2020 journal article

Bioconjugatable synthetic chlorins rendered water-soluble with three PEG-12 groups via click chemistry

JOURNAL OF PORPHYRINS AND PHTHALOCYANINES, 24(1-3), 362–378.

By: N. Matsumoto n, M. Taniguchi n  & J. Lindsey n 

co-author countries: United States of America πŸ‡ΊπŸ‡Έ
author keywords: chlorophyll; fluorescence; fluorophore; bright; diagnostics; aqueous
Source: Web Of Science
Added: March 16, 2020

Chlorins provide many ideal features for use as red-region fluorophores but require molecular tailoring for solubilization in aqueous solution. A chlorin building-block bearing 18,18-dimethyl, 15-bromo and 10-[2,4,6-tris(propargyloxy)phenyl] substituents has been transformed via click chemistry with CH 3 (OCH 2 CH[Formula: see text]-N 3 followed by Suzuki coupling with 3-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)propanoic acid, thereby installing a water-solubilization motif and a bioconjugatable handle, respectively. In toluene, [Formula: see text]-dimethylformamide (DMF) or water, the resulting facially encumbered free base chlorin exhibits characteristic chlorin absorption ([Formula: see text] [Formula: see text]412, 643 nm) and fluorescence ([Formula: see text] [Formula: see text]645 nm) spectra with only modest variation in fluorescence quantum yield ([Formula: see text] values (0.24, 0.25 and 0.19, respectively). The zinc chlorin derived therefrom exhibits similar spectral constancy ([Formula: see text] [Formula: see text]414 and 613 nm, [Formula: see text] [Formula: see text]616 nm) and [Formula: see text] 0.094, 0.10 and 0.086 in the three solvents. The results together indicate the viability of the molecular design and synthetic methodology to create red-region fluorophores for use in diverse applications.