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Multiple hydrogen bonds and tautomerism in naphthyridine derivatives

机译:萘啶衍生物中的多个氢键和互变异构

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The behaviour of three 2,7-disubstituted 1,8-naphthyridines able to exhibit tautomerism has been studied by NMR in solution and in two cases in the solid state.The three derivatives studied are 2,7-dihydroxy-(1),2-acetamido-7-amino-(3) and 2,7-diacetamido-l,8-naphthyridine (4).To explore the problem of secondary interactions,a series of complexes,with up to four simultaneous hydrogen bonds,where the monomers are generated using pyridine and 4-pyridone as building blocks,have been theoretically studied.The calculated interaction energies have been correlated with the number of hydrogen bonds and with attractive and repulsive secondary interactions.Further analysis of the electron density and orbital interactions shows that the secondary interactions,both attractive and repulsive,have a purely electrostatic origin.The X-ray structure of compounds 3 and 4 have been determined.In the solid state these compounds exist in the "diamino" tautomers with the N-H proton of the amido groups pointing towards the naphthyridine nitrogen.DFT and GIAO calculations have been essential to disentangle the problem of the structure of these compounds.
机译:通过溶液中的NMR研究了三种能够显示互变异构现象的2,7-二取代的1,8-萘啶的行为,在固态下的两种情况下都进行了研究。研究的三种衍生物是2,7-二羟基-(1),2 -acetamido-7-amino-(3)和2,7-diacetamido-1,8-naphthyridine(4)。为探讨次级相互作用的问题,提出了一系列配合物,它们具有多达四个同时存在的氢键,其中的单体对吡啶和4-吡啶酮作为结构单元生成了H2O2,对其相互作用能进行了理论研究。计算出的相互作用能与氢键数以及有吸引力的和排斥的次级相互作用有关。对电子密度和轨道相互作用的进一步分析表明,具有吸引力和排斥力的二次相互作用均来自纯静电。已确定化合物3和4的X射线结构。在固态下,这些化合物存在于带有酰胺基基团NH质子的“二氨基”互变异构体中。 DFT和GIAO计算对于弄清这些化合物的结构问题至关重要。

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