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- Title
20π‐Electron Antiaromatic Benziphthalocyanines with Absorption Reaching the Near‐Infrared‐II Region.
- Authors
Yanagi, Shunsuke; Takayama, Orie; Toriumi, Naoyuki; Muranaka, Atsuya; Hashizume, Daisuke; Uchiyama, Masanobu
- Abstract
Although second near‐infrared (NIR‐II, 1000–1500 nm) light has attracted considerable attention, especially for life sciences applications, the development of organic dyes with NIR‐II absorption remains a formidable challenge. Herein we report the design, synthesis, and electronic properties of 20π‐electron antiaromatic benziphthalocyanines (BPcs) that exhibit intense absorption bands in the NIR region. The strong, low‐energy absorption of the antiaromatic BPcs is attributed to electric‐dipole‐allowed HOMO‐LUMO transitions with narrow band gaps, enabled by the reduced structural symmetry of BPc compared with regular porphyrins and phthalocyanines. The combination of peripheral substituents and a central metal decreases the HOMO‐LUMO energy gaps, leading to the extension of the absorption bands into the NIR‐II region (reaching 1100 nm) under reductive conditions.
- Subjects
BAND gaps; ABSORPTION; ORGANIC dyes; METAL phthalocyanines; LIFE sciences; NEAR infrared radiation; PHTHALOCYANINES
- Publication
Chemistry - A European Journal, 2024, Vol 30, Issue 29, p1
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.202400401