Mononuclear and Dinuclear Manganese(II) Complexes from the Use of Methyl(2‐pyridyl)ketone Oxime

Abstract

The reactions of methyl(2-pyridyl)ketone oxime, (py)C(Me)NOH, with manganese(II) sulfate monohydrate have been investigated. The reaction between equimolar quantities of MnSO4 · H2O and (py)C(Me)NOH in H2O lead to the dinuclear complex [Mn2(SO4)2{(py)C(Me)NOH}4] · (py)C(Me)NOH, 1 · (py)C(Me)NOH, while employment of NaOMe as base affords the compound [Mn(HCO2)2{(py)C(Me)NOH}2] (2). The structures of both compounds have been determined by single crystal X-ray diffraction. In both complexes, the organic ligand chelates through its nitrogen atoms. The IR data are discussed in terms of the nature of bonding and the structures of the two complexes.

Heteropolyhedral silver compounds containing the polydentate ligandN,N,O-E-[6-(hydroxyimino)ethyl]-1,3,7-trimethyllumazine. Preparation, spectral and XRD structural study and AIM calculations

“…This shift is attributed to the coordination of the neutral oxime nitrogen. 28 In all cases, the infrared spectra show the typical vibration modes of the corresponding counteranion. 36,39,40 In the complex 4, whose XRD structure is not found, the ν(CuN) band of the thiocyanate group appears at 2099 cm −1 .…”

“…This new ligand can behave as a poly-/ambidentate chelating agent and, also, as a bridging ligand in a similar way to 2-pyridyl-oxime derivatives 28 with an additional metal binding site in the carbonyl 4 from the pyrimidine ring. It displays interesting both electronic and structural features which are reflected in its abilities to form layered structures in the solid state due to π-π stacking interactions between heterocyclic groups and, finally, multiple donor centers capable of tightly binding silver(I) atoms to build coordination polymers of different complexity.…”

“…Efforts to date to obtain polymeric or polynuclear products with oxime ligands were mainly focused on pyridyl oxime derivatives; 28,32 the title ligand inserts an additional O4 donor atom which may lead to diverse coordination modes and species. So, research on the coordination behaviour of DLMA-ceMox towards the Ag(I) cation allowed us to isolate complexes containing counteranions with different coordination abilities, such as nitrate (2), perchlorate (3), thiocyanate (4), trifluoromethylsulfonate (5) and tetrafluoroborate (6).…”

Oxime-Bridged Mn6 Clusters Inserted in One-Dimensional Coordination Polymer

“…It is well-known that oxime species can bind to metal adopting different coordination modes. The oximes and their transition metal complexes have found applications in medicine, biology, and catalysis . Moreover, polynuclear manganese­(III) complexes were found to often have large ground-state spin values.…”

Metal imidazolate sulphate frameworks as a variation of zeolitic imidazolate frameworks

“…Although some of the imidazolates in ZIFs are replaced by sulphate (SO 4 2− ) linkers, extended structures can be achieved. Sulphate ions link metal ions in various bridging modes (μ 2 , μ 3 , μ 4 , μ 5 , μ 8 , or μ 10 ), 12 and form sulphate-bridged multi-nuclear functional compounds. 11 Moreover, the formation of MOFs is also possible with combinations of sulphate ions and expanded imidazolate linkers such as di-, 13 tri-, 14 or tetra-imidazolate, 15 where sulphate binds metal ions in a bis-monodentate fashion similar to imidazolate.…”