3 years ago

N-Methyl-4-pyridinium Tetrazolate Zwitterion-Based Photochromic Materials

N-Methyl-4-pyridinium Tetrazolate Zwitterion-Based Photochromic Materials
Pei-Xin Li, Guo-Cong Guo, Xiang-Yi Chen, Ming-Sheng Wang, Li-Zhen Cai, Ning-Ning Zhang
N,N′-Disubstituted bipyridinium (viologen) and N-monosubstituted bipyridinium compounds are well known for their electron-transfer (ET) photochromic behavior. Their modification has exclusively focused on the N-substituents to date. For the first time, we have studied the photochromic behavior when one pyridyl ring of the bipyridinium is substituted with a multifunctional azole group, and have found that two new coordination compounds based on N-methyl-4-pyridinium tetrazolate (mptz) zwitterion, [Zn(mptz)2Br2] (1) and [Cd3(mptz)2Cl6]n⋅4n H2O (2), exhibit typical ET photochromic behavior owing to photoinduced ET from halogen anion to the mptz ligand. This work demonstrates a new simple, neutral photoactive molecule with electron-accepting ability, which may act as a photoactive component for materials with potential photoswitching and photocatalysis applications. Shifting color: A new, unprecedented family of photochromic materials based on N-methyl-4-pyridinium tetrazolate (mptz) zwitterion was synthesized. The compounds exhibit typical electron transfer (ET) photochromic behavior owing to photoinduced electron transfer from the halogen anion to the mptz ligand.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/chem.201700677

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