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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/114/04/0347-0356

    • Keywords

       

      Cu(I) complexes; pyridinecarboxaldehyde; HSAB; competition; reactions; chelate effect

    • Abstract

       

      Cu(I) complexes of formula Cu(PPh3)2LClO4 [L = 2 or 3 pyridine carboxaldehyde] are synthesised and characterised to explore the coordination of an aldehyde, a hard and neutral oxygen donor to a soft Cu(I) centre. The structural and spectroscopic results illustrate that only in 2-pyridinecarboxaldehyde, the ‘C=O’ group coordinates to soft Cu(I) centres due to a favourable chelate effect, while in 3-pyridinecarboxaldehyde, it remains uncoordinated. Upon chelation via N and O donors, 2-pyridinecarboxaldehyde resembles bipyridine or phenanthroline in terms of its bite angle and spectroscopic features. Such chelation can be easily challenged with coordinating anions like bromide, or more basic pyridines. A drastic change in the MLCT absorption signals the decomplexation of the ‘C=O’ group. The observed results point out that the Cu(I) centre can readily exchange the hard ‘O’ donor for softer ligands.

    • Author Affiliations

       

      D Saravanabharathi1 M Nethaji1 A G Samuelson1

      1. Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore - 560 012, India
    • Dates

       
  • Journal of Chemical Sciences | News

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