Electronic structures of cumulene type carbyne model compounds: a typical example of one-dimensional quantum well

Hino, Shinjiro; Okada, Y.; Iwasaki, Kentaro; Kijima, Masashi; Shirakawa, Hideki

doi:10.1016/s0009-2614(03)00360-9

Cited by 28 publications

(19 citation statements)

References 10 publications

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“…The synthesis of the less stable cumulene appeared to be more difficult. Only short chains with two H atoms at each end have been found [ 64 – 65 ]. In a most recent study, carbon chains terminated with Pt atoms at their ends have been observed [ 66 ].…”

Section: Reviewmentioning

confidence: 99%

Chains of carbon atoms: A vision or a new nanomaterial?

Banhart¹

2015

Beilstein J. Nanotechnol.

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SummaryLinear strings of sp1-hybridized carbon atoms are considered as a possible phase of carbon since decades. Whereas the debate about the stability of the corresponding bulk phase carbyne continues until today, the existence of isolated chains of carbon atoms has meanwhile been corroborated experimentally. Since graphene, as the two-dimensional sp2-bonded allotrope of carbon, has become a vast field, the question about the importance of one-dimensional carbon became of renewed interest. The present article gives an overview of the work that has been carried out on chains of carbon atoms in the past one or two decades. The review concentrates on isolated chains of carbon atoms and summarizes the experimental observations to date. While the experimental information is still very limited, many calculations of the physical and chemical properties have been published in the past years. Some of the most important theoretical studies and their importance in the present experimental situation are reviewed.

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Section: Reviewmentioning

confidence: 99%

Chains of carbon atoms: A vision or a new nanomaterial?

Banhart¹

2015

Beilstein J. Nanotechnol.

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“…Dies lässt sich erklären, wenn man die p-Elektronen des Cumulens als "Teilchen im Kasten" betrachtet. [33,34] Die Energieniveaus e eines Elektrons in einem eindimensionalen Kasten sind (in atomaren Einheiten) gegeben durch Gleichung (1),wobei m die Quantenzahl der Zustände (Orbitale)…”

Section: Nimmt Das Legt Nahed Ass Nur Die Lumo-energie Von Derunclassified

Cumulen‐Rotaxane: Stabilisierung und Charakterisierung von [9]Cumulenen

et al. 2015

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Die Stabilisierung langer [n]Cumulene wird üblicherweise erreicht, indem sterischa nspruchsvolle "Schutzgruppen" an den Enden angebrachtw erden, welche die reaktive Kohlenstoffkette abschirmen. Wir stellen hier eine alternative Strategie vor:S tabilisierung durch Einfädeln der sp-Kohlenstoffkette in einen Phenanthrolin-basierten Makrocyclus.Dies führt zu stabilen [9]Cumulen-Rotaxanen, die es uns erlaubten, die Eigenschaften von [n]Cumulenen in Abhängigkeit von ihrer Länge in bis dato unerreichtem Detail zu untersuchen. Dabei nutzten wir quantitative UV/Vis-Spektroskopie,C yclovoltammetrie und dynamische Differenzkalorimetrie.D ie experimentellen Befunde kçnnen durch DFT-Rechnungen reproduziert und verstanden werden. Abbildung 1. Strukturen von [7]tBuPh, [9]tBuPh, [7]Mes und [9]Mes.

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“…For related literature, see: Hino et al (2003); Irngartinger & Jä ger (1976); Kminek et al (1993); Kuhn & Wallenfels (1938); Kuwatani et al (2005); Woolfson (1953). T = 90 K 0.20 Â 0.08 Â 0.03 mm…”

Section: Related Literaturementioning

confidence: 99%

“…Compounds with highly cumulative unsaturated carbon-carbon bonds are of interest because of their potential application for electronic and optical materials (Kminek et al, 1993;Hino et al, 2003). Hexapentaenes contain six collinear carbon atoms with five cumulative double bonds, and various derivatives have been synthesized (Kuhn & Wallenfels, 1938;Kuwatani et al, 2005).…”

Section: S1 Commentmentioning

confidence: 99%

1,1,6,6-Tetrakis(4-ethylphenyl)-1,2,3,4,5-hexapentaene

2007

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Key indicators: single-crystal X-ray study; T = 90 K; mean (C-C) = 0.003 Å; R factor = 0.058; wR factor = 0.166; data-to-parameter ratio = 17.2.The title compound, (4-EtC 6 H 4 ) 2 C C C C C C(4-EtC 6 H 4 ) 2 or C 38 H 36 , was prepared from 1,1,6,6-tetrakis(4ethylphenyl)-2,4-hexadiyne-1,6-diol by reduction with SnCl 2 in an acidic medium. The molecule has a centre of symmetry at the mid-point of the cumulative double bonds, in which longer and shorter bonds alternate.

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Electronic structures of cumulene type carbyne model compounds: a typical example of one-dimensional quantum well

Cited by 28 publications

References 10 publications

Chains of carbon atoms: A vision or a new nanomaterial?

Chains of carbon atoms: A vision or a new nanomaterial?

Cumulen‐Rotaxane: Stabilisierung und Charakterisierung von [9]Cumulenen

1,1,6,6-Tetrakis(4-ethylphenyl)-1,2,3,4,5-hexapentaene

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