Anion-controlled morphologies and spectral features of cyanine-based nanoGUMBOS - An improved photosensitizer
The ability to control the morphologies and spectral properties of organic low-dimensional nanomaterials is of paramount importance. The research reported herein demonstrates a template-free approach to tailored morphological and optical properties for a novel class of pseudoisocyanine (PIC)-based fluorescent organic nanoparticles derived from a group of uniform materials based on organic salts (GUMBOS). The synthesized nanoscale PIC-based particles (termed nanoGUMBOS), [PIC][NTf 2] and [PIC][BETI], exhibit interesting adaptability as a function of the associated anion. The diamond-shaped nanostructures of [PIC][NTf 2] and [PIC][BETI] nanorods exhibit enhanced fluorescence quantum yields relative to the parent compound, [PIC][I]. As supported by fluorescence lifetime measurements, these enhanced spectral properties can be attributed to differences in molecular self-assembly ordering (e.g., H- vs. J-aggregation) and restricted molecular rotation leading to reduced twisted intramolecular charge transfer in the nanoGUMBOS. The electrochemical properties of the PIC-based GUMBOS suggest their potential use in dye-sensitized solar cells. © 2012 The Royal Society of Chemistry.
Publication Source (Journal or Book title)
Jordan, A., Das, S., Siraj, N., De Rooy, S., Li, M., El-Zahab, B., Chandler, L., Baker, G., & Warner, I. (2012). Anion-controlled morphologies and spectral features of cyanine-based nanoGUMBOS - An improved photosensitizer. Nanoscale, 4 (16), 5031-5038. https://doi.org/10.1039/c2nr30432e