A porphyrin tripod (DP_ZnT) connected through a triazole bridge was prepared as a monomeric building block for guest-induced supramolecular polymerization. Although the lone pair electrons in triazolic nitrogen potentially bind to the zinc porphyrin units through axial ligation, the intrinsic steric hindrance suppressed the coordination of the triazole bridge to the porphyrin unit in DP_ZnT. Therefore, DP_ZnT formed spherical nanoparticles through π–π interactions. The addition of 1,3,5-tri(pyridin-4-yl)benzene (Py₃B) caused the guest-induced fibrous supramolecular polymerization of DP_ZnT by forming a 1:1 host–guest complex, which was further assembled into a fibrous polymer. Furthermore, addition of Cl^– to DP_ZnT induced the transformation of spherical nanoparticles to networked supramolecular polymers. The fibrous and networked supramolecular polymers of DP_ZnT obtained by adding Py₃B or Cl^– were depolymerized to their original spherical particles after adding Cu(ClO₄)₂ or AgNO₃, respectively.

中文翻译：

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卟啉三脚架作为客体诱导可逆超分子聚合的单体结构单元

制备了通过三唑桥连接的卟啉三脚架 ( DP _Zn T ) 作为客体诱导超分子聚合的单体结构单元。尽管三唑氮中的孤对电子可能通过轴向连接与锌卟啉单元结合，但内在的空间位阻抑制了三唑桥与DP _Zn T中卟啉单元的配位。因此，DP _Zn T通过 π-π 相互作用形成球形纳米颗粒。1,3,5-三(吡啶-4-基)苯( Py ₃ B )的加入引起DP _Zn T的客体诱导纤维状超分子聚合通过形成 1:1 的主客体复合物，进一步组装成纤维状聚合物。此外，在DP _Zn T中添加 Cl ^-可诱导球形纳米颗粒转变为网络化超分子聚合物。添加Py ₃ B或Cl ^-得到的DP _Zn T纤维状和网状超分子聚合物分别在添加Cu(ClO ₄ ) ₂或AgNO ₃后解聚成原来的球形颗粒。