Affiliation:
1. Key Laboratory of Advanced Materials Technologies International (HongKong Macao and Taiwan) Joint Laboratory on Advanced Materials Technologies College of Materials Science and Engineering Fuzhou University Fuzhou Fujian 350108 China
Abstract
AbstractConjugated polymers with strong absorption in the second near‐infrared (NIR‐II) window have multiple applications. However, the development of new type of NIR‐II conjugated polymers via facile and green methods remains challenging. Herein, this work reports a mild and convenient transition‐metal‐free method to synthesize near‐infrared absorbing quinoidal conjugated polymers containing para‐azaquinodimethane (AQM) moieties. The AQM quinoidal conjugated polymers with unique molecular structures and tunable optoelectronic properties can be synthesized by combining the Knoevenagel polycondensation of aromatic dialdehyde monomers with commercially available 1,4‐diacetyl‐2,5‐piperazinedione and the following alkylation reaction. The resultant polymer PQ‐DPP shows remarkable NIR‐II absorption with a narrow band gap of about 1.08 eV. PQ‐DPP nanoparticles exhibit high photothermal conversion efficiency of up to 48% under 1064 nm laser irradiation (1 W cm−2) endowing this polymer with potential in bio‐related applications.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Fujian Province
Subject
Materials Chemistry,Polymers and Plastics,Organic Chemistry