title: Anion-controlled morphologies and spectral features of cyanine-based nanoGUMBOS--an improved photosensitizer.
abstract: 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.
authors: Department of Chemistry, Louisiana State University, Baton Rouge, LA, USA.
authors: Atiya N
authors: AN
authors: Jordan
authors: Susmita
authors: S
authors: Das
authors: Noureen
authors: N
authors: Siraj
authors: Sergio L
authors: SL
authors: de Rooy
authors: Min
authors: M
authors: Li
authors: Bilal
authors: B
authors: El-Zahab
authors: Lin
authors: L
authors: Chandler
authors: Gary A
authors: GA
authors: Baker
authors: Isiah M
authors: IM
authors: Warner
mesh_terms: D000838:Anions / Q000737:chemistry*; D002232:Carbocyanines / Q000737:chemistry*; D055664:Electrochemical Techniques; D005454:Fluorescence Polarization; D049329:Nanostructures / Q000737:chemistry*; D017319:Photosensitizing Agents / Q000737:chemistry*; D011789:Quantum Theory; D012993:Solar Energy
chemical_list: D000838:Anions; D002232:Carbocyanines; D017319:Photosensitizing Agents