• 4-Nitro and 4-chloro pyridine-N-oxide complexes of lanthanide perchlorates

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      https://www.ias.ac.in/article/fulltext/jcsc/088/06/0413-0420

    • Keywords

       

      Lanthanide perchlorates; 4-nitro pyridine-N-oxide; 4-chloro pyridine-N-oxide; electrolytic conductance; proton-NMR; electronic spectra

    • Abstract

       

      Adducts of lanthanide perchlorates with 4-nitro and 4-chloro pyridine-Noxides (4-NPNO and 4-CPNO respectively) have been synthesised for the first time and characterised by analysis, electrolytic conductance, infrared, proton-NMR and electronic spectral data. The complexes are of the compositions Ln2(NPNO)15 (ClO4)6 (Ln = La, Pr, Nd and Gd), Tb(NPNO), (C1O4)6), Ln2(NPNO)13 (C1O4)6) (Ln = Dy, Ho, and Yb); Ln (CPNO)8 (C104)3) (Ln = La, Pr, Nd, Tb, Dy, Ho and Yb) and Ln(CPNO), (C1O4)3) (Ln = Sm and Gd). Conductivity and IR data provide evidence for the non-coordinated nature of the perchlorate groups. IR and NMR spectra suggest coordinationvia the oxygen of the N-oxide group. Electronic spectral shapes of the Nd+3 and Ho+3 complexes are interpreted in terms of eight-and seven-coordinate environments in the case of 4-NPNO complexes and eight-coordination in the case of 4-CPNO complexes. IR data indicate bridged structure in NPNO complexes of lanthanides other than Tb.

    • Author Affiliations

       

      N S Navaneetham1 S Soundararajan1

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

       
  • Journal of Chemical Sciences | News

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