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Oxidative Addition Reactions Of I2 With [hir4(co)10-n(pph3)n(μ-pph 2)] (n = 1 And 2) And Crystal And Molecular Structure Of [hir4(μ-i)2(co)7(pph3)(μ- Pph2)]
No full textThe reactions of the cluster compounds [HIr4(CO)10-n(PPh3)n(μ-PPh 2)] [n = 0, (1); 1, (2) and 2, (3)] with I2 have been investigated. Compound 1 does not react, however, the presence of PPh3 in place of CO ligand(s) activates the cluster. Both compounds 2 and 3 react with I2 under mild conditions to give [HIr4(μ-I)2(CO)7(PPh3)(μ- PPh2)] (4), as the result of oxidative addition of I2 and dissociation of two CO ligands, or one CO and one PPh3 ligands, respectively. The molecular structure of 4, determined by an X-ray diffraction study, exhibits a butterfly arrangement of iridium atoms with the wings spanned by a μ-PPh2 ligand, the hinge bridged by a μ-H ligand, two hinge to wing tip edges bridged by iodine atoms and all metal atoms bearing two CO ligands, with the exception of one of the hinge atoms that contains a CO and a PPh3 ligands. This cluster exhibits the shortest average Ir-Ir bond length [2.698(2) Å] observed so far for a derivative of 1 and this is in accord with the relatively high average oxidation state of its metal atoms (+1) for a carbonyl cluster compound.135682686Livotto, F.S., Raithby, P.R., Vargas, M.D., (1993) J. Chem. Soc., Dalton Trans., p. 1797Araujo, M.H., (1995), Ph.D. Thesis, Universidade Estadual de Campinas, BrazilVargas, M.D., Pereira, R.M.S., Braga, D., Grepioni, F., (1993) J. Chem. Soc., Chem. Commun., p. 1008Vargas, M.D., Pereira, R.M.S., Braga, D., Grepioni, F., (1999) J. Braz. Chem. Soc., 10, p. 35Benvenutti, M.H.A., Vargas, M.D., Braga, D., Grepioni, F., Parisini, E., Mann, B.E., (1993) Organometallics, 12, p. 2955Benvenutti, M.H.A., Vargas, M.D., Braga, D., Grepioni, F., Mann, B.E., Naylor, S., (1993) Organometallics, 12, p. 2947Benvenutti, M.H.A., Hitchcock, P.B., Nixon, J.F., Vargas, M.D., (1994) J. Chem. Soc., Chem. Commun., p. 1869Araujo, M.H., Hitchcock, P.B., Nixon, J.F., Vargas, M.D., (1998) J. Braz. Chem. Soc., 9, p. 563Hitchcock, P.B., Nixon, J.F., Vargas, M.D., Ziglio, C.M., (2000) J. Chem. Soc., Dalton Trans., p. 2527Collman, J.P., Hegedus, L.S., Norton, J.R., Finke, R.G., (1987) Principles and Applications of Organometallic Chemistry, 2nd Ed., , University Science Books: Mill Valley, CALivotto, F.S., Raithby, P.R., Vargas, M.D., (1993) J. Chem. Soc., Dalton Trans., p. 1797Sheldrick, G.M., (1997) SHELXL97 - Single Crystal Structure Determination Software, , University of Göttingen, GermanyKeller, E., (1999) SCHAKAL99 - Graphical Representation of Molecular Models, , University of Freiburg, GermanyCarty, A.J., MacLaughlin, S.A., Nucciaroni, D., (1987) Phosphorus 31-NMR Spectroscopy in Stereochemical Analysis, , Verkade, J. G.Quin, L. D., eds, VCH: Deerfield Beach, FL, ch 16Riera, V., Ruiz, M.A., Villafañe, F., Bois, C., Jeannin, Y., (1993) Organometallics, 12, p. 124Johnson, B.F.G., Lewis, J., Nicholls, J.N., Puga, J., Whitmire, K.H., (1983) J. Chem. Soc., Dalton Trans., p. 787Johnson, B.F.G., Lewis, J., Nelson, W.J.H., Nicholls, J.N., Vargas, M.D., (1984) J. Chem. Soc., Dalton Trans., p. 1809Mingos, D.M.P., Wales, D.J., (1990) Introduction to Cluster Chemistry, , Prentice Hall: New JerseyVargas, M.D., Nicholls, J.N., (1986) Adv. Inorg. Radiochem., 30, p. 123Sanati, H., Becalska, A., Ma, A.K., Pomeroy, R.K., (1990) J. Chem. Soc., Chem. Commun., p. 197Hui, J.W.S., Wong, W.T., (1990) Organometallics, 9, p. 132
Synthesis And Structural Characterisation Of [ir4(co)8(ch3)(μ4-η 3-ph2pccph)(μ-pph2)] And Of The Carbonylation Product [ir4(co)8{c(o)ch3}(μ4-η 3-ph2pccph)(μ-pph2)]
Full text linkDeprotonation of [(μ-H)Ir4(CO)10(μ-PPh2)], 1, gives [Ir4(CO)10(μ-PPh2)]- that reacts with Ph2PCCPh and CH3I to afford [Ir4(CO)8(CH3)(μ4-η 3-Ph2PCCPh)(μ-PPh2)], 2 (34%), besides [Ir4(CO)9(μ3-η3-Ph 2PC(H)CPh)(μ-PPh2)] and [(μ-H)Ir4(CO)9(Ph2PC≡CPh)(μ-PPh2)]. Compound 2 was characterised by a single crystal X-ray diffraction analysis and exhibits a flat butterfly of metal atoms, with the Ph2PCCPh ligand interacting with all four Ir atoms and the methyl group bonded terminally to a wingtip Ir atom. Carbonylation of 2 yields initially (25°C, 20 min) a CO addition product that, according to VT 31P{1H} and 13C{1H} studies, exists in solution in the form of two isomers 4A and 4B (8:1), and then (40°C, 7 h), the CO insertion product [Ir4(CO)8{C(O)CH3}-(μ4-η 3-Ph2PCCPh)(μ-PPh2)], 5. The molecular structure of 5, established by an X-ray analysis, is similar to that of 2, except for the acyl group that remains bound to the same Ir atom. The process is reversible at both stages. Treatment of 2 with PPh3 and P(OMe)3 affords the CO substitution products [Ir4(CO)7L(CH3)(μ4-η 3-Ph2PCCPh)(μ-PPh2)] (L = PPh3, 6 and P(OMe)3, 7), instead of the expected CO inserted products. According to the 1H and 31P{1H} NMR studies, the PPh3 derivative 6 exists in the form of two isomers (1:1) that differ with respect to the position of this ligand.1013545Hoffmann, R., (1982) Angew. Chem. Int. Ed. Engl., 21, p. 711Bau, R., Chiang, M.Y., Wei, C.-Y., Garlaschelli, L., Martinengo, S., Koestzle, T.F., (1984) Inorg. Chem., 23, p. 4758Ragaini, F., Porta, F., Demartin, F., (1991) Organometallics, 10, p. 185Albano, V.G., Canziani, F., Ciani, G., Chini, P., Martinengo, S., Manassero, M., Giordano, G., (1978) J. Organomet. Chem., 150, pp. C17Chinara, T., Aoki, K., Yamazaki, H., (1990) J. Organomet. Chem., 353, p. 367Chinara, T., Aoki, K., Yamazaki, H., (1994) J. Organomet. Chem., 473, p. 273González-Moraga, (1993) Cluster Chemistry, , Chapter 3, Springer-Verlag, BerlinBenvenutti, M.H.A., Vargas, M.D., Braga, D., Grepioni, F., Parisini, E., Mann, B.E., (1993) Organometallics, 12, p. 2955Benvenutti, M.H.A., Vargas, M.D., Braga, D., Grepioni, F., Mann, B.E., Naylor, S., (1993) Organometallics, 12, p. 2947Yamamoto, A., (1986) Organotransition Metal Chemistry, , WileyMorison, E.D., Bassner, L.S.L., Geoffroy, G.L., (1986) Organometallics, 5, p. 408Pereira, R.M.S., Fujiwara, F.Y., Vargas, M.D., Braga, D., Grepioni, F., (1997) Organometallics, 16, p. 4833Delgado, E., Chi, Y., Wang, W., Horgath, G., Low, P.J., Enright, G.D., Peng, S.-M., Carty, A.J., (1998) Organometallics, 17, p. 2936Vargas, M.D., Pereira, R.M.S., Braga, D., Grepioni, F., (1993) J. Chem. Soc. Chem. Commun., p. 1008Hengefelt, A., Nast, R., (1983) Chem. Ber., 116, p. 2025Livotto, F.S., Raithby, P.R., Vargas, M.D., (1993) J. Chem. Soc. Dalton Trans., p. 1797Brauer, G., (1965) Handboock of Preparative Inorganic Chemistry, 1, p. 645Sheldrick, G.M., (1990) Acta Crystallogr., A46, p. 467Sheldrick, G.M., (1976) SHELX76, Program for Crystal Structure Determination, , University of Cambridge, Cambridge, EnglandWalker, N., Stuart, D., (1983) Acta Crystallogr., Sect. B, 39, p. 158Keller, E., (1992) SHAKAL92, Graphical Representation of Molecular Models, , University of Freiburg, FRGKubota, M., McClesky, T.M., Hayashi, R.K., Carl, G., (1987) J. Am. Chem. Soc., 109, p. 7569Wade, K., (1976) Adv. Inorg. Chem. Radiochem., 18, p. 1Benvenutti, M.H.A., Vargas, M.D., Hitchcock, P.B., Nixon, J.F., (1995) J. Chem. Soc. Chem. Commun., p. 866Carty, A.J., Mac Laughlin, S.A., Nucciaroni, D., (1987) Phosphorus 31-NMR Spectroscopy in Steereochemical Analysis of Organic Compounds and Metal Complexes, , Chapter 16Verkade, J. G.Quin, L. D. EdsVCHKeister, J.B., (1980) J. Organomet. Chem., 190, pp. C36Aime, S., Dastrù, W., Gobetto, R., Viale, A., (1998) Organometallics, 17, p. 3182Johnson, B.F.G., Lewis, J., Orpen, A.G., Raithby, P.R., Süss, G., (1979) J. Organomet. Chem., 173, p. 187Araujo, M.H., Vargas, M.D., unpublished resultsMonti, D., Frachey, G., Bassetti, M., Haynes, A., Sunley, G.J., Maitlis, P.M., Cantoni, A., Bocelli, G., (1995) Inorg. Chim. Acta, 240, p. 485Garcia Alonso, J., Llamazares, A., Riera, V., Diaz, M.R., García Grande, S., (1991) J. Chem. Soc. Chem. Commun., p. 1058Cotton, J.D., Crisp, G.T., Daly, V.A., (1981) Inorg. Chim. Acta, 47, p. 165Bondietti, G., Laurenczy, G., Ross, R., Roulet, R., (1994) Helv. Chim. Acta, 77, p. 1869Laurenczy, G., Bondietti, G., Merbach, A.E., Moulet, B., Roulet, R., (1994) Helv. Chim. Acta, 77, p. 547Braga, D., Grepioni, F., Vargas, M.D., Ziglio, C.M., manuscript in preparatio
X-ray Molecular Structures And Multinuclear Nmr Studies Of The Tetranuclear Iridium Clusters [ir4(co)7(μ4- η3-phcc(h)ccph)(μ-pph2)3] And [ir 4(co)7(μ3-η2-hccph) (η1-ccph)(μ-pph2)3]
No full textThe reaction of [HIr4(CO)10(μ-PPh2)] with two equiv. of Ph2PCCPh produced [HIr4(CO) 8(Ph2PCCPh)2(μ-PPh2)] (1) in quantitative yield. Mild thermolysis of 1 gave [Ir4(CO) 7(μ4-η3-PhCC(H)CCPh)(μ-PPh 2)3] (2) and [Ir4(CO) 7(μ3-η2-HCCPh)(η1-CCPh) (μ-PPh2)3] (3) in good yields. These compounds were characterized with analytical and spectroscopic data including 1H, 13C and 31P NMR (1 and 2D) spectroscopy, and their molecular structures were established by X-ray diffraction studies. The metal frameworks of 2 and 3 are similarly constituted of a spiked metal triangle; in both clusters the seven CO ligands are terminally bound and the three -PPh 2 ligands span two consecutive Ir-Ir bonds and an open edge. The difference between the two structures is that compound 2 contains a butadienic chain, μ4-η3-PhCC(H)CCPh, interacting with all four iridium atoms, whereas compound 3 bears two fragments of this ligand, i.e. a phenylacetylene capping a triangular face and a terminally bound phenylacetylide bonded to the fourth atom of the cluster. Although these two fragments are directed in the appropriate fashion to interact further and generate the chain of compound 2, they do not undergo condensation under thermolytic conditions. © 2005 Elsevier B.V. All rights reserved.69021-2246114619Jeannin, S., Robert, F., Rosenberger, C., (1994) Inorg. Chem., 33, p. 243Bruce, M.I., Koutsantonis, G.A., Tiekink, E.R.T., (1991) J. Organomet. Chem., 407, p. 391Carty, A.J., Hogarth, G., Enright, G., Frapper, G., (1997) Chem. Commun., p. 1883Davies, J.E., Mays, M.J., Raithby, P.R., Sarveswaran, K., (1997) Angew. Chem. Int., Ed. Engl., 36, p. 2668Chi, Y., Carty, A.J., Blenkiron, P., Delgado, E., Enright, G.D., Wang, W., Peng, S.-M., Lee, G.-H., (1996) Organometallics, 15, p. 5269Bobbie, B.J., Taylor, N.J., Carty, A.J., (1991) J. Chem. Soc., Chem. Commun., p. 1511Cherkas, A.A., Randall, L.H., MacLaughlin, S.A., Mott, G.N., Taylor, N.J., Carty, A.J., (1988) Organometallics, 7, p. 969Delgado, E., Chi, Y., Wang, W., Horgath, G., Low, P.J., Enright, G.D., Peng, S.-M., Carty, A.J., (1998) Organometallics, 17, p. 2936Low, P.J., Haynes, T.M., Udachin, K.A., Goeta, A.E., Howard, J.A.K., Enright, G.D., Carty, A.J., (2002) J. Chem. Soc., Dalton Trans., p. 1455Cherkas, A.A., Taylor, N.J., Carty, A.J., (1990) J. Chem. Soc., Chem. Commun., p. 385Bobbie, B.J., Taylor, N.J., Carty, A.J., (1991) J. Chem. Soc., Chem. Commun., p. 151Mathur, P., Ahmed, M.O., Dash, A.K., Walawalkar, M.G., (1999) J. Chem. Soc., Dalton Trans., p. 1795Mathur, P., Ahmed, M.O., Dash, A.K., Walawalkar, M.G., Puranik, V.G., (2000) J. Chem. Soc., Dalton Trans., p. 2916Benvenutti, M.H.A., Vargas, M.D., Braga, D., Grepioni, F., Mann, B.E., Naylor, S., (1993) Organometallics, 12, p. 2947Araujo, M.H., Avent, A.G., Vargas, M.D., Braga, D., Grepioni, F., (2004) J. Organomet. Chem., 689, p. 3513Livotto, F.S., Raithby, P.R., Vargas, M.D., (1993) J. Chem. Soc., Dalton Trans., p. 1797Hitchcock, P.B., Nixon, J.F., Vargas, M.D., Ziglio, C.M., (2000) J. Chem. Soc., Dalton Trans., p. 2916Ziglio, C.M., Vargas, M.D., Braga, D., Grepioni, F., Nixon, J.F., (2002) J. Organomet. Chem., 656, p. 188Ros, R., Scrivanti, A., Albano, V.G., Braga, D., Garlaschelli, L., (1986) J. Chem. Soc., Dalton Trans., p. 2411Ceriotti, A., Della Pergola, R., Demartin, F., Garlaschelli, L., Manassero, M., Masciocchi, N., (1992) Organometallics, 11, p. 756Pereira, R.M.S., Fujiwara, F.Y., Vargas, M.D., Braga, D., Grepioni, F., (1997) Organometallics, 16, p. 4833Wong, W.-Y., Ting, F.-L., Lam, W.-L., (2001) Eur. J. Chem., p. 623Cherkas, A.A., Taylor, N.J., Carty, A.J., (1990) J. Chem. Soc., Chem. Commun., p. 385Carty, A.J., Mac Laughlin, S.A., Nucciaroni, D., (1987) Phosphorus31-NMR Spectroscopy in Stereochemical Analysis of Organic Compounds and Metal Complexes, , J.G. Verkade L.D. Quin VCHAraujo, M.H., Hitchcock, P.B., Nixon, J.F., Vargas, M.D., (1998) J. Braz. Chem. Soc., 9, p. 563Charmant, J.P.H., Davies, G., King, P.J., Wigginton, J.R., Sappa, E., (2000) Organometallics, 19, p. 2330Hengefelt, A., Nast, R., (1983) Chem. Ber., 116, p. 2025Sheldrick, G.M., (1997) Shelx-97, Program for Crystal Structure Determination, , University of Göttingen Göttingen, GermanyKeller, E., (1999) Schakal99 Graphical Representation of Molecular Models, , University of Freiburg German
Syntheses And Structural Characterisation Of [ir4(co)11(η1-l)] And [ir4(co)10(η1-l)2] {l = [fe(η5-p3c2but 2)(η5-p2c3but 3)] And [fe(η5-c5h5)...
No full textTitle full: Syntheses and structural characterisation of [Ir4(CO)11(η1-L)] and [Ir4(CO)10(η1-L)2] {L = [Fe(η5-P3C2But 2)(η5-P2C3But 3)] and [Fe(η5-C5H5)(η5-P 3C2But 2)]} and [Ir4(CO)11{μ-η1:η 1-[Fe(η5-C5H5)(η 5. The reactions of NBu4[Ir4(CO)11Br] 1 with equivalent amounts of [Fe(η5-P3C2But 2)(η5-P2C3But 3)] L1 or [Fe(η5-C5H5)(η5-P 3C2But 2)] L2 in the presence of AgSbF6 gave good yields of [Ir4(CO)11(η1-L)] 2a or 2b, besides [Ir4(CO)10(η1-L)2] 3a and 3b, respectively, in which the ligands are bound via the PA atom. The solid-state structure of 2b, established by an X-ray analysis, is that of the Td-like isomer, although the low-temperature 31P-{1H} NMR spectrum showed the presence of both C3v- and Td-like isomers in solution. Compound 2a underwent facile conversion to [Ir4(CO)10(μ-η2-L1)] 4a via CO loss and further interaction of the adjacent PB atom of L1. Compound 2b reacted with 1 in the presence of AgSbF6 to yield [Ir4(CO)11-(μ-η1:η 1-L2)Ir4(CO)11] 5b, in which the second Ir4 cluster was ligated via PC, rather than PB, according to NMR spectroscopy. This compound underwent clean conversion into [Ir4H(CO)10{Fe(η5-C5H 5)[η5-P3C(CMe2CH 2)CBut]}Ir4(CO)11] 6b, via CO loss and oxidative addition of a C-H bond of a tert-butyl substituent in the P3C2But 2 ring. The molecular structure of 6b was determined by a single crystal X-ray diffraction analysis, which showed that C-H activation occurred on the Ir4 cluster bound via PC.5739746Bartsch, R., Hitchcock, P.B., Nixon, J.F., (1987) J. Chem. Soc., Chem. Commun., p. 1146Binger, P., Glaser, G., (1994) J. Organomet. Chem., 479, pp. C28Bartsch, R., Hitchcock, P.B., Nixon, J.F., (1988) J. Organomet. Chem., 340, pp. C37Müller, C., Bartsch, R., Fischer, A., Jones, P.G., (1993) J. Organomet. Chem., 453, pp. C16Nixon, J.F., (1988) Chem. 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1,2,3-triphenyiphosphirene Derivatives Of The Iridium Carbonyl Clusters [hir4(co)9l(μ-pph2)] (l = Co, Pph3) Resulting From Substitution, Insertion And Hydrometallation Processes 1
No full text1,2,3-Triphenylphosphirene reacts with [HIr4(CO)10(μ-PPh2)] 1, at room temperature, to afford [Ir4(CO)8(μ3-μ 2PhPCPh=CPh)(μ-PhPCPh=CHPh)(μ-PPh2)] 2 which contains the phosphametallacycle (μ3-η2-PhPCPh=CPh) and the phosphidoalkenyl (μ-PhPCPh=CHPh) ligands arising from insertion and hydrometallation processes respectively. In contrast, the PPh3 derivative of 1, [HIr4(CO)9(PPh3)(μ-PPh2)] 3, reacts selectively at room temperature with the phosphirene to give only CO substitution products, [HIr4(CO)9-n(PPh3)(η 1-PhPCPh=CPh)n(μ-PPh2)] (n=1,4 and 2, 5) which are the first carbonyl cluster compounds containing intact η1-ligated phosphirene rings. High yield conversion of compound 4 into the phosphametallacycle species [HIr4(CO)7(PPh3)(μ3-η 2-PhPCPh=CPh)(μ-PPh2)] 6 is achieved under mild thermolytic conditions. An insight into the mechanism of formation of 2 was given by the reaction of the phosphirene ring with the anion [Ir4(CO)10(μ-PPh2)]- 1a derived from 1, followed by protonation, which gave [HIr4(CO)8(μ3-η 2-PhPCPh=CPh)(μ-PPh2)] 7, which is analogous to 6 with a CO ligand replacing PPh3. Quantitative conversion of the hydride phosphametallacycle 7 into the labile phosphidoalkenyl cluster [Ir4(CO)n(μ-PhPCPh=CHPh)(μ-PPh2)] 8 is easily achieved in the presence of CO (1 atm, RT, 2 h), as a result of the reductive elimination of a C-H group. Compound 8 undergoes facile CO dissociation and co-ordination of the phosphidoalkenyl C=C bond to the metal centre to produce [Ir4(CO)9(μ3-η 3-PhPCPh=CHPh)(μ-PPh2)] 9. The molecular structures of compounds 2,4,6 and 9 were established by X-ray diffraction studies and the structures of all compounds in solution were investigated by a combination of 1H and 31P{1H} NMR studies. © The Royal Society of Chemistry 2000.1525272536Mathey, F., (1990) Chem. 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Carbon-carbon Coupling On Tetrahedral Iridium Clusters: X-ray Molecular Structures And Multinuclear Nmr Studies Of The Two Isomeric Forms Of [ir4(co)6(μ3-η2 -hccph)(μ2-η4-c4h2 Ph2)(μ-pph2)2]
No full textThe reactions of [HIr4(CO)9 (Ph2PC ≡CPh)(μ-PPh2)] (1) or [Ir4(CO) 8 (μ3-η2-HCCPh) (μ-PPh2)2] (2) with HC ≡ CPh gave two isomeric forms of [Ir4(CO)6 (μ3-η2HCCPh)(μ2 -η4-C4H2Ph2) (μ-PPh2)2] (3 and 4) in good yields as the only products. These compounds were characterized with analytical and spectroscopic data including 1H, 13C and 31P NMR (1 and 2D) spectroscopy and their molecular structures were established by X-ray diffraction studies. Compounds 3 and 4 exhibit the same distorted butterfly metal polyhedral arrangement of metal atoms with two μ-PPh2 that occupy different positions in the structures of the two isomers. Both molecules contain a HCCPh ligand bonded in a μ3 -η2-// mode to one of the wings of the butterfly and a metallacyclic ring, which resulted from head-to-tail coupling, in the case of [Ir4(CO)6 (μ3-η2-HCCPh){μ-η4 -(H)CC(Ph)C(H)C(Ph)}(μ-PPh2)2] (3) and tail-to-tail coupling, in that of [Ir4(CO)6 (μ3-η2-HCCPh){μ2 -η4-(H)CC(Ph)C(Ph)C(H)}(μ-PPh2) 2] (4), and which is linked to two metal atoms of the second wing of the butterfly. © Elsevier B.V. All rights reserved.6892235133519Sappa, E., Tiripicchio, A., Braunstein, P., (1983) Chem. Rev., 83, p. 203Raithby, P.R., Rosales, M.J., (1985) Adv. Inorg. Chem. Radiochem., 29, p. 169Mallors, R.L., Blake, A.J., Dyson, P.J., Johnson, B.F.G., Parsons, S., (1997) Organometallics, 16, p. 1668Sappa, E., (1994) J. Cluster Sci., 5, p. 211. , and references thereinCarty, A.J., (1982) Pure Appl. Chem., 54, p. 113Choualeb, A., Braunstein, P., Rose, J., Welter, R., (2004) Inorg. 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Novel C-h Activation In A Bis-tetrairidium Carbonyl Complex Of The Sandwich Compound [fe(η5-c5h5)(η5-p 3c2but 2)]: Crystal And Molecular Structures Of [ir4(co)11{fe(η5-c5h 5)(η5-p3c2bu(t) 2)}]
No full textThe syntheses and structural determinations of novel complexes of the type [Ir4(CO)11L] {L = [Fe(η5-P3C2But 2)(η5s-P2C3But 3)] or [Fe(η5-C5H5)(η5-P 3C2But 2)]} and [HIr4(CO)10-(μ-Fe(η5-C5H 5)(η5-P3CH2(CMe 2)CBut)}Ir4(CO)11], involving an unusual C-H activation, are described.3441443Bartsch, R., Hitchcock, P.B., Nixon, J.F., (1987) J. Chem. Soc., Chem. Commun., p. 1146Binger, P., Glaser, G., (1994) J. Organomet. Chem., 479, pp. C28Bartsch, R., Hitchcock, P.B., Nixon, J.F., (1988) J. Organomet. Chem., 340, pp. C37Müller, C., Bartsch, R., Fischer, A., Jones, P.G., (1993) J. Organomet. Chem., 453, pp. C16Nixon, J.F., (1988) Chem. Rev., 88, p. 1327Nixon, J.F., (1991) Endeavour, 15, p. 49(1993) Chem. Ind., p. 404Bartsch, R., Gelessus, A., Hitchcock, P.B., Nixon, J.F., (1992) J. Organomet. Chem., 430, pp. C10Müller, C., Bartsch, R., Fischer, A., Jones, P.G., (1993) Polyhedron, 12, p. 1383Chini, P., Ciani, G., Garlaschelli, L., Manassero, M., Martinengo, S., Sironi, A., Canziani, F., (1978) J. Organomet. Chem., 152, pp. C35Besançon, K., Laurenczy, G., Lumini, T., Roulet, R., Gervasio, G., (1993) Helv. Chim. Acta, 76, p. 2926. , and references thereinMann, B.E., Vargas, M.D., Katthar, R., (1992) J. Chem. Soc., Dalton Trans., p. 1725Mann, B.E., Pickup, B.T., Smith, A.K., (1989) J. Chem. Soc., Dalton Trans., p. 889Churchill, M.R., Hutchinson, J.P., (1978) Inorg. Chem., 17, p. 3528Della Pergola, R., Garlaschelli, L., Martinengo, S., Demartin, F., Manassero, M., Sansoni, M., (1987) Gazz. Chim. Ital., 117, p. 245Shapley, J.R., Stuntz, G.F., Churchill, M.R., Hutchinson, J.P., (1979) J.Chem. Soc., Chem. Commun., p. 219Vargas, M.D., Pereira, R.M.S., Braga, D., Grepioni, F., (1993) J. Chem. Soc., Chem. Commun., p. 1008Nicholls, J.N., Raithby, P.R., Vargas, M.D., (1986) J. Chem. Soc., Chem. Commun., p. 1617Demartin, F., Manassero, M., Sansoni, M., Garlaschelli, L., Raimondi, C., Martinengo, S., Canziani, F., (1981) J. Chem. Soc., Chem. Commun., p. 52
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
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