title: Light-harvesting ytterbium(III)-porphyrinate-BODIPY conjugates: synthesis, excitation-energy transfer, and two-photon-induced near-infrared-emission studies.
abstract: Based on a donor-acceptor framework, several conjugates have been designed and prepared in which an electron-donor moiety, ytterbium(III) porphyrinate (YbPor), was linked through an ethynyl bridge to an electron-acceptor moiety, boron dipyrromethene (BODIPY). Photoluminescence studies demonstrated efficient energy transfer from the BODIPY moiety to the YbPor counterpart. When conjugated with the YbPor moiety, the BODIPY moiety served as an antenna to harvest the lower-energy visible light, subsequently transferring its energy to the YbPor counterpart, and, consequently, sensitizing the Yb(III) emission in the near-infrared (NIR) region with a quantum efficiency of up to 0.73% and a lifetime of around 40 μs. Moreover, these conjugates exhibited large two-photon-absorption cross-sections that ranged from 1048-2226 GM and strong two-photon-induced NIR emission.
authors.affiliation: Institute of Molecular Functional Materials (Areas of Excellence Scheme, University Grants, Committee, Hong Kong) and Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Hong Kong, PR China.
authors.forename: Tao
authors.initials: T
authors.lastname: Zhang
authors.forename: Xunjin
authors.initials: X
authors.lastname: Zhu
authors.forename: Wai-Kwok
authors.initials: WK
authors.lastname: Wong
authors.forename: Hoi-Lam
authors.initials: HL
authors.lastname: Tam
authors.forename: Wai-Yeung
authors.initials: WY
authors.lastname: Wong
mesh_terms: D001896:Boron Compounds / Q000737:chemistry*; D060326:Chemistry Techniques, Synthetic; D015195:Drug Design; D004735:Energy Transfer; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D017785:Photons; D011166:Porphyrins / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D015018:Ytterbium / Q000737:chemistry*
chemical_list: C095489:4,4-difluoro-4-bora-3a,4a-diaza-s-indacene; D001896:Boron Compounds; D009942:Organometallic Compounds; D011166:Porphyrins; D015018:Ytterbium