Photophysical and crystallographic study of three integrated pyrazolo[1,5-a]pyrimidine–triphenylamine systems
作者:Alexis Tigreros、Mario Macías、Jaime Portilla
DOI:10.1016/j.dyepig.2020.108730
日期:2021.1
for 4a, φ = 0.86 for 4b and φ = 0.83 for 4c. For these dyes, Lippert–Mataga correlation were used to estimate the difference between the excited and ground state dipole moments (Δμ), being 4b the one that suffer the bigger changes with a Δμ οf 26.9 D. Probe 4c is found to be useful as a fluorescent indicators for the qualitative sensing of water content in organic solvents. The solid-state emission
合成了三个具有三苯胺和吡唑并[1,5- a ]嘧啶部分4a-c的新的分子内电荷转移(ICT)荧光团,并通过X射线晶体学(XRC)解析了它们的结构。化合物4a,4b和4c在四方P 4 2 / n,三斜晶P -1和单斜晶P 2 1 / c空间群中结晶,计算出的CE-B3LYP结构能分别为-104.3,-125.6和-123.8 kJ / mol。 。取代基对4a-c分子和光物理性质的影响通过荧光,紫外可见,XRC和计算方法对溶液和固态进行了研究。2-苯基(4B)和2-茴香基(2C)的衍生物显示出更好的吸收系数(图4b,ε = 76400→119600中号-1厘米-1和4c中,ε = 66200→89200中号-1厘米-1比)4a中(2-ME,ε = 9933→21667中号-1厘米-1),而在不同的极性的溶剂的相对量子产率(φ)是高达φ= 0.98图4a,φ= 0.86对于图4b对于4cφ