Abstract: A new complex (Ph3Sn)(L)·C₁₂H₆O₃ (complex 1) was prepared with triphenyltin hydroxide as substrate and amide acid as ligand. Its composition and structure were characterized by elemental analysis, Xray single crystal diffraction, infrared spectroscopy and nuclear magnetic resonance, and the antitumor activity of the complex was tested by MTT assay. The experimental results show that the crystal structure of complex 1 belongs to monoclinic syngony and P21/c space group. The cell parameters are as follows: a=2238 50(17) nm, b=1202 30(14) nm, c =1441 0(3) nm, α=90000(0)°, β=101217(2)°, γ=90.000(0)°, V=3804 1(9) nm3, Z=4, Dc=
1.509 g/cm3. The complexl  is a monomer structure. The central Sn atom coordinates with O atom in the ligand  carboxyl group to form a distorted tetrahedral geometric coordination configuration with coordination number 4. In the crystal structure of complex 1, there is π…π interaction betwwen ligand and free anhydride naphthalene molecule. The complex 1 has strong inhibitory effect on cancer cells MCF-7 and Hepg2.

Key words: organotin carboxylate, crystal structure, supramolecular structure, antitumor activity