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Electrochromic Os(II)‐Based Metallo‐Supramolecular Polymers
Author(s) -
Bera Manas Kumar,
Chakraborty Chanchal,
Rana Utpal,
Higuchi Masayoshi
Publication year - 2018
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201800415
Subject(s) - electrochromism , materials science , electrochromic devices , branching (polymer chemistry) , supramolecular polymers , supramolecular chemistry , polymer , transmittance , redox , substrate (aquarium) , polymer chemistry , nanotechnology , optoelectronics , chemistry , electrode , crystallography , crystal structure , composite material , oceanography , metallurgy , geology
This work presents the preparation of a series of novel Os(II)‐based metallo‐supramolecular polymers (polyOss: linear polyOsL1 100% and hyperbranched polyOsL1 x% L2 y% ) that show a broad absorption spanning 312 to 677 nm and a low Os(II)/(III) redox potential of 0.94 V. The electrochromic properties of a polyOs film cast on an ITO substrate is investigated. The change in transmittance (Δ T ) of polyOsL1 100% is 49.9%, and the switching times for coloration ( t c ) and bleaching ( t b ) are 0.70 and 0.82 s, respectively. The introduction of a 10% branching structure (polyOsL1 90% L2 10% ) further enhanced the electrochromic performance with Δ T = 59.4%, t c = 0.41 s, and t b = 0.54 s. The coloration efficiency (η) increased from 396.1 to 467.5 cm 2 C −1 upon branching. A solid‐state electrochromic device with polyOsL1 100% is successfully fabricated to use the polymer for potential applications.
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