of NO2 oxidized these to π-cation radical to yield hydroxy-isoporphyrin in the presence of moisture. But nitrato-iron(III) porphyrinates in moist air slowly converted back to their respective μ-oxodimeric iron(III) porphyrins.

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Acknowledgements

JB acknowledges Doctoral Research Fellowships from the Council of Scientific and Industrial Research (CSIR), New Delhi and SS thanks the Department of Science and Technology (DST) New Delhi for funding the project.

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Authors and Affiliations

  1. Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208 016, India

    JAGANNATH BHUYAN

  2. Department of Chemistry, Bengal Engineering and Science University, Shibpur, Howrah, 711 103, India

    SABYASACHI SARKAR

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  1. JAGANNATH BHUYAN
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Correspondence to SABYASACHI SARKAR.

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Supplementary material

CCDC 890195 and 890196 contains the supplementary crystallographic data for this paper. These data can be obtained free of charge from the Cambridge Crystallographic Data Centre via http://www.ccdc.cam.ac.uk/data_request/cif. For supplementary figures S1–S5, see the journal website (www.ias.ac.in/chemsci).

‡Dedicated in memory of Prof. P T Narasimhan

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BHUYAN, J., SARKAR, S. NO2-induced synthesis of nitrato-iron(III) porphyrin with diverse coordination mode and the formation of isoporphyrin‡ . J Chem Sci 125, 707–714 (2013). https://doi.org/10.1007/s12039-013-0447-1

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