Dipartimento di Scienze Chimiche, Università degli Studi di Catania, Viale A. Doria 6, 95125 Catania, Italy.
Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università degli Studi di Messina, Viale F. Stagno d'Alcontres, 31, 98166 Messina, Italy.
Molecules. 2021 Jan 29;26(3):704. doi: 10.3390/molecules26030704.
The pivotal role played by potassium ions in the noncovalent synthesis of discrete porphyrin-calixarene nanostructures has been examined. The conformation adopted by the two cavities of octa-cationic calix[4]tube was found to prevent the formation of complexes with well-defined stoichiometry between this novel water-soluble calixarene and the tetra-anionic phenylsulfonate porphyrin . Conversely, preorganization of into a -symmetrical scaffold, triggered by potassium ion encapsulation (@K), allowed us to carry out an efficient hierarchical self-assembly process leading to 2D and 3D nanostructures. The stepwise formation of discrete @K noncovalent assemblies, containing up to 33 molecular elements, was conveniently monitored by UV/vis spectroscopy by following the absorbance of the porphyrin Soret band.
钾离子在离散卟啉-杯芳烃纳米结构的非共价合成中起着关键作用，这一点已经得到了检验。研究发现，八阳离子杯[4]管的两个空腔的构象阻止了这种新型水溶性杯芳烃与四阴离子苯磺酸盐卟啉之间形成具有明确化学计量比的配合物。相反，通过钾离子包封（@K）引发 到对称支架的预组织，使我们能够进行有效的分层自组装过程，从而得到 2D 和 3D 纳米结构。通过跟踪卟啉 Soret 带的吸光度，通过紫外/可见光谱方便地监测离散 @K 非共价组装体的逐步形成，其中包含多达 33 个分子元件。
