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N-nitrosation of N-acetyltryptophan probed by IR spectroscopy of the gaseous anion

机译:气态阴离子的红外光谱探测N-乙酰基色氨酸的N-亚硝化

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摘要

A stable N1-nitroso derivative of N-acetyltryptophan, [NANT-H], has been assayed by infrared multiple photon dissociation (IRMPD) in the 'fingerprint' range. IRMPD spectra, interpreted by DFT calculations, display features characteristic of the nitrosation motif, which lack in the native N-acetyltryptophan anion, [NAT-H]. The most stable [NANT-H] isomers, nicely accounting for the experimental features, present the carboxylic group interacting with the amide and benzene ring hydrogens. The side chain is oriented gauche with respect to the indole plane, while the NNO group may adopt either a syn (1ds, global minimum) or an anti (2da, 2.7 kJ mol ~1 higher in energy) configuration.
机译:N-乙酰色氨酸的一种稳定的N1-亚硝基衍生物[NANT-H]已通过“指纹”范围内的红外多光子离解(IRMPD)测定。用DFT计算解释的IRMPD光谱显示出亚硝化基序的特征,而天然N-乙酰色氨酸阴离子[NAT-H]则缺乏。最稳定的[NANT-H]异构体很好地说明了实验特征,其羧基与酰胺和苯环氢相互作用。侧链相对于吲哚平面取向为环状,而NNO基团可以采用syn(1ds,全局最小值)或anti(2da,能量高2.7 kJ mol〜1)构型。

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