Near-infrared absorbing phosphorus(V)-phthalocyanines as an efficient photothermal agent
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The near-infrared (NIR) absorbing materials possess excellent light absorptivity that can be easily modified to adjust their peak absorption wavelength (λmax). But, materials exhibiting high efficiency in the second near infrared (NIR-II) region are relatively limited. Phthalocyanines (Pcs) are a promising class of organic photothermal materials due to their extended aromatic structure and abundant delocalized π-electrons, possessing a strong Q-band absorption in the NIR region. The absorption of Pcs can be further tuned to the NIR region by extending π- conjugation and introducing substitutions in the central metals and functional groups. This poster details the synthesis of phosphorus(V) phthalocyanines (P-Pcs) and their application as a photothermal agent. Photo-induced thermochromic films are produced by incorporating P-Pcs and thermochromic dyes in a polymer matrix. The prepared film's heat generation and resulting color changes are monitored upon the illumination of a NIR laser.