A novel La complex with methyl-2-pyridyl ketone benzoyl hydrazone has been synthesized and determined by single crystal X-ray diffraction. The crystal is monoclinic with space group C2/c, a =1 7081(3) nm, b =1 5660(3) nm, c =1 3512(3) nm, α=90 00°, β=94 39(1)°, γ=90 00°, V =3 6037(12) nm 3, Z =4 . The complex is a ten-coordinated one with a lanthanum ion surrounded by a N 4O 6 set. The crystal structure is stabilized by hydrogen bonds between water molecules and NO - 3 anions. A novel La complex with methyl-2-pyridyl ketone benzoyl hydrazone has been synthesized and determined by single crystal X-ray diffraction. The crystal is monoclinic with space group C2 / c, a = 1 7081 (3) nm, b = (3) nm, c = 1 3512 (3) nm, α = 90 00 °, β = 94 39 (1) °, γ = 90 00 °, V = 3 6037 (12) nm 3, Z = 4. complex is a ten-coordinated one with a lanthanum ion surrounded by a N 4 O 6 set. The crystal structure is stabilized by hydrogen bonds between water molecules and NO - 3 anions.