Abstract: Organotin(IV) carboxylates have expected much attention, owing to the enormous variety ofinteresting structural topologies and theirecological and biological chemistry activity.The ecological and biological chemistry of organotin(IV) carboxylates have been the subjects ofinterest for some time due to their increasingly extensive use inindustry and agriculture.thebiochemical activity of organotin carboxylates is influenced significantly by the structure of themolecule and the coordination number of the tin atoms. One types of diorganotin(IV) complexC53H57NO8Sn2was prepared by reactions of triphenyltin chloride with triethylamine andterimesicacid by ratio of 1:3:3.The complex is characterized by IR and NMR (1H, 13C, 119Sn)spectroscopies and X-ray single crystal diffraction.This copound crystallizes in the monoclinicsystem, space group P21/C with Z= 4.The unit cell dimensions for complex is : a =15.157(3) Å ,b = 20.802(4) Å and c = 15.719(3) Å.Spectroscopic data:IR (KBr, cm-1): 3296(s), 3064(s), 2678(s), 1622(s), 1429(s), 449(m)1H-NMR (DMSO-d6, ppm) δH: 1.06(t, 9H, CH3, J= 7), 2.82(q, 6H, CH2, J=7), 3.17 (s, 3H, CH3),7.34-7.87 (m, 30H, C6H5), 8.39(s, 3H)13C-NMR (DMSO-d6, ppm) δC: 9.4, 45.3, 48.6, 127.6, 128.1, 128.5, 132.4, 135.8, 136.2, 136.5,143.9, 168.4119Sn-NMR (DMSO-d6, ppm) δSn: 257.47