In this study, we synthesized fluorescent sensors from rhodamine 6G derivatives and hydroxy coumarin. The synthetic routes to the rhodamine 6G derivatives containing hydroxy coumarin are shown in Fig. 1. Two derivatives were synthesized through Schiff base reactions. The structures of the new compounds were confirmed by melting point, 1H-NMR, and GC-MS analyses. The compounds were found to selectively bind to tin (Sn2+) ion by fluorescence titration using various metal cations. Longer carbon chains gave more sensitivity. Sn2+ ions exhibited the strongest fluorescence among the nime ions. The binding analysis using Job plots suggested that compounds form 1:1 complexes with the Sn2+ ions.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 재료 및 기기
  2.2. 실험방법
 3. 실험결과 및 토의
  3.1. 합성
  3.2. 물리적 특성
 4. 결 론
 REFERENCES

• 박성호(대구대학교 화학과, Department of Chemistry, Daegu University) | Seong Ho Park
• 장승현(대구대학교 화학과, Department of Chemistry, Daegu University) | Seung Hyun Chang Corresponding author