Medium viscosity effect on fluorescent properties of Sn(IV)-tetra(4-sulfonatophenyl)porphyrin complexes in buffer solutions

• Published in: Journal of molecular liquids 2019-03, Vol.277, p.1047-1053
• Main Authors: Mamardashvili, Galina M., Maltceva, Olga V., Lazovskiy, Dmitriy A., Khodov, Il'ya A., Borovkov, Victor, Mamardashvili, Nugzar Zh, Koifman, Oscar I.
• Format: Article
• Language: English
• Subjects: 2D NMR; DFT; DOSY; Fluorescent properties; Hydrogen bonding; ROESY; Sn(IV)-porphyrins; Synthesis; Viscosity
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2018.12.118

Supramolecular triads consisting of hydrophilic Sn(IV)-tetra(4-sulfophenyl)-porphyrin and two axial guests such as propylphenol, tyrosine, and 2-(2-hydroxyphenyl)-benzoxazole were synthesized. The structures of synthesized complexes were identified by experimental spectroscopic and quantum-chemical simulation methods, and their fluorescent properties were studied in various viscosity media (mixed phosphate buffer-glycerin solvents of different composition). The effect of axial ligand structure on the fluorescent properties of these triads (due to the hydrogen bonding or π-π stacking between the components of «host-guest» systems) is discussed. The potential use of synthesized complexes as environmental probes of local viscosity is proposed. [Display omitted] •Hydrophilic Sn porphyrin complexes with axial phenolic ligands were synthesized.•Fluorescence of the complexes is quenched due to the ligand-porphyrin interaction.•Complex with tyrosine can serve as a fluorescence sensor and molecular rotor.