Academic literature on the topic 'Metal-metal quadruple bonds'

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Journal articles on the topic "Metal-metal quadruple bonds"

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Chisholm, Malcolm H., Arthur J. Epstein, Judith C. Gallucci, Florian Feil, and Wesley Pirkle. "Oligothiophenes Incorporating Metal-Metal Quadruple Bonds." Angewandte Chemie International Edition 44, no. 40 (October 14, 2005): 6537–40. http://dx.doi.org/10.1002/anie.200500138.

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Chisholm, Malcolm H., Arthur J. Epstein, Judith C. Gallucci, Florian Feil, and Wesley Pirkle. "Oligothiophenes Incorporating Metal-Metal Quadruple Bonds." Angewandte Chemie 117, no. 40 (October 14, 2005): 6695–98. http://dx.doi.org/10.1002/ange.200500138.

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Li, Ming. "Study on some metal-metal quadruple bonds." International Journal of Quantum Chemistry 43, no. 3 (July 20, 1992): 343–52. http://dx.doi.org/10.1002/qua.560430305.

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Chisholm, Malcolm H. "Mixed valency and metal–metal quadruple bonds." Coordination Chemistry Reviews 257, no. 9-10 (May 2013): 1576–83. http://dx.doi.org/10.1016/j.ccr.2012.10.021.

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Kerby, Michael C., Bryan W. Eichhorn, Loriann Doviken, and K. Peter C. Vollhardt. "Activated molybdenum-molybdenum quadruple bonds. 2. First example of alkyne additions to metal-metal quadruple bonds." Inorganic Chemistry 30, no. 2 (January 1991): 156–58. http://dx.doi.org/10.1021/ic00002a003.

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Hua, Shao-An, Yi-Chou Tsai, and Shie-Ming Peng. "A Journey of Metal-metal Bonding beyond Cotton's Quadruple Bonds." Journal of the Chinese Chemical Society 61, no. 1 (October 22, 2013): 9–26. http://dx.doi.org/10.1002/jccs.201300417.

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Ismayilov, Rayyat H., Wen-Zhen Wang, Rui-Ren Wang, Chen-Yu Yeh, Gene-Hsiang Lee, and Shie-Ming Peng. "Four quadruple metal–metal bonds lined up: linear nonachromium(ii) metal string complexes." Chem. Commun., no. 11 (2007): 1121–23. http://dx.doi.org/10.1039/b614597c.

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KERBY, M. C., B. W. EICHHORN, L. DOVIKEN, and K. P. C. VOLLHARDT. "ChemInform Abstract: Activated Molybdenum-Molybdenum Quadruple Bonds. Part 2. First Example of Alkyne Additions to Metal-Metal Quadruple Bonds." ChemInform 22, no. 20 (August 23, 2010): no. http://dx.doi.org/10.1002/chin.199120234.

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Cotton, F. Albert. "Metal-metal quadruple bonds: New frontiers for their kith and kin." Journal of Cluster Science 5, no. 1 (March 1994): 3–9. http://dx.doi.org/10.1007/bf01165489.

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Dalal, Naresh S., and Carlos A. Murillo. "The usefulness of EPR spectroscopy in the study of compounds with metal–metal multiple bonds." Dalton Trans. 43, no. 23 (2014): 8565–76. http://dx.doi.org/10.1039/c4dt00506f.

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A discussion of how EPR spectroscopy has contributed to the understanding of the electronic structure of paddlewheel compounds with multiple bonds between metal atoms is presented while commemorating the 50th anniversary of the paper describing the quadruple bond and the identification of the delta bond in the Re2Cl82− anion.
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Dissertations / Theses on the topic "Metal-metal quadruple bonds"

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Acho, Jacqueline A. "Reductive coupling, and, transition metal calixarene complexes : metal-metal quadruple bonds and pockets." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/32149.

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English, Jason B. "Electronic structure investigations of multiple bonding between atoms: From metal-nitrogen triple bonds to metal-metal triple and quadruple bonds." Diss., The University of Arizona, 2002. http://hdl.handle.net/10150/280021.

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The nature of multiple bonding involving transition metal atoms has been explored via photoelectron spectroscopic and computational studies of molecules containing metal-metal quadruple and triple bonds as well as of molecules containing formal metal-nitrogen triple bonds. The principles governing the nature of the multiple bonding in these systems are similar whether the multiple bonding occurs between two transition metals or between a transition metal and a nitrogen atom. First, the electronic structures of the R₃M≡N molecules, where R = ᵗBuO (Cr, Mo, W); iPrO (Mo); (CH₃)₂CF₃CO (Mo); and Cl (Mo), are examined by photoelectron spectroscopy in conjunction with density functional calculations. To assign the features seen in the photoelectron spectra, close attention is paid to the effects of (1) metal substitution and (2) alkoxide (or Cl) substitution. Examination of the photoelectron spectra of the full series of alkoxide-substituted molecules allows the relative positions of the ionizations from the M≡N σ and π orbitals to be identified. Of great importance to the electronic structure of these molecules are the alkoxide orbital combinations that mix strongly with the M≡N σ and π orbitals. The importance of the ancillary ligand combinations is clearly demonstrated by the photoelectron spectroscopic and computational studies of Cl₃Mo≡N. The replacement of the alkoxide ligand with chlorides greatly simplifies the resultant photoelectron spectrum, allowing all of the valence ionizations to be assigned. Next, the bonding in the M₂X₄(PMe₃)₄ molecules, where M = Mo (X = Cl, Br); W (X = Cl); and Re (X = Cl, Br, I), is explored by photoelectron spectroscopic investigations in conjunction with electronic structure calculations. From these investigations, the ionizations from the metal-based orbitals as well as several ligand-based orbitals have been assigned. The first ionization energies of both the molybdenum (δ) and rhenium (δ*) molecules decrease as the electronegativity of the halide increases. The origin of this inverse halide effect is explored. Finally, the nature of the quadruple metal-metal bond in the M₂(chp)₄ molecules (M = Cr, Mo, W; chp = 2-chloro-6-oxo-pyridinate) is probed. For all three metal systems, an ionization from the M₂ δ orbital can be seen. This is only the second time a distinct ionization feature has been noted for ionization of the delta orbital from a dichromium molecule. Comparisons with the previously studied M₂(mhp)₄ molecules (mhp = 6-methyl-2-oxo-pyridinate) allow for a better understanding of the electronic structure of these molecules.
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Kristofzski, John Gregory. "Ionization-structure relationships of thin film and gas phase group VI metal-metal quadruple-bonded complexes." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184384.

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Principles involving the electronic structure of group VI metal-metal multiple bonded complexes are examined in order to provide insights into the intramolecular and intermolecular interactions of these systems. Examination of chromium, molybdenum and tungsten tetracarboxylate thin films by ultraviolet photoelectron spectroscopy has provided the first experimental evidence for the location of the σ ionization in dimolybdenum tetracarboxylate quadruple bonded complexes. These compounds have significant intermolecular interactions as thin films which destabilizes ionization of the valence σ state, allowing it to be experimentally observed. This is supported by the observed destabilization of the σ ionization feature of the ditungsten analogue in going to the thin film. The Cr₂(O₂CCH₃)₄ comparison shows a destabilization of the leading predominantly metal ionizations consistent with the broad range of M-M bond lengths observed for Cr₂ complexes. The Group VI M₂(mhp)₄ and M₂(chp)₄ [mhp=6-methyl-2-oxo-pyridine and chp=6-chloro-2-oxo-pyridine] complexes are also examined. The geometric constraints imposed on the compounds by the ligand effectively block intermolecular interaction axial to the metal-metal bond in the solid state. Comparison of the two ligand spectra, Hmhp and Hchp, has provided a unique opportunity to assign ionizations previously attributed to the keto form of the Hmhp tautomers. The spectra of the complexes exhibit minimal relative shifting of ionization features in going to the thin films because of this constraint. A band previously believed to be due to spin orbit coupling is assigned to the σ ionization in the ditungsten complex. The overall ionization band profiles of the two series correlate well, metal by metal, with the expected shifting due to substitution of the more electronegative chlorine atoms for a methyl group. The synthesis and characterization of Mo₂(N-t-butyl-acetamide)₄, the first tetraamidodimetal compound without large rings with delocalized pi structure, is described. The single crystal X-ray structure is presented, revealing the novel (one of three examples) cis configuration of the MoN₂O₂ ligand set. The Mo-Mo bond length of 2.063 Å is one of the shortest seen to date. A preliminary gas phase He I valence spectrum is reported.
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Ziehm, Christopher. "Ground State and Excited State Mixed Valency in Metal-Metal Quadruply Bonded Complexes Supported by Extended π Ligands." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469017749.

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D'Acchioli, Jason S. "On the nature of the electronics structure of metal-metal quadruply bonded complexes." Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1126621699.

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Thesis (Ph. D.)--Ohio State University, 2005.
Title from first page of PDF file. Document formatted into pages; contains xii, 286 p.; also includes graphics (some col.). Includes bibliographical references (p. 273-286). Available online via OhioLINK's ETD Center
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Durr, Christopher Blair. "The Effect of Metal Containing Ligands on The Metal-Metal Quadruple Bond: Structure, Synthesis, And Photophysics." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429542171.

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Brown-Xu, Samantha E. "Photophysical and Photosensitizing Properties of Dimetal Quadruply Bonded Paddlewheel Complexes Probed Through Ultrafast Spectroscopy." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1405491729.

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Halvachizadeh, Jaleh. "The Investigation of Reactions of Atomic Metal Anions with Small Hydrocarbons and Alcohols in the Gas Phase." Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/30646.

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Hydrocarbons are an abundant resource of carbon and hydrogen. For example, fossil can be used to produce useful organic compounds. However hydrocarbons seem to be inert. Thus, the activation of the C-H bond is a popular research area. Metals play the main role in most catalysts that convert hydrocarbons to starting materials in industry. The study of metals is important because the properties of the metal core greatly influences the reactivity of a catalyst.1 The study of the chemistry of metals in the gas phase provides valuable information about the properties of metals. This information can be expanded to the chemistry of metals in the condensed phase. Furthermore, it is often both more accurate and more manageable to study the profile of a reaction in the gas phase than in the condensed phase.2,3 There are many studies about metal cations in the gas phase due to ease of their production. However metals have low electronegativity, limiting the study of gas phase metal anions. Recently, a simple and efficient method to generate atomic metal anions was developed at the University of Ottawa in Dr. Mayer's research laboratory.4-6 Atomic metal anions of Fe-, Co-, Cu-, Ag-, Cs- and K- were generated in an electrospray ionization (ESI) source of a mass spectrometer (MS). In this thesis study generated metal anions were reacted with small hydrocarbons of pentane, 1-pentene, 2-pentene and 1-pentyne to investigate the role of different metal anions in the activation of the C-H bond. Also metal anions were reacted with small alcohols of 1-butanol, 2-butanol and 2-methyl-2-propanol to compare the results. Metal anions showed a variety of reactions with these hydrocarbons and alcohols. Fe- was the only metal anion to show the electron transfer reaction, indicating that alcohols are more electronegative than Fe- and less electronegative than other metal anions. Fe-, Co- and Ag- showed the complex formation reaction. All metal anions showed the deprotonation reaction. A deprotonation reaction follows the harpoon mechanism, the long range proton abstraction7, and depends on the gas phase acidity of fragments. The most informative reaction observed was the dehydrogenation reaction because a metal-containing fragment is observed as a product in the spectrum of this reaction. The observation of a metal-containing fragment in the spectrum is significant because it emphasizes the important role that metal anions play in this reaction. This suggests that a dehydrogenation reaction involves metal insertion into a C-H bond. Among the transition metal anions, it was observed that Fe- and Cu- are more reactive than Co- and Ag- with regards to the dehydrogenation reaction, probably because Fe- and Cu- have a greater hydrogen affinity than Co- and Ag- that facilitates the hydrogen abstraction reaction. Another reason could be that Fe- and Cu- have a greater gas phase acidity that leads to a more stable intermediate in the course of the reaction. The results of this thesis study revealed that Cs- and K- could not abstract H from these substrates, probably due to the absence of occupied d orbitals that would facilitate insertion into a C-H bond. Some metal anions not only can insert into a C-H bond of alcohols but also can insert into a C-O bond of alcohols to form metal hydroxide anions. Alcohols are more reactive than hydrocarbons with regards to reactions with metal anions because they contain a functional group. This thesis study shows that some atomic metal anions are able to activate the C-H bond and abstract two hydrogens to form a double bond in hydrocarbons. It is probable that the electronic configuration, gas phase acidity and hydrogen affinity of the metal anions governs their reactivity.
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Giraudon, Jean-Marc. "Complexes mono et dinucléaires du molybdene avec les ligands macrocycliques : synthèse, structure, réactivité et propriétés redox." Brest, 1988. http://www.theses.fr/1988BRES2019.

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Preparation des complexes avec le coordinat tetraazaannulene; cas de complexes a liaison quadruple du mo ou le coordinat organique presente une coordination tetradentee. On envisage les mecanismes d'interconversion monomere oxo-dinucleaire. Etudes rpe et uv-visible
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Book chapters on the topic "Metal-metal quadruple bonds"

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Wilkinson, Luke A. "Advances in the chemistry of metal–metal quadruple bonds 2015–2020." In Organometallic Chemistry, 111–43. Cambridge: Royal Society of Chemistry, 2020. http://dx.doi.org/10.1039/9781788017077-00111.

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Koz’min, P. A. "Quadruple Metal-Metal Bond: History and Outlook." In Culture of Chemistry, 169–73. Boston, MA: Springer US, 2015. http://dx.doi.org/10.1007/978-1-4899-7565-2_36.

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Chi, Yun, Sue-Lein Wang, and Shie-Ming Peng. "Facile Exchange of Terminal, Doubly Bridging, and Quadruply Bridging Carbonyl Ligands in Solution: Crystal Structure and Solution Dynamics of LWM3(CO)12H, L=C5H5, C5Me5 and M=Os, Ru." In Metal-Metal Bonds and Clusters in Chemistry and Catalysis, 312–13. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4899-2492-6_23.

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Conference papers on the topic "Metal-metal quadruple bonds"

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Chisholm, Malcolm H. "Oligothiophenes incorporating metal-metal quadruple bonds (MM = Mo2, MoW and W2). A chemical approach for photon harvesting and spectral expansion." In 2009 34th IEEE Photovoltaic Specialists Conference (PVSC). IEEE, 2009. http://dx.doi.org/10.1109/pvsc.2009.5411267.

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