Heptazine is known as a substructure of the graphitic carbon nitride (g-C₃N₄).^1,2) Graphitic carbon nitride is expected to be applied to various applications including photocatalysts and sensors due to its optical and semiconductor properties. In particular, its application as metal-free and visible light driven photocatalysts has attracted much attention, and the improvement of catalytic activity by metal doping or combination with other semiconductor materials has been investigated.³⁾ Porous photocatalysts such as covalent organic frameworks (COFs) composed of the heptazine structure have also been developed.⁴⁾

Furthermore, thermally activated delayed fluorescence (TADF) materials containing the heptazine structure as an electron acceptor group have also been developed,⁵⁾ and a TADF material with a negative singlet-triplet energy gap (ΔE_ST) by inverted singlet and triplet energy levels was reported recently.⁶⁾

We offer melem (Product No. M3538) and heptazine chloride (Product No. T4145), which are useful for researches on graphitic carbon nitride or photocatalysts and light-emitting materials with heptazine structures.

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• Nanocarbon Materials
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References

1. 1) A critical review on graphitic carbon nitride (g-C₃N₄)-based materials: Preparation, modification and environmental application
   • J. Wang , S. Wang, Coord. Chem. Rev. 2022, 453, 214338.
2. 2) A Tour-Guide through Carbon Nitride-Land: Structure- and Dimensionality-Dependent Properties for Photo(Electro)Chemical Energy Conversion and Storage
   • V. W. Lau, B. V. Lotsch, Adv. Energy Mater. 2022, 12, 2101078.
3. 3) Graphitic Carbon Nitride (g-C₃N₄)-Based Photocatalysts for Artificial Photosynthesis and Environmental Remediation: Are We a Step Closer To Achieving Sustainability?
   • W.-J. Ong, L.-L. Tan, Y. H. Ng, S.-T. Yong, S.-P. Chai, Chem. Rev. 2016, 116, 7159.
4. 4) Covalent Organic Frameworks Containing Dual O₂ Reduction Centers for Overall Photosynthetic Hydrogen Peroxide Production
   • D. Chen, W. Chen, Y. Wu, L. Wang, X. Wu, H. Xu, L. Chen, Angew. Chem. Int. Ed. 2023, 62, e202217479.
5. 5) Highly Efficient Organic Light-Emitting Diode Based on a Hidden Thermally Activated Delayed Fluorescence Channel in a Heptazine Derivative
   • J. Li, T. Nakagawa, J. MacDonald, Q. Zhang, H. Nomura, H. Miyazaki, C. Adachi, Adv. Mater. 2013, 25, 3319.
6. 6) Delayed fluorescence from inverted singlet and triplet excited states
   • N. Aizawa, Y.-J. Pu, Y. Harabuchi, A. Nihonyanagi, R. Ibuka, H. Inuzuka, B. Dhara, Y. Koyama, K. Nakayama, S. Maeda, F. Araoka, D. Miyajima, Nature 2022, 609, 502.

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