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

Navaneetham, NS and Soundararajan, S (1979) 4-Nitro and 4-chloro pyridine-N-oxide complexes of lanthanide perchlorates. In: Journal of Chemical Sciences, 88 (6). pp. 413-420.

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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.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Springer India, in co-publication with Indian Academy of Sciences.
Keywords: Lanthanide perchlorates;4-nitro pyridine-N-oxide;4-chloro pyridine-N-oxide;electrolytic conductance;proton-NMR; electronic spectra.
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 27 Oct 2009 13:16
Last Modified: 19 Sep 2010 05:51
URI: http://eprints.iisc.ernet.in/id/eprint/24766

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