| abstract |
The invention relates to a chemical compound of formula (I), wherein M1 represents an element selected from main groups II, III or IV of the periodic table of elements; x is equal to 1, 2, 3 or 4; y is equal to 2, 3 or 4, and; A represents a cation of main group V of the periodic table of elements; R1 is the same or different and represents a branched or unbranched linear or cyclic C¿1?-C40 group that contains carbon; R?2¿ is the same or different and represents a branched or unbranched linear or cyclic C¿1?-C40 group that contains carbon; R?3¿ represents a branched or unbranched linear or cyclic C¿1?-C40 group that contains carbon, and; R?4¿ represents a hydrogen atom; whereby R?2 and R3¿ are always different from one another. |