Effects of single and double bonds in linkers on colorimetric and fluorescent sensing properties of polyving akohol grafting rhodamine hydrazides.
Two rhodamine derivatives, N-mono-maleic acid amide-N'-rhodamine B hydrazide (MRBH) and N-mono-succinic acid amide-N'-rhodamine 6G hydrazide (SR6GH), were synthesized by amidation with maleic anhydride (MAH), succinic anhydride (SAH) and rhodamine B hydrazide, rhodamine 6G hydrazide, which were identified by FTIR, (1)H NMR and elemental analysis. Two water-soluble fluorescent materials (PVA-MRBH and PVA-SR6GH) were prepared via esterification reaction with N-mono-maleic acyl chloride amide-N'-rhodamine B hydrazide (MRBHCl) or N-mono-maleic acyl chloride amide-N'-rhodamine 6G hydrazide (SR6GHCl) and poly(vinyl alcohol) (PVA) in DMSO solution. The sensing behaviors of PVA-MRBH and PVA-SR6GH were explored by recording the fluorescence spectra in completely aqueous solution. Upon the addition of Cu(2+) and Fe(3+) ions to the aqueous solution of PVA-MRBH, visual color change from rose pink to amaranth and orange for Cu(2+) and Fe(3+) ions, respectively, and fluorescence quenching were observed. Titration of Cu(2+), Fe(3+), Cr(3+) or Hg(2+) into the aqueous solution of PVA-SR6GH, although they induced fluorescence enhancement, only Fe(3+) made the color changing from colorless to yellow. Moreover, other metal ions did not induce obvious changes to color and the fluorescence spectra.
Anhui Key Laboratory of Functional Coordination Compounds, School of Chemistry and Chemical Engineering, Anqing Normal University, Anqing, 246011, People's Republic of China, gengtongmou@aqtc.edu.cn.
Tong-Mou
TM
Geng
Xie
X
Wang
Zhu-Qing
ZQ
Wang
Tai-Jie
TJ
Chen
Hai
H
Zhu
Yu
Y
Wang
D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D003116:Color; D003124:Colorimetry; D003300:Copper / Q000032:analysis / Q000737:chemistry; D005456:Fluorescent Dyes / Q000737:chemistry*; D006834:Hydrazines / Q000737:chemistry*; D007501:Iron / Q000032:analysis / Q000737:chemistry; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D012235:Rhodamines / Q000737:chemistry*; D013997:Time Factors
D005456:Fluorescent Dyes; D006834:Hydrazines; D012235:Rhodamines; C543681:rhodamine B hydrazide; C026188:rhodamine 6G; D003300:Copper; D011142:Polyvinyl Alcohol; D007501:Iron