Premium
Near‐Infrared Electrochromism of Multilayer Films of an N C N‐Pincer Tri‐Ruthenium(II) Complex
Author(s) -
Li ZhiJuan,
Tang JianHong,
Shao JiangYang,
Zhong YuWu
Publication year - 2020
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202000400
Subject(s) - electrochromism , chemistry , ruthenium , chronoamperometry , nanocrystalline material , pincer movement , iridium , monolayer , crystallography , cyclic voltammetry , electrochemistry , organic chemistry , electrode , catalysis , biochemistry
A star‐shaped N C N‐pincer tri‐Ru II complex 3 with a triarylamine core, capped with three 2,2':6',2''‐terpyridine‐4,4',4''‐tricarboxylic acid terminal ligands, has been synthesized. The single‐crystal X‐ray structure of a precursor ester complex 7 is presented. By using the Zr‐mediated layer‐by‐layer assembly, multilayer films FTO/SnO 2 :Sb/( 3 ) n (Zr) n ‐1 ( n = 1–4) have been prepared on Sb‐doped SnO 2 nanocrystalline substrates. These films have been characterized by XPS and SEM analysis. The electrochromism of these films in the near‐infrared region were examined by oxidative spectroelectrochemical measurements and douple‐potential‐step chronoamperometry. The two‐layered film displays the best overall performance with a contrast ratio (Δ T %) of 36 % at 1550 nm and response time of shorter than 2 s. After 1000 switching cycles, around 11 % loss of the contrast ratio is observed, suggesting good cyclic stability of these films. In addition, a comparison of the electrochromic performance of these multilayer films with respect to the previously reported electropolymerized films of a related tri‐Ru II complex and monolayer films of two mono‐Ru II complexes on SnO 2 :Sb is presented.