Method for producing 3,7-diaza-bicyclo[3.3.1]nonane metal complexes

1. A method for producing 3,7-diazabicyclo[3.3.1]nonane metal complexes of the formula (2)

[M a L k Z n ]Y m   (2)

wherein

M is selected from the group consisting of the following metals: Mn(II)-(III)-(IV), Cu(I)-(II)-(III), Fe(II)-(III)-(IV)-(V) and Co(I)-(II)-(III);

L is a ligand of the formula (1) or its protonated or deprotonated form, wherein R is hydrogen, hydroxyl, or C 1 -C 4 -alkyl; R 1 is C 1 -C 4 -alkyl, C 6 -C 10 -aryl, pyridinyl-C 1 -C 4 -alkyl, or (CH 2 ) n1 N(CH 3 ) 2 wherein n1 is 1-10; R 2 is C 1 -C 4 -alkyl, or C 6 -C 10 -aryl; R 3 is C 1 -C 4 -alkyl, X is CO═O or C(OH) 2 ,

Z is a coordinating compound selected from mono-, bi- or tri-charged anions or neutral molecules which can coordinate to a metal in mono-, bi- or tri-dentate form;

Y is an anion balancing the charge of the complex;

a is an integer from 1 to 10,

k is an integer from 1 to 10;

n is an integer from 1 to 10,

m is an integer from 1 to 20,

wherein the method comprises dissolving or suspending the ligand L in water and complexing it with a metal salt.

2. The method as claimed in claim 1 , wherein the metal salt is Fe(II) chloride.

3. The method as claimed in claim 1 , wherein iron(1+), chloro[dimethyl 9,9-dihydroxy-3-methyl-2,4-di(2-pyridinyl-N)-7-[(2-pyridinyl-N)methyl]-3,7-diazabicyclo[3.3.1]nonane-1,5-dicarboxylate-N3, N7]-, chloride is produced.

4. The method as claimed in claim 1 , wherein the metal salt for complexing the ligand L is a solid or in the form of an aqueous metal salt solution.

5. The method as claimed in claim 1 , wherein the method is carried out at room temperature.

6. The method as claimed in claim 1 , wherein a is an integer from 1 to 4.

7. The method as claimed in claim 1 , wherein n is an integer from 1 to 4.

8. The method as claimed in claim 1 , wherein m is an integer from 1 to 8.