The reaction of Nd2S2O, TiS2 and S at 1000 °C and subsequent chemical transport with I2 yields the new crystalline layered oxysulfide Nd2Ti2S2O5 that possesses a defective Sr3Ti2O7 structure whose cuboctahedral sites within the double-perovskite layers are empty; Nd2Ti2S2O5 is paramagnetic and semiconducting; the synthesis of the isostructural compounds Pr2Ti2S2O5 and Sm2Ti2S2O5 is also reported.
M. Goga, R. Seshadri, V. Ksenofontov, P. Gütlich and W. Tremel, Chem. Commun., 1999, 979 DOI: 10.1039/A809737B
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