- Study of an S = 1 NiII pincer electrocatalyst precursor for aqueous hydrogen production based on paramagnetic 1H NMR
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A tridentate NNN NiII complex, shown to be an electrocatalyst for aqueous H2 production at low overpotentials, is studied by using temperature-dependent paramagnetic 1H NMR. The NMR T1 relaxation rates, temperat
- Luca, Oana R.,Konezny, Steven J.,Paulson, Eric K.,Habib, Fatemah,Luthy, Kurt M.,Murugesu, Muralee,Crabtree, Robert H.,Batista, Victor S.
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Read Online
- Redox-controlled polymerization of lactide catalyzed by bis(imino)pyridine iron bis(alkoxide) complexes
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Bis(imino)pyridine iron bis(alkoxide) complexes have been synthesized and utilized in the polymerization of (rac)-lactide. The activities of the catalysts were particularly sensitive to the identity of the initiating alkoxide with more electron-donating alkoxides resulting in faster polymerization rates. The reaction displayed characteristics of a living polymerization with production of polymers that exhibited low molecular weight distributions, linear relationships between molecular weight and conversion, and polymer growth observed for up to fifteen sequential additions of lactide monomer to the polymerization reaction. Mechanistic experiments revealed that iron bis(aryloxide) catalysts initiate polymerization with one alkoxide ligand, while iron bis(alkylalkoxide) catalysts initiate polymerization with both alkoxide ligands. Oxidation of an iron(II) catalyst precursor lead to a cationic iron(III) bis-alkoxide complex that was completely inactive toward lactide polymerization. When redox reactions were carried out during lactide polymerization, catalysis could be switched off and turned back on upon oxidation and reduction of the iron catalyst, respectively.
- Biernesser, Ashley B.,Li, Bo,Byers, Jeffery A.
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Read Online
- Mechanochemical route to graphene-supported iron catalysts for olefin polymerization and in situ formation of carbon/polyolefin nanocomposites
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A facile one-step mechanochemical process converts graphite into highly active graphene-supported iron catalysts for ethylene polymerization and the in situ formation of graphene/polyethylene nanocomposites. Key feature is the dry grinding of graphite in
- Beckert,Bodendorfer,Zhang,Thomann,Mülhaupt
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Read Online
- SELF-ASSEMBLED MICROCAPSULES WITH STIMULI-RESPONSIVE ORGANIC LIGANDS
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Self-assembled organic ligand functionalized microcapsules encapsulating one or more substrates, which release the substrates upon activation with a power source, are provided. Compositions that include these microcapsules, as well as methods of making th
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Page/Page column 54-55
(2020/06/10)
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- One-Pot, One-Step Precatalysts through Mechanochemistry
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The development and implementation of transition-metal-based precatalysts have played crucial roles in modern organic synthesis. However, while the use of such species greatly improves sustainability, their preparative routes often rely on multiple time-,
- Shaw, Thomas E.,Mathivathanan, Logesh,Jurca, Titel
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supporting information
p. 4066 - 4070
(2019/11/03)
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- Mechanochemical routes for the synthesis of acetyl- A nd bis-(imino)pyridine ligands and organometallics
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Organometallic precatalysts play a pivotal role in organic synthesis. However, their preparation often relies on multiple time, energy, and solvent intensive steps, including the synthesis of supporting organic ligand structures, and finally installation
- Shaw, Thomas E.,Shultz, Lorianne R.,Garayeva, Louiza R.,Blair, Richard G.,Noll, Bruce C.,Jurca, Titel
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supporting information
p. 16876 - 16884
(2019/01/03)
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- Determination of zero-field splitting in Co2+ halide complexes with magnetic and far-IR measurements
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Three penta-coordinate Co2+ complexes with halide substitutes were synthesized. Their zero-field splitting (ZFS) parameters were determined by fitting dc magnetic data and far-infrared magneto-transmission spectra. The results gave an unusual c
- Liu, Jia-Jia,Meng, Yin-Shan,Hlavi?ka, Ivo,Orlita, Milan,Jiang, Shang-Da,Wang, Bing-Wu,Gao, Song
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supporting information
p. 7408 - 7411
(2017/07/10)
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- Tandem C-H activation/arylation catalyzed by low-valent iron complexes with bisiminopyridine ligands
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Tandem C-H activation/arylation between unactivated arenes and aryl halides catalyzed by iron complexes that bear redox-active non-innocent bisiminopyridine ligands is reported. Similar reactions catalyzed by first-row transition metals have been shown to involve substrate-based aryl radicals, whereas our catalytic system likely involves ligand-centered radicals. Preliminary mechanistic investigations based on spectroscopic and reactivity studies, in conjunction with DFT calculations, led us to propose that the reaction could proceed through an inner-sphere C-H activation pathway, which is rarely observed in the case of iron complexes. This bielectronic noble-metal-like behavior could be sustained by the redox-active non-innocent bisiminopyridine ligands. A radical choice! A low-valent iron complex with non-innocent bisiminopyridine ligands performs C-H activation/arylation of unactivated aryl compounds (see figure). The reaction likely involves ligand-based radicals, whereas previously reported iron-based systems imply substrate-based radicals.
- Salanouve, Elise,Bouzemame, Ghania,Blanchard, Sebastien,Derat, Etienne,Desage-El Murr, Marine,Fensterbank, Louis
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supporting information
p. 4754 - 4761
(2014/05/06)
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- Enhance the performance of dye-sensitized solar cells by co-sensitization of 2,6-bis(iminoalkyl)pyridine and N719
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Three organic dyes 2,6-bis(iminoalkyl)pyridines [2,6-(2,6-R 2C6H2NCMe)2]C5H 3N (R = methyl, ethyl, isopropyl) (named DM, DE and DP, respectively) were synthesized and assembled onto nanocry
- Wei, Liguo,Yang, Yulin,Fan, Ruiqing,Wang, Ping,Li, Liang,Yu, Jia,Yang, Bin,Cao, Wenwu
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p. 25908 - 25916
(2013/12/04)
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- Biphasic ethylene oligomerization using bis(imino)pyridine cobalt complexes in methyl-butylimidazolium organochloroaluminate ionic liquids
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Several bis(imino)pyridine cobalt (II) complexes have been synthesized and used in ethylene oligomerization in 1-methyl-3-butylimidazolium tetrachloroaluminate (BMI·AlCl4) ionic liquid activated by methylaluminoxane (MAO). The ligand substituti
- Thiele, Daniel,De Souza, Roberto Fernando
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experimental part
p. 83 - 88
(2011/06/27)
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- HYDROSILYLATION CATALYSTS
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Disclosed herein are manganese, iron, cobalt, or nickel complexes containing terdentate pyridine diimine ligands and their use as efficient and selective hydrosilylation catalysts.
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Page/Page column 19-20
(2011/02/24)
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- Hydrosilylation Catalysts
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Disclosed herein are manganese, iron, cobalt, or nickel complexes containing terdentate pyridine diimine ligands and their use as efficient and selective hydrosilylation catalysts.
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- Syntheses, structures, and luminescent properties of copper(II) complexes based on 2,6-bis(imino)pyridyl ligands
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A series of five-coordinated 2,6-bis(imino)pyridyl Cu(II) complexes, [2,6-(ArNCMe)2C5H3NCuCl2· nCH3CN] (Ar = 4-MeC6H4, n = 0.5, Cu1; Ar = 2,6-Et2C6H3/
- Fan, Rui-Qing,Wang, Ping,Yang, Yu-Lin,Zhang, Yan-Jiao,Yin, Yan-Bing,Hasi, Wuliji
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scheme or table
p. 2862 - 2866
(2011/01/07)
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