Open AccessDye-based covalent organic networks
Author(s) -
Sunny K. S. Freitas,
Felipe Lopes Oliveira,
Cláudia Merlini,
Elizanne P. S. Justo,
Adriana Gioda,
Pierre M. Esteves
Publication year - 2020
Publication title -
jphys materials
Language(s) - English
Resource type - Journals
ISSN - 2515-7639
DOI - 10.1088/2515-7639/ab854b
Subject(s) - covalent bond , ion , conductivity , materials science , lamellar structure , chloride , absorption (acoustics) , ion exchange , porosity , chemistry , crystallography , chemical engineering , organic chemistry , composite material , metallurgy , engineering
This contribution presents four dye-based CONs derived from the reaction of triformylphloroglucinol with thionin acetate ( RIO-43 ), safranin chloride ( RIO-51 ), phenosafranin ( RIO-47 ), and Bismarck brown Y ( RIO-55 ). These materials, called Covalent Organic Networks (CONs), are insoluble solids formed by organic lamellar stacked structures and present permanent porosity, light absorption across the whole visible spectrum, fluorescence, ion exchange capability, and ion and electron conductivity. Periodic DFT calculations carried out indicated that the bent nature of most of those building blocks affords conductive extended materials containing pores with the shape of three-petal flowers, with the anion positioned at the petals. The turbostratic disorder makes only the center of the flower-shaped pores accessible, decreasing the specific surface areas. The material that has a higher surface area is the one derived from thionin acetate ( RIO-43 ), such as the highest electrical conductivity (1.96 × 10 –5 S cm −1 ), followed by RIO-47 ( 1.12 × 10 –7 S cm −1 ), RIO-55 (1.58 × 10 –7 S cm −1 ) and RIO-51 (3.26 × 10 –7 S cm −1 ).