为了阐明广泛使用的增溶性苯氧基取代基对bi双酰亚胺(PBI)染料的结构和功能特性的影响,从1,7-二溴PBI制备了一系列1,7-二溴氧基PBI,它们具有氢,甲基,异丙基在苯氧基取代基的一个或两个邻位上的苯基取代基。尽管增加了空间拥堵,但所有双重芳族亲核取代反应仍可实现74-88%的高收率。溶液和固态的结构和光学性质用1进行了研究1 H NMR,UV-Vis吸收和荧光光谱,单晶X射线分析(四种结构)以及量子化学和力场计算。对于后者,我们使用了合适的力场,该力场正确地反映了PBI芯的刚度。我们的研究表明,这些染料倾向于在溶液中容纳略微扭曲的分子结构,该结构由1,7-氧和6,12-氢取代基之间的CH = O氢键支持。但是,由于势能表面较浅,分子可能会在堆积力的影响下以晶态平面化,这是通过对所有苯氧基邻位带有甲基或苯基取代基的两个衍生物进行单晶X射线分析得出的-位置。这样的取代基还适合包裹PBIπ
Perylene diimide (PDI) 3 and 4 appended with 8-hydroxyquinoline derivatives have been synthesized and their photophysical and spectroscopic properties have been experimentally determined. Moreover, PDIs 3 and 4 show ratiometric behavior to detect Cu2+ colorimetrically with visible color change from coral red to light pink, whereas 3 and 4 show “turn-off” behavior in fluorescence with lowest limit of detection 5 × 10−7 M. The PDI 3 could be further utilized for ratiometric CN− detection colorimetrically and as “turn-on” sensor for CN− detection fluorometrically with lowest limit of detection 8 × 10−6 M. The comparison of spectroscopic properties of PDI 1-4 highlights the importance of linking 8-hydroxyquinoline units on the PDI core at bay position for achieving Cu2+ recognition event into ratiometric signal.
Bay-substituted perylene bisimide dye with an undistorted planar scaffold and outstanding solid state fluorescence properties
作者:Mei-Jin Lin、Ángel J. Jiménez、Christian Burschka、Frank Würthner
DOI:10.1039/c2cc36719j
日期:——
Single crystal X-ray analysis reveals a flat perylene pi-scaffold for a perylenebisimide bearing bulky 2,6-diphenylphenoxy substituents at the 1,7 bay positions. The flat structure provides sharp vibronic progressions in the absorption and fluorescence spectra, the sterical shielding outstanding fluorescence quantum yields in the solid state.
Structure–property relationships for 1,7-diphenoxy-perylene bisimides in solution and in the solid state
作者:Ángel J. Jiménez、Mei-Jin Lin、Christian Burschka、Johannes Becker、Volker Settels、Bernd Engels、Frank Würthner
DOI:10.1039/c3sc52344f
日期:——
7-oxygen and the 6,12-hydrogen substituents. Because of the rather shallow potential energy surface, however, the molecules may planarize in the crystalline state under the influence of packing forces as revealed by single crystal X-ray analyses for two derivatives bearing methyl or phenyl substituents at all phenoxy ortho-positions. Such substituents are also suited to enwrap the PBI π-scaffold and
为了阐明广泛使用的增溶性苯氧基取代基对bi双酰亚胺(PBI)染料的结构和功能特性的影响,从1,7-二溴PBI制备了一系列1,7-二溴氧基PBI,它们具有氢,甲基,异丙基在苯氧基取代基的一个或两个邻位上的苯基取代基。尽管增加了空间拥堵,但所有双重芳族亲核取代反应仍可实现74-88%的高收率。溶液和固态的结构和光学性质用1进行了研究1 H NMR,UV-Vis吸收和荧光光谱,单晶X射线分析(四种结构)以及量子化学和力场计算。对于后者,我们使用了合适的力场,该力场正确地反映了PBI芯的刚度。我们的研究表明,这些染料倾向于在溶液中容纳略微扭曲的分子结构,该结构由1,7-氧和6,12-氢取代基之间的CH = O氢键支持。但是,由于势能表面较浅,分子可能会在堆积力的影响下以晶态平面化,这是通过对所有苯氧基邻位带有甲基或苯基取代基的两个衍生物进行单晶X射线分析得出的-位置。这样的取代基还适合包裹PBIπ