| abstract |
A compound of formula (I) wherein: M is selected from Mo or W; X is selected from O or NR 5 ; R 1 and R 2 are independently selected from H, C 1-6 alkyl, and aryl; C 1-6 alkyl and aryl optionally being substituted with one or more of C 1-6 alkyl, C 1-6 alkoxy, and O—C 6 H 5 ; R 3 is selected from a nitrogen-containing aromatic heterocycle being bound to M via said nitrogen; and from halogen; R 4 is an aryl oxy group being bound to M via said oxygen of said aryl oxy group; wherein said aryl group Ar of said aryl oxy group is bound to a group Cat such to form a cationic ligand Cat + -Z—ArO—, wherein Z is either a covalent bond or a linker; R 5 is alkyl or aryl, optionally substituted. |