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首页> 外文期刊>Chemistry: A European journal >C(20)Carbon clusters: Fullerene-boat-sheet generation, mass selection, photoelectron characterization
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C(20)Carbon clusters: Fullerene-boat-sheet generation, mass selection, photoelectron characterization

机译：C（20）碳团簇：富勒烯-舟片的生成，质量选择，光电子表征

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摘要

Electron-impact ionization in a time-of-flight mass spectrometer of C20H0-3Br14-12 probes-secured from C20H20 dodecabedrane by a "brute-force" bromination protocol-provided bromine-free C20H0-2(3) anions in amounts that allowed the clean mass-separation of the hydrogen-free C-20(-) ions and the photoelectron (PE) spectroscopic characterization as C-20 fullerene (electron affinity (EA)= 2.25 +/- 0.03 eV, vibrational progressions of 730 +/- 70). The extremely strained C-20 fullerene ions surfaced as kinetically rather stable entities (lifetime of at least the total flight time of 0.4ms); they only very sluggishly expel a C-2 unit. The HOMO and LUMO are suggested to be almost degenerate (Delta E= 0.27 eV). The assignment as a fullerene was corroborated by the PE characterization of the C-20 bowl (EA=2.17 +/- 0.03 eV, vibrational progression of 2060 +/- 50 cm(-1)) analogously generated from C20H10 corannulene (C20H10Br9-8 samples) and comparably stable. Highly resolved low-temperature PE spectra of the known C-20 ring (EA = 2.49 +/- 0.03 eV, vibrational progressions 2022 +/- 45 and 455 +/- 30 cm(-1)), obtained from graphite, display an admixture of, most probably, a bicyclic isomer (EA = 3.40 +/- 0.03 eV, vibrational progression 455 +/- 30 cm(-1)). The C-20(+(-)) and C20H2+ ((-)) cluster ions generated from polybrominated perylene (C20H0-2Br12-10) have (most probably) retained the planar perylene-type skeleton (sheet, EA = 2.47 +/- 0.03 eV, vibrational progressions of 2089 +/- 30 and 492 +/- 30 cm(-1) and EA = 2.18 +/- 0.03 eV, vibrational progressions of 2105 +/- 30 and 468 +/- 30 cm(-1)).
机译：在飞行时间质谱仪中，通过“强力”溴化方案从C20H20十二面体中获得的C20H0-3Br14-12探针的飞行时间电子轰击电离，提供的无溴阴离子C20H0-2（3）干净的无氢C-20（-）离子质量分离和光电子（PE）光谱表征为C-20富勒烯（电子亲和力（EA）= 2.25 +/- 0.03 eV，振动级数为730 + / -70）。极度应变的C-20富勒烯离子以动力学上相当稳定的形式浮出水面（寿命至少为0.4ms的总飞行时间）;他们只会非常缓慢地驱逐C-2部队建议HOMO和LUMO几乎是简并的（Delta E = 0.27 eV）。 C-20碗的PE表征（EA = 2.17 +/- 0.03 eV，振动级数为2060 +/- 50 cm（-1））证实了富勒烯的赋值，类似地从C20H10戊二烯（C20H10Br9-8）生成样本），并且相对稳定。从石墨获得的已知C-20环的高分辨低温PE光谱（EA = 2.49 +/- 0.03 eV，振动级数2022 +/- 45和455 +/- 30 cm（-1））显示出可能是双环异构体的混合物（EA = 3.40 +/- 0.03 eV，振动级数455 +/- 30 cm（-1））。由多溴per（C20H0-2Br12-10）生成的C-20（+（-））和C20H2 +（（-））簇离子（很可能）保留了平面per型骨架（片，EA = 2.47 + / -0.03 eV，振动级数为2089 +/- 30和492 +/- 30 cm（-1），EA = 2.18 +/- 0.03 eV，振动级数为2105 +/- 30和468 +/- 30 cm（- 1））。

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