Fluorescence of acetylenic hydrocarbons
Fluorescence of acetylenic hydrocarbons
复制标题
炔烃的荧光
DOI：
10.1063/1.438695
复制
发表时间：
1979
影响因子：
4.4
通讯作者：
F. Hirayama
中科院分区：
文献类型：
--
作者：
S. Hamai;F. Hirayama
在环己烷溶液中，从光激发的烷基化乙炔（从丙炔到1-，2-，3-和4-辛炔）中观察到半宽为6.5 kK的无结构荧光。1-炔系列（丙炔、1-丁炔、1-戊炔等）的发射最大值的那些都在370 nm处，并且2-、3-和4-炔系列（2-丁炔、3-己炔、4-辛炔等）的那些都在370 nm处。都在388 nm处，与分子中的碳原子数NC无关。荧光受到浓度猝灭，其效率对于1-炔比对于2-、3-和4-炔高得多。外推到零浓度的1-，2-，3-和4-炔的荧光量子产率被发现是独立的NC，分别为0.013，0.014，0.009和0.009。气相中的荧光光谱与溶液中的荧光光谱非常相似，除了轻微的蓝移（0.5 nm）。所观察到的排放被解释为起源于最低的单重激发态（？）炔类化合物
A structureless fluorescence with a half‐width of ∼6.5 kK has been observed from optically excited alkylated acetylenes (from propyne to 1‐, 2‐, 3‐, and 4‐octynes) in cyclohexane solution. The emission maxima of the 1‐alkyne series (propyne, 1‐butyne, 1‐pentyne, etc.) are all at 370 nm, and those of the 2‐, 3‐, and 4‐alkyne series (2‐butyne, 3‐hexyne, 4‐octyne, etc.) are all at 388 nm, regardless of the number of carbon atoms, NC, in the molecule. The fluorescence is subject to concentration quenching the efficiency of which is much higher for 1‐alkynes than for 2‐, 3‐, and 4‐alkynes. The fluoresence quantum yields, extrapolated to zero concentration, of 1‐, 2‐, 3‐, and 4‐alkynes are found to be independent of NC, and are 0.013, 0.014, 0.009, and 0.009, respectively. The fluorescence spectra in the vapor phase are very similar to those in solution except for a slight blue shift (by ∼5 nm). The observed emissions are interpreted as originating from the lowest singlet excited states (?) of the alkynes, the ...