3 research outputs found
Оценка экологической опасности рассеивания газопылевого облака при массовых взрывах в карьерах
Heteroanion
(HA) moieties have a key role in templating of heteropolyoxometalate
(HPA) architectures, but clusters templated by two different templates
are rarely reported. Herein, we show how a cross-shaped HPA-based
architecture can self-sort the HA templates by pairing two different
guests into a divacant {XYW<sub>15</sub>O<sub>54</sub>} building block,
with four of these building block units being linked together to complete
the cross-shaped architecture. We exploited this observation to incorporate
HA templates into well-defined positions within the clusters, leading
to the isolation of a collection of mixed-HA templated cross-shaped
polyanions [(XYW<sub>15</sub>O<sub>54</sub>)<sub>4</sub>(WO<sub>2</sub>)<sub>4</sub>]<sup>32–/36–</sup> (X = H–P, Y
= Se, Te, As). The template positions have been unambiguously determined
by single crystal X-ray diffraction, NMR spectroscopy, and high-resolution
electrospray ionization mass spectrometry; these studies demonstrated
that the mixed template containing HPA clusters are the preferred
products which crystallize from the solution. Theoretical studies
using DFT calculations suggest that the selective self-sorting originates
from the coordination of the template in solution. The cross-shaped
polyoxometalate clusters are redox-active, and the ability of molecules
to accept electrons is slightly modulated by the HA incorporated as
shown by differential pulse voltammetry experiments. These results
indicate that the cross-shaped HPAs can be used to select templates
from solution, and themselves have interesting geometries, which will
be useful in developing functional molecular architectures based upon
HPAs with well-defined structures and electronic properties
Self-Sorting of Heteroanions in the Assembly of Cross-Shaped Polyoxometalate Clusters
Heteroanion
(HA) moieties have a key role in templating of heteropolyoxometalate
(HPA) architectures, but clusters templated by two different templates
are rarely reported. Herein, we show how a cross-shaped HPA-based
architecture can self-sort the HA templates by pairing two different
guests into a divacant {XYW<sub>15</sub>O<sub>54</sub>} building block,
with four of these building block units being linked together to complete
the cross-shaped architecture. We exploited this observation to incorporate
HA templates into well-defined positions within the clusters, leading
to the isolation of a collection of mixed-HA templated cross-shaped
polyanions [(XYW<sub>15</sub>O<sub>54</sub>)<sub>4</sub>(WO<sub>2</sub>)<sub>4</sub>]<sup>32–/36–</sup> (X = H–P, Y
= Se, Te, As). The template positions have been unambiguously determined
by single crystal X-ray diffraction, NMR spectroscopy, and high-resolution
electrospray ionization mass spectrometry; these studies demonstrated
that the mixed template containing HPA clusters are the preferred
products which crystallize from the solution. Theoretical studies
using DFT calculations suggest that the selective self-sorting originates
from the coordination of the template in solution. The cross-shaped
polyoxometalate clusters are redox-active, and the ability of molecules
to accept electrons is slightly modulated by the HA incorporated as
shown by differential pulse voltammetry experiments. These results
indicate that the cross-shaped HPAs can be used to select templates
from solution, and themselves have interesting geometries, which will
be useful in developing functional molecular architectures based upon
HPAs with well-defined structures and electronic properties
Self-Sorting of Heteroanions in the Assembly of Cross-Shaped Polyoxometalate Clusters
Heteroanion
(HA) moieties have a key role in templating of heteropolyoxometalate
(HPA) architectures, but clusters templated by two different templates
are rarely reported. Herein, we show how a cross-shaped HPA-based
architecture can self-sort the HA templates by pairing two different
guests into a divacant {XYW<sub>15</sub>O<sub>54</sub>} building block,
with four of these building block units being linked together to complete
the cross-shaped architecture. We exploited this observation to incorporate
HA templates into well-defined positions within the clusters, leading
to the isolation of a collection of mixed-HA templated cross-shaped
polyanions [(XYW<sub>15</sub>O<sub>54</sub>)<sub>4</sub>(WO<sub>2</sub>)<sub>4</sub>]<sup>32–/36–</sup> (X = H–P, Y
= Se, Te, As). The template positions have been unambiguously determined
by single crystal X-ray diffraction, NMR spectroscopy, and high-resolution
electrospray ionization mass spectrometry; these studies demonstrated
that the mixed template containing HPA clusters are the preferred
products which crystallize from the solution. Theoretical studies
using DFT calculations suggest that the selective self-sorting originates
from the coordination of the template in solution. The cross-shaped
polyoxometalate clusters are redox-active, and the ability of molecules
to accept electrons is slightly modulated by the HA incorporated as
shown by differential pulse voltammetry experiments. These results
indicate that the cross-shaped HPAs can be used to select templates
from solution, and themselves have interesting geometries, which will
be useful in developing functional molecular architectures based upon
HPAs with well-defined structures and electronic properties