Shee Nirmal Kumar, Kim Min Kyoung, Kim Hee-Joon
Department of Applied Chemistry, Kumoh National Institute of Technology, Gumi 39177, Korea.
Nanomaterials (Basel). 2020 Nov 22;10(11):2314. doi: 10.3390/nano10112314.
A series of porphyrin triads (-), in which each triad is composed of a Sn(IV) porphyrin and two free-base (or Zn(II)) porphyrins, was synthesized and their self-assembled nanostructures were studied. Depending on the substituent on porphyrin moieties, each triad was self-assembled into a different nanostructure. In particular, the cooperative coordination of 3-pyridyl groups in the Sn(IV) porphyrin with the axial Zn(II) porphyrins in triad leads to forming uniform nanofibers with an average width of 10-22 nm. Other triads without the coordinating interaction between the central Sn(IV) porphyrin and the axial porphyrins formed irregularly shaped aggregates in contrast. The morphologies of nanofiber changed drastically upon the addition of pyrrolidine, in which pyrrolidine molecules break down the self-assembly process by coordinating with the axial Zn(II) porphyrins. All porphyrin aggregates exhibited efficient photocatalytic performances on the degradation of methylene blue dye under visible light irradiation. The degradation efficiencies after 2 h were observed to be between 70% and 95% for the aggregates derived from the four triads.
合成了一系列卟啉三联体（-），每个三联体由一个四价锡卟啉和两个游离碱（或二价锌）卟啉组成，并对其自组装纳米结构进行了研究。根据卟啉部分上的取代基，每个三联体自组装成不同的纳米结构。特别地，四价锡卟啉中3-吡啶基与三联体中轴向二价锌卟啉的协同配位导致形成平均宽度为10-22nm的均匀纳米纤维。相比之下，其他在中心四价锡卟啉和轴向卟啉之间没有配位相互作用的三联体形成了形状不规则的聚集体。加入吡咯烷后，纳米纤维的形态发生了剧烈变化，其中吡咯烷分子通过与轴向二价锌卟啉配位而破坏了自组装过程。所有卟啉聚集体在可见光照射下对亚甲基蓝染料的降解均表现出高效的光催化性能。观察到来自四个三联体的聚集体在2小时后的降解效率在70%至95%之间。
