Metal complexes of iminohydroxamic acids

A complex of the formula Ia or Ib,

• 28
• where the variables are defined as follows:
• Nu is selected from among O, S, N—R4, P—R4,
• M is selected from among Ti, Zr, Hf, V, Nb, Ta, Cr, Ni, Pd;
• h is an integer from 0 to 4;
• y corresponds to the oxidation state of M minus 1;
• z corresponds to the oxidation state of M minus 2;
• X are identical or different and are selected from among halogen, C1-C6-alkoxy, acetylacetonate, N(R5R6 ), C1-C8-alkyl, C3-C12-cycloalkyl, C7-C13-aralkyl and C6-C14-aryl,
• R1, R4 are identical or different and are selected from among hydrogen,
• C1-C18-alkyl, substituted or unsubstituted,
• C2-C18-alkenyl, substituted or unsubstituted, having from 1 to 4 isolated or conjugated double bonds;
• C3-C12-cycloalkyl, substituted or unsubstituted,
• C7-C13-aralkyl,
• C6-C14-aryl, unsubstituted or substituted by one or more identical or different substituents selected from among
• C1-C18-alkyl, substituted or unsubstituted,
• C2-C18-alkenyl, substituted or unsubstituted,
• C3-C12-cycloalkyl,
• C7-C13-aralkyl,
• C6-C14-aryl,
• halogen,
• C1-C6-alkoxy, substituted or unsubstituted,
• C6-C14-aryloxy,
• SiR5R6R7 and O—SiR5R6R7;
• five- to six-membered nitrogen-containing heteroaryl radicals, unsubstituted or substituted by one or more identical or different substituents selected from among
• C1-C18-alkyl, substituted or unsubstituted,
• C2-C18-alkenyl, substituted or unsubstituted,
• C3-C12-cycloalkyl,
• C7-C13-aralkyl,
• C6-C14-aryl,
• halogen,
• C1-C6-alkoxy,
• C6-C14-aryloxy,
• SiR5R6R7 and O—SiR5R6R7;
• R2 is C6-C14-aryl, unsubstituted or substituted by one or more identical or different substituents, or a five- to six-membered nitrogen-containing heteroaryl radical, unsubstituted or substituted by one or more identical or different substituents, where the substituents are as defined above;
• R3 is C1-C18-alkyl, C2-C18-alkenyl, substituted or unsubstituted, having from one to 4 isolated or conjugated double bonds, C3-C12-cycloalkyl, substituted or unsubstituted, C7-C13-aralkyl, C6-C14-aryl, unsubstituted or substituted by or more identical or different substituents, or a five- to six-membered nitrogen-containing heteroaryl radical, unsubstituted or substituted by one or more identical or different substituents, where the substituents are as defined above;
• where adjacent radicals R1 to R4 may be joined to one another to form a 5- to 12-membered ring which may in turn bear substituents selected from among C1-C8-alkyl, substituted or unsubstituted, C2-C8-alkenyl, substituted or unsubstituted, having from one to 4 isolated or conjugated double bonds, C3-C12-cycloalkyl, substituted or unsubstituted, C7-C13-aralkyl and C6-C14-aryl;
• L1 is an uncharged organic or inorganic ligand,
• R5 to R7 are identical or different and are selected from among hydrogen, C1-C8-alkyl, C3-C12-cycloalkyl, C7-C13-aralkyl and C6-C14-aryl.