| 主权项 |
1. An oxo-nitrogenated complex of lanthanides having general formula (I) or (II): wherein: Ln is neodymium (Nd), lanthanum (La), praseodymium (Pr), gadolinium (Gd), europium (Eu), terbium (Tb), samarium (Sm), or erbium (Er); R1 and R2, equal to or different from each other, represent a hydrogen atom; or they are selected from linear or branched C1-C20 alkyl groups, cycloalkyl groups optionally substituted, or aryl groups optionally substituted; R3 represents a hydrogen atom; or it is selected from linear or branched C1-C20 alkyl groups, cycloalkyl groups optionally substituted, or aryl groups optionally substituted; or R3 represents a ketoimine group having the formula: wherein R′ and R″, equal to or different from each other, represent a hydrogen atom, or they are selected from linear or branched C1-C20 alkyl groups, cycloalkyl groups optionally substituted, or aryl groups optionally substituted; Y represents an oxygen atom; or a —N—R4 group wherein R4 represents a hydrogen atom, or it is selected from linear or branched C1-C20 alkyl groups, or cycloalkyl groups optionally substituted; or, when Y represents a —N—R4 group, R2 and R4 can be optionally bound to each other so to form, together with the other atoms to which they are bound, a saturated, unsaturated or aromatic cycle containing from 3 to 6 carbon atoms, optionally substituted with linear or branched C1-C20 alkyl groups, said cycle optionally containing other heteroatoms; and X1, X2 and X3, equal to or different from each other, represent a halogen atom; or they are selected from linear or branched C1-C20 alkyl groups, —OCOR5 or —OR5 groups wherein R5 is selected from linear or branched C1-C20 alkyl groups. |
