A method for the manufacture of particulate non-covalent compounds in the form of metallic nanoparticle dispersions, consisting of at least one amphiphilic, partially modified dendritic polymeric material based on polyester, polyether, polyglycerin, polyglycerol, polyol, polyether or polyamide or combinations thereof and with a degree of branching of between 50% and 100% as well as a molecular weight of 5000 to 50000 g/mole, wherein the modification of the accessible reactive end groups is carried out to a degree with respect to the nominal total number of end groups of the dendritic polymeric material which is between 30% ≤ X ≤ 90% with aliphatic, branched or aromatic residues with a chain length of between 6 and 24 carbon atoms, and of metallic nanoparticles embedded inter- and intra-molecularly in the dendritic polymeric material, which nanoparticles, based on divalent and higher valency metal ions, exhibit a defined size with a bimodal size distribution, wherein: - a solution of an amphiphilic modified dendritic polymer is produced in a suitable medium A with a boiling point 1, - this solution is supplemented with a metallic precursor compound in the form of a metallic salt in a molar ratio of functional groups of the dendritic polymer backbone to metal ions (Me y+) in the range 64:1 to 2:1, - next, it is mixed with a solution B, which has a boiling point 2 that is substantially higher than boiling point 1 of medium A, of a reducing agent that is of sufficient strength to reduce the metal ions, in a molar ratio to the metal ions (Me y+) of 10:1 to 1:1, with stirring at ambient temperature and under semi-inert conditions, and - the homogenized mixture of the solutions A and B is heated in a microwave oven, with simultaneous stirring while flushing with an inert gas, to the boiling point 1 and then heated further until medium A has been evaporated off and reduction is complete, and the product dispersion of the dendritic polymeric material and the embedded metallic nanoparticles produced in this manner is cooled under an atmosphere of nitrogen or an inert gas until appropriate further processing is carried out. - a solution of an amphiphilic modified dendritic polymer is produced in a suitable medium A with a boiling point 1, - this solution is supplemented with a metallic precursor compound in the form of a metallic salt in a molar ratio of functional groups of the dendritic polymer backbone to metal ions (Me y+) in the range 64:1 to 2:1, - next, it is mixed with a solution B, which has a boiling point 2 that is substantially higher than boiling point 1 of medium A, of a reducing agent that is of sufficient strength to reduce the metal ions, in a molar ratio to the metal ions (Me y+) of 10:1 to 1:1, with stirring at ambient temperature and under semi-inert conditions, and - the homogenized mixture of the solutions A and B is heated in a microwave oven, with simultaneous stirring while flushing with an inert gas, to the boiling point 1 and then heated further until medium A has been evaporated off and reduction is complete, and the product dispersion of the dendritic polymeric material and the embedded metallic nanoparticles produced in this manner is cooled under an atmosphere of nitrogen or an inert gas until appropriate further processing is carried out.