• BISHNU PRASAD BORAH

      Articles written in Journal of Chemical Sciences

    • Influence of position of methoxy groups in Zn-methoxyphenylporphyrins

      BISHNU PRASAD BORAH JAGANNATH BHUYAN

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      The crystal structure of the compound, Zn(II) 5,10,15,20-tetrakis(meta-methoxyphenyl)porphyrin chloroform trisolvate, [ZnT(m-OCH3)PP]·3CHCl3 1 reveals that it forms a weak one-dimensional chain structure through interaction between Zn of porphyrin and the oxygen atom of the methoxy group of a neighbouring porphyrin. The zinc–oxygen interaction observed in compound 1 is compared with Zn(II) 5,10,15,20-tetrakis(para-methoxyphenyl)porphyrin [ZnT(p-OCH3) PP] 2 and Zn(II) 5,10,15,20-tetrakis(3,4,5-tri-methoxyphenyl)porphyrin

      [ZnT(3, 4, 5-triOCH3)PP] 3 to understand the preferred methoxy-position ofinteraction. The strength of the non-covalent zinc–oxygen (methoxy group of a neighboring porphyrin) interaction in compound 1 is in between that of similar interactions observed in compounds 2 and 3. The Mulliken charge analysis using theoretical calculation at the DFT level shows that the meta-methoxy oxygenhas a higher probability of binding to the metal than the para-methoxy oxygen. In the presence of nucleophiles, the formation of one-dimensional chain structure stops due to the binding of the nucleophiles to the metal zinc. The photoluminescence and differential scanning calorimetric studies were also performed for compound 1.

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