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Electrocatalytic Oxidation Of Methanol By The [ru3o(oac) 6(py)2(ch3oh)]3+ Cluster: Improving The Metal-ligand Electron Transfer By Accessing The Higher Oxidation States Of A Multicentered System
Get PDFThe [Ru3O(Ac)6(py)2(CH3OH)] + cluster provides an effective electrocatalytic species for the oxidation of methanol under mild conditions. This complex exhibits characteristic electrochemical waves at -1.02, 0.15 and 1.18 V, associated with the Ru3 III,II,II/Ru3 III,III,II/ Ru3 III,III,III/Ru3 IV,III,III successive redox couples, respectively. Above 1.7 V, formation of two Ru IV centers enhances the 2-electron oxidation of the methanol ligand yielding formaldehyde, in agreement with the theoretical evolution of the HOMO levels as a function of the oxidation states. This work illustrates an important strategy to improve the efficiency of the oxidation catalysis, by using a multicentered redox catalyst and accessing its multiple higher oxidation states.331020462050Viertler, H., Gruber, J., Pardini, V.L., (2001) Organic Electrochemistry, p. 621. , Lund, H.Hammerich, O., eds.Marcel Dekker: New York, chap. 17Araki, K., Toma, H.E., (2006) N-4 Macrocyclic Metal Complexes, p. 255. , Zagal, J. H.Bedioui, F.Dodelet, J.-P.Springer: New York, chap. 6Araki, K., Dovidauskas, S., Winnischofer, H., Alexiou, A.D.P., Toma, H.E., (2001) J. Electroanal. Chem., 498, p. 152Dovidauskas, S., Toma, H.E., Araki, K., Sacco, H.C., Iamamoto, Y., (2000) Inorg. Chim. Acta, 305, p. 208Toma, H.E., Araki, K., (2009) Progr. Inorg. Chem., 56, p. 379Kuwabara, I.H., Comninos, F.C.M., Pardini, V.L., Viertler, H., Toma, H.E., (1994) Electrochim. Acta, 39, p. 2401Nunes, G.S., Alexiou, A.D.P., Araki, K., Formiga, A.L.B., Rocha, R.C., Toma, H.E., (2006) Eur. J. Inorg. Chem., p. 1487Nunes, G.S., Alexiou, A.D.P., Toma, H.E., (2008) J. Catal., 260, p. 188Alexiou, A.D.P., Dovidauskas, S., Toma, H.E., (2000) Quim. Nova, 23, p. 785Toma, H.E., Araki, K., Alexiou, A.D.P., Nikolaou, S., Dovidauskas, S., (2001) Coord. Chem. Rev., 219-221, p. 187Davis, S., Drago, R.S., (1988) Inorg. Chem., 27, p. 4759Bilgrien, C., Davis, S., Drago, R.S., (1987) J. Am. Chem. Soc., 109, p. 3786Sieben, J.M., Duarte, M.M.E., Mayer, C.E., (2010) Chem Cat. Chem, 2, p. 182Raoof, J.B., Golikan, A.N., Baghayeri, M., (2010) J. Solid State Electrochem., 14, p. 817Raoof, J.B., Karimi, M.A., Hosseini, S.R., Mangelizadeh, S., (2010) J. Electroanal. Chem., 638, p. 33El-Deab, M.S., (2009) Int. J. Electrochem. Sci., 4, p. 1329Zheng, L., Song, J.F., (2010) J. Solid State Electrochem., 14, p. 43Wu, B.H., Hu, D., Kuang, Y.J., Liu, B., Zhang, X.H., Chen, J.H., (2009) Angew. Chem., Int. Ed., 48, p. 4751Suffredini, H.B., Salazar-Banda, G.R., Avaca, L.A., (2009) J. Sol-Gel Sci. Technol., 49, p. 131Balasubramanian, A., Karthikeyan, N., Giridhar, V.V., (2008) J. Power Sources, 185, p. 670Zhao, H.B., Li, L., Yang, J., Zhang, Y.M., (2008) Electrochem. Commun., 10, p. 1527Zhang, D., Ding, Y., Gao, W., Chen, H.Y., Xia, X.H., (2008) J. Nanosci. Nanotechnol., 8, p. 979Sawyer, D.T., Roberts, J.L., (1974) Experimental Electrochemistry for Chemists, , Wiley: New YorkBaumann, J.A., Salmon, D.J., Wilson, S.T., Meyer, T.J., Hatfield, W.E., (1978) Inorg. Chem., 17, p. 3342Allinger, N.L., (1977) J. Am. Chem. Soc., 99, p. 8127Zerner, M.C., Loew, G.H., Kirchner, R.F., Mueller-Westerhoff, U.T., (1980) J. Am. Chem. Soc., 102, p. 589Formiga, A.L.B., Nogueira, A.F., Araki, K., Toma, H.E., (2008) New J. Chem., 32, p. 1167Longuet-Higgins, H., Pople, J.A., (1955) Proc. Phys. Soc., 68, p. 591Latimer, W.M., (1952) The Oxidation States of the Elements and Their Potentials in Aqueous Solutions, , Prentice-Hall: Englewood Cliffs, 2nd edNicholson, R.S., Shain, I., (1964) Anal. Chem., 36, p. 706Sundholm, G., (1971) Acta Chem. Scand., 25, p. 3188Sundholm, G., (1971) J. Electroanal. Chem., 31, p. 265Nash, T., (1953) Biochemistry, 55, p. 41
A Nitric Oxide Releaser Based On The μ-oxo-hexaacetate-bis(4- Methylpyridine)triruthenium Nitrosyl Complex
No full textThe properties of the trinuclear cluster [Ru3OAc 6(pic)2(NO)]PF6 (pic = 4-methyl pyridine, Ac = acetate ion) and the photochemical behavior of the corresponding molecular films are reported in this paper. In this compound, the unpaired π* electron from NO and the unpaired electron from the π-orbitals of the Ru3O unity are strongly coupled; as a consequence, the changes in electronic distribution associated with the several successive redox states promote dramatic effects in the spectroscopic and electrochemical properties of the nitric oxide ligand and the entire complex. NO release has been observed by light irradiation (φ = 0.038 at 365 nm and φ = 0.019 at 468 nm, in acetonitrile solution), changing the original violet color into deep blue. 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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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