The Experts below are selected from a list of 249 Experts worldwide ranked by ideXlab platform
Habib Nasri - One of the best experts on this subject based on the ideXlab platform.
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Effect of the coordination of π-acceptor 4-Cyanopyridine ligand on the structural and electronic properties of meso-tetra(para-methoxy) and meso-tetra(para-chlorophenyl) porphyrin cobalt(II) coordination compounds. Application in the catalytic degrad
RSC Advances, 2020Co-Authors: Mouhieddinne Guergueb, Ilona Turowska-tyrk, Soumaya Nasri, Jihed Brahmi, Frédérique Loiseau, Florian Molton, Thierry Roisnel, Vincent Guérineau, Kaïss Aouadi, Habib NasriAbstract:To examine the influence of both the important π-acceptor character of the 4-Cyanopyridine ligand and the nature of the para-substituted phenyls of meso-porphyrins on the electronic, electrochemical and structural properties of cobaltous metalloporphyrins, we prepared and fully characterized two coordination compounds: the (4-Cyanopyridine)[meso-tetra(para-methoxyphenyl)porphyrinato]cobalt(II) and the (4-Cyanopyridine)[meso-tetra(para-chlorophenyl)porphyrinato]cobalt(II) with the [CoII(TMPP)(4-CNpy)] and [CoII(TClPP)(4-CNpy)] formulas (complexes 1–2). The solution structures of compounds 1–2 were confirmed by 1H NMR spectroscopy and mass spectrometry methods. They were further characterized by cyclic voltammetry and photoluminescence studies. The X-ray molecular structure data show that the Co-TClPP-4-NCpy derivative (2) exhibits high ruffling deformation compared to that of the Co-TMPP-4-CNpy species (1). Notably, the crystal packing of complex 1 shows the formation of Co⋯Co supramolecular dimers with a distance of 5.663 A. As an application of our two cobaltous compounds, an investigation involving complexes 1–2 in the degradation of the methylene blue dye in the presence and absence of H2O2 in aqueous solutions was carried out. These promising results show that 1–2 can be used as catalysts in the degradation processes of dyes.
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Effect of the coordination of pi-acceptor 4-Cyanopyridine ligand on the structural and electronic properties of meso-tetra(para-methoxy) and meso-tetra(para-chlorophenyl) porphyrin cobalt(ii) coordination compounds. Application in the catalytic degra
RSC Advances, 2020Co-Authors: Mouhieddinne Guergueb, Ilona Turowska-tyrk, Soumaya Nasri, Jihed Brahmi, Frédérique Loiseau, Florian Molton, Thierry Roisnel, Vincent Guérineau, Kaïss Aouadi, Habib NasriAbstract:To examine the influence of both the important pi-acceptor character of the 4-Cyanopyridine ligand and the nature of the para-substituted phenyls of meso-porphyrins on the electronic, electrochemical and structural properties of cobaltous metalloporphyrins, we prepared and fully characterized two coordination compounds the (4-Cyanopyridine)[meso-tetra(para-methoxyphenyl)porphyrinato]cobalt(ii) and the (4-Cyanopyridine)[meso-tetra(para-chlorophenyl)porphyrinato]cobalt(ii) with the [Co-II(TMPP)(4-CNpy)] and [Co-II(TClPP)(4-CNpy)] formulas (complexes 1-2). The solution structures of compounds 1-2 were confirmed by H-1 NMR spectroscopy and mass spectrometry methods. They were further characterized by cyclic voltammetry and photoluminescence studies. The X-ray molecular structure data show that the Co-TClPP-4-NCpy derivative (2) exhibits high ruffling deformation compared to that of the Co-TMPP-4-CNpy species (1). Notably, the crystal packing of complex 1 shows the formation of CoMIDLINE HORIZONTAL ELLIPSISCo supramolecular dimers with a distance of 5.663 angstrom. As an application of our two cobaltous compounds, an investigation involving complexes 1-2 in the degradation of the methylene blue dye in the presence and absence of H2O2 in aqueous solutions was carried out. These promising results show that 1-2 can be used as catalysts in the degradation processes of dyes.
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New insights on the electronic, magnetic, electric and molecular structure of a bis-(4-Cyanopyridine) iron(III) complex with the meso-tetrakis(4-methoxyphenyl)porphyrin
Inorganica Chimica Acta, 2019Co-Authors: Leila Ben Haj Hassen, Selma Dhifaoui, Yoann Rousselin, Valérie Marvaud, Christine Stern, Charles E. Schulz, Habib NasriAbstract:We have successfully synthesized and characterized a new low-spin iron(III) bis(4-Cyanopyridine) complex with a meso-porphyrin substituted in the para positions of the phenyls by the methoxy group, namely the bis(4-Cyanopyridine)[(meso-tetrakis(4-metoxyphenylporphyrinato)]iron(III) trifluoromethanesulfonate chlorobenzene monosolvate complex with the formula [FeIII(TMPP)(4-CNpy)2]SO3CF3.C6H5Cl (I). This species was characterized through ultraviolet–visible, Fourier-transform infrared and Mossbauer spectroscopy as well as by SQUID magnetometry, cyclic voltammetry, and X-ray crystallography. These characterizations indicated that our synthetic heme model is a low-spin (S = 1/2) coordination compound and especially shows that the structural, electronic and the magnetic properties of complex (I) are closely dominated by the presence of the methoxy σ-donor group at the para positions of the meso-porphyrin.
William T Pennington - One of the best experts on this subject based on the ideXlab platform.
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crystal engineering through charge transfer interactions assisted formation of a layered coordination polymer 4 cyanopyridine cadmium ii iodide diiodine
Chemical Communications, 1998Co-Authors: Rosa D Bailey, William T PenningtonAbstract:Formation of a layered coordination polymer (4-Cyanopyridine)cadmium(II) iodide is assisted by n–ς* donor–acceptor interactions between coordinated iodine atoms of the layers and iodine molecules which bridge adjacent layers.
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Crystal engineering through charge transfer interactions; assisted formation of a layered coordination polymer (4-Cyanopyridine)cadmium(II) iodide·diiodine
Chemical Communications, 1998Co-Authors: Rosa D Bailey, William T PenningtonAbstract:Formation of a layered coordination polymer (4-Cyanopyridine)cadmium(II) iodide is assisted by n–ς* donor–acceptor interactions between coordinated iodine atoms of the layers and iodine molecules which bridge adjacent layers.
Rosa D Bailey - One of the best experts on this subject based on the ideXlab platform.
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crystal engineering through charge transfer interactions assisted formation of a layered coordination polymer 4 cyanopyridine cadmium ii iodide diiodine
Chemical Communications, 1998Co-Authors: Rosa D Bailey, William T PenningtonAbstract:Formation of a layered coordination polymer (4-Cyanopyridine)cadmium(II) iodide is assisted by n–ς* donor–acceptor interactions between coordinated iodine atoms of the layers and iodine molecules which bridge adjacent layers.
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Crystal engineering through charge transfer interactions; assisted formation of a layered coordination polymer (4-Cyanopyridine)cadmium(II) iodide·diiodine
Chemical Communications, 1998Co-Authors: Rosa D Bailey, William T PenningtonAbstract:Formation of a layered coordination polymer (4-Cyanopyridine)cadmium(II) iodide is assisted by n–ς* donor–acceptor interactions between coordinated iodine atoms of the layers and iodine molecules which bridge adjacent layers.
Xu Cheng - One of the best experts on this subject based on the ideXlab platform.
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lewis acid catalyzed selective reductive decarboxylative pyridylation of n hydroxyphthalimide esters synthesis of congested pyridine substituted quaternary carbons
ACS Catalysis, 2019Co-Authors: Liuzhou Gao, Jia Cao, Guoqiang Wang, Hui Chen, Xueting Liu, Xu ChengAbstract:A practical and efficient Lewis acid-catalyzed radical–radical coupling reaction of N-hydroxyphthalimide esters and 4-Cyanopyridines with inexpensive bis(pinacolato)diboron as reductant has been de...
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Perfluoroalkylative pyridylation of alkenes via 4-Cyanopyridine-boryl radicals
Chemical science, 2019Co-Authors: Jia Cao, Guoqiang Wang, Liuzhou Gao, Hui Chen, Xueting Liu, Xu ChengAbstract:A metal-free and photo-free method for the perfluoroalkylative pyridylation of alkenes has been developed via a combination of computational and experimental studies. Density functional theory calculations and control experiments indicate that the homolysis of Rf−X (X = Br, I) bonds by the 4-Cyanopyridine-boryl radicals in situ generated from 4-Cyanopyridine and B2pin2 is the key step. Sequential addition of Rf radicals to alkenes and the selective cross-coupling of the resulting alkyl radicals and 4-Cyanopyridine-boryl radicals gives alkene difunctionalization products with a quaternary carbon center. This method exhibits a broad substrate scope and good functional group compatibility.
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metal free synthesis of c 4 substituted pyridine derivatives using pyridine boryl radicals via a radical addition coupling mechanism a combined computational and experimental study
Journal of the American Chemical Society, 2017Co-Authors: Guoqiang Wang, Jia Cao, Liuzhou Gao, Xu Cheng, Wenxin Chen, Wenhao HuangAbstract:Density functional theory investigations revealed that the pyridine-boryl radical generated in situ using 4-Cyanopyridine and bis(pinacolato)diboron could be used as a bifunctional “reagent”, which serves as not only a pyridine precursor but also a boryl radical. With the unique reactivity of such radicals, 4-substituted pyridine derivatives could be synthesized using α,β-unsaturated ketones and 4-Cyanopyridine via a novel radical addition/C—C coupling mechanism. Several controlled experiments were conducted to provide supportive evidence for the proposed mechanism. In addition to enones, the scope could be extended to a wide range of boryl radical acceptors, including various aldehydes and ketones, aryl imines and alkynones. Lastly, this transformation was applied in the late-stage modification of a complicated pharmaceutical molecule.
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Metal-Free Synthesis of C‑4 Substituted Pyridine Derivatives Using Pyridine-boryl Radicals via a Radical Addition/Coupling Mechanism: A Combined Computational and Experimental Study
2017Co-Authors: Guoqiang Wang, Jia Cao, Liuzhou Gao, Wenxin Chen, Wenhao Huang, Xu ChengAbstract:Density functional theory investigations revealed that the pyridine-boryl radical generated in situ using 4-Cyanopyridine and bis(pinacolato)diboron could be used as a bifunctional “reagent”, which serves as not only a pyridine precursor but also a boryl radical. With the unique reactivity of such radicals, 4-substituted pyridine derivatives could be synthesized using α,β-unsaturated ketones and 4-Cyanopyridine via a novel radical addition/CC coupling mechanism. Several controlled experiments were conducted to provide supportive evidence for the proposed mechanism. In addition to enones, the scope could be extended to a wide range of boryl radical acceptors, including various aldehydes and ketones, aryl imines and alkynones. Lastly, this transformation was applied in the late-stage modification of a complicated pharmaceutical molecule
Mouhieddinne Guergueb - One of the best experts on this subject based on the ideXlab platform.
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Effect of the coordination of π-acceptor 4-Cyanopyridine ligand on the structural and electronic properties of meso-tetra(para-methoxy) and meso-tetra(para-chlorophenyl) porphyrin cobalt(II) coordination compounds. Application in the catalytic degrad
RSC Advances, 2020Co-Authors: Mouhieddinne Guergueb, Ilona Turowska-tyrk, Soumaya Nasri, Jihed Brahmi, Frédérique Loiseau, Florian Molton, Thierry Roisnel, Vincent Guérineau, Kaïss Aouadi, Habib NasriAbstract:To examine the influence of both the important π-acceptor character of the 4-Cyanopyridine ligand and the nature of the para-substituted phenyls of meso-porphyrins on the electronic, electrochemical and structural properties of cobaltous metalloporphyrins, we prepared and fully characterized two coordination compounds: the (4-Cyanopyridine)[meso-tetra(para-methoxyphenyl)porphyrinato]cobalt(II) and the (4-Cyanopyridine)[meso-tetra(para-chlorophenyl)porphyrinato]cobalt(II) with the [CoII(TMPP)(4-CNpy)] and [CoII(TClPP)(4-CNpy)] formulas (complexes 1–2). The solution structures of compounds 1–2 were confirmed by 1H NMR spectroscopy and mass spectrometry methods. They were further characterized by cyclic voltammetry and photoluminescence studies. The X-ray molecular structure data show that the Co-TClPP-4-NCpy derivative (2) exhibits high ruffling deformation compared to that of the Co-TMPP-4-CNpy species (1). Notably, the crystal packing of complex 1 shows the formation of Co⋯Co supramolecular dimers with a distance of 5.663 A. As an application of our two cobaltous compounds, an investigation involving complexes 1–2 in the degradation of the methylene blue dye in the presence and absence of H2O2 in aqueous solutions was carried out. These promising results show that 1–2 can be used as catalysts in the degradation processes of dyes.
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Effect of the coordination of pi-acceptor 4-Cyanopyridine ligand on the structural and electronic properties of meso-tetra(para-methoxy) and meso-tetra(para-chlorophenyl) porphyrin cobalt(ii) coordination compounds. Application in the catalytic degra
RSC Advances, 2020Co-Authors: Mouhieddinne Guergueb, Ilona Turowska-tyrk, Soumaya Nasri, Jihed Brahmi, Frédérique Loiseau, Florian Molton, Thierry Roisnel, Vincent Guérineau, Kaïss Aouadi, Habib NasriAbstract:To examine the influence of both the important pi-acceptor character of the 4-Cyanopyridine ligand and the nature of the para-substituted phenyls of meso-porphyrins on the electronic, electrochemical and structural properties of cobaltous metalloporphyrins, we prepared and fully characterized two coordination compounds the (4-Cyanopyridine)[meso-tetra(para-methoxyphenyl)porphyrinato]cobalt(ii) and the (4-Cyanopyridine)[meso-tetra(para-chlorophenyl)porphyrinato]cobalt(ii) with the [Co-II(TMPP)(4-CNpy)] and [Co-II(TClPP)(4-CNpy)] formulas (complexes 1-2). The solution structures of compounds 1-2 were confirmed by H-1 NMR spectroscopy and mass spectrometry methods. They were further characterized by cyclic voltammetry and photoluminescence studies. The X-ray molecular structure data show that the Co-TClPP-4-NCpy derivative (2) exhibits high ruffling deformation compared to that of the Co-TMPP-4-CNpy species (1). Notably, the crystal packing of complex 1 shows the formation of CoMIDLINE HORIZONTAL ELLIPSISCo supramolecular dimers with a distance of 5.663 angstrom. As an application of our two cobaltous compounds, an investigation involving complexes 1-2 in the degradation of the methylene blue dye in the presence and absence of H2O2 in aqueous solutions was carried out. These promising results show that 1-2 can be used as catalysts in the degradation processes of dyes.
