title: Impressive europium red emission induced by two-photon excitation for biological applications.
abstract: Three triazine-based europium(III) complexes were synthesized that demonstrated strong two-photon induced europium emission with a high two-photon absorption cross-section. The modified triazine ligand of complex 3 initiated over 100% enhancement of the two-photon absorption cross-section (σ(2): 320 GM) when compared with complex 1 (σ(2): 128 GM) in a solution of DMSO. Europium complex 3 is also stable in vitro, and power-dependence curves were obtained in vitro to confirm the two-photon-induced f-f emission in HeLa cells.
authors.affiliation: Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hum, Hong Kong SAR.
authors.forename: Wai-Sum
authors.initials: WS
authors.lastname: Lo
authors.forename: Wai-Ming
authors.initials: WM
authors.lastname: Kwok
authors.forename: Ga-Lai
authors.initials: GL
authors.lastname: Law
authors.forename: Chi-Tung
authors.initials: CT
authors.lastname: Yeung
authors.forename: Chris Tsz-Leung
authors.initials: CT
authors.lastname: Chan
authors.forename: Ho-Lun
authors.initials: HL
authors.lastname: Yeung
authors.forename: Hoi-Kuan
authors.initials: HK
authors.lastname: Kong
authors.forename: Chi-Hang
authors.initials: CH
authors.lastname: Chen
authors.forename: Margaret B
authors.initials: MB
authors.lastname: Murphy
authors.forename: Ka-Leung
authors.initials: KL
authors.lastname: Wong
authors.forename: Wing-Tak
authors.initials: WT
authors.lastname: Wong
mesh_terms: D004735:Energy Transfer; D005063:Europium / Q000737:chemistry*; D006367:HeLa Cells; D006801:Humans; D008024:Ligands; D049449:Luminescence; D008163:Luminescent Measurements; D057054:Molecular Imaging; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D017785:Photons; D011789:Quantum Theory; D013237:Stereoisomerism; D014227:Triazines / Q000737:chemistry
chemical_list: D008024:Ligands; D009942:Organometallic Compounds; D014227:Triazines; D005063:Europium