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General procedure: The preparation procedure for two homoleptic 8-quinolinolato iron(III) complexes (Qa3FeIII and Qb3FeIII) could be found in our recent publication [34].The preparation procedure for two heteroleptic Q3FeIII complexes is described as follows: the ligand Qb or Qa (4mmol) was dissolved in 20ml of anhydrous THF to obtain a solution, designated as ?A?, and FeCl2·4H2O (2mmol) was dissolved in 20ml of THF to form the solution ?B?, to which an excess amount of iron powder was added to prevent oxidation of ferrous ions to ferric ions. The solution ?A? was added dropwise to the solution ?B? under N2 and then the reaction mixture was stirred at room temperature until the ligand Qb or Qa was consumed completely. After the iron powder was removed with a magnetic separation method, another lignad Qa or Qb (2mmol) in anhydrous THF (10ml) was added dropwise to the above reaction mixture under air, and then the reaction mixture was stirred at room temperature until the ligand Qa or Qb was consumed completely. Finally, the resulting precipitate was filtrated and washed with ethanol for three times. After air-drying, a black solid (denoted as Qa1Qb2FeIII or Qa2Qb1FeIII) was obtained in 90-95% yield. The Fe contents of four 8-quinoliolato FeIII complexes were determined by conventional EDTA titration and the results are listed in Table 1. Herein, the found values for Qa3FeIII and Qb3FeIII were in good agreement with those calculated from the corresponding formulae of the hexadentate structures. However, the found value for Qa1Qb2FeIII or Qa2Qb1FeIII was obviously higher than it?s calculated one, this is likely because a small amount of iron powder or tetradentate Qa2FeII/Qb2FeII complexes still remains in the heteroleptic Q3FeIII complex with a hexadentate structure.
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