Abstract
The reaction of Mn(NCS)2 with a stoichiometric amount of 3-(amino-meth-yl)pyridine in ethanol led to the formation of the title compound, [Mn(NCS)2(C6H8N2)2] n , which is isotypic to its Zn, Co and Cd analogues. The manganese cation is located on a centre of inversion and is octa-hedrally coordinated in an all-trans configuration by two terminal N-bonded thio-cyanate anions as well as four 3-(amino-meth-yl)pyridine co-ligands, of which two coordinate with the pyridine N atom and two with the amino N atom. The 3-(amino-meth-yl)pyridine co-ligands connect the MnII cations into layers extending parallel to (10). These layers are further connected into a three-dimensional network by relatively strong inter-molecular N-H⋯S hydrogen bonding. Comparison of the experimental X-ray powder diffraction pattern with the calculated pattern on the basis of single-crystal data proves the formation of a pure crystalline phase. IR measurements showed the CN stretching vibration of the thio-cyanate anions at 2067 cm-1, which is in agreement with the presence of terminally N-bonded anionic ligands. TG-DTA measurements revealed that the title compound decomposes at about 500 K.
Highlights
We became interested in 3-(aminomethyl)pyridine, because this ligand is able to link metal cations via the pyridine and the amino N atom
The asymmetric unit consists of one MnII cation that is located on a centre of inversion as well as one 3-(aminomethyl)pyridine co-ligand and one thiocyanate anion (Fig. 1)
The MnII cation is octahedrally coordinated by the N atoms of four symmetry-equivalent 3-(aminomethyl)pyridine coligands and two symmetry-equivalent thiocyanate anions
Summary
In contrast to other small-sized ligands such as azide or cyanide anions, thiocyanate anions show many more coordination modes. A variety of structures including discrete complexes (Prananto et al, 2017; Małecki et al, 2011; Wohlert et al, 2014), dimers (Mautner et al, 2015; Wei & Luo, 2010; Jochim et al, 2018), chains (Mautner et al, 2018; Rams et al, 2020), layers (Suckert et al, 2016, 2017) or in very rare cases three-dimensional networks (Suckert et al, 2017) can be observed This structural variability is further enhanced by isomerism, because for an octahedral coordination with three pairs of identical ligands, five different isomers exist, including the all-trans, all-cis and three different cis-cis-trans configurations. Comparison of the experimental X-ray powder diffraction pattern with the calculated pattern based on single-crystal data proved that a pure crystalline phase was obtained (see Fig. S1 in the supporting information); IR investigations revealed that the CN stretching vibration is observed at 2067 cmÀ1, in agreement with the presence of only
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