Condensation reaction of dimethyltin(IV) oxide with 2-(2,3-dichloroanilino)benzoic acid synthesis and study of a novel dimeric tetraorganodistannoxane
(EN)
Kovala-Demertzi, D.
(EN)
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας
(EL)
Kovala-Demertzi, D.
(EN)
The novel symmetric dimeric tetraorganodistannoxane [(Me2Sn)(4)(DCPA)(2))O-2(OH)(2)] (2) and [(Me2Sn)(4)(DCPA)(2))O-2(OC2H5)(2)](3) where HDCPA is 2-(2,3-dichloroanilino)benzoic acid (1) have been prepared. The crystal structure of 3 has been determined by X-ray crystallography. Three distannoxane rings are present to the centrosymmetric dimeric tetraorganodistannoxane by virtue Of mu(3)-oxo form the central R4Sn2O2 core with a planar Sn2O2 ring, resulting in a ladder type structural motif. Five-coordinated tin atoms are present in the distannoxane dimer. The ligands act as monodentate agents, thus rendering the tin atom five-coordinated. Significant pi -> pi stacking interactions and intramolecular hydrogen bonds stabilize the structure 3. The polar imino hydrogen atom participates in intramolecular hydrogen bonds. The formation of the dimeric distannoxanes 2 and 3 represent a ladder-type carboxylates in which the insertion of a mu(2)-OH or a mu(2)-OC2H5 group occurs. This unusual result can be interpreted in terms of a competition between the strength different donors, in which the -OH or the -OC2H5 groups show higher donor capacity than the carboxylato group of DCPA.
(EN)
