The title complex of nickel (II) with 3,5-dimethylbenzoic acid, m-methylbenzoic acid and 1,10-phenanthroline was synthesized and characterized. Crystal data for this complex: triclinic, space group P1, a= 1.198 5(2) nm, b=1.315 3(2) nm, c=1.531 8(3) nm, α=92.602(3)°, β=103.292(3) °, γ=114.849(3)°, V=2.1047(6) nm3, Dc=1.361 g·cm-3, Z=2, F(000)=902, final GooF=1.071, R 1=0.0672, wR2=0.1555. The crystal structure shows that the nickel ion is coordinated with four nitrogen atoms of two 1,10-phenanthroline molecules and two oxygen atoms of on...