Novel aluminum-BODIPY dyads: intriguing dual-emission viaphotoinduced energy transfer

Three novel BODIPY-based heterodinuclear complexes, [salen(3,5- super()tu) sub(2)Al-(OC sub(6)H sub(4)-BODIPY)] (6), [salen(3,5- super()tu) sub(2)Al-(OC sub(6)F sub(2)H sub(2)-BODIPY)] (7), and [(mq) sub(2)Al-(OC sub(6)H sub(4)-BODIPY)] (8) (salen = N,N'-bis(salicylidene)ethy lenediamine, BODIP...

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Published in:Dalton transactions : an international journal of inorganic chemistry 2016-03, Vol.45 (13), p.5825-5832
Main Authors: Sohn, Changho, Jeong, Jisu, Lee, Ji Hye, Choi, Byung Hoon, Hwang, Hyonseok, Bae, Gyun-Tack, Lee, Kang Mun, Park, Myung Hwan
Format: Article
Language:English
Subjects:
Absorption
Aluminum
Energy transfer
Mathematical analysis
NMR spectroscopy
Single crystals
Spectra
X-rays
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Summary:Three novel BODIPY-based heterodinuclear complexes, [salen(3,5- super()tu) sub(2)Al-(OC sub(6)H sub(4)-BODIPY)] (6), [salen(3,5- super()tu) sub(2)Al-(OC sub(6)F sub(2)H sub(2)-BODIPY)] (7), and [(mq) sub(2)Al-(OC sub(6)H sub(4)-BODIPY)] (8) (salen = N,N'-bis(salicylidene)ethy lenediamine, 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 (T sub(d5) = 309 and 306 degree 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 super(III)-BODIPY dyads, further supporting these experimental results.
ISSN:1477-9226
1477-9234
DOI:10.1039/c5dt05067g