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The same complex was also anchored to the unmodified activated carbon and to the acyl chloride functionalised carbon prepared in (ii). The resulting carbon\u2010based materials were characterised by elemental analysis, surface techniques (SEM and XPS), temperature programmed desorption, and nitrogen adsorption at 77\u00a0K and EPR spectroscopy for the materials with copper(<jats:sc>II<\/jats:sc>) complexes. Data from all techniques provided evidence for (i)\u00a0the covalent binding of <jats:italic>trien<\/jats:italic> to acyl chloride functionalities; and (ii)\u00a0the irreversible attachment of [Cu(acac)<jats:sub>2<\/jats:sub>] to all carbon\u2010based materials. Data for the materials with copper(<jats:sc>II<\/jats:sc>) proved conclusively that only the immobilisation procedure based on Schiff condensation with <jats:italic>trien<\/jats:italic> led to copper(<jats:sc>II<\/jats:sc>) complexes in which the metal centre remains four\u2010coordinate. 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