Results 81 to 90 of about 596,435 (207)

Light-Driven Hydrogen Production from Aqueous Solutions Based on a New Dubois-Type Nickel Catalyst [PDF]

, 2017
In this work, we report a new photocatalytic system that links multifunctional semiconductor nanocrystals with emerging water-soluble molecular catalysts made of earth-abundant elements for H2 generation [Ni(P2RN2R′)2(BF4)2]4−, R = Ph, R′ = [PhSO3]− (NiS)
Huang, J., Yang, S., Zhou, Y.
core   +1 more source

Metal-free catalysis based on nitrogen-doped carbon nanomaterials: a photoelectron spectroscopy point of view

Beilstein Journal of Nanotechnology, 2018
In this review, we discuss the use of doped carbon nanomaterials in catalysis, a subject that is currently intensively studied. The availability of carbon nanotubes since the 1990’s and of graphene ten years later prompted the development of novel ...
Mattia Scardamaglia, Carla Bittencourt
doaj   +1 more source

Metal-free synthesis of phosphinoylchroman-4-ones via a radical phosphinoylation–cyclization cascade mediated by K2S2O8

Beilstein Journal of Organic Chemistry, 2020
A variety of chroman-4-ones bearing phosphine oxide motifs were conveniently synthesized from readily available diphenylphosphine oxides and alkenyl aldehydes via a metal-free tandem phosphinoylation/cyclization protocol.
Qiang Liu, Weibang Lu, Guanqun Xie, Xiaoxia Wang   +3 more
doaj   +1 more source

Charge Transport Properties of a Metal-free Phthalocyanine Discotic Liquid Crystal

, 2006
Discotic liquid crystals can self-align to form one-dimensional semiconducting wires, many tens of microns long. In this letter, we describe the preparation of semiconducting films where the stacking direction of the disc-like molecules is perpendicular ...
Adriaenssens, G. J., Benkhedir, M. L., de Cupere, V., Deibel, C., Geerts, Y., Heremans, P., Janssen, D.   +6 more
core   +1 more source

The Formation Rates of Population III Stars and Chemical Enrichment of Halos during the Reionization Era

, 2009
[abridged] The First Stars in the Universe form out of pristine primordial gas clouds that have been radiatively cooled to a few hundreds of degrees Kelvin either via molecular or atomic (Lyman-Alpha) hydrogen lines.
Bromm, Cen, Ciardi, Clark, Couchman, Furlanetto, Furlanetto, Galli, Greif, Haiman, Haiman, Haiman, Heger, Heitmann, Hui, Kitayama, Kitayama, Komatsu ., Lukić, Lynden Bell, Machacek, Mackey, Massimo Stiavelli, Michele Trenti, Naoz, O'Shea, O'Shea, Oesch, Omukai, Omukai, Ostriker, Peebles, Peimbert, Ricotti, Scannapieco, Shull, Smith, Spergel, Stiavelli, Tegmark, Tornatore, Trenti, Trenti, Tumlinson, Tumlinson, Tumlinson, Venkatesan, Warren, Whalen, Whalen, Wise, Wise, Wyithe, Wyithe, Yoshida, Yoshida   +55 more
core   +1 more source

Rest-frame ultraviolet-to-optical spectral characteristics of extremely metal-poor and metal-free galaxies

, 2011
Finding the first generation of galaxies in the early Universe is the greatest step forward for understanding galaxy formation and evolution. For strategic survey of such galaxies and interpretation of the obtained data, this paper presents an ...
Akio K. Inoue, Anders, Anders, Beers, Bouwens, Bouwens, Bouwens, Bunker, Calzetti, Dopita, Dunlop, Erb, Erb, Ferland, Finkelstein, Finkelstein, Gallerani, Inoue, Inoue, Inoue, Inoue, Inoue, Iwata, Izotov, Izotov, Jimenez, Komiya, Lehnert, Leitherer, Maiolino, Malhotra, Mannucci, McLure, Nagao, Neufeld, Ono, Osterbrock, Pettini, Raiter, Salpeter, Schaerer, Schaerer, Schaerer, Schaerer, Shapley, Siana, Taniguchi, Yan, Zackrisson   +48 more
core   +1 more source

Aminothiolation of alkenes with azoles and Bunte salts

Frontiers in Chemistry
We have developed an intermolecular aminothiolation of simple olefins using Bunte salt as a thiolating agent. This protocol produces thiyl free radicals under PIDA oxidation conditions, eliminating the need for transition-metal catalysts.
Bingqing Ouyang, Xing Chai, Zhe Li, Chunling Zhang, Xingmei Liu   +4 more
doaj   +1 more source

Probing Population III Stars in Galaxy IOK-1 at z = 6.96 through He II Emission

, 2011
The He II \lambda 1640 emission line has been suggested as a direct probe of Population III (Pop III) stars at high-redshift, since it can arise from highly energetic ionizing photons associated with hot, metal free stars.
Bessel, Bouwens, Bouwens, Bromm, Casertano, Dawson, de Mello, Ekström, Gnedin, Koekemoer, Komatsu, Kudritzki, Mackey, Madau, Nagao, Nagao, Oesch, Oh, Ouchi, O’Shea, Peng, Prescott, Scannapieco, Scannapieco, Shapley, Smith, Steidel, Steidel, Trenti, Tumlinson, Tumlinson, Tumlinson, Whalen, Yan, Yoshida   +34 more
core   +1 more source

Visible Light-Mediated Monofluoromethylation/Acylation of Olefins by Dual Organo-Catalysis

Molecules
Monofluoromethyl (CH2F) motifs exhibit unique bioactivities and are considered privileged units in drug discovery. The radical monofluoromethylative difunctionalization of alkenes stands out as an appealing approach to access CH2F-containing compounds ...
Jiuli Xia, Yunliang Guo, Zhiguang Lv, Jiaqiong Sun, Guangfan Zheng, Qian Zhang   +5 more
doaj   +1 more source

Homogeneous CO Hydrogenation: Dihydrogen Activation Involves a Frustrated Lewis Pair Instead of a Platinum Complex [PDF]

, 2010
During a search for conditions appropriate for Pt-catalyzed CO reduction using dihydrogen directly, metal-free conditions were discovered instead.
Bercaw, John E., Labinger, Jay A., Miller, Alexander J. M.   +2 more
core   +1 more source