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Lanthanide(III)complexes; 2-benzoylpyridine benzhydrazone; structure determination; 12-coordinated cerium complex; DNA binding, supramolecular interactoions.

The lanthanide(III) complexes of general formula of [Ln(BPBH)₂(NO₃)₃] (where, Ln = La, Ce, Pr, Nd and BPBH = 2-benzoylpyridine benzhydrazone) have been synthesized and characterized by elemental analysis, molar conductance, spectroscopic (UV, IR), electrochemical and single crystal X-ray diffraction studies. The coordination mode of the ligand and the geometry of [Ce(BPBH)₂(NO₃)₃] are confirmed by single crystal X-ray studies. The crystals are monoclinic with C2/c crystallographic symmetry. The central metal is 12 coordinated and the coordination polyhedron around the cerium atom can be described as a distorted icosahedron. The existence of nitrate. . . 𝜋 and CH. . . 𝜋 stacking interactions in the [Ce(BPBH)₂(NO₃)₃] leads to a supramolecular arrangement in its network. The binding properties of these complexes with calf-thymus DNA have been investigated by viscosity measurements. The complexes show more nuclease activity in the presences of H₂O₂.

Karreddula Raja¹ Akkili Suseelamma¹ Katreddi Hussain Reddy¹

1. Department of Chemistry, Sri Krishnadevaraya University, Anantapur 515 003, India

Published

January 2016

Manuscript received

24 June 2015

Manuscript revised

20 August 2015

Accepted

14 October 2015

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