Complexes of Zinc, Nickel(II), and Cobalt(II) Cymantrenate Complexes with Pyrazole and 3,5-Dimethylpyrazole: Synthesis and Structural Features

The reaction of cymantrenates M[(OOС5CH4)Mn(CO)3]2(MeOH)4 (M = Zn, Co(II), Ni(II)) with pyrazole (HPz) results in replacement of labile methanol molecules by the heterocyclic ligand and gives mononuclear complexes Zn[(OOCC5H4)Mn(CO)3]2(HPz)2 (I), Ni[(OOCC5H4)Mn(CO)3]2(HPz)4 (II), and Co[(OOCC5H4)Mn(CO)3]2(HPz)4 (III). A similar reaction of cobalt cymantrenate with more basic and sterically bulky 3,5-dimethylpyrazole (HDmpz) gives the complex Co[(OOCC5H4)Mn(CO)3]2(HDmpz)2 (IV). Compounds I–IV were characterized by X-ray diffraction (CCDC nos. 2157671 (I), 2157672 (II), 2157669 (III), and 2157670 (IV)), IR spectroscopy, and elemental analysis.