Dicarbonylrhodium(I) complexes of aminophenols and their catalytic carbonylation reaction

Sharma, Manab; Sarmah, Bhaskar; Bhattacharyya, Pradip; Deka, Ramesh C.; Dutta, Dipak Kumar

doi:10.1002/aoc.1193

Cited by 8 publications

(2 citation statements)

References 44 publications

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“…Thus, it would be reasonable to explore the electronic interaction between the single-metal site and the surface groups based on the molecular model of [Rh(CO) 2 I 2 (OAC)] − . Moreover, carbonyl groups as strong electron-donating ligands are also constructive to increase the nucleophilicity of the Rh center and promote the reaction. − …”

Section: Results and Discussionmentioning

confidence: 99%

Constructing Efficient Single Rh Sites on Activated Carbon via Surface Carbonyl Groups for Methanol Carbonylation

et al. 2020

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Heterogeneous single-metal-site catalysts have been drawing increasing interests in the field of academy and industry because of the comparable catalytic activity with homogeneous catalyst and easy separation.Here, an efficiently heterogeneous single-site Rh catalyst on activated carbon (Rh 1 /AC) was constructed, which performs three times activity than the corresponding homogeneous catalyst for methanol carbonylation. Experimental data reveals that the apparent activation energy on the Rh 1 /AC catalyst is 0.91 eV, far less than 1.54 eV of its homogeneous counterpart. Ex situ EXAFS confirms the molecular configuration of a single Rh site. DFT calculation demonstrates that the electron-donating carbonyl group on the surface of the support possesses the precedence to accommodate the singlesite Rh ions. Furthermore, difference charge density verifies that the coordinative bond between a single metal ion and a carbonyl group enhances the electronic density of the central Rh atom, consequently lowering the energy barrier of the rate-determining step of CH 3 I oxidative addition. Together with the atomic dispersion, as well as the electronic interaction between a single Rh ion and carbonyl groups, the Rh 1 /AC catalyst performs superior activity than homogeneous systems.

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Section: Results and Discussionmentioning

confidence: 99%

Constructing Efficient Single Rh Sites on Activated Carbon via Surface Carbonyl Groups for Methanol Carbonylation

et al. 2020

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“…For 5 − 10 wt% loading of ZnO in the polymer nanocomposite the optical band gap decreases. This change is caused by a loading effect of ZnO, namely a compositional change in the polymer blend 25. However, an…”

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confidence: 99%

Electrical properties and thermal degradation of poly(vinyl chloride)/polyvinylidene fluoride/ZnO polymer nanocomposites

Pandey

Joshi

Mukherjee

et al. 2016

Polymer International

102

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In this work, polymer nanocomposites consisting of a poly(vinyl chloride) (PVC) and polyvinylidene fluoride (PVDF) polymer network with ZnO nanoparticles as a dopant were prepared by solution casting. An XRD study of the PVC/PVDF/ZnO polymer nanocomposites shows predominantly sharp and high intensity peaks. However, the intensity and sharpness of the XRD peaks decreases with further increment in loading of ZnO (wt%), which reveals a proper intercalation of ZnO nanoparticles within the PVC/PVDF polymer system. Fourier transform infrared spectroscopy has been used to verify the chemical compositional change as a function of ZnO nanoparticle loading. TGA analysis clearly describes the thermal degradation of the pure polymer and polymer nanocomposites. The complex dielectric function, AC electrical conductivity and impedance spectra of these nanocomposites were investigated over the frequency range from 10 Hz to 35 MHz. These spectra were studied with respect to the Wagner − Maxwell − Sillars phenomenon in the low frequency region. Nyquist plots of the PVC/PVDF/ZnO nanocomposites were established from impedance measurements. The temperature-dependent DC ionic conductivity obtained from the Nyquist plots follows Arrhenius behaviour.

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Carbonylation of Methanol: A Versatile Reaction

Dutta¹

2022

The Chemical Transformations of C1 Compounds

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Dicarbonylrhodium(I) complexes of aminophenols and their catalytic carbonylation reaction

Cited by 8 publications

References 44 publications

Constructing Efficient Single Rh Sites on Activated Carbon via Surface Carbonyl Groups for Methanol Carbonylation

Constructing Efficient Single Rh Sites on Activated Carbon via Surface Carbonyl Groups for Methanol Carbonylation

Electrical properties and thermal degradation of poly(vinyl chloride)/polyvinylidene fluoride/ZnO polymer nanocomposites

Carbonylation of Methanol: A Versatile Reaction

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