LiSr2(NCN)I3:: the first empty tetrahedral strontium(II) entity coordinated by carbodiimide units but without strontium-strontium bonding

LiSr2(NCN)I-3, the first extended compound containing empty tetrahedral Sr-4 entities, is synthesized using a new flux route, and it exhibits two interpenetrating three-dimensional networks made up from Sr tetrahedra capped by NCN2- anions on their triangular faces and vertex-sharing LiI6 octahedra.