Formulation of an Unprecedented Potassium Thiadiazolate Framework Via In-Situ Ligand Synthesis

The development of extended structures using s-block metal centres is fairly rare because of the predominance of ionic forces at metal center. The in-situ formation of 1,3,5-thiadiazole-2,5-dithiol ligand and its coordination to potassium metal ions results in the form of air stable green crystals of a novel framework [C2HKN2OS3]. The two-dimensional framework is characterized as P21 space group with the potassium ion, being heptacoordinated. The compound, showed distorted pentagonal bipyramidal coordination geometry due to the larger cationic radius of the potassium. The potassium metal ion is forming a bond with a nitrogen atom of azine nitrogens, two bonds with the oxygen atoms of the two hydroxyl ions and four bonds with the four sulfide ions of thiol moieties of four different thiadiazole rings. The C-S bond distances are in the range of 1.687(4) to 1.760(4) slightly shorter than the ideal value of 1.77 Å for a C(sp2)-S single bond. The thermogravimetric analysis indicates that a successive loss of the ligand occurs in the range of 253.06 oC to 357.53 oC that infers the stability of the compound.

Saghir Abbas, Manzar Sohail, Muhammad Arif Nadeem, Javaid Hussain Zaidi and Saqib Ali