Two Organic Cation Salts Containing Tetra(isothiocyanate)cobaltate(II): Synthesis, Crystal Structures, Spectroscopic, Optical and Magnetic Properties

Abstract

Abstract:Single crystals of two hybrid organic-inorganic molecular solids, benzyl pyridinium tetra(isothiocyanate)cobalt ([BzPy] 2 [Co(NCS) 4 ]) (1) and benzyl quinolinium tetra(isothiocyanate)cobalt ([BzQl] 2 [Co(NCS) 4 ]) (2), were grown using a slow evaporation growth technique at room temperature and their IR, UV-Vis, X-ray crystal structures, luminescence, and magnetism were reported. The crystal structural analysis revealed that two molecular solids crystallize in the monoclinic space group P2 1 /c of 1 and P2 1 /n of 2. The cations form a dimer through weak C-H···π/π···π interactions in 1 and 2, and the adjacent cation (containing N(6) atom) in 2 forms a columnar structure through π···π weak interactions between the quinoline and benzene rings, while the anions in 1 form a layer structure via short S···Co interactions. The anions (A) and cations (C) are arranged alternatively into a column in the sequence of ···A-CC-A-CC-A··· for 1, while the two anions and cationic dimer in 2 form an alliance by the C-H···π, C-H···S and C-H···N hydrogen bonds. A weak S···π interaction was found in 1 and 2. The two molecular solids show a broad fluorescence emission around 400 nm in the solid state at room temperature, and weak antiferromagnetic coupling behavior when the temperature is lowered.

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“…3, The XRD of Co II metal complex of different scale particles is well coincident with each other, and it means that different forms of complexes have the same structure (Guillemet-Fritsch, et al, 2006). The sample has been dried and then scanned in the 2θ range of 10-80° confirming four coordination around Co ion complex (Kavitha and Lakshm, 2017;Zheng, et al, 2017).…”

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“…X-ray diffraction study (I) crystallizes in a triclinic system with the P1 space group. [37][38][39][40][41][42][43][44]. Fig.…”

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“…12 of different scale particles are well coincident with each other, and it means that different forms of complexes have the same structure (Guillemet-Fritsch, et al, 2006). The sample has been dried and then scanned in the 2θ range of 10-80° confirming square planar geometry around Co п ion complex (Kavitha and Lakshm, 2017;Zheng, et al, 2017).…”