National Institute for Materials Science

Manas Kumar Bera

Masayoshi Higuchi

The present invention addresses a first problem of providing a polymer that has electrochromic characteristics, and that can form a sheet which seems more transparent when applied to an electrochromic element and is decolored. The present invention for solving the problem is a polymer obtained by forming a complex between, and binding together, compound A represented by formula 1: BP1-L1-BP2 and at least one specific metal ion selected from the group consisting of first metal ions having a coordination number of 4, second metal ions having a coordination number of 6, and third metal ions having a coordination number of 4 and 6. In the formula, L1 represents a single bond or a divalent group, and BP1 and BP2 may be identical or different from each other and each independently represent a bipyridine derivative.

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Tsukuba, Japan

Manas Kumar Bera