527697-43-4Relevant articles and documents
Thallium complexes of meso-tetra-(p-chlorophenyl)porphyrin: Trifluoroacetato-[meso-tetra(p-chlorophenyl) porphyrinato]thallium(III) and pentafluoropropionato-[meso-tetra(p-chlorophenyl)porphyrinato]thallium(III)
Lee, Yu-Yi,Chen, Jyh-Horung,Hsieh, Hsi-Ying,Liao, Feng-Ling,Wang, Sue-Lein,Tung, Jo-Yu,Elango, Shanmugham
, p. 252 - 258 (2003)
The crystal structures of trifluoroacetato-[meso-tetra(p-chlorophenyl)porphyrinatolthallium(III), Tl[(p-Cl)4tpp](O2-CCF3) (1), and pentafluoropropionato-[meso-tetra(p-chlorophenyl)porphyrinato]thallium(III) Tl[(p-Cl)4tpp](O2CCF2CF3) (2), were determined. The coordination sphere around the Tl3+ ion is described as five-coordinate regular square-based pyramid (RSBP) in which the apical site is occupied by an unidentate CF3CO2- ligand for 1 whereas the unidentate CF3CF2CO2- ligand occupies the axial site for 2. The plane of the four pyrrole nitrogen atoms [i.e., N(1)-N(4)] strongly bonded to Tl3+ is adopted as a reference plane 4N. The Tl3+ is moderately out of the 4N plane; its displacement of 0.58 ? (or 0.59 ?) for 1 (or 2) is in the same direction as that of the trifluoroacetate oxygen for 1 (or pentafluoropropionate oxygen for 2). The free energy of activation at the coalescence temperature Tc for the intermolecular trifluoroacetate exchange for 1 in CD2Cl2 is found to be ΔG178≠ = 36.6 kJ/mol whereas the intermolecular pentafluoropropionate exchange for 2 in CD2Cl2 is determined to be ΔG213≠ = 41.5 kJ/mol through 19F and 13C NMR temperature-dependent measurements.
