220761-83-1Relevant articles and documents
Salicylate exchange in meso-tetraphenylporphyrinato salicylato thallium (III), Tl (tpp) (2-OH-C6H4CO2) and 13C NMR investigation of its homolog thiocyanato (meso-tetra-p-tolyl-porphyrinato)thallium (III), Tl (tptp) (SCN)
Lu, Yunn-Yu,Tung, Jo-Yu,Chen, Jyh-Horung,Liao, Feng-Ling,Wang, Sue-Lein,Wang, Shin-Shin,Hwang, Lian-Pin
, p. 145 - 150 (2008/10/08)
This work determines the crystal structure of meso-tetraphenylporphyrinato salicylato thallium (III)S> Tl (tpp) (2-OH-C6H4CO2) (or Tl (tpp) (SA)) The coordination sphere of the Tl3 ion is an approximately square-based pyramid in which a chelating bidentate 2-OH-C6H4CO-2 group occupies the apical site The average Tl (1)-N bond distance is 2221 A and the Tl atom is displaced 076 A from the porphyrin plane The Tl (1)-O(1) and Tl (1)-O(2) distance are 236 (1) and 247 (1) AS> respectively Variable temperature 13C NMR measurements reveal that the salicylato group of Tl (tpp) (SA) in CD2Cl2 solvent undergoes a ligand exchange In the slow exchange regionS> the carbonyl and C1″ carbons of the salicylato group are separately located at 1696 ppm [with a 2J (Tl- 13C) coupling constant of 157 Hz] and 1115 ppm [with a 3J (Tl- 13C) coupling constant of 180 Hz] for Tl (tpp) (SA) in CD2Cl2 at -90°C In the fast exchange regionS> the C*O and C1″ carbons of the 2-OH-C6H4CO-2 ligand in CD2Cl2 at 24°C are singlets at 1698 and 1125 ppmS> respectively The 13C resonance of the axial isocyanato ligand in the compound thiocyanato (meso-tetra-p-tolyl-porphyrinato)thallium (III)S> Tl (tptp) (SCN)S> was observed at 1107 ppm (24°C) with 2J (Tl- 13C) coupling constant 253 Hz This finding suggests that thiocyanato group isS> as thiocyanate typeS> axially coordinated to the Tl atom in Tl (tptp) (SCN) In additionS> there is no SCN - exchange in the same compound.
