Abstract
With the aim to investigate the influence of halogens on electronic structures and fluorescence properties, a new Salen type hetero-halogenated lanthanide complex [CeIV((±)3Br5Cl-salmen)2] (Ce-χ-L) was synthesized, and a set of optical properties were investigated. The complex was characterized by FT-IR, elemental analysis, UV and single-crystal X-ray diffraction, and structural analysis revealed that halogen atoms plays a significant role in inducing the complex into a special intramolecular ‘X’ structure as well as supramolecular dimer assemblies. Theoretical calculations revealed that the introduction of halogen atoms is important for lowering the energy level of HOMO-LUMO the lanthanide complexes Schiff base complexes and also increase pathways of intermolecular interactions. pH stability test revealed the supramolecular assemblies of Ce-χ-L is sensitive to the variation of pH environment, and the accompanied assemble and disassemble behaviors are closely related to the substitution of halogen atoms.
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