Crystal structure of a salt with a protonated sugar cation and a cobalt(II) complex anion: (GlcN–H, K)[Co(NCS)4]·2H2O

• Main Authors: Tim Peppel, Sabine M. L. Detert, Christian Vogel, Martin Köckerling
• Format: Article
• Language: English
• Published: International Union of Crystallography 2019-09-01
• Series: IUCrData
• Subjects: cobalt; glucosamine; ionic liquid; crystal structure
• Online Access: http://scripts.iucr.org/cgi-bin/paper?S2414314619011428

The title compound, d-(+)-glucosammonium potassium tetrathiocyanatocobaltate(II) dihydrate, K(C6H14NO5)[Co(NCS)4]·2H2O or (GlcNH)(K)[Co(NCS)4]·2H2O, has been obtained as a side product of an incomplete salt metathesis reaction of d-(+)-glucosamine hydrochloride (GlcN·HCl) and K2[Co(NCS)4]. The asymmetric unit contains a d-(+)-glucosammonium cation, a potassium cation, a tetraisothiocyanatocobalt(II) complex anion and two water molecules. The water molecules coordinate to the potassium cation, which is further coordinated via three short K+...SCN− contacts involving three [Co(NCS)4]2− complex anions and via three O atoms of two d-(+)-glucosammonium cations, leading to an overall eightfold coordination around the potassium cation. Hydrogen-bonding interactions between the building blocks consolidate the three-dimensional arrangement.