Through fusing isoindigo (IID) units at 6,7;6′,7′‐positions, a series of new near‐infrared (NIR) absorbing and stable ribbon‐like conjugated molecules, namely nIIDs in which n represents the number of IID units, have been synthesized. The optical band gaps of the molecules are lowered from 2.03 eV of 1IID to 1.12 eV of 6IID with the increase of the conjugation length. 3IID, 4IID, and 6IID have strong absorption in the NIR region and exhibit photothermal conversion efficiencies of greater than 50 % under laser irradiation at λ=808 nm.

中文翻译：

---

吸收波段达到近红外的熔融等靛蓝色带

通过在6,7; 6'，7'-位置融合等靛蓝（IID）单元，一系列新的吸收近红外（NIR）且稳定的带状共轭分子，即nIID，其中n代表IID单元的数量，已经合成。随着共轭长度的增加，分子的光学带隙从1IID的2.03 eV降低到6IID的1.12 eV。3IID，4IID和6IID在NIR区域具有很强的吸收能力，并且在λ = 808 nm的激光照射下，其光热转换效率大于50％。