Fusion is a relatively new concept to produce unique members of the porphyrin family. A representative compound formed by fusion is Nfused porphyrin, which is synthesized from N-confused porphyrin. N-Fused porphyrin has an unusually narrow HOMOLUMO energy gap and exhibits absorption in the near infrared region up to 1100 nm. Moreover, N-fused porphyrin serves as a versatile mononegative tridentate ligand, which can bind a variety of metal centers tightly. While inner-core fusion is rare in tetrapyrrolic porphyrinoids, it becomes more common in expanded porphyrins, where a variety of novel structures are produced unanticipatedly.
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