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Title
Japanese: 
English:Unveiling a New Aspect of Simple Arylboronic Esters: Long-Lived Room-Temperature Phosphorescence from Heavy-Atom-Free Molecules 
Author
Japanese: 庄子良晃, Yasuhiro Ikabata, Qi Wang, 根本大輔, 坂本淳, 田中直樹, Junji Seino, Hiromi Nakai, 福島孝典.  
English: Yoshiaki Shoji, Yasuhiro Ikabata, Qi Wang, Daisuke Nemoto, atsushi sakamoto, Naoki Tanaka, Junji Seino, Hiromi Nakai, Takanori Fukushima.  
Language English 
Journal/Book name
Japanese: 
English:Journal of the American Chemical Society 
Volume, Number, Page vol. 139        p. 2728–2733
Published date Jan. 30, 2017 
Publisher
Japanese: 
English:American Chemical Society 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL http://pubs.acs.org/doi/abs/10.1021/jacs.6b11984
 
DOI https://doi.org/10.1021/jacs.6b11984
Abstract Arylboronic esters can be used as versatile reagents in organic synthesis, as represented by Suzuki–Miyaura cross-coupling. Here we report a serendipitous finding that simple arylboronic esters are phosphorescent in the solid state at room temperature with a lifetime on the order of several seconds. The phosphorescence properties of arylboronic esters are remarkable in light of the general notion that phosphorescent organic molecules require heavy atoms and/or carbonyl groups for the efficient generation of a triplet excited state. Theoretical calculations on phenylboronic acid pinacol ester indicated that this molecule undergoes an out-of-plane distortion at the (pinacol)B–Cipso moiety in the T1 excited state, which is responsible for its phosphorescence. A compound survey with 19 arylboron compounds suggested that the phosphorescence properties might be determined by solid-state molecular packing rather than by the patterns and numbers of boron substituents on the aryl units. The present finding may update the general notion of phosphorescent organic molecules.

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