Production method for ionic metal complex salt using organic compound as ligand

Provided is a method for obtaining an ionic metal complex salt that uses an organic compound as a ligand in which silicon tetrachloride is used as a reaction aid when reacting a metal complex salt containing a fluorine atom with an organic compound that forms a ligand as a result of a reaction. The method is characterized in that silicon tetrafluoride and hydrogen chloride that are produced as a by-product are brought into contact with a hydrofluoric acid solution and thereby detoxified and recovered as a mixture of an aqueous solution of hexafluorosilicic acid and hydrochloric acid. The method makes it possible to industrially produce the desired ionic metal complex salt at a low cost.