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Sterically Protected N2O-Type Benzopyrromethene Boron Complexes from Boronic Acids with Intense Red/Near-Infrared
Na Chen1, Wenjie Zhang1, Shun Chen1
1Laboratory of Functional Molecular Solids, Ministry of Education; School of Chemistry and Materials Science and ‡School of Life Science, Anhui Normal University , Wuhu 241000, China.
Abstract:
A series of N2O-type benzopyrromethene boron complexes have been synthesized from the condensation of pyrrole, formylisoindole, and various boronic acids. These dyes have red/near-infrared absorption, high solution- and solid-state fluorescence, as well as good solubility in a variety of solvents due to the presence of axial-substituted groups that provide steric protection and prevent their possible aggregations. Two water-soluble derivatives with pyridinium ions were developed as near-infrared excitable mitochondrially localizing fluorescent probes.