title: 2-{2-[4-(Dimethylamino)phenyl]-6-methyl-4H-pyran-4-ylidene}malononitrile: a colorimetric and fluorescent chemosensor for low pH values.
abstract: For developing intramolecular charge transfer (ICT) chemosensors for low pH values, 2-{2-[4-(dimethylamino)phenyl]-6-methyl-4H-pyran-4-ylidene}malononitrile (DPM) was designed and synthesized. The spectroscopic and pH-sensing properties of DPM were investigated by UV-Vis and fluorescence spectroscopy. This sensor exhibited a pH-dependent ratiometric absorption property in the range of pH 0-3, along with a reversible color change from yellow to colorless with increasing acid concentration. The fluorescence intensity of the sensor was increased with increasing pH within the pH range of 0-2.
authors: School of Applied Chemical Engineering, Chonnam National University, Gwangju 500-757, Republic of Korea.
authors: Dae-Young
authors: DY
authors: Kim
authors: Department of Chemistry and Institute of Basic Science, Chonnam National University, Gwangju 500-757, Republic of Korea.
authors: Jae Nyoung
authors: JN
authors: Kim
authors: School of Applied Chemical Engineering, Chonnam National University, Gwangju 500-757, Republic of Korea. Electronic address: hyungkim@jnu.ac.kr.
authors: Hyung Jin
authors: HJ
authors: Kim
mesh_terms: D003116:Color; D003124:Colorimetry / Q000379:methods*; D005456:Fluorescent Dyes / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D009570:Nitriles / Q000138:chemical synthesis / Q000737:chemistry*; D011714:Pyrans / Q000138:chemical synthesis / Q000737:chemistry*; D012996:Solutions; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
chemical_list: C000593949:2-(2-(4-(dimethylamino)phenyl)-6-methyl-4H-pyran-4-ylidene)malononitrile; D005456:Fluorescent Dyes; D009570:Nitriles; D011714:Pyrans; D012996:Solutions; C000945:dicyanmethane
keywords: Fluorescence sensor; Intramolecular charge transfer (ICT); Push–pull conjugate; pH sensor