31535-89-4Relevant articles and documents
An Active-Site Sulfonate Group Creates a Fast Water Oxidation Electrocatalyst That Exhibits High Activity in Acid
Nash, Aaron G.,Breyer, Colton J.,Vincenzini, Brett D.,Elliott, Gregory I.,Niklas, Jens,Poluektov, Oleg G.,Rheingold, Arnold L.,Smith, Diane K.,Musaev, Djamaladdin G.,Grotjahn, Douglas B.
, p. 1540 - 1545 (2021)
The storage of solar energy in chemical bonds will depend on pH-universal catalysts that are not only impervious to acid, but actually thrive in it. Whereas other homogeneous water oxidation catalysts are less active in acid, we report a catalyst that maintained high electrocatalytic turnover frequency at pH values as low as 1.1 and 0.43 (kcat=1501±608 s?1 and 831±254 s?1, respectively). Moreover, current densities, related to catalytic reaction rates, ranged from 15 to 50 mA cm?2 mM?1 comparable to those reported for state-of-the-art heterogeneous catalysts and 30 to 100 times greater than those measured for two prominent literature homogeneous catalysts at pH 1.1 and 0.43. The catalyst also exhibited excellent durability when a chemical oxidant was used (CeIV, 7400 turnovers, TOF 0.88 s?1). Preliminary computational studies suggest that the unusual active-site sulfonate group acts a proton relay even in strong acid, as intended.
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Halcrow,Kermack
, p. 155 (1946)
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Synthesis of Novel Chiral Phenanthroline Ligands and a Copper Complex
Li, Jian,Tang, Jingjing,Yang, Xueyan,Zhang, Zhipeng
, (2021/11/26)
A novel class of chiral multidentate ligands has been designed and synthesized from the important classic ligand 1,10-phenanthroline and amino acids. The ligands were proven to be able to coordinate with copper(2+) ion by the formation of a novel chiral c
Substituted phenanthrolines as antennae in luminescent EuIII complexes
Akerboom, Sebastiaan,Van Den Elshout, Jos J. M. H.,Mutikainen, Ilpo,Siegler, Maxime A.,Fu, Wen Tian,Bouwman, Elisabeth
supporting information, p. 6137 - 6146 (2014/01/06)
Eight novel europium(III)-based coordination compounds with 1,10-phenanthroline (phen) ligands with a chloro, methoxy, ethoxy, cyano, carboxylic acid, methyl carboxylate, ethyl carboxylate, and amino substituent on the 2-position have been prepared in yields ranging from 43 to 89 %. Additionally, one lanthanum(III) coordination compound of 2-amino-1,10- phenanthroline has been isolated. All compounds have the general formula [Ln(L)2(NO3)3], except for the compound with the carboxylate ligand, which has the formula [Eu(O2Cphen) 3]. Three of the EuIII complexes as well as the La III compound crystal structures have been determined, all of which show similar N4O6 coordination spheres for the Ln III ion. Seven compounds exhibit bright luminescence that is characteristic of EuIII upon irradiation with near-UV radiation, thus indicating efficient ligand-to-metal energy transfer. The complex with 2-amino-1,10-phenanthroline is nonluminescent. The solid-state photoluminescent quantum yields range from 10 to 79 %, and the luminescence lifetimes vary from 0.43 to 1.57 ms. Analysis of the spectral intensities with the Judd-Ofelt theory shows a significant contribution of nonradiative processes that quench the luminescence of the 5D0 level on EuIII. Eight new EuIII complexes with 1,10-phenanthroline ligands substituted on the 2-position have been prepared, analyzed, and the photoluminescence properties studied. The complex with the 2-chloro substituent exhibits bright photoluminescence with a high quantum yield of 78 %. The complex with the 2-amino substituent is nonluminescent. Copyright
