Luminescent Coordination Glass: Remarkable Morphological Strategy for Assembled Eu(III) Complexes

Yuichi Hirai; Takayuki Nakanishi; Yuichi Kitagawa; Koji Fushimi; Tomohiro Seki; Hajime Ito; Hiroyuki Fueno; Kazuyoshi Tanaka; Toshifumi Satoh; Yasuchika Hasegawa

doi:10.1021/acs.inorgchem.5b00145

Luminescent Coordination Glass: Remarkable Morphological Strategy for Assembled Eu(III) Complexes

Inorg Chem. 2015 May 4;54(9):4364-70. doi: 10.1021/acs.inorgchem.5b00145. Epub 2015 Apr 15.

Affiliations

¹ †Faculty of Engineering, Hokkaido University, N13 W8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan.
² ‡Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan.

PMID: 25872587
DOI: 10.1021/acs.inorgchem.5b00145

Abstract

Syntheses of novel luminescent Eu(III) coordination glasses 1 ([Eu(hfa)3(o-dpeb)]2), 2 ([Eu(hfa)3(m-dpeb)]3), and 3 ([Eu(hfa)3(p-dpeb)]n) are reported. They are composed of Eu(III) ions, hexafluoroacetylacetonato (hfa) ligands, and unique bent-angled phosphine oxide (o-, m-, p-dpeb) ligands with ethynyl groups. Their coordination structures and glass formability are dependent on the regiochemistry of substitution in regard to the internal benzene core. Single-crystal X-ray analyses and DFT calculation reveals dinuclear, trinuclear, and polymer structures for Eu(III) coordination glasses 1, 2, and 3, respectively. Those compounds show characteristic glass-transition (Tg = 25-96 °C) and strong luminescence properties (ΦLn = 72-94%).