Near-infrared luminescence of nine-coordinate neodymium complexes with benzimidazole-substituted 8-hydroxyquinolines

Inorganic Chemistry
Nail M ShavaleevJean-Claude G Bünzli

Abstract

A new class of benzimidazole-substituted 8-hydroxyquinoline ligands has been prepared that contain a monoanionic tridentate N,N,O-coordinating unit. These ligands form charge-neutral lanthanide complexes of the type [Ln(L-R) 3]. nH 2O or [Ln 2(L2) 3]. nH 2O ( n = 1-3) with early lanthanides from La (III) to Gd (III) inclusive. Crystallographic characterization was carried out for 11 complexes with 6 different ligands. In all of these structures, the lanthanide ion was found to be nine-coordinated by three ligands arranged in an "up-up-down" fashion around the metal center. The coordination environment can be described as a tricapped trigonal prism, with N atoms of quinoline rings occupying capping positions. Upon deprotonation of the ligand and complex formation, a new absorption band appears in the visible range of the spectrum with a maximum in the range of 466-483 nm and molar absorption coefficient of (7.2 - 18) x 10 (3) M (-1) cm (-1). Its origin is likely to be an intraligand phenolate-to-pyridyl charge transfer transition centered on the 8-hydroxyquinolate chromophore. Upon excitation in ligand absorption bands, new Nd (III) complexes display characteristic metal-centered luminescence in the near-infrared region from 850...Continue Reading

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Citations

Jan 28, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Nam Seob BaekJean-Claude G Bünzli
Jan 9, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Da ZhangPeng-Fei Yan
Oct 16, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Hai-Yun ShenJian-Zhong Cui
Jan 6, 2011·Chemistry : a European Journal·Emmanuel TerazziClaude Piguet
Jul 19, 2012·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Aurélie GuenetMir Wais Hosseini
Jun 11, 2009·Dalton Transactions : an International Journal of Inorganic Chemistry·Aline M NonatThorfinnur Gunnlaugsson
May 22, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Hai-Bing XuXiao-Ming Chen
Aug 25, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Gülay BozokluMarinella Mazzanti
Dec 22, 2009·Chemical Society Reviews·Svetlana V Eliseeva, Jean-Claude G Bünzli
Feb 8, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Wen-Hua SunCarl Redshaw
Apr 19, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Hai-Bing XuZhong-Ning Chen
May 15, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Huibo WeiChunhui Huang
Sep 26, 2012·Dalton Transactions : an International Journal of Inorganic Chemistry·David J LewisZoe Pikramenou
Feb 5, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Hao LiuWen-Hua Sun
Oct 2, 2021·Chemical Communications : Chem Comm·Chihiro Kachi-TerajimaYoichi Habata

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