title: Novel aluminum-BODIPY dyads: intriguing dual-emission via photoinduced energy transfer.
abstract: Three novel BODIPY-based heterodinuclear complexes, [salen(3,5-(t)Bu)2Al-(OC6H4-BODIPY)] (6), [salen(3,5-(t)Bu)2Al-(OC6F2H2-BODIPY)] (7), and [(mq)2Al-(OC6H4-BODIPY)] (8) (salen = N,N'-bis(salicylidene)ethylenediamine, BODIPY = 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene, and mq = methyl-8-quinolinolato) were prepared and characterized by multinuclear NMR spectroscopy. The specific structures of 6-8 were also determined by single crystal X-ray analysis. In particular, the salen-based heterodinuclear complexes 6 and 7 exhibited higher thermal stability (Td5 = 309 and 306 °C, respectively) than that of the closely related mononuclear aluminum or BODIPY compounds, except for 8. The UV/vis absorption and PL spectra for 6 and 7 indicated a significant photoinduced energy transfer from the aluminum-salen moiety to the BODIPY group in an intramolecular manner. Theoretical calculations revealed independent transition states of the aluminum-salen moiety or the BODIPY group in the Al(III)-BODIPY dyads, further supporting these experimental results.
authors.affiliation: Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon, Gangwon 24341, Republic of Korea. kangmunlee@kangwon.ac.kr.
authors.forename: Changho
authors.initials: C
authors.lastname: Sohn
authors.forename: Jisu
authors.initials: J
authors.lastname: Jeong
authors.forename: Ji Hye
authors.initials: JH
authors.lastname: Lee
authors.forename: Byung Hoon
authors.initials: BH
authors.lastname: Choi
authors.forename: Hyonseok
authors.initials: H
authors.lastname: Hwang
authors.forename: Gyun-Tack
authors.initials: GT
authors.lastname: Bae
authors.forename: Kang Mun
authors.initials: KM
authors.lastname: Lee
authors.forename: Myung Hwan
authors.initials: MH
authors.lastname: Park