Four novel coordination compounds based on N-acetyl-L-phenylalanine: Synthesis, characterization and fluorescence properties

• Published in: Journal of molecular structure Vol. 1295; p. 136753
• Main Authors: Deng, Kaimeng, Jiang, Guoyuan, Cao, Mengru, Deng, Qianying, Song, Huihua
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.01.2024
• Subjects: Crystal structures; Fluorescent recognition; N-acetyl-L-phenylalanine; Crystal structures; N-acetyl-L-phenylalanine; Fluorescent recognition
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2023.136753

•Four novel chiral coordination compounds based on N-acetyl-l-phenylalanine ligand were constructed by a mixed ligand strategy.•The structures of compounds 1–3 with cadmium(Ⅱ) as the center metal ion changes from 0D, 1D to 2D.•Compounds 3 and 4 can highly selectively detect Fe3+ and nitrobenzene in aqueous solutions. Four novel d10 transition metal chiral coordination compounds Cd(L-acphe)2(H2O)2 (1), {[Cd(L-acphe)2(bpe)(H2O)]·2·5H2O}n (2), {[Cd(L-acphe)2 (4,4′-bipy)(H2O)]·H2O}n (3), {[Zn2(L-acphe)2(bpp)2(OH)]NO3·2H2O}n (4) (L-Hacphe = N-acetyl-l-phenylalanine, 4,4′-bipy = 4,4′-bipyridine, bpe = 1,2-bis (4-pyridyl)ethane, bpp = 1,3-bis(4-pyridyl)propane) have been synthesized by changing central metal ions and N-containing auxiliary ligands. Their structures were determined by single crystal X-ray diffraction analysis and characterized by elemental analysis, infrared spectroscopy, thermogravimetric analysis, powder X-ray diffraction and circular dichroism. The structures of compounds 1–3 with cadmium(Ⅱ) as the center metal ion change from 0D, 1D to 2D, ultimately compound 1 generates a 2D supramolecular structure via hydrogen bonding, while compounds 2 and 3 expand to 3D supramolecular structures through hydrogen bonding. The compound 4 with zinc(Ⅱ) as the center metal ion feature 1D chain structures, and 3D supramolecular structure of compound 4 is formed by hydrogen bonding. The present results indicate that selecting central metals with different electronic structures and introducing different N-containing auxiliary ligands could achieve the regulation of the structures of compounds. In addition, the fluorescence recognition properties of compounds 3 and 4 demonstrate that they can highly selectively detect Fe3+ and nitrobenzene in aqueous solutions through fluorescence quenching, indicating that compounds 3 and 4 are expected to become bifunctional fluorescence recognition sensors for the detection of Fe3+ ions and nitrobenzene.