Electronic absorption spectra of linear C6, C8 and cyclic C10, C12 in neon matrices

Abstract

Erratum: "Electronic absorption spectra of carbon chain anions C 2n − (n=4-7) in neon matrices" [J.The electronic absorption spectra of the even-numbered carbon molecules C 6 -C 14 have been measured in neon matrices. Bare carbon anions were produced in a cesium sputter source, mass selected, codeposited with neon at 6 K, and neutralized. The spectra show, apart from the known ͑1͒ 3 ⌺ u Ϫ ←X 3 ⌺ g Ϫ transition of linear C 6 , C 8 , and C 10 in the visible, absorption bands in the UV region. The spectral data when considered in conjunction with ab initio calculations show that the linear forms of C 6 and C 8 have the next strong ͑2͒ 3 ⌺ u Ϫ ←X 3 ⌺ g Ϫ transition with band maximum near 238 and 277 nm, respectively, whereas the band systems of C 10 , C 12 , and C 14 at 316, 332, and 347 nm are due to the monocyclic species.

Angle‐Strained Cycloalkynes

“…Mass spectrometric techniques are usually employed to detect them after their generation, for example by laser evaporation of graphite or from stable organic precursors [102]. To study this unique form of carbon by electronic and/or vibrational spectroscopy in the gas phase or under matrix isolation conditions would be extremely interesting [103]. It has been estimated that the deformation of the bond angle at each sphybridized carbon atom of cyclo-C 18 112 amounts to ca.…”

Carbon‐Rich Compounds: Acetylene‐Based Carbon Allotropes

“…390 9 Carbon-Rich Compounds: Acetylene-Based Carbon Allotropes Figure 9.1 UV/Vis absorption spectra of laser-ablated carbon clusters C n trapped in a solid Ne matrix at 5 K (by T. W., collaboration with Prof. Dr. Takamasa Momose, Kyoto University). The assignment of bands by analogy with the literature [5,6,27,28]. The relatively sharp peak with an asterisk at 407 nm is the A 1 P u nX 1 S g + transition of C 3 [1,2,4,28].…”

“…For mass-selected C 10 -trapped in a solid Ne matrix, Grutter et al suggested that the UV band at 316 nm (see Figure 9.1) is attributable to cyclic C 10 rather than to linear C 10 [27]. The assignment is based on extrapolation of the calculated excitation energy for cyclic C 6 to the energy for cyclic C 10 at the MRD-CI (multi-reference single and double excitation configuration interaction) level of theory [24].…”

Raman and Fluorescence Spectra of Size-Selected, Matrix-Isolated C14 and C18 Neutral Carbon Clusters

“…Results from infrared spectroscopy [3][4][5] and surface-enhanced Raman spectroscopy 6,7 are available for neutral carbon clusters, but few experiments have been performed for molecules larger than C 13 . The linear isomers of neutral C 4 to C 10 have been verified by ESR measurements in neon matrixes. 8 In addition, electronic absorption spectra of matrix-isolated neutral C n clusters 9,10 have produced evidence of linear chain structures for C 4-C 10 and of cyclic structures for C 10-C 14 neutral species.…”