Enhanced deep-red luminescence of tris(hexafluoroacetylacetonato)samarium(III) complex with phenanthroline in solution by control of ligand coordination

The Journal of Physical Chemistry. a
Yasuchika HasegawaTsuyoshi Kawai

Abstract

The effect of solvent molecule on the emission properties of Sm(hfa)3(phen)2 (hfa = hexafluoroacetylacetonato, phen = phenanthoroline) was investigated using acetone, acetonitrile, and pyridine. 5G(5/2) --> 5H(9/2) transition intensities in pyridine were found to be larger than those in corresponding acetone and acetonitrile. The radiative rate constant in pyridine (4.8 x 10(2) s(-1)) was 2 times larger than those in acetonitrile (2.6 x 10(2) s(-1)) and acetone (2.3 x 10(2) s(-1)), although the nonradiative transition via vibrational relaxation (k(nr) = 1.7 x 10(4) s(-1)) in pyridine was the same as those in acetone and acetonitrile (k(nr) = 1.8 x 10(4) s(-1)), resulting in the enhanced emission quantum yield of Sm(III) complex in pyridine (2.7%). The coordination structures of Sm(hfa)3(phen)2 in acetonitrile, acetone, and pyridine were estimated by X-ray single-crystal analyses. These results indicate that enhancement of the emission properties in pyridine is due to faster radiative rate related to formation of asymmetrical nine-coordinated structure, Sm(hfa)3(phen)(py) (py = pyridine).

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Citations

Oct 30, 2015·Physical Chemistry Chemical Physics : PCCP·Bing LiPengfei Yan
Jun 3, 2015·Physical Chemistry Chemical Physics : PCCP·Tianyu ZhuPengfei Yan
Mar 25, 2018·Chemistry : a European Journal·Xiao-Qing GuoQing-Fu Sun
May 4, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Yoshinori OkayasuJunpei Yuasa
May 28, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Itziar OyarzabalEnrique Colacio
Apr 11, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Ning TangGuo-Hong Tao
Aug 1, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Pablo Martín-RamosJesús Martín-Gil
Jan 6, 2011·Chemistry : a European Journal·Kohei MiyataYasuchika Hasegawa
Dec 4, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Sergey ShuvaevNatalia Kuzmina
Mar 28, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Zubair Ahmed, Khalid Iftikhar
Mar 20, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·M Ramos SilvaJ Martín-Gil
Aug 16, 2013·Chemistry, an Asian Journal·Tatsuya NakamuraKazuya Kikuchi
Apr 24, 2012·Dalton Transactions : an International Journal of Inorganic Chemistry·Yusuke KuramochiYasuchika Hasegawa
Oct 31, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·P Martín-RamosJ Martín-Gil
Nov 17, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Hong-Feng LiGuang-Ming Li
Jun 24, 2014·Inorganic Chemistry·Takayuki NakanishiYasuchika Hasegawa

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