82639-34-7Relevant academic research and scientific papers
X-ray Crystal and Molecular Structure of the Dimeric 1:1 Dimethyltin(IV) Dichloride Adduct with Diphenylcyclopropenone, 2, at 138 +/- 2 K
Ng, S.-W.,Barnes, C. L.,Hossain, M. B.,Helm, D. van der,Zuckerman, J. J.,Das, V. G. Kumar
, p. 5359 - 5364 (1982)
Dimethyltin(IV) dichloride-diphenylcyclopropenone, C34H32Cl4O2Sn2, forms colorless crystals, mp 111 deg C, in the monoclinic space group C2/c with a = 17.049 (16) Angstroem, b = 10.027 (10) Angstroem, c = 19.834 (16) Angstroem, β = 96.00 (6), V = 3372 Angstroem3, Z = 4, ρcalcd = 1.678 g cm-3.The structure was determined by the heavy atom method from 4890 reflections measured at 138 +/- 2 K on the Enraf-Nonius CAD/4 automatic diffractometer with monochromatic Mo Kα radiation to a final R value of 0.0296 for the 4251 reflections included in the least-squares sums.The dimeric molecule contains six-coordinated tin with the oxygen atom of the ligand and one chlorine atom in a trans position making a Cl(1)-Sn-O angle of 172.32 (5).The angle made by the methyl groups is opened to 142.2 (1), and the octahedron is completed by a roughly trans Cl(2)-Sn-Cl(1') angle of 166.10 (2).The Sn2Cl2 ring is formed by bonded and bridging Angstroem> connections.The tin atom lies 0.0266 (2) Angstroem above the plane formed by the carbons of its two methyl groups, its terminally bonded chlorine , and the chlorine atom bridged to it , in the direction of the Cl(1) atom.The shortest bond is made to the terminal chlorine .The distances in the Sn reflect a normal carbonyl unit, but the intraring distances, d(C=C) and d(C-C) , and C-C(O)-C angle > reflect a more delocalized situation than in the free diphenylcyclopropenone.The ligand system is relatively flat, with the phenyl rings tilted out of the plane of the cyclopropanone system by 2.5 and 8.4.The angle formed by the ligand oxygen and three-carbon ring and the plane containing the C=O->Sn system is 11.7 (2).The Sn2Cl2 ring is almost flat, being bent through dihedral angles of 2.25 (3).The sum of the internal angles is 359.94, with the acute angles at the tin atoms 77.26 (2) and open angles at the chlorines 102.71 (2).Each monomeric unit is related to its other half by a twofold axis.
