Two Thermochromic Layered Iodoargentate Hybrids Directed by 4- and 3‑Cyanopyridinium Cations

Two layered iodoargentates, [HCP][Ag2I3] (HCP+ = NH-4-cyanopyridinium) (1) and [MCP][Ag4I5] (MCP+ = N-methyl-3-cyanopyridinium) (2) have been solvothermally synthesized. For 1, the inorganic layer is built up by 4-connected Ag4I8 unit with cubane-type Ag4I4 core via sharing peripheral μ2-I in ab pla...

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Bibliographic Details
Published in:Crystal growth & design 2014-08, Vol.14 (8), p.3875-3879
Main Authors: Yu, Tanlai, An, Li, Zhang, Lin, Shen, Junju, Fu, Yangbo, Fu, Yunlong
Format: Article
Language:English
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Summary:Two layered iodoargentates, [HCP][Ag2I3] (HCP+ = NH-4-cyanopyridinium) (1) and [MCP][Ag4I5] (MCP+ = N-methyl-3-cyanopyridinium) (2) have been solvothermally synthesized. For 1, the inorganic layer is built up by 4-connected Ag4I8 unit with cubane-type Ag4I4 core via sharing peripheral μ2-I in ab plane, while the HCP+ cations are located at the apertures and interlayer space. For 2, the inorganic layer is constructed from [Ag6I6] n and [AgI3] n 2n– chains via alternative corner- and edge-sharing modes along the b-axis, while the MCP+ cations lie between neighboring layers. Compounds 1 and 2 exhibit reducing band gaps relative to the bulk β-AgI and remarkable thermochromism, which are ascribed to the intermolecular charge transfer (CT) and affected by electron affinity of pyridinium cations.
ISSN:1528-7483
1528-7505
DOI:10.1021/cg500445b