Syntheses and characterization of new Mn^II and Fe^II complexes with 4′-(4-pyridyl)-2,2′ : 6′,2″-terpyridine (pyterpy), [Mn(pyterpy)(MeOH)₂(OAc)](ClO₄) and [Fe(pyterpy)₂](SCN)₂ · MeOH

Abstract

Two new Mn^II and Fe^II complexes with 4′-(4-pyridyl)-2,2′ : 6′,2″-terpyridine (pyterpy), [Mn(pyterpy)(MeOH)₂(OAc)](ClO₄) (1) and [Fe(pyterpy)₂](SCN)₂ · MeOH (2) have been synthesized and characterized by CHN elemental analysis, IR spectroscopy, and structurally analyzed by single-crystal X-ray diffraction. The thermal stabilities of these compounds were studied by thermal gravimetric (TG) and differential thermal analyses (DTA). The potentially tetradentate pyterpy ligand is a tridentate donor to both Mn(II) and Fe(II). The non-coordinated pyridyl interacts via O–H ··· N and C–H ··· N hydrogen bonds with adjacent molecules in 1 and 2, respectively, to form inversion symmetric dimers. Compound 1 is further extended into infinite hydrogen bonded chains via pairs of O–H ··· O_acetate hydrogen bonds.

Keywords:

• Iron(II)
• Manganese(II)
• 4′-(4-Pyridyl)-2,2′ : 6′,2″-terpyridine

Acknowledgments

This work was supported by the Zanjan and Tarbiat Modares Universities. The Smart Apex diffractometer was funded by NSF grant 0087210, by Ohio Board of Regents grant CAP-491, and by YSU.