溴代环己烷发光性质的初探

Preliminary Study on Luminescence Properties of Bromocyclohexane

溴代环己烷(BCH)本身不能发射荧光、燐光,而其乙醇溶液则可能发射较强的荧光.λ_ex/λ_em=273/302 nm,且在一定浓度范围内,浓度与荧光强度有良好线性关系,表现出BCH与醇间有一定的反应属性.另一方面,无论是BCH本身,或其甲、乙醇、CCl_4溶液,都能在βCD作用下,在所得悬浊液中,不经除氧操作直接诱导出一定强度的室温燐光,其主峰位λ_ex/λ_em=246/428 nm.与此相反,相同实验条件下,苯或溴苯却均无类似的βCD-RTP发射现象.

Bromocyclohexane (BCH) can not emit fluorescence or phosphorescence by oneself, but its alcoholic solutions can give more intensive fluorescence(λex/λem = 273/302 nm), and there is a good linear relationship between fluorescence intensity and BCH concentration over a suitable range. This means that there is a reactivity between BCH and alcohols. What is more, the BCH and its solutions of CH3OH, C2H5OH or CC14 all can emit room temperature phosphorescence (RTP) signals (λex/λem = 246/428 nm) in the presence of β-CD, and the RTP intensity is increasing with the amount of BCH. By contrast, benzene and bromoben-zene, which have conjugated π electron systems in molecule, can not induce the similar CD-RTP emission under the same conditions.