Synthesis and characterisation of nitro-, nitroso- and aminofluoranthenes
作者:C. J. van Haeringen、N. F. Aten、J. Cornelisse、J. Lugtenbarg
DOI:10.1002/recl.19921110701
日期:——
The synthesis is reported of the five mononitrofluoranthenes. 1-Nitrofluoranthene was synthesized in 20% from fluoranthene, 2-nitrofluoranthene in 24% from 1,2,3,10b-tetrahydrofluoranthene, 3-nitrofluoranthene in 13% from fluoranthene and 7- and 8-nitrofluoranthene in 34% from 1,2,3,10b-tetrahydrofluoranthene. The pure nitrofluoranthenes were converted into their nitroso and amino analogues. The nitrosopyrenes
Spectroscopic and photochemical properties of mononitropyrenes
作者:A. M. van den Braken-van Leersum、C. Tintel、M. van 't Zelfde、J. Cornelisse、J. Lugtenburg
DOI:10.1002/recl.19871060403
日期:——
The influence of the nitro group on the aromatic π-system of pyrene has been studied by comparing the spectroscopic and photochemicalproperties of the three mononitropyrenes. Whereas the UV and mass spectra of 1- and 4-nitropyrene show an interaction normal for nitro-aromatic compounds, this is not observed for 2-nitropyrene. The lack of interaction is reflected in a UV spectrum very similar to that
pyrene-dihydrophenazine dyad was prepared. Oxidation of the neutral species produced a bis(radical cation) species, which was characterized by the absorptions of their component radical cations in the visible region. A thermally accessible triplet state was observed in the ESR measurement in frozen n-PrCN. The energy gap between the singlet and triplet states was determined to be 2J/kB = −36 ± 3 K.
制备了新的pyr-二氢吩嗪二联体。中性物质的氧化产生了双(自由基阳离子)物质,其特征在于在可见光区域中它们的组分自由基阳离子的吸收。在冷冻n -PrCN的ESR测量中观察到热可及的三重态。单重态和三重态之间的能隙被确定为2 J / k B = -36±3 K.
Effect of the blocked-sites phenomenon on the heterogeneous reaction of pyrene with N<sub>2</sub>O<sub>5</sub>/NO<sub>3</sub>/NO<sub>2</sub>
To clarify whether the blocking reaction sites problem has a significant impact on heterogeneous reactions, experiments contrasting the order of pyrene (PY) particles' exposure to N2O5–O3 or O3–N2O5 in a heterogeneous process were conducted. Additionally, PY particles were exposed to N2O5 (∼8 ppm) in the presence of O3 (2.5–30 ppm) in a reaction chamber at ambient pressure and room temperature. Our
为了阐明阻塞反应位点问题是否会对异相反应产生重大影响,进行了实验,对比了of(PY)颗粒在异相过程中暴露于N 2 O 5 -O 3或O 3 -N 2 O 5的顺序。。此外,在环境压力和室温下,在反应室中存在O 3(2.5-30 ppm)的情况下,将PY颗粒暴露于N 2 O 5(〜8 ppm)。我们的结果表明,阻塞反应位点的现象可能在大气气溶胶颗粒和N 2 O 5的表面上普遍存在。气溶胶颗粒表面上的NO 3自由基引发的异质反应可促进离子引发的离子亲电硝化反应。我们还发现,有效的反应机理很大程度上取决于大气中一氧化氮的浓度。我们的结果提供了一个解释,说明为什么在以前的关于PY和PY异质反应的实验中未观察到2-硝基py(2-NPY)是气相和颗粒相中最普遍存在的硝基-多芳烃污染物之一。 N 2 O 5 / NO 3 / NO 2。
Jutz,C. et al., Chemische Berichte, 1969, vol. 102, p. 2301 - 2318