Abstract
Excitation wavelength dependent (Ex-De) luminescent materials have attracted intense attention due to their great potential in multicolor bioimaging, dynamic anti-counterfeiting, and light emitting devices. However, it remains a formidable challenge to construct an Ex-De luminescent biomaterial with green starting materials, excellent biocompatibility, good water solubility, and multiple color emission for dynamic cell imaging. In this work, nanocomposites based on the facile self-assembly strategy of bovine serum albumin (BSA) and Au(I)-complex are rationally designed and synthesized to simultaneously present Ex-De fluorescence (429–516 nm) and decent phosphorescence (∼615 nm) in a dilute aqueous solution. Combinatory analyses of spectroscopic and microscopic results reveal that the luminescent mechanism of Au(I)-BSA nanocomposites is cluster-induced Ex-De fluorescence and metal-to-ligand charge transition (MLCT) based phosphorescence. Importantly, based on the excellent biocompatibility, water-solubility and color-tunable emission over the entire visible region (360–800 nm), the Au(I)-BSA nanocomposites are successfully used for cell imaging with multiple and switchable colors on demand. What is more, the solid tablets of Au(I)-BSA nanoparticles showed pressure-responsive luminescence and decent room temperature phosphorescence. This work provides an assembling-induced emission strategy for the design of water-soluble, non-cytotoxic, and color-tunable luminescent biomaterials based on the composite of protein and Au nanoparticles.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (22101208, 22125803, 22020102006), the Fundamental Research Funds for the Central Universities, and the Program for Professors of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning.
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Wang, X., Liu, G., Fu, K. et al. Au(I)-BSA nanocomposites with assembling-induced excitation-dependent multicolor emission for dynamic cell imaging. Sci. China Chem. 66, 174–184 (2023). https://doi.org/10.1007/s11426-022-1405-9
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DOI: https://doi.org/10.1007/s11426-022-1405-9