A material comprising a polymer matrix functionalized with: - an organic compound comprising a moiety of formula wherein G is: - oxygen; - sulfur; - NR a, N (+) R a R b with R a and R b are each independently H, C 1 -C 18 alkyl, aryl or heteroaryl; - CH- C- 2 or (EWG 1)-C-(EWG 2) with EWG, EWG 1, EWG 2 being an electron withdrawing group (such as nitrile (-C=N); ketone (C=O)-R c; (ester (-(C=O)-OR c) with R c selected from H, C 1 -C 18 alkyl, aryl and heteroaryl; aryl or heteroaryl (such as pyridinyl and pyrimidinyl)); - preferably oxygen; - and a metal cluster compound comprising a moiety of formula [M 6 Q i 8 L a 6] d- wherein: - M represents molybdenum (Mo), tungsten, rhenium (Re), or a mixture thereof, preferably Mo or W; - Q' is an inner ligand and represents a halogen or a chalcogen atom, preferably a halogen atom, or a mixture thereof; and - L a is an apical ligand and represents a halogen atom, an organic ligand or a mixture thereof - d ranges from -4 to + 4, preferably 2 to 4, more preferably 2. wherein said organic compound and metal cluster compound are independently: Linked to the polymer matrix by - Covalent bond - Electrostatic interaction - Supramolecular interaction - Complexation / adsorption and/ or dispersed within the polymer matrix (admixture/ embedded). - an organic compound comprising a moiety of formula wherein G is: - oxygen; - sulfur; - NR a, N (+) R a R b with R a and R b are each independently H, C 1 -C 18 alkyl, aryl or heteroaryl; - CH- C- 2 or (EWG 1)-C-(EWG 2) with EWG, EWG 1, EWG 2 being an electron withdrawing group (such as nitrile (-C=N); ketone (C=O)-R c; (ester (-(C=O)-OR c) with R c selected from H, C 1 -C 18 alkyl, aryl and heteroaryl; aryl or heteroaryl (such as pyridinyl and pyrimidinyl)); - preferably oxygen; - oxygen; - sulfur; - NR a, N (+) R a R b with R a and R b are each independently H, C 1 -C 18 alkyl, aryl or heteroaryl; - CH- C- 2 or (EWG 1)-C-(EWG 2) with EWG, EWG 1, EWG 2 being an electron withdrawing group (such as nitrile (-C=N); ketone (C=O)-R c; (ester (-(C=O)-OR c) with R c selected from H, C 1 -C 18 alkyl, aryl and heteroaryl; aryl or heteroaryl (such as pyridinyl and pyrimidinyl)); - preferably oxygen; - and a metal cluster compound comprising a moiety of formula [M 6 Q i 8 L a 6] d- wherein: - M represents molybdenum (Mo), tungsten, rhenium (Re), or a mixture thereof, preferably Mo or W; - Q' is an inner ligand and represents a halogen or a chalcogen atom, preferably a halogen atom, or a mixture thereof; and - L a is an apical ligand and represents a halogen atom, an organic ligand or a mixture thereof - d ranges from -4 to + 4, preferably 2 to 4, more preferably 2. - M represents molybdenum (Mo), tungsten, rhenium (Re), or a mixture thereof, preferably Mo or W; - Q' is an inner ligand and represents a halogen or a chalcogen atom, preferably a halogen atom, or a mixture thereof; and - L a is an apical ligand and represents a halogen atom, an organic ligand or a mixture thereof - d ranges from -4 to + 4, preferably 2 to 4, more preferably 2. Linked to the polymer matrix by - Covalent bond - Electrostatic interaction - Supramolecular interaction - Complexation / adsorption and/ or - Covalent bond - Electrostatic interaction - Supramolecular interaction - Complexation / adsorption dispersed within the polymer matrix (admixture/ embedded).