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Electrochemical functions of metallosupramolecular nanomaterials
Author(s) -
Higuchi Masayoshi,
Kurth Dirk G.
Publication year - 2007
Publication title -
the chemical record
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.61
H-Index - 78
eISSN - 1528-0691
pISSN - 1527-8999
DOI - 10.1002/tcr.20118
Subject(s) - electrochemistry , metal ions in aqueous solution , chemistry , metal , ion , nanomaterials , imine , supramolecular chemistry , conformational isomerism , nanotechnology , crystallography , combinatorial chemistry , inorganic chemistry , materials science , molecule , crystal structure , organic chemistry , electrode , catalysis
Self‐assembly of metal ions and organic ligands results in the formation of extended or discrete metallosupramolecular structures. In case of neutral ditopic ligands such as bisterpyridines, extended metallosupramolecular coordination polyelectrolytes (MEPEs) are formed. Metal ion‐induced self‐assembly of 1,4‐bis(2,2′:6′,2″‐terpyridin‐4′‐yl)benzene with Fe(II) or Co(II) results in MEPEs with interesting electrochemical properties. These MEPEs reversibly change their color when oxidized or reduced. The heterometallic MEPE consisting of Fe(II) and Co(II) combines the properties of the individual MEPEs and therefore shows their different states: red‐purple, blue, and transparent. On the other hand, complexation of cyclic phenylazomethines with metal ions results in discrete metallosupramolecular structures. We find that metal ion assembly to the organic module occurs in a stepwise fashion because of a difference in the basicity of the imine conformers, and the metal ion assembly can be controlled electrochemically. This example illustrates how metal ion binding can be controlled by the conformation of the receptor, an important step toward assembling organic ligands and metal ions in predictable ways. © 2007 The Japan Chemical Journal Forum and Wiley Periodicals, Inc. Chem Rec 7: 203–209; 2007: Published online in Wiley InterScience ( www.interscience.wiley.com ) DOI 10.1002/tcr.20118