Synthesis, crystal structure, luminescent properties, and magnetic properties of lanthanide(III) complexes containing the chiral (S,S/R,R)-N,N'-bis(3,5-dinitrosalicylidene)-1,2-cyclohexanediamine ligand

Soyoung Jeon, Yuri Jeong, Le Ngoc Tram Anh, Jeyun Ju, Daeheum Cho, Yoon Jung Jang, Ryuya Tokunaga, Shinya Hayami, Kil Sik Min

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

In this work, we report novel enantiopure mononuclear complexes (teaH)[Ln((S,S)-dnsalcd)2] and (teaH)[Ln((R,R)-dnsalcd)2] (Ln = Eu3+ for 1 and 4, Tb3+ for 2 and 5, and Sm3+ for 3 and 6), where teaH = triethylammonium and (S,S/R,R)-H2dnsalcd = (S,S/R,R)-N,N'-bis(3,5-dinitrosalicylidene)-1,2-cyclohexanediamine. Their unique structural features have been studied by single crystal diffraction and chiral and magnetic properties have been investigated by circular dichroism and susceptibility, respectively. Notably, 1 and 3 were found to be isomorphous and exhibited a single intramolecular π-π interaction between two (S,S)-dnsalcd2- ligands. In contrast, 2 and 5 were found to be isomorphous and displayed two intramolecular π-π interactions between two (S,S/R,R)-dnsalcd2- ligands. Interestingly, strong Eu3+/Sm3+-based emissions in the solid and solution states were observed by efficient antenna effects due to the π-π interaction modes of the coordinated ligands. Furthermore, density functional theory calculations indicated that 1 contained a single localized benzene group in the highest occupied molecular orbital (HOMO), whereas 2 exhibited full delocalization via π-π interactions in the HOMO.

Original languageEnglish
Pages (from-to)275-285
Number of pages11
JournalJournal of Industrial and Engineering Chemistry
Volume128
DOIs
StatePublished - 25 Dec 2023

Keywords

  • Chiral ligand
  • Crystal structure
  • DFT calculation
  • Lanthanide ion
  • Luminescence
  • Magnetism

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