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Data · collection · 2016

Syntheses and structures of two new lithium-heptamolybdates

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The synthesis, crystal structures, IR, UV–vis, 7 Li NMR spectra, electrochemical investigations, and conductivity studies of two new lithium-heptamolybdates, (NH 4 ) 4 [Li 2 (H 2 O) 7 ][Mo 7 O 24 ]·H 2 O ( 1 ) and (NH 4 ) 3 [Li 3 (H 2 O) 4 ( μ 6 -Mo 7 O 24 )]·2H 2 O ( 2 ), are reported.

Description

In 1 the (NH 4 ) + and [Li 2 (H 2 O) 7 ] 2+ , cations are charge balanced by the heptamolybdate anion. In 2 , the [Mo 7 O 24 ] 6− anion is coordinated to three unique Li + ions via a μ 6 -hexadentate-binding mode resulting in the formation of a two-dimensional (2-D) [Li 3 (H 2 O) 4 ( μ 6 -Mo 7 O 24 )] 3− anionic complex, charge neutralized by three (NH 4 ) + ions.

The cations, anions, and the lattice water molecules in 1 and 2 are linked by weak H-bonding interactions.

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