Preparation of ruthenium(II) chloride complexes of polybasic amines

The reactions of RuCl2[P(C6H5)3]3, RuCl2(tmeda)2, and RuCl2(1,5-COD)(tmeda) with polybasic amines such as pyrazole have been studied. From the phosphine complex, a binuclear complex has been isolated in which one pyrazole has been incorporated, while reactions of the latter two with excess pyrazole lead to the replacement of a tmeda ligand by two pyrazoles.