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Intriguing Indium-salen Complexes as Multicolor Luminophores

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posted on 13.02.2017 by Seon Hee Lee, Nara Shin, Sang Woo Kwak, Kyunglim Hyun, Won Hee Woo, Ji Hye Lee, Hyonseok Hwang, Min Kim, Junseong Lee, Youngjo Kim, Kang Mun Lee, Myung Hwan Park
The series of novel salen-based indium complexes (3-tBu-5-R-salen)­In-Me (3-tBu-5-R-salen = N,N′-bis­(2-oxy-3-tert-butyl-5-R-salicylidene)-1,2-diaminoethane, R = H (1), tBu (2), Br (3), Ph (4), OMe (5), NMe2 (6)) and [(3-tBu-5-NMe3-salen)­In-Me]­(OTf)2 (7; OTf = CF3SO3) have been synthesized and fully characterized by NMR spectroscopy and elemental analysis. All indium complexes 17 are highly stable in air and even aqueous solutions. The solid-state structures for 35, which were confirmed by single-crystal X-ray analysis, exhibit square-pyramidal geometries around the indium center. Both the UV/vis absorption and PL spectra of 17 exhibit significant intramolecular charge transfer (ICT) transitions based on the salen moieties with systematically bathochromic shifts, which depend on the introduction of various kinds of substituents. Consequently, the emission spectra of these complexes cover almost the entire visible region (λem = 455–622 nm).