Superparamagnetic microparticles, which are covered with moisture-sensitive luminescent compounds,

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Superparamagnetic microparticles, nanoparticles with a siliceous matrix with embedded therein on at least a portion of the surface of this reversible magnetic properties and at least one moisture-sensitive luminescent particles have coordination compound, selected from monomers, oligomers or polymers having at least one three-dimensional coordination compounds or two - cationic coordination center of m, wherein m is selected the metal atoms of the rare-earth elements having the atomic numbers 57 to 71, scandia, yttria, manganese, iron, zinc, titanium, of magnesium, of calcium, of strontium, of barium, aluminum, of gallium, indium and a bismuth, wherein the coordination sphere of the coordination center m is at least in part by electron-rich centers of one or more anionic and/or neutral ligands L is saturated, wherein at least one of said electron-rich centers with a free electron pair or other electron donor structure on the binding for coordination center meters is involved.