Functionalized imido-bridged Ti(iv) complexes as new building blocks for supramolecular arrangements: Generation of a 1D structure through a Mg-Cl?I-C halogen bonding interaction

摘要

The new functionalized aryl-imido-bridged cyclopentadienyl titanium compounds [TiCl(η~5-C_5Me_5){μ-NR}] _2, R = 4-X-C_6H_4 (X = CN (2a), X = Cl (2b), X = I (2c), X = (OMe) (2d)); 3,5-(OMe)_2C_6H_3 (2e) were prepared and their appropriateness as building blocks for constructing supramolecular structures was evaluated. The presence of a functional group in the para position within the aryl-imido ligand leads to the formation of 1D arrangement for 2a, 2c and 2d through halogen bonding or hydrogen bonding interactions. In particular, the imido titanium complex 2c forms a supramolecular chain with a [MgCl_2·(THF)_4] unit generated in the synthesis where the metallic fragments are connected by C-I?Cl-Mg halogen bonding interactions (XB), being the first example within group 2 metals where the XB motif M-Cl?I-C appears