Spectroscopic Evaluation of Novel Adenine/Thymine-Conjugated Naphthalenediimides: Preference of Adenine-Adenine over Thymine-Thymine Intermolecular Hydrogen Bonding in Adenine- and Thymine-Functionalized Naphthalenediimides
作者:Digambara Patra、Nadine Al Homsi、Sara Jaafar、Zeina Neouchy、Jomana Elaridi、Ali Koubeissi、Kamal H. Bouhadir
DOI:10.1007/s10895-018-02340-6
日期:2019.1
(adenine/thymine)-conjugated naphthalenediimides (NDIs), namely, NDI-AA, NDI-TT, and NDI-AT have been successfully achieved. NDI-AA, NDI-TT and NDI-AT have similar absorption in the 300–400 nm region. The effect of solvent on the absorption spectrum indicates aggregation, either through intermolecular π-σ interaction among the main chromophore or through intermolecular hydrogen bonding between adenine and adenine group
已经成功地实现了新型核碱基(腺嘌呤/胸腺嘧啶)-共轭萘二酰亚胺(NDI-AA),NDI-AA和NDI-AT的合成和光谱表征。NDI-AA,NDI-TT和NDI-AT在300-400 nm区域具有相似的吸收。溶剂对吸收光谱的影响表明是通过主要生色团之间的分子间π-σ相互作用或通过腺嘌呤和腺嘌呤基团之间的分子间氢键键合引起的聚集。加水无助于胸腺嘧啶-胸腺嘧啶之间的氢键形成,而是增加溶剂的极性会促进NDI-TT之间的π-σ相互作用。随着温度的升高,NDI-TT的光谱没有变化,这表明氢键在NDI-TT中没有发挥关键作用。对NDI-AA的荧光研究还建立了准分子形成以及基态聚集。随着溶剂混合物中水含量的增加,根据早期结果,由于腺嘌呤-腺嘌呤氢键,不鼓励NDI-AA聚集。同时,NDI-TT发射光谱不会移到蓝色区域,并且535 nm附近的峰强度增加,但以411 nm的荧光为代价。因此,由于胸腺嘧啶-胸腺嘧