The title complex has been synthesized in aqueous solution. The crystal structure of the complex has been determined on a four-circle X-ray diffractometer. The crystal belongs to triclinic, space group P1. The cell parameters are as follows: a=1.5635(5), b=1.6469(6), c=1.7116(3)cm, α=89.07(2), β=73.91(2), γ=65.82(3)°, V=3.839nm^3, Z=1, Dcalc=1.822g/cm^3. In the crystal, there are two different kinds of coordination numbers for each of La(Ⅲ) ion and Cu(Ⅱ) ions. The coordination number of one kind of La(Ⅲ) ion is 8 and that of other kind of La(Ⅲ) ion is 9, and their coordination polyhedron are dicapped and tricapped trigonal prisms, respectively; the coordination number of one kind of Cu(Ⅱ) ion is 5 and that of the other kind of Cu(Ⅱ) ion is 6, forming a square pyramid and octahedron, respectively.

Key words: CRYSTAL STRUCTURE, X-RAY DIFFRACTION ANALYSIS, COPPER COMPLEX, LANTHANUM COMPLEX