In this hot article 4 new metal supramolecular frameworks are described as well as their reversible crystal-to-amorphous chromotropism and crystal-to-crystal transformation accompanying the uptake of water:
Water-induced reversible structural phase transformation with chromotropism in metal supramolecular frameworks containing aminopyrazine and sulfate anions
Jaursup Boonmak, Motohiro Nakano, Narongsak Chaichit, Chaveng Pakawatchai and Sujittra Youngme, Dalton Trans., 2010, Advance Article
DOI: 10.1039/C002556A
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