6 research outputs found
Four 2D “Fully Reduced” Polyoxovanadates: Vanadium Oxide Clusters Encapsulating Different Guest Molecules
Four
two-dimensional fully reduced polyoxovanadates, namely, [CdÂ(DAP)<sub>2</sub>]<sub>4</sub>Â[HV<sup>III</sup><sub>3</sub>V<sup>IV</sup><sub>18</sub>P<sub>6</sub>O<sub>60</sub>(DAP)<sub>3</sub>Â(HOCH<sub>2</sub>CH<sub>2</sub>OH)]·10H<sub>2</sub>O <b>(1)</b>,
[CdÂ(DAP)<sub>2</sub>]<sub>4</sub>Â[HV<sup>III</sup><sub>3</sub>V<sup>IV</sup><sub>18</sub>P<sub>6</sub>O<sub>60</sub>(DAP)<sub>3</sub>Â(CH<sub>3</sub>OH)]·11H<sub>2</sub>O <b>(2),</b> [CdÂ(DAP)<sub>2</sub>]<sub>4</sub>Â[HV<sup>III</sup><sub>3</sub>V<sup>IV</sup><sub>18</sub>P<sub>6</sub>O<sub>60</sub>(DAP)<sub>3</sub>Â(CH<sub>3</sub>CH<sub>2</sub>OH)]·4H<sub>2</sub>O (<b>3</b>) and Co<sup>III</sup>(DAP)<sub>3</sub>Â[Co<sup>II</sup>(DAP)<sub>2</sub>]<sub>3</sub>[V<sup>III</sup><sub>3</sub>V<sup>IV</sup><sub>18</sub>P<sub>6</sub>O<sub>60</sub>(DAP)<sub>3</sub>Â(HOCH<sub>2</sub>CH<sub>2</sub>OH)]·14H<sub>2</sub>O (<b>4</b>)
were synthesized by virtue of the reducing power of alkylamine in
hydrothermal conditions. Single-crystal X-ray structural
analysis, magnetic measurement, IR spectroscopy, elemental analysis,
and thermogravimetric measurements were performed to analyze the structures
and properties of these four compounds. Structural analysis indicates
that the four compounds contain the same huge low-valent vanadium
oxide anion cages [V<sup>III</sup><sub>3</sub>V<sup>IV</sup><sub>18</sub>P<sub>6</sub>O<sub>60</sub>(DAP)<sub>3</sub>]<sup>9–</sup>, and the cages can catch different guest molecules. Four cages are
linked by Co or Cd atoms to form a four-membered ring, while adjacent
four-membered rings are connected to each other by sharing edges to
make an inorganic–organic hybrid layer. The magnetic susceptibility
measurements of four compounds indicate ferrimagnetic interactions
between vanadium ions
Four 2D “Fully Reduced” Polyoxovanadates: Vanadium Oxide Clusters Encapsulating Different Guest Molecules
Four
two-dimensional fully reduced polyoxovanadates, namely, [CdÂ(DAP)<sub>2</sub>]<sub>4</sub>Â[HV<sup>III</sup><sub>3</sub>V<sup>IV</sup><sub>18</sub>P<sub>6</sub>O<sub>60</sub>(DAP)<sub>3</sub>Â(HOCH<sub>2</sub>CH<sub>2</sub>OH)]·10H<sub>2</sub>O <b>(1)</b>,
[CdÂ(DAP)<sub>2</sub>]<sub>4</sub>Â[HV<sup>III</sup><sub>3</sub>V<sup>IV</sup><sub>18</sub>P<sub>6</sub>O<sub>60</sub>(DAP)<sub>3</sub>Â(CH<sub>3</sub>OH)]·11H<sub>2</sub>O <b>(2),</b> [CdÂ(DAP)<sub>2</sub>]<sub>4</sub>Â[HV<sup>III</sup><sub>3</sub>V<sup>IV</sup><sub>18</sub>P<sub>6</sub>O<sub>60</sub>(DAP)<sub>3</sub>Â(CH<sub>3</sub>CH<sub>2</sub>OH)]·4H<sub>2</sub>O (<b>3</b>) and Co<sup>III</sup>(DAP)<sub>3</sub>Â[Co<sup>II</sup>(DAP)<sub>2</sub>]<sub>3</sub>[V<sup>III</sup><sub>3</sub>V<sup>IV</sup><sub>18</sub>P<sub>6</sub>O<sub>60</sub>(DAP)<sub>3</sub>Â(HOCH<sub>2</sub>CH<sub>2</sub>OH)]·14H<sub>2</sub>O (<b>4</b>)
were synthesized by virtue of the reducing power of alkylamine in
hydrothermal conditions. Single-crystal X-ray structural
analysis, magnetic measurement, IR spectroscopy, elemental analysis,
and thermogravimetric measurements were performed to analyze the structures
and properties of these four compounds. Structural analysis indicates
that the four compounds contain the same huge low-valent vanadium
oxide anion cages [V<sup>III</sup><sub>3</sub>V<sup>IV</sup><sub>18</sub>P<sub>6</sub>O<sub>60</sub>(DAP)<sub>3</sub>]<sup>9–</sup>, and the cages can catch different guest molecules. Four cages are
linked by Co or Cd atoms to form a four-membered ring, while adjacent
four-membered rings are connected to each other by sharing edges to
make an inorganic–organic hybrid layer. The magnetic susceptibility
measurements of four compounds indicate ferrimagnetic interactions
between vanadium ions
An Unprecedented M–O Cluster Constructed from Nanosized {[C<sub>5</sub>NH<sub>5</sub>]<sub>9</sub>[H<sub>31</sub>Mo<sup>V</sup><sub>12</sub>O<sub>24</sub>Co<sup>II</sup><sub>12</sub>(PO<sub>4</sub>)<sub>23</sub>(H<sub>2</sub>O)<sub>4</sub>]}<sup>2–</sup> Anions Exhibiting Interesting Nonlinear-Optical Properties
A novel high-nuclear
nanosized cluster modified by conjugated organic ligands (pyridine
and imidazole), [C<sub>5</sub>NH<sub>5</sub>]<sub>8</sub>Â[C<sub>3</sub>H<sub>5</sub>N<sub>2</sub>]<sub>2</sub>Â{[C<sub>5</sub>NH<sub>5</sub>]<sub>9</sub>​Â[H<sub>31</sub>Mo<sub>12</sub>O<sub>24</sub>Co<sub>12</sub>​Â(PO<sub>4</sub>)<sub>23</sub>Â(H<sub>2</sub>O)<sub>4</sub>]}·12H<sub>2</sub>O (<b>1</b>), has been successfully isolated under hydrothermal conditions
and structurally characterized. Compound <b>1</b> consists of
12 Co<sup>II</sup> and 12 Mo<sup>V</sup> ions linked by 23 {PO<sub>4</sub>} groups, exhibiting unprecedented nanosized ship-shaped clusters.
The magnetic measurements reveal that compound <b>1</b> exhibits
dominant antiferromagnetic interactions. Additionally, pyridine and
imidazole ligands enhance the delocalized electron effects of clusters,
and the third-order nonlinear-optical response of compound <b>1</b> is excellent
POM Constructed from Super-Sodalite Cage with Extra-Large 24-Membered Channels: Effective Sorbent for Uranium Adsorption
A POMs-based
sorbent functionalized by phosphate groups: H<sub>33</sub>Na<sub>14</sub>Mo<sup>V</sup><sub>24</sub>Mo<sup>VI</sup><sub>2</sub>(PO<sub>4</sub>)<sub>11</sub>O<sub>73</sub> has been
successfully isolated under hydrothermal conditions. The cooperative
assembly of the ring-shaped polyoxometalate structural building unit
{P<sub>4</sub>Mo<sub>6</sub>} and MoO<sub>4</sub> tetrahedra linkers
gives rise to an unprecedented supersodalite cage containing approximately
spherical cavities with a 8.76 Ă… diameter. As POMs-based inorganic
material, compound <b>1</b> was first applied as sorbent to
adsorb UÂ(VI) from aqueous solution, exhibiting good stability, high
efficiency, and selectivity. The maximum sorption capacity reaches
325.9 mg g<sup>–1</sup>, which may capture radionuclides through
cooperative binding of the phosphate groups. The adsorbed UÂ(VI) could
be nearly drastically eluted when using 0.1 M Na<sub>2</sub>CO<sub>3</sub> and the sorption capacity for UÂ(VI) slightly decreased 10.16%
through five successive sorption/desorption cycles. This work represents
first application of POMs-based inorganic materials as sorbent to
adsorb uranium from aqueous solution and provides a feasible approach
for the entrapment and recovery of radionuclides
A Novel Dumbbell-like Polyoxometalate Assembled of Copper(II)-Disubstituted Monovacant Keggin Polyoxoanions with a Tetranuclear Copper Cluster
A dimeric
Keggin polyoxometalate, [CuÂ(bpy)Â(ÎĽ<sub>2</sub>-OH)]<sub>4</sub>[(H<sub>2</sub>O)Â(bpy)<sub>2</sub>HPW<sub>11</sub>Cu<sub>2</sub>O<sub>39</sub>]<sub>2</sub>·2CH<sub>3</sub>CH<sub>2</sub>OH·10H<sub>2</sub>O (<b>1</b>), constructed from two dicopperÂ(II)-substituted
monovacant Keggin polyoxoanions bridged by a Cu<sub>4</sub> cluster,
has been hydrothermally synthesized. Magnetic analysis indicates predominantly
an antiferromagnetic interaction between copperÂ(II) centers. Compound <b>1</b> also shows very high catalytic activity for the esterification
of phosphoric acid with equimolar lauryl alcohol to monoalkyl phosphate
ester
POM Constructed from Super-Sodalite Cage with Extra-Large 24-Membered Channels: Effective Sorbent for Uranium Adsorption
A POMs-based
sorbent functionalized by phosphate groups: H<sub>33</sub>Na<sub>14</sub>Mo<sup>V</sup><sub>24</sub>Mo<sup>VI</sup><sub>2</sub>(PO<sub>4</sub>)<sub>11</sub>O<sub>73</sub> has been
successfully isolated under hydrothermal conditions. The cooperative
assembly of the ring-shaped polyoxometalate structural building unit
{P<sub>4</sub>Mo<sub>6</sub>} and MoO<sub>4</sub> tetrahedra linkers
gives rise to an unprecedented supersodalite cage containing approximately
spherical cavities with a 8.76 Ă… diameter. As POMs-based inorganic
material, compound <b>1</b> was first applied as sorbent to
adsorb UÂ(VI) from aqueous solution, exhibiting good stability, high
efficiency, and selectivity. The maximum sorption capacity reaches
325.9 mg g<sup>–1</sup>, which may capture radionuclides through
cooperative binding of the phosphate groups. The adsorbed UÂ(VI) could
be nearly drastically eluted when using 0.1 M Na<sub>2</sub>CO<sub>3</sub> and the sorption capacity for UÂ(VI) slightly decreased 10.16%
through five successive sorption/desorption cycles. This work represents
first application of POMs-based inorganic materials as sorbent to
adsorb uranium from aqueous solution and provides a feasible approach
for the entrapment and recovery of radionuclides