Functionalization of SnO₂ crystals with a covalently-assembled porphyrin monolayer

Regulation of a Porphyrin Derivative Containing Two Symmetric Benzoic Acids by Different Pyridines

A porphyrin derivative called 5,15-di(4-carboxyphenyl)porphyrin (H₂DCPp) with carboxyl groups successfully self-assembled on a highly oriented pyrolytic graphite (HOPG) surface and its co-assembly structures with three kinds of pyridine molecules were investigated by scanning tunneling microscopy (STM) with atomic resolution. H₂DCPp arranged in a long-range ordered structure, and both 1,4-bis (pyridin-4-ylethynyl) benzene (BisPy), 4,4'-bipyridine (BP) and 1,3,5-tris(pyridin-4-ylethynyl) benzene (TPYB) molecules successfully regulated the host molecules as guest molecules. The well-organized model optimized by density functional theory (DFT) calculations reveals the detailed behavior of the assembly characteristics and regulation of porphyrin derivatives, which is helpful for the research and development of solar cells and nanodevices.

A nanostructured Fc(COCH3)2 film prepared using silica monolayer colloidal crystal templates and its electrochromic properties

Since oxidation and reduction reactions mainly take place on surfaces, enlarging the specific surface of redox materials is the key to achieving excellent electrochemical performance. In this work, by using silica monolayer colloidal crystal templates (MCCTs), a nanostructured Fc(COCH₃)₂ film is prepared successfully, and such a nanostructure could exhibit the following unique electrochemical properties: the MCCTs could impede the aggregation tendency of Fc(COCH₃)₂ and possess high electrochemical activity; Fc(COCH₃)₂ enlarges the contact area and offers more active sites and faster electronic transmission channels. The structure, optical and electrochemical properties of the nanostructured Fc(COCH₃)₂ were tested and then compared with those of compact Fc(COCH₃)₂ films to evaluate the role of the nanoarchitecture. The unique structure design of the Fc(COCH₃)₂ film enables outstanding performance, showing a large transmittance change (ΔT) of 37% at 550 nm when switched between 0.5 V and -2.5 V, which is approximately ninefold higher than that of the compact Fc(COCH₃)₂ film (approximately 4%). Response times of coloration and bleaching are found to be only 16.15 s and 5.56 s. Furthermore, the nanostructured Fc(COCH₃)₂ film shows much better cycling stability than the compact one. The results indicate that the nanostructure could significantly improve the electrochemical performance of the Fc(COCH₃)₂ film due to the increase in electrochemical active sites and the enhancement of the "D-to-A" redox switch of ferrocene.

Cooperative self-assembly of porphyrins with polymers possessing bioactive functions

This review covers recent research on design strategies for the cooperative self-assembly of porphyrins with polymers and its implementation as bioactive assembly.

Solid nanoarchitecture – Cu(ii) solution: dynamics of the chemical communication

The response of a porphyrin nanoarchitecture, covalently supported on quartz, was investigated upon the external chemical Cu(ii) stimulus. The overall structure behaves as a ternary optical system.