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1.  Dilithium 1,2,5-thia­diazo­lidine-3,4-dione 1,1-dioxide dihydrate 
The title compound, poly[μ-aqua-aqua-μ6-(1,1-dioxo-1λ6,2,5-thia­diazo­lidine-3,4-diolato)-dilithium], [Li2(C2N2O4S)(H2O)2]n or (H2O)2:Li2TDD, forms an infinite three-dimensional structure containing five-coordinate (Li/5) and six-coordinate (Li/6) Li+ cations. Li/5 is coordinated by three water mol­ecules, one carbonyl O atom and one sulfuryl O atom while Li/6 is coordinated by one water mol­ecule, three carbonyl O atoms, and two sulfuryl O atoms. Each water mol­ecule bridges two Li+ cations, while also hydrogen bonding to either one endocyclic N atom and one sulfuryl O atom or two endocyclic N atoms. While the endocyclic N atoms in the anion do not coordinate the Li+ cations, the carbonyl and sulfuryl groups each coordinate three Li+ cations, which gives rise to the infinite three-dimensional structure.
doi:10.1107/S1600536812036379
PMCID: PMC3435632  PMID: 22969505

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