SYNTHESIS AND STRUCTURE OF POLYMERIC [1,3,5-C6H3(CO2ME)3.3TICL4] AND DIMERIC [(MU-1,3,5-C6H3(CO2ME)3)2CL8TI2].2CH2CL2 COMPOUNDS

The reaction Of TiCl4 with trimethyl 1,3,5-benzenetricarboxylate in 1:3.5 and 1:1 ratios in 1,2-dichloroethane and dichloromethane gave [1,3,5-C6H3(CO2Me)3.3TiCl4]n (1) and [{mu-1,3,5-C6H3(CO2Me)3}2Cl8Ti2].2CH2Cl2 (2), respectively. In the crystalline state compound 1 is a two-dimensional polymer. Each of the 1,3,5-C6H3(CO2Me)3 molecules behaves as a bridging ligand, bridging three Ti atoms. The titanium atoms are coordinated to the trimethyl 1,3,5-benzenetricarboxylate ester molecule via carbonyl oxygen atoms and to two bridging and three terminal chlorine atoms. The crystal of 2 consists of dimeric complex molecules with a crystallographic symmetry centre and with dichloromethane molecules located between them. The titanium atoms are octahedrally coordinated by four chlorine atoms and two carbonyl oxygen atoms of two trimethyl 1,3,5-benzenetricarboxylate ligands in the cis position. One Of the -CO2Me ligand groups remains uncoordinated. The phenyl rings are not strictly planar and the average separation between them, in complex molecules is 3.44(1) angstrom.