Abstract

Spectacular color change during a chemical reaction is always fascinating. A variety of chemosensors including Schiff bases have been reported for selective as well as sensitive recognition of ions. This review explains the use of Schiff bases as color changing agents in the detection of anions. This magic of colors is attributed to change in the electronic structure of the system during reaction. Schiff base chemosensors are easy to synthesize, inexpensive and can be used for visual sensing of different ions. Development of Schiff base chemosensors is commonly based on the interactions between polar groups of Schiff bases and ionic species and the process of charge transfer, electron transfer and hydrogen bonding between Schiff bases and ionic species cause the color of the resultant to be changed. Therefore, designing of simple Schiff base chemosensors which are capable of selective sensing of different anions has attracted considerable interest. In particular, naked eye sensing through color change is important and useful since it allows sensing of ions through color changes without using any instrumental technique.

• Highlights

• Naked eye sensors are of much interest these days due to their visual detection properties rather employing complex instrumentation.

• Optical sensors are sensitive, selective, cost effective and robust.

• The magic of color change is fascinating factor in detection by these sensors.

• The color change may be attributed by interaction between anion and Schiff base by different mechanism i.e. electron transfer, charge transfer, hydrogen bonding, ICT etc.

• LOD data is an evidence of their great efficiency.

摘要

化学反应过程中壮观的颜色变化总是令人着迷。已经报道了包括席夫碱在内的多种化学传感器用于离子的选择性和灵敏识别。这篇综述解释了在阴离子检测中使用席夫碱作为变色剂。这种颜色的魔力归因于反应过程中系统电子结构的变化。席夫碱化学传感器易于合成，价格低廉，可用于不同离子的视觉传感。席夫碱化学传感器的开发通常是基于席夫碱的极性基团与离子物种之间的相互作用，以及席夫碱与离子物种之间的电荷转移、电子转移和氢键结合的过程导致产物颜色发生变化。所以，能够选择性感应不同阴离子的简单席夫碱化学传感器的设计引起了相当大的兴趣。特别是，通过颜色变化的肉眼感应是重要且有用的，因为它允许通过颜色变化感应离子，而无需使用任何仪器技术。

• 强调

• 如今，肉眼传感器由于其视觉检测特性而不是使用复杂的仪器而备受关注。

• 光学传感器灵敏、选择性、成本效益高且坚固耐用。

• 颜色变化的魔力是这些传感器检测的迷人因素。

• 颜色变化可能是由于阴离子和席夫碱通过不同的机制相互作用而引起的，即电子转移、电荷转移、氢键、ICT等。

• LOD 数据证明了它们的高效率。