Abstract: A novel seven-coordinate dimer {(PhCH₂)₂Sn[2,6-(O₂C)₂C ₅H₃N](CH₃OH)}₂ was synthesized by the reaction of(PhCH₂)₃SnCl with 2,6-pyridine dicarboxylic acid in 1:1 molar ratio in methanol with Et₃N. The structure of the dimmer was characterized by elemental analysis, IR, ¹H NMR, and X-ray single crystal diffraction. The crystal belongs to a triclinic system with space group P1, a=0.962 5(6) nm, b=1.094 7(9) nm, c=1.996(3) nm, α=90.00(2)°, β=87.69(3)°, γ=90.00(3)°, Z=2, V=2.102(6) nm³, μ=1.248 mm^-1, F(000)=1 000, R¹=0.047 6, wR²= 0.078 2. In the crystals of complex, the tin atoms rendered seven-coordinate in a distorted pengonal bipyramidal structure. The complex was tested in vitro against human tumour cell lines, MCF-7 and WiDr, and displayed a higher activity.

Key words: Seven-coordinate organotin complex, 2,6-Pyridine dicarboxylic acid, Synthesis, Crystal structure