Abstract
The asymmetric unit of the title compound, [Mn(NCS)2(C12H9NO)4], consists of one MnII cation located on a centre of inversion, one thio-cyanate anion and two 4-benzoyl-pyridine co-ligands. The MnII cation is octa-hedrally coordinated by two terminally N-bonded anionic ligands and four N-bonded 4-benzoyl-pyridine co-ligands within a slightly distorted octa-hedron. Individual complexes are linked by inter-molecular C-H⋯O hydrogen-bonding inter-actions into chains running along the c-axis direction. Simultaneous thermogravimetry and differential scanning calorimetry measurements reveal a decomposition in two separate steps, in each of which two co-ligands are removed. The compound obtained after the first step has the composition [Mn(NCS)2(C12H9NO)2] and is of unknown structure, before in the second step decomposition into [Mn(NCS)2] is observed. Magnetic susceptibility measurements show the MnII cations to be in the high-spin state, and that weak anti-ferromagnetic inter-actions between the complexes are present.
Highlights
The asymmetric unit of the title compound, [Mn(NCS)2(C12H9NO)4], consists of one MnII cation located on a centre of inversion, one thiocyanate anion and two 4-benzoylpyridine co-ligands
We have reported the syntheses, structures and magnetic properties of a number of compounds, in which transition metal cations such as MnII, FeII, CoII and NiII are octahedrally coordinated by two neutral N-donor co-ligands and four thiocyanate anions and are linked into linear or corrugated chains by pairs of anionic ligands (Suckert et al, 2017a; Werner et al, 2015; Wohlert et al, 2013, 2014a,b)
From the temperature-independent susceptibility curve, it is obvious that dominating antiferromagnetic interactions are present, which is frequently observed for similar discrete complexes based on [Mn(NCS)2]
Summary
Thiocyanate anions are versatile ligands that, in combination with neutral organic co-ligands, can form coordination compounds and polymers of different dimensionality. The bridging mode is of special interest because magnetic exchange can be mediated by the anionic ligands (Palion-Gazda et al, 2015; Mekuimemba et al, 2018; Gonzalez et al, 2012; Guillet et al, 2016) In this context, we have reported the syntheses, structures and magnetic properties of a number of compounds, in which transition metal cations such as MnII, FeII, CoII and NiII are octahedrally coordinated by two neutral N-donor co-ligands and four thiocyanate anions and are linked into linear or corrugated chains by pairs of anionic ligands (Suckert et al, 2017a; Werner et al, 2015; Wohlert et al, 2013, 2014a,b). There are weak intramolecular C—HÁ Á ÁN interactions between some of the aromatic hydrogen atoms and the thiocyanate N atoms, which might contribute to the stabilization of the conformation of the complex (Table 2)
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