title: Intriguing Indium-salen Complexes as Multicolor Luminophores.
abstract: 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 1-7 are highly stable in air and even aqueous solutions. The solid-state structures for 3-5, 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 1-7 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).
authors.affiliation: Department of Chemistry Education, Chungbuk National University , Cheongju, Chungbuk 28644, Republic of Korea.
authors.forename: Seon Hee
authors.initials: SH
authors.lastname: Lee
authors.affiliation: Department of Chemistry and Institute for Molecular Science and Fusion Technology, Kangwon National University , Chuncheon, Gangwon 24341, Republic of Korea.
authors.forename: Nara
authors.initials: N
authors.lastname: Shin
authors.affiliation: Department of Chemistry, Chungbuk National University , Cheongju, Chungbuk 28644, Republic of Korea.
authors.forename: Sang Woo
authors.initials: SW
authors.lastname: Kwak
authors.affiliation: Department of Chemistry, Chungbuk National University , Cheongju, Chungbuk 28644, Republic of Korea.
authors.forename: Kyunglim
authors.initials: K
authors.lastname: Hyun
authors.affiliation: Department of Chemistry, Chungbuk National University , Cheongju, Chungbuk 28644, Republic of Korea.
authors.forename: Won Hee
authors.initials: WH
authors.lastname: Woo
authors.affiliation: Department of Chemistry and Institute for Molecular Science and Fusion Technology, Kangwon National University , Chuncheon, Gangwon 24341, Republic of Korea.
authors.forename: Ji Hye
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Department of Chemistry and Institute for Molecular Science and Fusion Technology, Kangwon National University , Chuncheon, Gangwon 24341, Republic of Korea.
authors.forename: Hyonseok
authors.initials: H
authors.lastname: Hwang
authors.affiliation: Department of Chemistry, Chungbuk National University , Cheongju, Chungbuk 28644, Republic of Korea.
authors.forename: Min
authors.initials: M
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Chonnam National University , Gwangju 61186, Republic of Korea.
authors.forename: Junseong
authors.identifier: http://orcid.org/0000-0002-5004-7865
authors.initials: J
authors.lastname: Lee
authors.affiliation: Department of Chemistry, Chungbuk National University , Cheongju, Chungbuk 28644, Republic of Korea.
authors.forename: Youngjo
authors.identifier: http://orcid.org/0000-0001-8571-0623
authors.initials: Y
authors.lastname: Kim
authors.affiliation: Department of Chemistry and Institute for Molecular Science and Fusion Technology, Kangwon National University , Chuncheon, Gangwon 24341, Republic of Korea.
authors.forename: Kang Mun
authors.initials: KM
authors.lastname: Lee
authors.affiliation: Department of Chemistry Education, Chungbuk National University , Cheongju, Chungbuk 28644, Republic of Korea.
authors.forename: Myung Hwan
authors.initials: MH
authors.lastname: Park