Two Compounds Constructed from Bimolybdenum-Capped Sandwich-Type
Tetra-Ni-molybdogermanate and N‑Donor Multidentate Ligand
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Abstract
Two
organic–inorganic hybrid bimolybdenum-capped tetra-Ni<sup>II</sup> sandwich-type molybdogermanates, namely, (H<sub>2</sub>L)<sub>4</sub>[Ni<sub>4</sub>(H<sub>2</sub>O)<sub>2</sub>{B-α-GeMo<sub>9</sub>O<sub>34</sub> (MoO<sub>2</sub>)}<sub>2</sub>]·6H<sub>2</sub>O (<b>1</b>), [Ni<sub>2</sub>(HL)<sub>4</sub>(H<sub>2</sub>O)<sub>2</sub>][Ni<sub>4</sub>(H<sub>2</sub>O)<sub>2</sub>{B-α-GeMo<sub>9</sub>O<sub>34</sub>(MoO<sub>2</sub>)}<sub>2</sub>]·12H<sub>2</sub>O (<b>2</b>), L = 2,4,5-tri(4-pyridyl)imidazole,
were prepared with hydrothermal synthesis method and characterized
by elemental analysis, IR spectroscopy, powder X-ray diffraction,
thermogravimetric analysis, and single-crystal X-ray diffraction.
Their magnetic properties and electrochemical properties were investigated.
The results show that compounds <b>1</b> and <b>2</b> contain
a new bimolybdenum-capped sandwich-type heteropolymolybdate anion,
[Ni<sub>4</sub>(H<sub>2</sub>O)<sub>2</sub>{B-α-GeMo<sub>9</sub>O<sub>34</sub>(MoO<sub>2</sub>)}<sub>2</sub>]<sup>8–</sup>. The compound <b>1</b> is a zero-dimensional supramolecular
compound, and the supramolecular architecture of compound <b>2</b> is constructed from covalent layers through hydrogen bonds and π–π
interaction. The two compounds both present electrocatalytic activities
for the reduction of nitrite
