Synthesis and characterisation of Co-Mo complexes containing the [Co(C2H8N2)3]2+ cation and [Mo2O7L]4− anion, where L is an oxalic, tartaric, citric or nitrilotriacetic acid residue

► We proposed the new preparation method for NH4(enH2)0.5[Co(en)3][Mo2O7C2O4]·H2O complex. ► We synthesized three new cobalt-molybdenum complex compounds. ► All the synthesized complexes have similar structure.