The author of 《Multiple electrochemically accessible colour states in surface-confined metal-organic monolayers: stepwise embedding of individual metal centres》 were Laschuk, Nadia O.; Ahmad, Rana; Ebralidze, Iraklii I.; Poisson, Jade; Gaspari, Franco; Easton, E. Bradley; Zenkina, Olena V.. And the article was published in Materials Advances in 2021. Application In Synthesis of 4′-(4-Pyridyl)-2,2′:6′,2”-terpyridine The author mentioned the following in the article:
Sequential covalent embedding of cobalt, osmium, and iron complexes of 4′-(pyridin-4-yl)-2,2′ :6′ ,2”- terpyridine to surface-enhanced supports pre-functionalized with a templating layer results in hetero-bimetallic (Os-Fe and Co-Fe) and hetero-trimetallic (Co-Os-Fe) monolayer materials. During sequential embedding, each subsequent metal complex deposits onto unoccupied sites of the templating layer leading to densely packed functional materials. Electrochem. and XPS results show that the packing d. of Fe(II) species on the surface of the resulting materials is higher than those of pre-deposited Co(II) and Os(II) isostructural complexes. Moreover, according to Raman spectroscopy results, Fe-containing mols. experience steric hindrance when anchored to sequentially deposited Os- or Co-Os materials. The oxidation states of the metal centers in these materials can be successively electrochem. changed resulting in distinct color-to-color transitions. Importantly, monolayer materials formed on the conductive surface-enhanced indium-tin-oxide support can operate as entire working electrodes, which, in combination with a polymer gel electrolyte and an indium tin oxide/glass counter electrode, result in two-electrode electrochromic devices (ECDs). Upon operation these devices demonstrate some deterioration of the change in optical d. (ΔOD), however, this deterioration is mostly due to gel electrolyte decomposition The nature of the material allows easy replacement of the electrolyte and the counter electrode. Re-assembly of Co-Fe ECD using a new gel electrolyte and an ITO-glass counter electrode results in almost complete ΔOD recuperation. In the experiment, the researchers used 4′-(4-Pyridyl)-2,2′:6′,2”-terpyridine(cas: 112881-51-3Application In Synthesis of 4′-(4-Pyridyl)-2,2′:6′,2”-terpyridine)
4′-(4-Pyridyl)-2,2′:6′,2”-terpyridine(cas: 112881-51-3) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using its unhybridized p orbital. Application In Synthesis of 4′-(4-Pyridyl)-2,2′:6′,2”-terpyridine Pyridine has a conjugated system of six π electrons that are delocalized over the ring.