Abstract
Reaction of Co(NCS)2 and Zn(NCS)2 with 4-pyridine-thio-amide led to the formation of compounds with composition [Co(NCS)2(C6H6N2S)4]·H2O (1) and [Zn(NCS)2(C6H6N2S)2] (2), respectively. The asymmetric unit of compound 1, consists of one cobalt(II) cation, two thio-cyanate anions, four 4-pyridine-thio-amide ligands and one water mol-ecule whereas that of compound 2 comprises one zinc(II) cation that is located on a twofold rotation axis as well as one thio-cyanate anion and one 4-pyridine-thio-amide ligand in general positions. In the structure of compound 1, the cobalt(II) cations are octa-hedrally coordinated by two terminal N-bonding thio-cyanate anions and by the N atoms of four 4-pyridine-thio-amide ligands, resulting in discrete and slightly distorted octa-hedral complexes. These complexes are linked into a three-dimensional network via inter-molecular N-H⋯S hydrogen bonding between the amino H atoms and the thio-cyanate S atoms. From this arrangement, channels are formed in which the water mol-ecules are embedded and linked to the host structure by inter-molecular O-H⋯S and N-H⋯O hydrogen bonding. In the structure of compound 2, the zinc(II) cations are tetra-hedrally coordinated by two N-bonding thio-cyanate anions and the N atoms of two 4-pyridine-thio-amide ligands into discrete complexes. These complexes are likewise connected into a three-dimensional network by inter-molecular N-H⋯S hydrogen bonding between the amino H atoms and the thio-amide S atoms.
Highlights
Reaction of Co(NCS)2 and Zn(NCS)2 with 4-pyridinethioamide led to the formation of compounds with composition [Co(NCS)2(C6H6N2S)4]ÁH2O (1) and [Zn(NCS)2(C6H6N2S)2] (2), respectively
The asymmetric unit of compound 1, consists of one cobalt(II) cation, two thiocyanate anions, four 4-pyridinethioamide ligands and one water molecule whereas that of compound 2 comprises one zinc(II) cation that is located on a twofold rotation axis as well as one thiocyanate anion and one 4-pyridinethioamide ligand in general positions
These complexes are likewise connected into a threedimensional network by intermolecular N—HÁ Á ÁS hydrogen bonding between the amino H atoms and the thioamide S atoms
Summary
Thio- and selenocyanate anions are useful ligands for the synthesis of new coordination compounds and polymers, because of their versatile coordination behaviour (Massoud et al, 2013; Mousavi et al, 2012; Prananto et al, 2017; Kabesovaet al., 1995) In this regard, compounds with general composition [M(NCS)2(L)2]n (M = MnII, FeII, CoII or NiII; L = neutral N-donor co-ligand) in which the metal cations are linked by these anionic ligands are of special interest, because magnetic exchange can be mediated (Palion-Gazda et al, 2015; Wohlert et al, 2013a). CoII sometimes forms discrete complexes with composition Co(NCS)2(L) in which the cations are tetrahedrally coordinated by two terminal N-bonding thiocyanate anions and the N atoms of two neutral co-ligands In several cases these complexes are isotypic with the corresponding zinc analogues, which enables a simple method for checking whether a tetrahedral Co complex might be present in the mixture.
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