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Figure S1 . IR spectra of dried (a) CM-dextran/YBCO composite and (b) CM-dextran control sample. The appearance of the peak at 1689 cm -1 is indicative of the presence of COOgroups in the CM-dextran chelated to metal centres (see for example J.doi:10.1039/c3ce40269j fatcat:ejnzpjfnsne4xdvxsijexixoli