title: Selective FL quenching or enhancing of diimine ligands by guanine.
abstract: Diimine ligand (DL) 1 significantly exhibited the fluorescence quenching upon binding to guanine. Changing at the para-substituent of the phenyl ring from the hydroxyl to bromo groups reversely enhanced the fluorescence in the presence of guanine. The reverse in the fluorescence selectivity indicated the profound effect of the substituent at the para-position of the phenyl ring. The simple synthesis of DL 1 and DL 2 with good selectivity for guanine offers these DLs as promising compounds for chemosensors of other guanine derivatives.
authors.affiliation: Bioresources Research Unit, National Center for Genetic Engineering and Biotechnology (BIOTEC), Klong Luang, Pathumthani, Thailand. srung.sma@biotec.or.th
authors.forename: Srung
authors.initials: S
authors.lastname: Smanmoo
authors.forename: Shinya
authors.initials: S
authors.lastname: Kawasaki
authors.forename: Pramuan
authors.initials: P
authors.lastname: Tangboriboonrat
authors.forename: Takayuki
authors.initials: T
authors.lastname: Shibata
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Kabashima
authors.forename: Masaaki
authors.initials: M
authors.lastname: Kai
mesh_terms: D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry*; D006147:Guanine / Q000737:chemistry*; D007097:Imines / Q000737:chemistry*; D008024:Ligands; D015394:Molecular Structure; D013050:Spectrometry, Fluorescence
chemical_list: D005456:Fluorescent Dyes; D007097:Imines; D008024:Ligands; D006147:Guanine