Influence of bidentate phosphine ligands on the chemistry of [FeFe]‐hydrogenase model: insight into molecular structures and electrochemical characteristics

2020 ◽  
Vol 34 (11) ◽  
Author(s):  
Mohammad El‐khateeb ◽  
Hassan Abul‐Futouh ◽  
Hadil Alshurafa ◽  
Helmar Görls ◽  
Wolfgang Weigand
Keyword(s):  
Phosphine Ligands ◽  
Molecular Structures ◽  
Electrochemical Characteristics ◽  
Bidentate Phosphine ◽  
Insight Into

Toward a Tunable Synthetic [FeFe]-Hydrogenase H-Cluster Mimic Mediated by Perylene Monoimide Model Complexes: Insight into Molecular Structures and Electrochemical Characteristics

2018 ◽  
Vol 37 (19) ◽  
pp. 3278-3285 ◽  
Author(s):  
Hassan Abul-Futouh ◽  
Artem Skabeev ◽  
Davide Botteri ◽  
Yulian Zagranyarski ◽  
Helmar Görls ◽  
...  
Keyword(s):  
Molecular Structures ◽  
Electrochemical Characteristics ◽  
Model Complexes ◽  
Insight Into

New adducts of silver(I) halides, AgX (X = Cl, Br), with bidentate phosphine ligands: syntheses and molecular structures of [Ag3(μ3-Cl)2(μ-dppm)3][PF6], [Ag3(μ3-Br)2(μ-dppm)3][AgBr2], {[Et4N][Ag2 (μ-Br)3(μ-dppe)]}n, [Et4N]2[(AgCl2)2(μ-dppe)], and [(AgCl)2(μ-dppp)2]

2017 ◽  
Vol 72 (5) ◽  
pp. 327-334
Author(s):  
Ting-Ting Qian ◽  
Yu-Feng Xie ◽  
Hua-Tian Shi ◽  
Ai-Quan Jia ◽  
Qian-Feng Zhang
Keyword(s):  
Membered Ring ◽  
Phosphine Ligands ◽  
Molecular Structures ◽  
Anionic Complex ◽  
Polymeric Complex ◽  
X Ray Diffraction ◽  
Neutral Complex ◽  
X Ray ◽  
Trigonal Bipyramidal ◽  
Bidentate Phosphine

AbstractInteraction of AgCl with bis(diphenylphosphino)methane (dppm) in THF/MeCN in the presence of K[PF6] or [Et4N]Br afforded typical trinuclear cationic trigonal-bipyramidal complexes [Ag3(μ3-Cl)2(μ-dppm)3][PF6] (1) or [Ag3(μ3-Br)2(μ-dppm)3][AgBr2] (2), respectively. Treatment of AgBr with bis(diphenylphosphino)ethane (dppe) in THF/MeCN in the presence of [Et4N]Br gave a polymeric complex {[Et4N][Ag2(μ-Br)3(μ-dppe)]}n (3) with a dinuclear {Ag2(μ-Br)3} core. The reaction of AgCl with dppe or bis(diphenylphosphino)propane (dppp) in THF/MeCN in the presence of [Et4N]Cl resulted in the isolation of a dinuclear anionic complex [Et4N]2[(AgCl2)2(μ-dppe)] (4) with one μ-dppe bridge or a dinuclear neutral complex [(AgCl)2(μ-dppp)2] (5) with two μ-dppp bridges and a 12-membered ring, respectively. The structures of complexes 1–5 with the bidentate phosphine ligands were determined by single-crystal X-ray diffraction.

scholarly journals Discoloration of Historical Plastic Objects: New Insight into the Degradation of β-Naphthol Pigment Lakes

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2278
Author(s):  
Anna Micheluz ◽  
Eva Mariasole Angelin ◽  
João Almeida Lopes ◽  
Maria João Melo ◽  
Marisa Pamplona
Keyword(s):  
Light Exposure ◽  
Molecular Structures ◽  
Conservation Science ◽  
Organic Pigment ◽  
Organic Pigments ◽  
Before And After ◽  
The Individual ◽  
Determining Factor ◽  
Insight Into ◽  
Historical Samples

Light is a determining factor in the discoloration of plastics, and photodegradation processes can affect the molecular structures of both the polymer and colorants. Limited studies focused on the discoloration of heritage plastics in conservation science. This work investigated the discoloration of red historical polyethylene (PE) objects colored with PR 48:2 and PR 53:1. High-density and low-density PE reference polymers, neat pigment powders, and historical samples were assessed before and after accelerated photoaging. The applied methodology provided insight into the individual light-susceptibility of polyethylenes, organic pigment lakes, and their combined effect in the photoaging of historical plastic formulations. After light exposure, both PE references and historical samples yellowed, PR53:1 faded, and PR 48:2 darkened; however, both organic pigments faded severely in the historical samples. This highlights the role played by the plastic binder likely facilitating the pigment photofading. Fourier transform infrared spectroscopy and mass spectrometry techniques—EGA-MS, PY-GC/MS, and TD-GC/MS—were successfully employed for characterizing the plastic formulations and degradation. The identification of phthalic compounds in both aged β-naphthol powders opens new venues for studies on their degradation. This work’s approach and analytical methods in studying the discoloration of historical plastics are novel, proving their efficacy, reliability, and potentiality.

Mono- and Bidentate Phosphine Ligands in the Palladium-Catalyzed Methyl Acrylate Dimerization

2003 ◽  
Vol 345 (3) ◽  
pp. 402-409 ◽  
Author(s):  
Jörg Zimmermann ◽  
Igor Tkatchenko ◽  
Peter Wasserscheid
Keyword(s):  
Methyl Acrylate ◽  
Phosphine Ligands ◽  
Palladium Catalyzed ◽  
Bidentate Phosphine

Coordination chemistry of bidentate phosphine ligands with hydrogen-bonding arms: Picket-fence rhodium complexes

Polyhedron ◽  
2014 ◽  
Vol 69 ◽  
pp. 156-159 ◽  
Author(s):  
Ilknur Babahan ◽  
James T. Engle ◽  
Nishant Kumar ◽  
Christopher J. Ziegler ◽  
Li Jia
Keyword(s):  
Hydrogen Bonding ◽  
Coordination Chemistry ◽  
Phosphine Ligands ◽  
Rhodium Complexes ◽  
Picket Fence ◽  
Bidentate Phosphine
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