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Theoretical and experimental studies of cationized uracil complexes in the gas phase

机译:气相阳离子化尿嘧啶配合物的理论和实验研究

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摘要

Cationized uracil clusters were generated in the gas phase by electrospray ionization (ESI). Mass spectrometry experiments showed that with particular experimental conditions, decameric uracil clusters are magic number clusters. MS/MS experiments demonstrated that the structure of these decameric uracil clusters depends substantially on the size and the charge of the cation. On the basis of the ab initio and density functional theory (OFT) quantum chemistry calculations, structures for these decameric clusters were proposed. These structures are in agreement with the experimental mass spectra of modified nucleobases. Theoretical calculations showed that complexes experimentally observed using ESI-MS techniques, are not naturally the most stable in the gas phase.
机译:通过电喷雾电离(ESI)在气相中生成了阳离子化的尿嘧啶簇。质谱实验表明,在特定的实验条件下,十聚尿嘧啶簇是幻数簇。 MS / MS实验表明,这些十聚尿嘧啶簇的结构主要取决于阳离子的大小和电荷。在从头算和密度泛函理论(OFT)量子化学计算的基础上,提出了这些十聚体簇的结构。这些结构与修饰的核碱基的实验质谱一致。理论计算表明,使用ESI-MS技术实验观察到的配合物在气相中自然不是最稳定的。

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