9,418 research outputs found
EXAFS, DFT, light-induced nucleobase binding, and cytotoxicity of the photoactive complex cis-[Ru(bpy)2(CO)Cl]+
No full textThe aqueous photochemistry of cis-[Ru(bpy)2(CO)Cl]+ (1) was investigated at 310 K and under visible light (white) irradiation by NMR and ESI-HR-MS. Complex 1 releases a Cl ligand, coordinates a solvent molecule, and forms the complex cis-[Ru(bpy)2(CO)(H2O)]2+ (2). Also, irradiation experiments were performed in the presence of the nucleobase derivatives 9-ethylguanine (9-EtG) and 9-ethyladenine (9-EtA). Formation of Ru-9-EtG adducts was observed after 3 h irradiation by NMR and HR-MS, while only very small amounts of a Ru-9-EtA adduct could be detected by HR-MS. Solution structural data were obtained by X-ray absorption spectroscopy (XAS) for both 1 and 2. EXAFS gave a Ru−Cl distance of 2.416(7) Å for 1 and a Ru−OH2O distance of 2.102(6) Å for 2. DFT and TDDFT were employed to study the photophysical and photochemical properties of 1. Calculations show that dissociative metal-centered states can be related to the light-induced release of a Cl ligand and subsequent coordination of a solvent molecule. The compound showed no antiproliferative activity in three human carcinoma cell lines (lung, bladder, pancreas) under the testing conditions, either with or without irradiation with UV light
Quaterpyridine Ligands for Panchromatic Ru(II) Dye Sensitizers
No full textA new general synthetic access to carboxylated quaterpyridines (qpy), of interest as ligands for panchromatic dyesensitized solar cell organometallic sensitizers, is presented. The strategic step is a Suzuki−Miyaura cross-coupling reaction,
which has allowed the preparation of a number of representative unsubstituted and alkyl and (hetero)aromatic substituted qpys.
To bypass the poor inherent stability of 2-pyridylboronic acid derivatives, we successfully applied N-methyliminodiacetic acid
(MIDA) boronates as key reagents, obtaining the qpy ligands in good yields up to (quasi)gram quantities. The structural,
spectroscopic (NMR and UV−vis), electrochemical, and electronic characteristics of the qpy have been experimentally and
computationally (DFT) investigated. The easy access to the bis-thiocyanato Ru(II) complex of the parent species of the qpy
series, through an efficient route which bypasses the use of Sephadex column chromatography, is shown. The bis-thiocyanato
Ru(II) complex has been spectroscopically (NMR and UV−vis), electrochemically, and computationally investigated, relating its
properties to those of previously reported Ru(II)−qpy complexes.“This document is the Accepted Manuscript version of a Published Work that appeared in final form in [The Journal of Organic Chemistry], copyright © American Chemical Society after peer review and technical editing by the publisher
Niu peng za yi
No full textBen shu nei rong bao kuo niu peng za yi,Shu zhai za lu,Bing ta za ji deng bu fen,Bao kuo"yuan qi","cong she jiao yun dong tan qi","dui hao ru zuo","kuai huo ban nian","zi ji tiao chu lai"den
Sheldon Hsiao-peng Lu. Transnational Chinese cinemas : identity, nationhood, gender
No full textThis article reviews the book Transnational Chinese Cinemas: Identity, Nationhood, Gender edited by Sheldon Hsiao-peng Lu
Ru- and Co-Catalyzed Intermolecular Carbonyl–Alkyne Metathesis Reactions of 1<i>H</i>‑Indene-1,2,3-triones with Internal Alkynes
No full textThe catalyst-dependent intermolecular carbonyl–alkyne
metathesis
(CAM) reaction of 1H-indene-1,2,3-triones with internal
alkynes was realized using Ru and Co catalysts. 2-(2-Oxo-1,2-diphenylethylidene)-1H-indene-1,3(2H)-dione derivatives were
obtained using a Ru catalyst, whereas S-alkyl 2-(1,3-dioxo-1,3-dihydro-2H-inden-2-ylidene)-2-phenylethanethioates were prepared
using a Co catalyst. These transformations led to the synthesis of
α,β-unsaturated carbonyl compounds with a broad substrate
scope, excellent regiocontrol, and gram-scale amenability. This catalytic
strategy using a Co or Ru catalyst has rarely been described for other
established CAM catalysts
DWDM channel spacing tunable optical TDM carrier from a mode-locked weak-resonant-cavity Fabry-Perot laser diode based fiber ring
No full textChirp and error rate analyses of an optical-injection gain-switching VCSEL based all-optical NRZ-to-PRZ converter
No full textDistributed model-free adaptive predictive control of traffic lights for multiple interconnected intersections
No full textLetterIn this study, a novel data-driven approach, DED-MFAPC, was proposed for traffic light control of multi-intersection networks. In the future, the fuel economy and emissions of vehicles and the case when the traffic lights and vehicle dynamics are simultaneously optimized are worthy of investigation. Another future direction would be calculating the offset of the signals and the cycle time by the data-driven method.Xinfeng Ru, Chenyi Mei, Weiguo Xia, Peng Sh
Compression of 200GHz DWDM channelized TDM pulsed carrier from optically modelocking WRC-FPLD Fiber Ring at 10 GHz
No full textLathrobium yulongense PENG & LI 2012
No full textLathrobium yulongense PENG & LI 2012 Material examined China: 1, Yunnan, 32 km N Lijiang, Maoniuping, 27°10'N, 100°15'E, 3540 m, wet pasture, collected in and under Yak excrements, 16.VI.2007, leg. Hájek & Ružiþka (NMNHP). Comment: The distribution of L. yulongense is probably confined to the Yulongxue Shan in Yunnan. For a distribution map see ASSING (2013d).Published as part of Assing, V. & S, Longwang, 2013, New species and records of Lathrobium from China and Nepal (Coleoptera: Staphylinidae: Paederinae), pp. 1643-1655 in Linzer biologische Beiträge 45 (2) on page 1645, DOI: 10.5281/zenodo.530320
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