Luminescent pigments and their use in security applications
AssigneeFabrica Nacional de Moneda y Timbre-Real Casa de la Moneda
InventorsGuillermo Orellana Moraleda, David García Fresnadillo, Paloma Varela García De Oteyza, Javier Gamo Aranda, José Miguel Silván Pobes, Fernando Álvarez Martínez, Andrés Ruiz Quevedo
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Abstract
The present invention relates to a new family of luminescent pigments consisting of a salt of two ruthenium(II) complex ions of opposite sign charges comprising N-chelating heterocyclic ligands and to their use in security applications to prevent counterfeiting. The invention also refers to ink compositions and to the security documents or secured goods comprising said luminescent pigments.
Claims16
A luminescent pigment consisting of a salt of two Ru(II) complex ions of opposite sign charges comprising chelating heterocyclic ligands and having formula (I):
- {y[Ru(L1)m(L2)n(L3)p]x+,w[Ru(L4)q(L5)r(L6)s]z−} (I)
- wherein
- each L1, L2, L3, L4, L5 and L6 is independently selected from the group consisting of N-coordinating monodentate, bidentate and tridentate ligands that are coordinated to the Ru atom only through N atom(s);
- x, y, w and z are independently 1, 2, 3, 4, 5, 6 or a divisor thereof, with the proviso that x·y =w·z;
- m, n, p, q, r and s are independently 0, 1, 2 or 3, so that each Ru(II) atom is hexacoordinated;
- or a solvate thereof.
Dependencies are inferred from the claim text.