Modified 6-aza uridines: highly emissive pH-sensitive fluorescent nucleosides.

Modified 6-aza uridines: highly emissive pH-sensitive fluorescent nucleosides.
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DOI:
10.1002/cphc.201200375
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发表时间:
2012-10-08
期刊:
Chemphyschem : a European journal of chemical physics and physical chemistry
影响因子:
--
通讯作者:
Tor Y
Tor Y
中科院分区:
其他
文献类型:
--
作者:
Sinkeldam RW;Hopkins PA;Tor Y

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Optimized facile syntheses and highly desirable spectroscopic properties of two isomorphic fluorescent pyrimidines, comprising a 1,2,4-triazine motif conjugated to a thiophene (1a) or a furan (1b), are described. Although structurally related to their 5-modified uridine counterparts, these modified 6-aza-uridines reveal dramatically improved fluorescence properties and a remarkable sensitivity to polarity and pH changes. The thiophene derivative 1a has an absorption maximum around 335 nm, which upon excitation yields visible emission with a polarity sensitive maximum and fluorescence quantum yield ranging from 415 nm (Φ = 0.8) to 455 nm (Φ= 0.2) in dioxane and water, respectively. Nucleoside 1a also displays susceptibility to acidity. Correlating emission intensity and solution pH yields a pKa value of 6.7–6.9, reasonably close to physiological pH values. The results illustrate that highly sought-after fluorescence features (brightness and responsiveness) are not necessarily the trait of large fluorophores alone, but can be observed with probes that meet stringent isomorphic design criteria.
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