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Anderson type polyoxometalates; lanthanides; one-dimensional inorganic polymers; isomorphous solids; spectroscopy.

One-dimensional isomorphous inorganic polymers containing Anderson type heteropoly anion as a basic building unit, namely [La(H₂O)₇Cr(OH)₆Mo₆O₁₈]$_n$·4nH₂O (1), [Gd(H₂O)₇Cr(OH)₆Mo₆O₁₈]$_n$·4nH₂O (2), [Gd(H₂O)₇Al(OH)₆Mo₆O₁₈]$_n$·4nH₂O (3), and [Eu(H₂O)₇Al(OH)₆Mo₆O₁₈]$_n$·4nH₂O (4) have been synthesized and studied by the powdered X-ray diffraction, TGA, IR, electronic and ESR spectroscopy, and unambiguously by single crystal X-ray crystallography. Isomorphous compounds 1-4 are crystallized in orthorhombic system with $Pca2_1$ space group. The crystal structure analysis reveals a one-dimensional extended chain in which the Anderson type heteropolyanion, acting as the building unit, is linked by rare earth metal ions in a zig-zag fashion. In the crystal structure, all types of oxygens of the heteropolyanion, lattice waters, lanthanum coordinated waters are extensively involved in O—H…O hydrogen bonding interactions. Compounds are additionally characterized by UV-visible and ESR spectroscopy.

Vaddypally Shivaiah¹ Tanmay Chatterjee¹ Samar K Das¹

1. School of Chemistry, University of Hyderabad, Hyderabad 500 046, India

Published

September 2014

Manuscript received

14 April 2014

Manuscript revised

12 June 2014

Accepted

1 July 2014

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