Tetra­amminelithium triamminelithium tris­ulfide, [Li(NH₃)₄][Li(NH₃)₃S₃]

The title compound, [Li(NH₃)₄]⁺[Li(NH₃)₃S₃]⁻, an ammo­niate of the previously unknown lithium tris­ulfide, was obtained from the reaction of lithium and sulfur in liquid ammonia. The asymmetric unit consists of two crystallographically independent formula units. The [Li(NH₃)₄]⁺ cations are close to regular LiN₄ tetra­hedra. The anions contain LiSN₃ tetra­hedra; the S—S—S bond angles are 110.43 (5) and 109.53 (5)°. In the crystal, the components are linked by multiple N—H...S hydrogen bonds. A weak N—H...N hydrogen bond is also present.