Compound comprising the structural element: wherein W is selected from: - a P III (G 2) (G 3) group: wherein the links G 2 -G 3 comprises the following structural element: wherein R 1, R 2, R 3, R 4, R 5, R 6, R 7 are selected from: hydrogen, substituted or unsubstituted, linear or branched, aliphatic or aromatic hydrocarbon group; F, Cl, Br, I, -OR 8, -C R 9, -CO 2 R 10, -CO 2 M 1, -SR 11, -SOR 12, -SO 2 R 13, -SO 3 R 14, -SO 3 M 2, -NR 15 R 16; wherein R 8, R 9, R 10, R 11, R 12, R 13, R 14, R 15, R 16 are selected from: hydrogen, substituted or unsubstituted, linear or branched, aliphatic or aromatic or heteroaromatic or fused aromatic or fused aromatic-heteroaromatic hydrocarbon group; -OR17; wherein R 17 is selected from: hydrogen, unsubstituted or substituted, linear or branched, aliphatic or aromatic hydrocarbon group; wherein two or more of R 1 to R 17 may be linked to each other covalently; wherein M 1 and M 2 are selected from: alkali metal, alkaline earth metal, ammonium, phosphonium, and wherein the meaning may have been chosen for M 1 and M 2 independently of each other, with R 69, R 70, R 71, R 72, R 73, R 74, R 75, R 76 = hydrogen; linear or branched, aliphatic or aromatic or heteroaromatic or fused aromatic or fused aromatic-heteroaromatic hydrocarbon group with any desired further substitution; F, Cl, Br, or I; or -OR 77, -COR 78, -CO 2 R 79 -CO 2 M 1, -SR 80, -SOR 81, -SO 2 R 82, -SO 3 R 83, -SO 3 M 2, -NR 84 R 85, or N=CR 86 R 87; wherein the meaning may have been chosen for each R 69 to R 76 independently of each other and wherein two or more of R 69 to R 76 may be linked to each other covalently; wherein R 77, R 78, R 79, R 80, R 81, R 82, R 83, R 84, R 85 are selected from: hydrogen, substituted or unsubstituted, linear or branched, aliphatic or aromatic hydrocarbon group; -OR 86; wherein R 86 is selected from: hydrogen, substituted or unsubstituted, linear or branched, aliphatic or aromatic hydrocarbon group; wherein M 1 and M 2 are selected from: alkali metal, alkaline earth metal, ammonium, phosphonium, and wherein the meaning may have been chosen for M 1 and M 2 independently of each other. wherein R 1, R 2, R 3, R 4, R 5, R 6, R 7 are selected from: hydrogen, substituted or unsubstituted, linear or branched, aliphatic or aromatic hydrocarbon group; F, Cl, Br, I, -OR 8, -C R 9, -CO 2 R 10, -CO 2 M 1, -SR 11, -SOR 12, -SO 2 R 13, -SO 3 R 14, -SO 3 M 2, -NR 15 R 16; wherein R 8, R 9, R 10, R 11, R 12, R 13, R 14, R 15, R 16 are selected from: hydrogen, substituted or unsubstituted, linear or branched, aliphatic or aromatic or heteroaromatic or fused aromatic or fused aromatic-heteroaromatic hydrocarbon group; -OR17; wherein R 17 is selected from: hydrogen, unsubstituted or substituted, linear or branched, aliphatic or aromatic hydrocarbon group; wherein two or more of R 1 to R 17 may be linked to each other covalently; wherein M 1 and M 2 are selected from: alkali metal, alkaline earth metal, ammonium, phosphonium, and wherein the meaning may have been chosen for M 1 and M 2 independently of each other, with R 69, R 70, R 71, R 72, R 73, R 74, R 75, R 76 = hydrogen; linear or branched, aliphatic or aromatic or heteroaromatic or fused aromatic or fused aromatic-heteroaromatic hydrocarbon group with any desired further substitution; F, Cl, Br, or I; or -OR 77, -COR 78, -CO 2 R 79 -CO 2 M 1, -SR 80, -SOR 81, -SO 2 R 82, -SO 3 R 83, -SO 3 M 2, -NR 84 R 85, or N=CR 86 R 87; wherein the meaning may have been chosen for each R 69 to R 76 independently of each other and wherein two or more of R 69 to R 76 may be linked to each other covalently; wherein R 77, R 78, R 79, R 80, R 81, R 82, R 83, R 84, R 85 are selected from: hydrogen, substituted or unsubstituted, linear or branched, aliphatic or aromatic hydrocarbon group; -OR 86; wherein R 86 is selected from: hydrogen, substituted or unsubstituted, linear or branched, aliphatic or aromatic hydrocarbon group; wherein M 1 and M 2 are selected from: alkali metal, alkaline earth metal, ammonium, phosphonium, and wherein the meaning may have been chosen for M 1 and M 2 independently of each other.