4 research outputs found

    Four Alkoxohexavanadate-Based Pd-Polyoxovanadates as Robust Heterogeneous Catalysts for Oxidation of Benzyl-Alkanes

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    Four alkoxohexavanadate-based Pd-POVs [Pd­(dpa)­(acac)]<sub>2</sub>­[V<sub>6</sub>O<sub>13</sub>(OMe)<sub>6</sub>] (<b>1</b>), [Pd­(dpa)­(acac)]<sub>2</sub>­[V<sub>6</sub>O<sub>11</sub>­(OMe)<sub>8</sub>] (<b>2</b>), [Pd­(dpa)­(acac)]<sub>2</sub>­[V<sub>6</sub>O<sub>11</sub>­(OMe)<sub>8</sub>]­·H<sub>2</sub>O (<b>3</b>), and [Pd­(DMAP)<sub>2</sub>­(acac)]<sub>2</sub>­[V<sub>6</sub>O<sub>11</sub>­(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

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    Four alkoxohexavanadate-based Pd-POVs [Pd­(dpa)­(acac)]<sub>2</sub>­[V<sub>6</sub>O<sub>13</sub>(OMe)<sub>6</sub>] (<b>1</b>), [Pd­(dpa)­(acac)]<sub>2</sub>­[V<sub>6</sub>O<sub>11</sub>­(OMe)<sub>8</sub>] (<b>2</b>), [Pd­(dpa)­(acac)]<sub>2</sub>­[V<sub>6</sub>O<sub>11</sub>­(OMe)<sub>8</sub>]­·H<sub>2</sub>O (<b>3</b>), and [Pd­(DMAP)<sub>2</sub>­(acac)]<sub>2</sub>­[V<sub>6</sub>O<sub>11</sub>­(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

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    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

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    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
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