Abstract
The reaction of Co(NCS)2 with 3-(amino-meth-yl)pyridine as coligand leads to the formation of crystals of the title compound, [Co(NCS)2(C6H8N2)2] n , that were characterized by single-crystal X-ray analysis. In the crystal structure, the CoII cations are octa-hedrally coordinated by two terminal N-bonded thio-cyanate anions as well as two pyridine and two amino N atoms of four symmetry-equivalent 3-(amino-meth-yl)pyridine coligands with all pairs of equivalent atoms in a trans position. The CoII cations are linked by the 3-(amino-meth-yl)pyridine coligands into layers parallel to the ac plane. These layers are further linked by inter-molecular N-H⋯S hydrogen bonding into a three-dimensional network. The purity of the title compound was determined by X-ray powder diffraction and its thermal behavior was investigated by differential scanning calorimetry and thermogravimetry.
Highlights
The reaction of Co(NCS)2 with 3-(aminomethyl)pyridine as coligand leads to the formation of crystals of the title compound, [Co(NCS)2(C6H8N2)2]n, that were characterized by single-crystal X-ray analysis
The purity of the title compound was determined by X-ray powder diffraction and its thermal behavior was investigated by differential scanning calorimetry and thermogravimetry
Which kind of compound is observed depends among other things on the nature of the metal cation, because the synthesis of compounds with bridging anionic ligands is easier with chalcophilic cations such as, for example, CdII, whereas less chalcophilic metal cations such as MnII, FeII and especially CoII and NiII in several cases lead to the formation of compounds with terminal N-bonded thiocyanate anions
Summary
Coordination compounds based on thiocyanate anions show a variety of structures, that can be traced back to the versatile coordination behavior of this ligand (Buckingham, 1994, Wohlert et al, 2014; Werner et al, 2015a). We reacted Co(NCS) with 3-(aminomethyl)pyridine in different molar ratios, which always led to the formation of crystalline powders with the composition Co(NCS)2(3(aminomethylpyridine) (see Synthesis and crystallization) This composition indicated that either the organic coligand does not bridge neighboring metal centers or that only terminal-coordinated thiocyanate anions are present. IR spectroscopic measurements reveal that the CN stretching vibration of the anionic ligand is observed at 2077cmÀ1, which points to the presence of terminal N-bonded anionic ligands (Fig. S1) To prove these assumptions, single crystals were grown and characterized by single-crystal X-ray diffraction, which proves that this crystalline phase is isotypic to the corresponding Cd compound already reported in the literature, in which the CdII or CoII cations are linked into layers by the 3-(aminomethyl)pyridine ligands (see Structural commentary).
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