A new antimonato polyoxovanadate {Zn(en) } [V Sb O (H O)]⋅3 en⋅10 H O (en=ethylenediamine) synthesized under hydrothermal conditions exhibits remarkable solubility in water. Electrospray ionization mass spectrometry (ESI-MS) investigations on an aqueous solution demonstrate that the cluster core remains fully intact for 72 h. At longer times, slow transformation into a {V Sb O } cluster is observed. The conversion reaches 50 % after 14 days and is complete after approximately 20 days. The rate of this {V Sb }→{V Sb } cluster transformation is significantly increased in the presence of ammonium acetate. Applying the new compound as a synthon in the presence of 1,10-phenanthroline (phen) led to crystallization of {Zn(phen) } [Zn(en) V Sb O (H O)]⋅23 H O after a short reaction time, whereas addition of Sb O led to fast crystallization of {(Zn(en) (H O) )(Zn(en) )}[Zn(en) V Sb O (H O)] ⋅8.5 H O. In the crystal structure of {Zn(en) } [V Sb O (H O)]⋅3 en⋅10 H O, the en molecules are seen to be attached to the cluster anion through Sb-N bonds. In the structures of the two new compounds obtained, the [V Sb O (H O)] anions are expanded by Zn -centered complexes through Zn-O-V bond formation.
The tuning of the chemical composition in nanostructures is a key aspect to control for the preparation of new multifunctional and highly performing materials. The modification of Cu2-xSe nanocrystals with...
Finding simple, easily
controlled, and flexible synthetic routes
for the preparation of ternary and hybrid nanostructured semiconductors
is always highly desirable, especially to fulfill the requirements
for mass production to enable application to many fields such as optoelectronics,
thermoelectricity, and catalysis. Moreover, understanding the underlying
reaction mechanisms is equally important, offering a starting point
for its extrapolation from one system to another. In this work, we
developed a new and more straightforward colloidal synthetic way to
form hybrid Au–Ag2X (X = S, Se) nanoparticles under
mild conditions through the reaction of Au and Ag2X nanostructured
precursors in solution. At the solid–solid interface between
metallic domains and the binary chalcogenide domains, a small fraction
of a ternary AuAg3X2 phase was observed to have
grown as a consequence of a solid-state electrochemical reaction,
as confirmed by computational studies. Thus, the formation of stable
ternary phases drives the selective hetero-attachment of Au and Ag2X nanoparticles in solution, consolidates the interface between
their domains, and stabilizes the whole hybrid Au–Ag2X systems.
Different gold microstructures have been synthesized by using supramolecular gold(i) organometallic compounds as templates and Ag nanoparticles as reducing agents.
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