A colorimetric chemosensors Sn2+ have been designed and synthesized by three steps. The spirolactam ring-opening process of rhodamine B is one of the most useful mechanisms for controlling fluorescence properties. Herein, new fluorescent chemosensors 1 and 2 based on rhodamine B containing phenothiazine derivertive were synthesized. They exhibit selective fluorescence enhancement behaviour in the presence of Sn2+ ion. Complexation between these compounds and the metal cations were confirmed through continuous variation method. It is observed that compounds 1, 2, and Sn2+ ion are complexed by 1:1 formation. Especially the proposed compounds 1 and 2 exhibit quick, simple and facile synthetic route.

Abstract
 1. 서 론
 2. 실험
  2.1. 실험방법
  2.2. 합성
 3. 결과 및 토의
  3.1. 합성
  3.2. 물리적 특성
 4. 결론
 REFERENCE

• 손문수(대구대학교 화학과) | Moon Su Son (Department of Chemistry, Daegu University)
• 장승현(대구대학교 화학과) | Seung Hyun Chang (Department of Chemistry, Daegu University) Corresponding author