Near-IR Electrochromic Film Prepared by Oxidative Electropolymerization of the Cyclometalated Pt(II) Chloride with a Triphenylamine Group.
A cyclometalated platinum chloride [(L)PtCl] {L = 4-[p-(diphenylamino)phenyl]-6-phenyl-2,2'-bipyridine} was successfully synthesized and characterized by (1)H NMR, (13)C NMR, MALDI-TOF MS, elemental analysis, and X-ray crystallography. Its oxidative electropolymerization proceeds smoothly on the working Pt and ITO electrodes by cyclic voltammetry. The film thickness can be easily tuned by controlling the CV scan number. The orange hybrid polymer film shows the nondiffusion-controlled redox processes and a unusually inverse dependence of ac impedance on its thickness. As a result of switching of the MLCT/ICT and dication absorption transitions, the adherent metallopolymer film exhibits the low-voltage-controlled anodic coloration near-IR electrochromism with significant optical contrast ratio (ΔT% = 88.8% at 820 nm), fast response time (1.9 s for the coloration step and 2.3 s for the bleaching step), and high coloration efficiency (CE = 363.3 C(-1)·cm(2)).
College of Chemistry and Pharmacy Engineering, Nanyang Normal University , Nanyang 473061, People's Republic of China.
Dongfang
D
Qiu
College of Chemistry and Pharmacy Engineering, Nanyang Normal University , Nanyang 473061, People's Republic of China.
Xiaoyu
X
Bao
College of Chemistry and Pharmacy Engineering, Nanyang Normal University , Nanyang 473061, People's Republic of China.
Qian
Q
Zhao
College of Chemistry and Pharmacy Engineering, Nanyang Normal University , Nanyang 473061, People's Republic of China.
Qichao
Q
Yang
College of Chemistry and Pharmacy Engineering, Nanyang Normal University , Nanyang 473061, People's Republic of China.
Yuquan
Y
Feng
College of Chemistry and Pharmacy Engineering, Nanyang Normal University , Nanyang 473061, People's Republic of China.
Hongwei
H
Wang
College of Chemistry and Pharmacy Engineering, Nanyang Normal University , Nanyang 473061, People's Republic of China.
Chunxia
C
Yang
College of Chemistry and Pharmacy Engineering, Nanyang Normal University , Nanyang 473061, People's Republic of China.
Kecheng
K
Liu