4 research outputs found
Four Alkoxohexavanadate-Based Pd-Polyoxovanadates as Robust Heterogeneous Catalysts for Oxidation of Benzyl-Alkanes
Four alkoxohexavanadate-based Pd-POVs
[PdÂ(dpa)Â(acac)]<sub>2</sub>Â[V<sub>6</sub>O<sub>13</sub>(OMe)<sub>6</sub>] (<b>1</b>), [PdÂ(dpa)Â(acac)]<sub>2</sub>Â[V<sub>6</sub>O<sub>11</sub>Â(OMe)<sub>8</sub>] (<b>2</b>), [PdÂ(dpa)Â(acac)]<sub>2</sub>Â[V<sub>6</sub>O<sub>11</sub>Â(OMe)<sub>8</sub>]·H<sub>2</sub>O (<b>3</b>), and [PdÂ(DMAP)<sub>2</sub>Â(acac)]<sub>2</sub>Â[V<sub>6</sub>O<sub>11</sub>Â(OMe)<sub>8</sub>]·H<sub>2</sub>O (<b>4</b>) (POV = polyoxovanadate; dpa = 2,2′-dipyridine
amine; DMAP = 4-dimethylaminopyridine; acac = acetylacetone anion)
have been synthesized and fully characterized by single crystal X-ray
diffraction and powder X-ray diffraction analyses, Fourier transform
infrared spectroscopy, element analyses, and X-ray photoelectron spectroscopy.
In <b>1</b>–<b>4</b>, Pd complexes and hexavanadate
anions are assembled through electrostatic interactions. Interestingly,
the [V<sub>6</sub>O<sub>11</sub>(OMe)<sub>8</sub>]<sup>2–</sup> cores in <b>2</b> and <b>3</b> are a pair of isomers
that can be isolated by controlling crystallization temperature. Moreover,
to the best of our knowledge, the {V6} core in <b>3</b> represents
a new octamethoxyhexavanadates cluster. It is notable that compounds <b>1</b>–<b>4</b> exhibit excellent heterogeneous catalytic
performance in the oxidation of benzyl-alkanes with <i>t</i>-butylhydroperoxide as oxidant. Among them, the catalytic activity
of <b>1</b> (conv. and selec. up to 99%, respectively) outperforms
others and can be reused without losing its activity
Four Alkoxohexavanadate-Based Pd-Polyoxovanadates as Robust Heterogeneous Catalysts for Oxidation of Benzyl-Alkanes
Four alkoxohexavanadate-based Pd-POVs
[PdÂ(dpa)Â(acac)]<sub>2</sub>Â[V<sub>6</sub>O<sub>13</sub>(OMe)<sub>6</sub>] (<b>1</b>), [PdÂ(dpa)Â(acac)]<sub>2</sub>Â[V<sub>6</sub>O<sub>11</sub>Â(OMe)<sub>8</sub>] (<b>2</b>), [PdÂ(dpa)Â(acac)]<sub>2</sub>Â[V<sub>6</sub>O<sub>11</sub>Â(OMe)<sub>8</sub>]·H<sub>2</sub>O (<b>3</b>), and [PdÂ(DMAP)<sub>2</sub>Â(acac)]<sub>2</sub>Â[V<sub>6</sub>O<sub>11</sub>Â(OMe)<sub>8</sub>]·H<sub>2</sub>O (<b>4</b>) (POV = polyoxovanadate; dpa = 2,2′-dipyridine
amine; DMAP = 4-dimethylaminopyridine; acac = acetylacetone anion)
have been synthesized and fully characterized by single crystal X-ray
diffraction and powder X-ray diffraction analyses, Fourier transform
infrared spectroscopy, element analyses, and X-ray photoelectron spectroscopy.
In <b>1</b>–<b>4</b>, Pd complexes and hexavanadate
anions are assembled through electrostatic interactions. Interestingly,
the [V<sub>6</sub>O<sub>11</sub>(OMe)<sub>8</sub>]<sup>2–</sup> cores in <b>2</b> and <b>3</b> are a pair of isomers
that can be isolated by controlling crystallization temperature. Moreover,
to the best of our knowledge, the {V6} core in <b>3</b> represents
a new octamethoxyhexavanadates cluster. It is notable that compounds <b>1</b>–<b>4</b> exhibit excellent heterogeneous catalytic
performance in the oxidation of benzyl-alkanes with <i>t</i>-butylhydroperoxide as oxidant. Among them, the catalytic activity
of <b>1</b> (conv. and selec. up to 99%, respectively) outperforms
others and can be reused without losing its activity
One-Pot Construction of Heteroarylation/Esterification Products of Acrylic Acids via Iridium(III)-Catalyzed C–H Activation
A carboxylate-assisted iridium(III)-catalyzed regioselective
C(sp2)–H heteroarylation/esterification reaction
of acrylic
acid is disclosed herein for the first time. This catalytic protocol
tolerates various α-substituted, β-substituted, and α,
β-disubstituted acrylic acids as well as heteroaromatic boronates
well. The resulting 3,4-dihydro-2H-pyran-6-carboxylic
acid derivative 3r highlighted the AIE-active luminophore
with multiple emission signal properties and a high quantum yield
of 28%, exhibiting the potential application of this methodology for
the synthesis of nitrogen-containing organic functional materials
Cation-Induced Synthesis of New Polyoxopalladates
Seven polyoxopalladate compounds, [Pd<sub>15</sub>(SeO<sub>3</sub>)<sub>10</sub>(μ<sub>3</sub>-O)<sub>10</sub>]<sup>10–</sup>, with Na<sup>+</sup> (<b>1</b>) and K<sup>+</sup> (<b>2</b>) as counterions, and Na<sub>6</sub>[M<sup>II</sup>{Pd<sub>12</sub>(SeO<sub>3</sub>)<sub>8</sub>(μ<sub>4</sub>-O)<sub>8</sub>}]·<i>n</i>H<sub>2</sub>O (M = Co (<b>3</b>), Zn (<b>4</b>), Ni (<b>5</b>), Cu (<b>6</b>), Mn (<b>7</b>); <i>n</i> = 7–9), have been prepared and characterized by
SXRD, FT-IR, UV–vis, EA, TGA, and ESI-MS. These compounds comprise
two distinct cluster configurations, {Pd<sub>15</sub>} and {M<sup>II</sup>Pd<sub>12</sub>}, which reveals the possibility of obtaining
desired noble metal clusters with a certain nuclearity by using different
cations as potential structural directing or template agents in synthesis.
All compounds showed apparent absorptions in the visible light region,
while <b>3</b> and <b>7</b> were found to show paramagnetic
behavior typical of mononuclear Co<sup>II</sup> and Mn<sup>II</sup> complexes with zero-field splitting