Patent ID: 8536334

Claim:
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.