Structural characterization of polymeric potassium salts with 2-thiobarbituric acid: influence of organotin(IV) chlorides on potassium cation solvation.

Kubicki, Maciej; Owczarzak, Anita; Balas, VasiliosΙ.; Hadjikakou, SotirisK.

Slow evaporation of the filtrate derived from the reaction in water between 2-thiobarbituric acid (H2TBA) and equimolar amount of potassium hydroxide results in the formation of crystals of two coordination polymers: unhydrated [K(μ 3-S,O-HTBA)] n (1) and hydrated [K(μ 2-S,O-HTBA)(μ 2-S,O-H2TBA)(μ-H2O)] n (2), which depend on the absence (1) or presence (2) of methanol solutions of organotin chloride. The hydrate 2 was isolated from the filtrates when di-n-butyltin dichloride, dimethyltin(IV) dichloride, diphenyltin(IV) dichloride, tri-n-butyltin chloride, or triphenyltin(IV) chloride were used during the reaction. The crystal structures show that coordination of potassium occurs through the S and O donors. The potassiums have distorted tetragonal bipyramidal and distorted cubic coordination environments in 1 and distorted square antiprism coordination in 2. Both structures exhibit intermolecular N–H ··· O hydrogen-bond interactions, which form TBA chains while the water in 2 produces a richer hydrogen-bonded structure.

POTASSIUM salts; CHEMICAL structure; POLYMERS; BARBITURATES; ORGANOTIN compounds; SOLVATION; EVAPORATION (Chemistry); COORDINATION polymers

Journal of Coordination Chemistry, 2012, Vol 65, Issue 7, p1107

0095-8972

Academic Journal

10.1080/00958972.2012.660148