Photophysics of charge transfer cocrystals composed of fluorene and its heterocyclic analogues as donors and TCNQ as an acceptor

Abstract

Charge transfer cocrystals offer an opportunity to alter the photophysical characteristics of organic chromophores. Modulation of charge transfer interactions of cocrystals to attain tunable optical properties is of great pertinence...

Photoinduced enhancement of intraligand charge-transfer of a crystalline 3,3′-diindolyl(3-pyridyl)methane

“…This is expected to be beneficial for a variety of optical properties, including photoinduced charge-transfer. 24,25 Furthermore, the process of photoexcitation may cause movement and changes in the crystalline structure of materials, leading to charge-transfer and alterations to their optical properties. The photoinduced structural dynamics causing color change have been rarely reported.…”

Synthesis and photophysical properties of charge transfer cocrystals based on TCNB and fluorene and its derivatives

“…Fluorene (FR) possesses two benzene rings, showcasing significant conjugated effects and excellent electron-donating properties, demonstrating great potential for constructing cocrystals with photoelectric properties. 31,32 Carbazole (CZ) introduces a N atom to the fluorene-based structure. 1,2,4,5-Tetracyanobenzene (TCNB), featuring a benzene ring and four electron-withdrawing cyano groups, exhibits notable electron-withdrawing capability and conjugation effects.…”

Substituent Effects in Weak Charge-Transfer Cocrystals of Benzene Derivatives with Classical TCNQ Acceptors: Experimental and Theoretical Study

“…Strong donors, such as polycyclic aromatic hydrocarbons (PAH), readily form cocrystals with strong acceptors from the TCNQ family. A good illustration of strong CT cocrystals are complexes of tetracene with TCNQ, F 2 TCNQ and F 4 TCNQ [11][12][13][14][15][16]. Two combinations, tetracene/TCNQ and tetracene/F 4 TCNQ, involve components of comparable size that form cocrystals with mixed donor-acceptor stacks via strong CT interactions.…”