Spectroscopic Investigation of Dicyanovinylene Substituted Umbelliferone for Its Use as Selective Cyanide Sensor
In this study, a coumarin based organic chemosensor bearing dicyanovinylene group has been used for the detection of CN- anion found in many living areas as environment and nature pollutant. 7-hydroxycoumarin also known as umbelliferone has been derivatized at the 3-position with dicyanovinylene group. Molecular designation of the molecule fits the donor-π-acceptor (D-π-A) systems. Here, hydroxy group at 7-position of umbelliferone is responsible for electron donation and dicyanovinylene group at 3-position is responsible for electron withdrawal. Structural characterization of the molecule has been accomplished by NMR and HRMS spectroscopic techniques. Absorption and emission spectra have been collected in the presence of various anions and the selective response in dimethylsulfoxide against CN- anion has been realized. Limit of detection (LOD) of probe molecule for CN- anions has been calculated as 1.54 μM showing that the molecule could be used as a successful cyanide probe.