Metal Encapsulating Carbon Nanostructures from Oligoalkyne Metal Complexes

Dosa, Peter I.; Erben, Christoph; Iyer, Vivekanantan S.; Vollhardt, K. Peter C.; Wasser, Ian M.

doi:10.1021/ja9924602

Cited by 116 publications

(59 citation statements)

References 16 publications

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“…Reports of the latter reveal some serious shortcomings with respect to yield and/or degree of graphitization, extremity of conditions, need for specialized equipment, the requirement of co-reagents, and simplicity of starting materials. [1d, 5] We have described the solid-state thermolysis of a [Co 2 (CO) 6 ]-complexed tetrabenzodehydro [20]annulene and some of its substructures to form ordered carbon material, but this method shared some of these drawbacks, in as much as the highest yields were only about 60 %. The desired product consisted of an (at best) approximately equal mixture of multiwalled tubes (MWNTs) and carbon onions, and the starting alkyne ligands were somewhat esoteric.…”

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confidence: 99%

Near‐Quantitative Solid‐State Synthesis of Carbon Nanotubes from Homogeneous Diphenylethynecobalt and –Nickel Complexes

2003

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Carbon nanotubes (CNTs) have generated a tremendous amount of research interest because of their unique structural, electronic, magnetic, and mechanical properties. [1] Among the various synthetic methods employed for their preparation, chemical vapor deposition (CVD) has emerged to be most effective, and efforts are increasing in applying this technique to pre-growth device fabrication by utilizing (in particular lithographically) [2] patterned catalyst arrays and in situ tube assembly. [2,3] Crucial in this endeavor is the sitespecific batch production of ordered carbon with control of stoichiometry and ultimately morphology. One possible approach to achieving this would be the efficient thermal conversion of a defined, soluble, molecular organometallic precursor composed of both the carbon source and the metal catalyst, placed locospecifically by wetting and drying. Such a strategy would combine the advantages of the floating organometallic catalyst (for example, ferrocene, [Fe(CO) 5 ], etc.) CVD methodology [1d, 4] with a solid-state conversion of carbon precursors. Reports of the latter reveal some serious shortcomings with respect to yield and/or degree of graphitization, extremity of conditions, need for specialized equipment, the requirement of co-reagents, and simplicity of starting materials. [1d, 5] We have described the solid-state thermolysis of a [Co 2 (CO) 6 ]-complexed tetrabenzodehydro [20]annulene and some of its substructures to form ordered carbon material, but this method shared some of these drawbacks, in as much as the highest yields were only about 60 %. The desired product consisted of an (at best) approximately equal mixture of multiwalled tubes (MWNTs)

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confidence: 99%

Near‐Quantitative Solid‐State Synthesis of Carbon Nanotubes from Homogeneous Diphenylethynecobalt and –Nickel Complexes

2003

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“…Durch Pyrolyse der so erhaltenen Verbindung bei 800 8C isolierten sie große Mengen an Kohlenstoff-Nanozwiebeln sowie mehrwandige CNTs. [187] Auf ähnliche Weise stellten Bunz und Mitarbeiter durch Detonationssynthese eines Ferrocen-haltigen Dehydro- [18]annulens Kohlenstoff-Nanozwiebeln her. In diesen Umwandlungen war die supramolekulare Vororganisation der Moleküle essenziell, da nur einkristalline Proben, in denen die Acetylen-Kohlenstoffatome in Van-der-Waals-Kontakt miteinander standen, das gewünschte kohlenstoffreiche Material lieferten.…”

Section: Selbstorganisation Von Polycyclischen Aromatischen Kohlenwasunclassified

Nanostrukturierte Kohlenstoffmaterialien aus molekularen Vorstufen

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Nanostrukturierte Kohlenstoffmaterialien, also Kohlenstoffe, die eine charakteristische Größe im Nanometerbereich sowie eine eventuell funktionalisierte Oberfläche aufweisen, spielen eine zentrale Rolle in vielen wissenschaftlichen Disziplinen. Erste Anwendungen finden derartige Materialien dabei unter anderem in Bereichen wie der Erforschung alternativer Energiequellen, leistungsfähiger Energiespeichermaterialien, nachhaltiger chemischer Technologien oder auch im Gebiet der organisch‐elektronischen Materialien. Des Weiteren könnten diese Materialien mögliche Ansätze und Lösungen bieten, um dem voranschreitenden Verbrauch fossiler Brennstoffe und somit dem Klimawandel entgegenzusteuern. Ferner könnten nanostrukturierte Kohlenstoffmaterialien auch auf dem Gebiet der Mikroelektronik einen Durchbruch herbeiführen. Allerdings ist die Entwicklung neuer Herstellungsverfahren für kohlenstoffreiche Materialien unabdingbar, die unter anderem Kontrolle über die Oberflächenchemie, die mesoskopische Struktur und die Mikrostruktur ermöglichen. Ein vielversprechender Ansatz ist dabei die Synthese dieser Materialien aus wohldefinierten molekularen Vorstufen.

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“…It is of interest that metal carbonyls such as Co 2 (CO) 8 form complexes with polyionic ligands (such as ethynylbensene-Co 2 (CO) 6 ) and can be decomposed explosively [73] at 513 K (generating CH 4 and H 2 ) and at 1070 K (forming multilayer nanotubes). It is possible that a metallized polyione pyrolysis can lead to the single-wall nanotube formation too [74], just as the Fe(CO) 5 pyrolysis (at 1320 K) in the presence of other carbon sources [75].…”

Section: )mentioning

confidence: 99%

Controlled Pyrolysis of Metal‐Containing Precursors as a Way for Synthesis of Metallopolymer Nanocomposites

Pomogailo

Rozenberg

Джардималиева

2004

Metal–Polymer Nanocomposites

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The processes of thermal decomposition play an important role in various practical fields including metallurgy, mineral conversion processes, pyrogenic chemical technology, pyrolysis and thermal treatment of wood and coal, combustion of natural and synthetical fuels, coal carbonization, the prevention of grain spontaneous ignition, and so on. There is still a need for scientifically well-founded approaches to control the thermal decomposition of materials. Many studies focus attention on the chemical transformations and reactions in the pyrolized systems and on the creation of mathematical models of such processes as the major parts of the theory of chemical decomposition of complex substances.Thermolysis is widely used in the synthesis of nano-sized metallopolymer composites. This is a result of the specifics of the preparation of such materials. In spite of a variety of the methods for the preparation of metallopolymer nanocomposites, there are two principal routes: "bottom-up" and "top-down."

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Metal Encapsulating Carbon Nanostructures from Oligoalkyne Metal Complexes

Cited by 116 publications

References 16 publications

Near‐Quantitative Solid‐State Synthesis of Carbon Nanotubes from Homogeneous Diphenylethynecobalt and –Nickel Complexes

Near‐Quantitative Solid‐State Synthesis of Carbon Nanotubes from Homogeneous Diphenylethynecobalt and –Nickel Complexes

Nanostrukturierte Kohlenstoffmaterialien aus molekularen Vorstufen

Controlled Pyrolysis of Metal‐Containing Precursors as a Way for Synthesis of Metallopolymer Nanocomposites

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