The detection of anions has attracted considerable interest because of their importance in various physiological processes. In this study, two sulfonamide and urea-based compounds (1a and 1b) were successfully developed and their spectroscopic and anion recognition properties were fully investigated. These results showed that: (1) compounds showed high selectivity towards cyanide and fluoride ions in CH3CN; (2) compounds only exhibited a large change in fluorescence in the presence of cyanide ions in CH3CN-H2O (95:5, v/v); and (3) compound 1b could act as a gel in dimethyl sulfoxide that transforms into a homogeneous solution upon exposure to cyanide ions. This research suggests that sulfonamide and urea can act as hydrogen-bond donors and provides an alternative approach to the design of novel anion chemosensors. (C) 2015 Elsevier Ltd. All rights reserved.
Contrasting Self-Assembly and Gelation Properties among Bis-urea- and Bis-amide-Functionalised Dialkoxynaphthalene (DAN) π Systems
作者:Anindita Das、Suhrit Ghosh
DOI:10.1002/chem.201002208
日期:2010.12.10
Gelled together: Self‐assembly and gelation studies of bis‐urea‐ and bis‐amide‐functionalised dialkoxynaphthalene chromophores (DAN‐U and DAN‐A, respectively) revealed contrasting J‐ and H‐type aggregation properties in solution, respectively (see scheme). DAN‐U was found to be a “super‐gelator” with much higher thermal stability, whereas DAN‐A showed gelation with superior mechanical stability.
Synthesis and Solid-State Polymerization of 5-(Pyren-1-yl)penta-2,4-diyn-1-ol Derivatives with an <i>N</i>-Phenylurethane or <i>N</i>-Benzylurethane Group
dodecyl (m = 12), and hexadecyl (m = 16) groups. UponUVirradiation, a regular 1,4-addition polymerization to form polydiacetylene was confirmed for H-0, H-1, C8O-1, C12O-1, and C16O-1. For C1O-0 and C1O-1, the crystalstructures were solved, and the reasons the regular polymerization did not occur were clarified. From the powder X-ray diffraction study, crystallinities of CmO-1 were found to be lower
合成了一系列5-(吡啶-1-基)戊-2,4-二炔-1-基N-苯基氨基甲酸酯和N-苄基氨基甲酸酯。在苯基基团Ñ -苯基和ñ -苄基部分(分别为未取代的H-0和H-1分别)和(3,4,5-三烷氧基取代的C ^米-O-0和C ^米O-1 ,分别地),其中引入的烷基是甲基(m = 1),辛基(m = 8),十二烷基(m = 12)和十六烷基(m= 16)组。在UV辐射下,对于H-0,H-1,C 8 O-1,C 12 O-1和C 16 O-1,证实了常规的1,4-加成聚合形成聚二乙炔。对于C 1 O-0和C 1 O-1,解决了晶体结构,并且阐明了不发生规则聚合的原因。根据粉末X射线衍射研究,发现C m O-1的结晶度低于C m O-0的结晶度,尽管C mO-1定期聚合。这表明总结晶度与在聚合方向上一维阵列周围的局部排序不直接相关。聚合的C m O-1物种可溶于氯仿。它们的可加工性使我们能够制造聚二乙炔以及单体的流延膜。评估了C