Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 11, Issue 1, Pages 94-100Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200400584
Keywords
functional emergence; metallosupramolecular grids; self-assembly; spin transition; supra-molecular chemistry
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Hierarchical self-assembly of complex supramolecular architectures allows for the emergence of novel properties at each level of complexity. The reaction of the ligand components A and B with Fe-II cations generates the [2 x 2] grid-type functional building modules 1 and 2, presenting spin-transition properties and preorganizing an array of coordination sites that sets the stage for a second assembly step. Indeed, binding of La-III ions to 1 and of Ag-I ions to 2 leads to a 1D columnar superstructure 3 and to a wall-like 2D layer 4, respectively, with concomitant modulation of the magnetic properties of 1 and 2. Thus, to each of the two levels of structural complexity generated by the two sequential self-assembly steps corresponds the emergence of novel functional features.
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