E Purposes and requirements Complex or coordination compound, a class of substances in which a central metal atom is surrounded by other nonmetal atoms. through the preparation of manganese(lll) acetylacetonate, you can be familiar with the following knowledge 1. Master the synthetic methods of complexes 2. Master the operation of mixed solvent recrystallization 3. Review the manipulations of reflux and simple distillation reaction devicePurposes and requirements 1. Master the synthetic methods of complexes 2. Master the operation of mixed solvent recrystallization 3. Review the manipulations of reflux and simple distillation reaction device Complex or Coordination compound, a class of substances in which a central metal atom is surrounded by other nonmetal atoms. Through the preparation of manganese(III) acetyllacetonate, you can be familiar with the following knowledge: