• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Cooperative Recognition of a Copper Cation and Anion by a Calix[4]arene Substituted at the Lower Rim by a beta-Amino-alpha,beta-Unsaturated Ketone
【24h】

Cooperative Recognition of a Copper Cation and Anion by a Calix[4]arene Substituted at the Lower Rim by a beta-Amino-alpha,beta-Unsaturated Ketone

机译：β-氨基-α，β-不饱和酮取代下环的杯[4]芳烃对铜阳离子和阴离子的协同识别

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We report herein a new ditopic calix[4]arene receptor 25,27-bis{[4-amino-4-(1-naphthyl)-2-oxo-3-butenyl]oxy}-26,28-dihydroxyca lix[4]arene (2) for the simultaneous complexation of anionic and cationic species. The host molecule 25,27-bis{[3-(1-naphthyl)-5-isoxazolyl]methoxy}-26,28-dihydroxycalix[4]a rene (1) was synthesised first and was followed by a [Mo(CO)(6)]mediated ring-opening reaction to give the target receptor 2. The binding properties of ligands 1 and 2 towards metal ions in CH3CN were investigated by UV/Vis and fluorescence spectroscopies. The results showed that both ligands I and 2 were highly selective for Cu-II ions. Upon titration with Cu-II, the fluorescence of I was severely quenched, whereas 2 showed strong fluorescence enhancement because the metal ions help to lock the conformation of the fluorophores. During the complexation of 2 with Cu-II, the Cu-II was reduced to Cu-I by the free phenolic OH of 2, whereas the phenol was oxidised by Cu-II, after which it assisted in the trapping of Cu-I. Ditopic behaviour was observed for the complex 2 center dot Cu-I, which showed further enhancement of its fluorescence intensity upon complexation with anions such as acetate or fluoride.
机译：我们在这里报告一个新的ditopic杯[4]芳烃受体25,27-双{[4-氨基-4-（1-萘基）-2-氧代-3-丁烯基]氧基} -26,28-二羟基ca lix [4 ] arene（2）用于同时络合阴离子和阳离子物质。首先合成主体分子25,27-双{[3-（1-萘基）-5-异恶唑基]甲氧基} -26,28-二羟基杯[4] a烯（1），然后合成[Mo（CO ）（6）]介导的开环反应得到目标受体2。通过紫外/可见和荧光光谱研究了配体1和2对CH3CN中金属离子的结合特性。结果表明，配体I和2均对Cu-II离子具有高度选择性。用Cu-II滴定后，I的荧光被严重淬灭，而2则显示出强烈的荧光增强，因为金属离子有助于锁定荧光团的构象。在2与Cu-II的络合过程中，Cu-II被2的游离酚OH还原为Cu-I，而苯酚被Cu-II氧化，此后它有助于捕集Cu-I。对于络合物2中心点Cu-1，观察到了对位行为，当与阴离子如乙酸根或氟离子络合时，其荧光强度进一步增强。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号