Synthesis and properties of trimesitylthallium. A comparison of the trimesitylelement compounds of group 13

Article abstract of DOI:10.1002/zaac.19976230150

The reaction of TlCl₃ with MesMgBr (Mes = 2,4,6-Me₃C₆H₂) in THF at 0°C gives trimesitylthallium, TlMes₃ (2). 2 has been characterized with NMR, IR and MS techniques as well as by an X-ray structure determination. 2 crystallizes isostructural to InMes₃ (1a). The molecules of 2 are coordinated by the three mesityl substutients in a planar fashion. A new modification of InMes₃ (1b) could be obtained by recrystallization of InMes₃ from toluene/n-pentane in the space group C2/c. The literature known modification 1a and the new metallane 2 crystallize in the space group P2₁/n. The molecules in 1 b possess C₂-symmetry. The trimesitylelement compounds EMes₃ (E = B, Al, Ga, In, Tl) have been compared with each other.