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Academic literature on the topic 'Metallocenes'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 July 2024

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Journal articles on the topic "Metallocenes"

1

Ding, Yu, Yu Zhao, Yutao Li, John B. Goodenough, and Guihua Yu. "A high-performance all-metallocene-based, non-aqueous redox flow battery." Energy & Environmental Science 10, no. 2 (2017): 491–97. http://dx.doi.org/10.1039/c6ee02057g.

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An all-metallocene based redox flow battery was constructed using ferrocene catholyte and cobaltocene anolyte with a working potential of ∼1.7 V. The potential can be lifted to 2.1 V via rational functionalization of metallocenes, showing the promise of metallocenes as electroactive materials for stationary energy storage.

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2

Yang, Qing, and Max Paul McDaniel. "Comparison of Support Effects on Phillips and Metallocene Catalysts." Catalysts 11, no. 7 (July 13, 2021): 842. http://dx.doi.org/10.3390/catal11070842.

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Both metallocene and Phillips chromium catalysts are used in the commercial manufacture of polyethylene. Unlike most other commercial metallocene systems, the Chevron Phillips Chemical (CPC) platform does not use methylaluminoxane or fluoroorganic boranes. Instead, the support itself serves to activate (ionize) the metallocenes, which then polymerize ethylene at high activity. Most of these solid acid supports can also be used to anchor Cr to make a Phillips catalyst. This provides an interesting opportunity to compare the polymerization responses by these two disparate systems, Phillips Cr and CPC metallocene, when supported on the same solid acid carriers. In this study, both chromium oxide and several metallocenes were deposited onto a variety of solid oxides, under a variety of conditions, and the resulting support effects were observed and compared. Although using seemingly different chemistries, the two catalyst systems exhibited a surprising number of similarities, which can be attributed to the acidity and porosity of these diverse supports.

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3

Kharlamova, Marianna V., and Christian Kramberger. "Metallocene-Filled Single-Walled Carbon Nanotube Hybrids." Nanomaterials 13, no. 4 (February 19, 2023): 774. http://dx.doi.org/10.3390/nano13040774.

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In this paper, the growth mechanism, structure, growth processes, growth kinetics, and optical, vibronic and electronic properties of metallocene-filled single-walled carbon nanotubes (SWCNTs) are considered. A description of the procedures used to fill the nanotubes is provided. An investigation of doping effects on metallicity-mixed SWCNTs filled with metallocenes by Raman spectroscopy, near edge X-ray absorption fine structure spectroscopy, photoemission spectroscopy, and optical absorption spectroscopy is described. The studies of doping effects on metallicity-sorted SWCNTs filled with metallocenes are discussed. Doping effects in metallicity-mixed and sorted SWCNTs upon the chemical transformation of encapsulated molecules are analyzed. A discussion of the modification of the electronic properties of filled SWCNTs is presented. Applications of metallocene-filled SWCNTs in electrochemistry, thermoelectric power generation, chemical sensors, and magnetic recording are discussed.

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4

Manners, Ian. "Article." Canadian Journal of Chemistry 76, no. 4 (April 1, 1998): 371–81. http://dx.doi.org/10.1139/v98-054.

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Ring-opening polymerization (ROP) of strained ring-tilted metallocenophanes can be achieved thermally, via anionic or cationic initiation, or by the use of transition-metal catalysts and provides access to a wide range of high molecular weight (Mw = 105-106, Mn > 105) poly(metallocenes). These materials possess a variety of interesting properties and many are very easy to prepare. This article provides an overview of our work, giving background to and an account of the initial discovery, and discusses work on the synthesis and properties of new poly(metallocenes) and related materials with particular emphasis on recent research directions.Key words: metallocene, ring-opening polymerization, ferrocenophane, organometallic polymer.

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5

Klett, Jan, and Julia Hein. "The Preparation of Tetramethyl 1,1′,3,3′-Ruthenocenetetracarboxylate and Tetramethyl 1,1′,3,3′-Osmocenetetracarboxylate, and a Simplified Synthesis for Tetramethyl 1,1′,3,3′-Ferrocenetetracarboxylate." Synthesis 51, no. 02 (December 12, 2018): 407–13. http://dx.doi.org/10.1055/s-0037-1610844.

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Substituted metallocenes with more than two substituents have to be synthesized using doubly substituted cyclopentadiene rings in a reaction with a metal compound or by the introduction of additional functional groups to an already di-substituted metallocene. The direct formation of tetra-substituted metallocenes often suffers due to insufficient reactivity of the reagents or the resulting product mixtures, which are hard to separate. In this work, a protocol, which was successful in a tetra-substitution of ferrocene by a tetra-metalation followed by a reaction with carbon dioxide, is used to perform the tetra-substitution of ruthenocene and osmocene. In addition, a simplified protocol for the tetra-functionalization of ferrocene using commercially available components on a medium scale is described.

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6

Chalmpes, Nikolaos, Georgios Asimakopoulos, Maria Baikousi, Athanasios B. Bourlinos, Michael A. Karakassides, and Dimitrios Gournis. "Hypergolic Synthesis of Inorganic Materials by the Reaction of Metallocene Dichlorides with Fuming Nitric Acid at Ambient Conditions: The Case of Photocatalytic Titania." Sci 3, no. 4 (December 3, 2021): 46. http://dx.doi.org/10.3390/sci3040046.

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Hypergolic materials synthesis is a new preparative technique in materials science that allows a wide range of carbon or inorganic solids with useful properties to be obtained. Previously we have demonstrated that metallocenes are versatile reagents in the hypergolic synthesis of inorganic materials, such as γ-Fe2O3, Cr2O3, Co, Ni and alloy CoNi. Here, we go one step further by using metallocene dichlorides as precursors for the hypergolic synthesis of additional inorganic phases, such as photocatalytic titania. Metallocene dichlorides are closely related to metallocenes, thus expanding the arsenal of organometallic compounds that can be used in hypergolic materials synthesis. In the present case, we show that hypergolic ignition of the titanocene dichloride–fuming nitric acid pair results in the fast and spontaneous formation of titania nanoparticles at ambient conditions in the form of anatase–rutile mixed phases. The obtained titania shows good photocatalytic activity towards Cr(VI) removal (100% within 9 h), with the latter being dramatically enhanced after calcination of the powder at 500 °C (100% within 3 h). Notably, this performance was found to be comparable to that of commercially available P25 TiO2 under identical conditions. The cases of zirconocene, hafnocene and molybdocene dichlorides are discussed in this work, which aims to show the wider applicability of metallocene dichlorides in the hypergolic synthesis of inorganic materials (ZrO2, HfO2, MoO2).

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7

Infante-Martínez, Ramiro, Enrique Saldívar-Guerra, Odilia Pérez-Camacho, and Maricela García-Zamora. "Ethylene Polymerization via Metallocenes: An Experimental Study." MRS Proceedings 1767 (2015): 11–16. http://dx.doi.org/10.1557/opl.2015.221.

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ABSTRACTAn experimental study oriented to gather kinetic modelling data in the ethylene polymerization via metallocenes is reported. Also is illustrated the employment of two methods for determination of kinetic behavior and the instantaneous activity of Ziegler-Natta catalysts in the slurry polymerization of ethylene. The theoretical basis for both methods is described as well as the required instrumentation for its implantation at a laboratory level. An experimental program of polymerization with two different metallocenic systems was executed, showing that the direct (measurement of ethylene flow) as well as the calorimetric method (based on energy balances) give equivalent high quality information on the kinetic performance of the catalyst.

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8

Wang, Qingzheng, and Joyce Y. Corey. "Dehydrocoupling reactions of hydrosilanes with group 4 metallocenes Cp2MY2 (M = Ti, Zr, Hf; Y = F, OPh, NMe2)." Canadian Journal of Chemistry 78, no. 11 (November 1, 2000): 1434–40. http://dx.doi.org/10.1139/v99-237.

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Dehydrocoupling polymerization of phenylsilane with group 4 metallocene precatalysts Cp2MY2 (M = Ti, Zr, Hf; Y = F, OPh, NMe2) under comparable conditions has been examined. All nine title metallocenes produced polysilane products which ranged in molecular weight from 1100 to 4400 and exhibited ratios of linear to cyclic products from ~2 to 30. The highest molecular weight polysilanes observed for each metal were obtained from Cp2M(NMe2)2 and the highest percentage of linear polysilane was found with Cp2Hf(NMe2)2. The near stoichiometric reactions of Cp2MY2 with PhSiH3, PhMeSiH2, and Ph2MeSiH were monitored by 1H, 19F and 29Si NMR spectroscopy and in all cases exchange products containing Si-Y were identified. Metal hydride species could be observed only with Cp2TiY2.Key words: metallocene, dehydrocoupling, polymerization, hydrosilanes, polysilane.

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9

Pavlík, Ivan, Josef Fiedler, Jaromír Vinklárek, and Martin Pavlišta. "Ligand Field Model and d-d Spectra of dN Metallocene Complexes." Collection of Czechoslovak Chemical Communications 66, no. 2 (2001): 228–54. http://dx.doi.org/10.1135/cccc20010228.

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Complete ligand field calculations, including spin-orbit coupling, have been carried out for bent d1 metallocene complexes, [M(Cp)2Ln] (Cp = η5-cyclopentadienyl, n = 1 or 2), in C2v symmetry. Using the strong-field coupling formalism (with exclusion of spin-orbit coupling) the full energy matrices for d2, d3, and d4 bent metallocenes were constructed in terms of four ligand field splitting parameters and two Racah interelectronic repulsion parameters (only d2 energy matrices are presented here). The bonding in the bent d1 C2v M(Cp)2 fragment was analyzed from the point of view of the ligand field model. The experimental d-d transition energies of two d1 metallocene dichlorides, vanadocene and niobocene dichlorides, have been assigned, the values of four one-electron ligand field splitting parameters determined and the effect of spin-orbit coupling estimated. The ground state of both d1 metallocene dichlorides has shown to be 2A(111), the d-orbital energy order being 1a1 < b1 < b2 < 2a1 < a2. Finally, the prediction of d-d spectra for d2, d3, and d4 bent metallocene complexes is presented.

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10

Ferber, Benoit, and Henri B Kagan. "Metallocene Sulfoxides as Precursors of Metallocenes with Planar Chirality." Advanced Synthesis & Catalysis 349, no. 4-5 (March 5, 2007): 493–507. http://dx.doi.org/10.1002/adsc.200600639.

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Dissertations / Theses on the topic "Metallocenes"

1

Charpentier, Paul A. "Metallocene-catalyzed semi-batch and continuous polymerization of ethylene /." *McMaster only, 1997.

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2

Mokdsi, George. "Antitumour Metallocenes." Thesis, The University of Sydney, 2000. http://hdl.handle.net/2123/794.

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This thesis reports a study of the chemical stability and coordination chemistry of several antitumour metallocenes Cp2MCl2 (Cp = h5-C5H5; M = Ti 1, V 2, Nb 3, Mo 4), as well as derivatives of Cp2TiCl2 1, with nucleic acids, nucleic acid constituents and proteins. These studies were carried out in order to identify the biologically active species and more fully understand the molecular level mechanism of action of the antitumour metallocenes, in particular Cp2TiCl2 1, which is currently undergoing phase II clinical trials. The interactions of Cp2MoCl2 4 with four oligonucleotides were studied by 1H and 31P NMR spectroscopy. In 50 mM salt solutions of Cp2MoCl2 4, hydrolysis of the halide ligands occurred to give a solution with pD -2, containing a species in which both Cp rings remain metal bound for 24 h. At pD -7, partial hydrolysis of the Cp rings (-30percent) occurred after 24 h. Addition of an aqueous solution of Cp2MoCl2 4 in 50 mM salt to the self-complementary sequence d(CGCATATGCG)2, maintaining the pD at 6.0-7.0, showed no evidence for the formation of a metallocene-oligonucleotide complex and only peaks arising from hydrolysis of Cp2MoCl2 4 were detected. A similar result was obtained in titration experiments with the single stranded sequence d(ATGGTA) at pD 6.5-7.0. However, at pD 3.0, new signals assigned to a molybdocene-oligonucleotide complex(es), which was stable for hours at pD 3.0, were detected; while at pD -7 the complex is destabilised and only peaks arising from hydrolysis of Cp2MoCl2 4 were detected. Titration experiments at low pD with Cp2MoCl2 4 and the dinucleotide dCG were consistent with formation of a complex arising due to coordination of molybdenum to guanine N7 and/or cytosine N3. The results obtained showed that stable oligonucleotide adducts were not formed in 50 mM salt at pD -7 and hence it is highly unlikely that formation of molybdocene-DNA adducts in vivo is the primary action that is responsible for the antitumour properties of Cp2MoCl2 4. The rate of hydrolysis of the aromatic rings of Cp2TiX2 (X equals Cl 1, OCOCH2NH3Cl 27) and the dimethylsubstituted derivatives (MeCp)2TiX2 (X equals Cl 34, OCOCH2NH3Cl 41), in aqueous solutions at pD 2-8 was studied by 1H NMR spectroscopy. Rapid hydrolysis of both the halide/glycine and Cp ligands in Cp2TiX2 (X equals Cl 1, OCOCH2NH3Cl 27) occurred and predominantly gave a precipitate at pD -7. In contrast, under the same experimental conditions, the predominant species present in aqueous solutions of (MeCp)2TiX2 (X equals Cl 34, OCOCH2NH3Cl 41) at pH 2-8 contained both MeCp rings metal bound. At pD < 5, Cp2TiX2 (X equals Cl 1, OCOCH2NH3Cl 27) and (MeCp)2TiX2 (X equals Cl 34, OCOCH2NH3Cl 41) formed similar complex(es) with purine nucleotides. However, at pD >5, stable adducts between nucleotides and Cp2TiX2 (X equals Cl 1, OCOCH2NH3Cl 27) were not formed. In contrast, (MeCp)2TiX2 (X equals Cl 34, OCOCH2NH3Cl 41) formed complex(es) with 5'-dAMP or 5'-dGMP, which were stable for 24 h. These results suggest that formation of stable chelates between (MeCp)2TiX2 (X equals Cl 34, OCOCH2NH3Cl 41) and nucleic acid constituents in vivo is possible. However, the methyl substituted derivatives 34 and 41 did not show any antitumour activity against EAT in mice when administered in either 10percentDMSO/90percentsaline or in water at pH 6.2-6.4, which suggests that the labile Cp-Ti bond present in Cp2TiCl2 1 is required for antitumour activity. The synthesis of a range of Cp substituted titanocene derivatives was investigated in an attempt to prepare derivatives with modified Cp stability in comparison to the methyl substituted derivatives. The synthesis of derivatives (CpCH2Y)2TiCl2 where Y equals ?CHO 43, ?CONMe2 44, ?NO2 45, (RCp)2TiCl2 where R equals ?COMe 46, ?COOMe 47 or ?CONMe2 48, (CpNMe2)2TiCl2 62 and (Cp(CH2)2NMe2)2TiCl2 63 was unsuccessful, due to the presence of coordinating substituents on the Cp rings and poor stability in polar, protic solvents. Hence, these derivatives were excluded from further studies. The rate of hydrolysis of the Cp rings of Cp2TiX2 (X equals Cl 1, OCOCCl3 22 and OCOCH2NH3Cl 27) in aqueous solutions, 10percentDMSO/90percentD2O and 100percent DMSO was monitored by 1H NMR spectroscopy. Rapid hydrolysis of both the carboxylate and Cp ligands of Cp2TiX2 (OCOCCl3 22 and OCOCH2NH3Cl 27) occurred in DMSO to give biologically inactive species. The rate of these reactions were concentration dependent as dilution of these samples with saline or water to give the therapeutic conditions of 10percentDMSO/90percentD2O slowed the hydrolysis chemistry. In contrast, samples of Cp2TiX2 (X equals Cl 1 and OCOCH2NH3Cl 27) dissolved in water, gave solutions containing the presumed antitumour active species in which the halide or glycine ligands have been hydrolysed but the Cp rings remain metal bound. Thus, charged X ligands may be incorporated into Cp2TiX2 and will give comparable activity to Cp2TiCl2 1 provided the samples are administered in water. The antitumour metallocenes Cp2MCl2 (M equals Ti 1, V 2, Nb 3, Mo 4) and the inactive derivative (MeCp)2TiCl2 34 were found to inhibit the relaxation of supercoiled plasmid DNA pBR322 by human topoisomerase II in vitro. These results implicated the inhibition of topoisomerase II in the mechanism of antitumour activity although there was no direct correlation between the in vitro results with biological activity against EAT in vivo. UV spectroscopy confirmed that the metallocenes Cp2MCl2 (M equals Ti 1, Mo 4) became associated with and were stabilised to hydrolysis by calf thymus DNA but not with human serum albumin. ICP-AES was used to measure the amount of metal associated with either DNA or human serum albumin after incubation with Cp2MCl2 (M equals Ti 1, Nb 3, Mo 4) and dialysis of these solution. The results confirmed that DNA stabilises or becomes associated with the metallocenes. However, errors associated with the ICP-AES measurements did not allow these results to be quantified. 1H NMR spectroscopy was used to show that the antitumour metallocene Cp2MoCl2 4 formed an adduct with glutathione 72 in the pH range 3-7 through the sulfur donor group. In comparison, the antitumour metallocenes Cp2MCl2 (M equals Ti 1, Nb 3) showed limited adduct formation with glutathione 72 at pH -3 and no adducts were detected at pH > 5.5.

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3

Mokdsi, George. "Antitumour Metallocenes." University of Sydney. Chemistry, 2000. http://hdl.handle.net/2123/794.

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This thesis reports a study of the chemical stability and coordination chemistry of several antitumour metallocenes Cp2MCl2 (Cp = h5-C5H5; M = Ti 1, V 2, Nb 3, Mo 4), as well as derivatives of Cp2TiCl2 1, with nucleic acids, nucleic acid constituents and proteins. These studies were carried out in order to identify the biologically active species and more fully understand the molecular level mechanism of action of the antitumour metallocenes, in particular Cp2TiCl2 1, which is currently undergoing phase II clinical trials. The interactions of Cp2MoCl2 4 with four oligonucleotides were studied by 1H and 31P NMR spectroscopy. In 50 mM salt solutions of Cp2MoCl2 4, hydrolysis of the halide ligands occurred to give a solution with pD -2, containing a species in which both Cp rings remain metal bound for 24 h. At pD -7, partial hydrolysis of the Cp rings (-30percent) occurred after 24 h. Addition of an aqueous solution of Cp2MoCl2 4 in 50 mM salt to the self-complementary sequence d(CGCATATGCG)2, maintaining the pD at 6.0-7.0, showed no evidence for the formation of a metallocene-oligonucleotide complex and only peaks arising from hydrolysis of Cp2MoCl2 4 were detected. A similar result was obtained in titration experiments with the single stranded sequence d(ATGGTA) at pD 6.5-7.0. However, at pD 3.0, new signals assigned to a molybdocene-oligonucleotide complex(es), which was stable for hours at pD 3.0, were detected; while at pD -7 the complex is destabilised and only peaks arising from hydrolysis of Cp2MoCl2 4 were detected. Titration experiments at low pD with Cp2MoCl2 4 and the dinucleotide dCG were consistent with formation of a complex arising due to coordination of molybdenum to guanine N7 and/or cytosine N3. The results obtained showed that stable oligonucleotide adducts were not formed in 50 mM salt at pD -7 and hence it is highly unlikely that formation of molybdocene-DNA adducts in vivo is the primary action that is responsible for the antitumour properties of Cp2MoCl2 4. The rate of hydrolysis of the aromatic rings of Cp2TiX2 (X equals Cl 1, OCOCH2NH3Cl 27) and the dimethylsubstituted derivatives (MeCp)2TiX2 (X equals Cl 34, OCOCH2NH3Cl 41), in aqueous solutions at pD 2-8 was studied by 1H NMR spectroscopy. Rapid hydrolysis of both the halide/glycine and Cp ligands in Cp2TiX2 (X equals Cl 1, OCOCH2NH3Cl 27) occurred and predominantly gave a precipitate at pD -7. In contrast, under the same experimental conditions, the predominant species present in aqueous solutions of (MeCp)2TiX2 (X equals Cl 34, OCOCH2NH3Cl 41) at pH 2-8 contained both MeCp rings metal bound. At pD < 5, Cp2TiX2 (X equals Cl 1, OCOCH2NH3Cl 27) and (MeCp)2TiX2 (X equals Cl 34, OCOCH2NH3Cl 41) formed similar complex(es) with purine nucleotides. However, at pD >5, stable adducts between nucleotides and Cp2TiX2 (X equals Cl 1, OCOCH2NH3Cl 27) were not formed. In contrast, (MeCp)2TiX2 (X equals Cl 34, OCOCH2NH3Cl 41) formed complex(es) with 5'-dAMP or 5'-dGMP, which were stable for 24 h. These results suggest that formation of stable chelates between (MeCp)2TiX2 (X equals Cl 34, OCOCH2NH3Cl 41) and nucleic acid constituents in vivo is possible. However, the methyl substituted derivatives 34 and 41 did not show any antitumour activity against EAT in mice when administered in either 10percentDMSO/90percentsaline or in water at pH 6.2-6.4, which suggests that the labile Cp-Ti bond present in Cp2TiCl2 1 is required for antitumour activity. The synthesis of a range of Cp substituted titanocene derivatives was investigated in an attempt to prepare derivatives with modified Cp stability in comparison to the methyl substituted derivatives. The synthesis of derivatives (CpCH2Y)2TiCl2 where Y equals ?CHO 43, ?CONMe2 44, ?NO2 45, (RCp)2TiCl2 where R equals ?COMe 46, ?COOMe 47 or ?CONMe2 48, (CpNMe2)2TiCl2 62 and (Cp(CH2)2NMe2)2TiCl2 63 was unsuccessful, due to the presence of coordinating substituents on the Cp rings and poor stability in polar, protic solvents. Hence, these derivatives were excluded from further studies. The rate of hydrolysis of the Cp rings of Cp2TiX2 (X equals Cl 1, OCOCCl3 22 and OCOCH2NH3Cl 27) in aqueous solutions, 10percentDMSO/90percentD2O and 100percent DMSO was monitored by 1H NMR spectroscopy. Rapid hydrolysis of both the carboxylate and Cp ligands of Cp2TiX2 (OCOCCl3 22 and OCOCH2NH3Cl 27) occurred in DMSO to give biologically inactive species. The rate of these reactions were concentration dependent as dilution of these samples with saline or water to give the therapeutic conditions of 10percentDMSO/90percentD2O slowed the hydrolysis chemistry. In contrast, samples of Cp2TiX2 (X equals Cl 1 and OCOCH2NH3Cl 27) dissolved in water, gave solutions containing the presumed antitumour active species in which the halide or glycine ligands have been hydrolysed but the Cp rings remain metal bound. Thus, charged X ligands may be incorporated into Cp2TiX2 and will give comparable activity to Cp2TiCl2 1 provided the samples are administered in water. The antitumour metallocenes Cp2MCl2 (M equals Ti 1, V 2, Nb 3, Mo 4) and the inactive derivative (MeCp)2TiCl2 34 were found to inhibit the relaxation of supercoiled plasmid DNA pBR322 by human topoisomerase II in vitro. These results implicated the inhibition of topoisomerase II in the mechanism of antitumour activity although there was no direct correlation between the in vitro results with biological activity against EAT in vivo. UV spectroscopy confirmed that the metallocenes Cp2MCl2 (M equals Ti 1, Mo 4) became associated with and were stabilised to hydrolysis by calf thymus DNA but not with human serum albumin. ICP-AES was used to measure the amount of metal associated with either DNA or human serum albumin after incubation with Cp2MCl2 (M equals Ti 1, Nb 3, Mo 4) and dialysis of these solution. The results confirmed that DNA stabilises or becomes associated with the metallocenes. However, errors associated with the ICP-AES measurements did not allow these results to be quantified. 1H NMR spectroscopy was used to show that the antitumour metallocene Cp2MoCl2 4 formed an adduct with glutathione 72 in the pH range 3-7 through the sulfur donor group. In comparison, the antitumour metallocenes Cp2MCl2 (M equals Ti 1, Nb 3) showed limited adduct formation with glutathione 72 at pH -3 and no adducts were detected at pH > 5.5.

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4

Mäkelä-Vaarne, Nora. "Characterisation of group 4 metallocenes and metallocene catalysts : UV/VIS spectroscopic study." Helsinki : University of Helsinki, 2003. http://ethesis.helsinki.fi/julkaisut/mat/kemia/vk/makela-vaarne/.

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5

Barlow, Stephen. "Studies of oligomeric metallocenes." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308613.

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6

Soria-Alvarez, Carmen. "Synthetic applications of polar metallocenes." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614902.

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Garabatos-Perera, Jose Ramon. "En route to multi-bridged metallocenes." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=980450896.

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8

Hill, Jeremy Nicholas. "Laser-induced fluorescence of reactive metallocenes." Thesis, University of York, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357048.

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Stokes, Francesca Alice. "Synthetic applications of polar transition metal metallocenes." Thesis, University of Cambridge, 2013. https://www.repository.cam.ac.uk/handle/1810/264975.

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Since the sandwich structure of ferrocene was elucidated in 1952, metallocenes have generated a vast amount of interest. Transition metal metallocenes have previously been shown to be suitable precursors in the syntheses of novel organometallic and metallo-organic complexes, although the use of metal halide starting materials for organometallic synthesis is much more common due to their being readily commercially available and generally easier to handle than the extremely air- and moisture-sensitive metallocene alternatives. In this project, the polar transition metal metallocenes Cp2V, Cp2Cr, Cp2Mn and Cp2Ni were employed as precursors in the synthesis of fourteen novel metal containing complexes, in several cases generating products which could not have been obtained using metal halide starting materials.

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10

Spikes, Geoffrey. "Reactivity studies of some Ti-based metallocenes." Thesis, University of Sussex, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398353.

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Books on the topic "Metallocenes"

1

Antonio, Togni, and Halterman Ronald L, eds. Metallocenes. Weinheim: Wiley-VCH, 1998.

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Patil, Abhimanyu O., and Gregory G. Hlatky, eds. Beyond Metallocenes. Washington, DC: American Chemical Society, 2003. http://dx.doi.org/10.1021/bk-2003-0857.

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Antonio, Togni, and Halterman Ronald L, eds. Metallocenes: Synthesis, reactivity, applications. Weinheim: Wiley-VCH, 1998.

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Long, Nicholas J. Metallocenes: An introduction to sandwich complexes. Oxford, OX: Blackwell Science, 1998.

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Hapke, Marko, and Martin Kotora, eds. Metallocenes in Regio- and Stereoselective Synthesis. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-57381-1.

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6

T, Takahashi, and Kanno K, eds. Metallocenes in regio- and stereoselective synthesis. Berlin: Springer, 2005.

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7

1952-, Patil Abhimanyu O., Hlatky Gregory G. 1956-, American Chemical Society. Division of Polymeric Materials: Science and Engineering, and American Chemical Society Meeting, eds. Beyond metallocenes: Next-generation polymerization catalysts. Washington, DC: American Chemical Society, 2003.

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8

Schlechter, Melvin. Metallocene elastomers/TPEs. Norwalk, CT: Business Communications Co., 1996.

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9

Limited, Rapra Technology, ed. Metallocene technology: A one-day seminar. Shrewsbury: Rapra Technology Ltd., 1997.

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Luttikhedde, Hendrik J. G. Structural variations in group IV bis(indenyl) metallocenes. [s.l.]: [s.n.], 1998.

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Book chapters on the topic "Metallocenes"

1

Schlögl, Karl. "Stereochemistry of Metallocenes." In Topics in Stereochemistry, 39–91. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470147108.ch2.

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2

Bozak, R. E. "Photochemistry in the Metallocenes." In Advances in Photochemistry, 227–44. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470133385.ch5.

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Ašperger, Smiljko. "Metallocenes, Strong Electron Donors." In Chemical Kinetics and Inorganic Reaction Mechanisms, 261–79. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4419-9276-5_10.

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Patil, Abhimanyu O., and Gregory G. Hlatky. "Beyond Metallocenes: Next-Generation Polymerization Catalysts." In ACS Symposium Series, 1–11. Washington, DC: American Chemical Society, 2003. http://dx.doi.org/10.1021/bk-2003-0857.ch001.

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Klapper, Markus, Matthias Koch, Martin Stork, Nicolai Nenov, and Klaus Müllen. "Reversibly Crosslinked Polystyrene as a Support for Metallocenes Part I: Covalently Bonded Metallocenes and Functionalized Supports." In Organometallic Catalysts and Olefin Polymerization, 387–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59465-6_34.

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Takahashi, Tamotsu, and Ken-ichiro Kanno. "Carbon-Carbon Bond Cleavage Reaction Using Metallocenes." In Topics in Organometallic Chemistry, 217–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/b96004.

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Clayden, Nigel J., Christopher M. Dobson, Stephen J. Heyes, and Philip J. Wiseman. "2H NMR Studies of Metallocenes in Host Lattices." In Inclusion Phenomena in Inorganic, Organic, and Organometallic Hosts, 65–68. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3987-5_7.

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Albright, Thomas A., Jesus P. Lopez, and Jerome Silvestre. "Molecular Orbital Calculations on Metallocenes with Unusual Geometries." In Quantum Chemistry: The Challenge of Transition Metals and Coordination Chemistry, 341–50. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4656-9_24.

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Pietrzykowski, Antoni, and WŁodzimierz Buchowicz. "Synthesis of Metallocenes Via Metathesis in Metal Coordination Spheres." In Advances in Organometallic Chemistry and Catalysis, 157–70. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118742952.ch12.

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Kaminsky, Walter, and Ralf Werner. "New C1-Symmetric Metallocenes for the Polymerization of Olefins." In Metalorganic Catalysts for Synthesis and Polymerization, 170–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-60178-1_16.

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Conference papers on the topic "Metallocenes"

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Hobson, L. J., and I. R. Butler. "Modified metallocenes for material science." In International Conference on Science and Technology of Synthetic Metals. IEEE, 1994. http://dx.doi.org/10.1109/stsm.1994.835485.

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Luzzi, David E. "Encapsulation of metallofullerenes and metallocenes in carbon nanotubes." In ELECTRONIC PROPERTIES OF MOLECULAR NANOSTRUCTURES: XV International Winterschool/Euroconference. AIP, 2001. http://dx.doi.org/10.1063/1.1426944.

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Ibar, J. P. "Smart Processing of Plastics Through Vibration Controlled Shear-Thinning and Orientation." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0632.

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Abstract This paper covers the technology of melt vibration during the molding of plastic material (more specifically at low frequency) to reduce the viscosity and ease processability and to produce orientation benefits. The effect of vibration frequency and amplitude on melt viscosity is explained in terms of shear-thinning criteria. The effect of pressure, temperature and cooling rate on shear-thinning is also reviewed to predict how these variables interfere with melt vibration. Applications to injection molding, extrusion and blow molding of uneasily processable plastic melts (such as metallocenes polyolefins) are suggested.

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Fagan, Solange B., D. L. Azevedo, J. Mendes Filho, and A. G. Souza Filho. "Encapsulation of Metallocenes in Single-Wall Carbon Nanotubes: an Ab Initio Study." In PHYSICS OF SEMICONDUCTORS: 28th International Conference on the Physics of Semiconductors - ICPS 2006. AIP, 2007. http://dx.doi.org/10.1063/1.2730246.

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Garcia-suarez, V�ctor, Jaime Ferrer, and Colin Lambert. "Electronic Properties of Metallocene Wires." In 2006 International Conference on Nanoscience and Nanotechnology. IEEE, 2006. http://dx.doi.org/10.1109/iconn.2006.340545.

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Tosunov, Ya K. "he effect of winter wheat seed treatment the growth regulator of Metallocene brands: Melafen-Na, Melafen-Na+B, Melafen-Na+Mo on production processes, productivity and grain quality." In Agrobiotechnology-2021. Publishing house RGAU-MSHA, 2021. http://dx.doi.org/10.26897/978-5-9675-1855-3-2021-127.

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The results of studies on the testing of three brands of Metallocene showed that Melafen-Na+Mo was the most effective, the treatment of seeds with it provided a higher productive stem, the formation of larger in size, water content and grain weight, ears, increased yield and grain quality.

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Person, T. J., and R. F. Eaton. "Reduction of dissipation factor in power cable material systems containing metallocene- and post-metallocene-catalyzed polymers." In 2009 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP). IEEE, 2009. http://dx.doi.org/10.1109/ceidp.2009.5377776.

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Luo, Chuan, Shujun Dai, Fengping Ni, Chen Ruan, Haisong Ying, and Lifeng Yuan. "Study on identification method of imported metallocene catalyzed polyethylene." In Eighth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2022), edited by Thanikaivelan Palanisamy and Lim Boon Han. SPIE, 2023. http://dx.doi.org/10.1117/12.2673018.

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Suh Joon Han and Lawrence H. Gross. "Crosslinking and electrical characterization of metallocene linear low density polyethylene." In 2007 Electrical Insulation Conference and Electrical Manufacturing Expo (EIC/EME). IEEE, 2007. http://dx.doi.org/10.1109/eeic.2007.4562593.

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"Fractionation and Crystallization of Isotactic Polypropylenes Prepared Using Homogenous Metallocene Catalyst." In International Conference on Advances in Science, Engineering, Technology and Natural Resources. International Institute of Chemical, Biological & Environmental Engineering, 2015. http://dx.doi.org/10.15242/iicbe.c0815043.

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Reports on the topic "Metallocenes"

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Lukens, Jr., Wayne Wendell. Trivalent metallocene chemistry of some uranium, titanium, and zirconium complexes. Office of Scientific and Technical Information (OSTI), May 1995. http://dx.doi.org/10.2172/111895.

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Phelps, D. K., J. R. Gord, B. S. Freiser, and M. J. Weaver. The Effects of Donor-Acceptor Electronic Interactions on the Rates of Gas-Phase Metallocene Electron-Exchange Reactions. Fort Belvoir, VA: Defense Technical Information Center, May 1991. http://dx.doi.org/10.21236/ada237459.

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Sofield, Chadwick Dean. Steric and electronic effects of 1,3-disubstituted cyclopentadienyl ligands on metallocene derivatives of Cerium, Titanium, Manganese, and Iron. Office of Scientific and Technical Information (OSTI), May 2000. http://dx.doi.org/10.2172/764394.

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