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Two new rare-earth metal chalcogenides,namely RbLu5Te8 and CsMnGdTe3,have been successfully synthesized under high-temperature solid-state reaction conditions and structurally characterized by single-crystal X-ray diffraction analysis.RbLu5Te8 belongs to the monoclinic space group C2/m (no.12) with two formula units in a unit cell: a =22.075(5),b =4.2987(8),c =10.588(2) (A),β =103.89(2)°,V =975.4(4) (A)3,whereas CsMnGdTe3 crystallizes in the orthorhombic space group Cmcm (no.63) with four formula units in a unit cell: a =4.4872(8),b =16.769(3),c =11.807(2) (A) and V=888.4(3) (A)3.In the structure of RbLu5Te8,face-,edgeand vertex-sharing[LuTe6]octahedra are interconnected to produce a three-dimensional (3D) framework with Rb+ lying in the tunnels.The crystal structure of CsMnGdTe3 consists of two-dimensional (2D)[MnGdTe3]-layers of edge-and vertex-sharing[GdTe6]octahedra with Mn atoms filling the tetrahedral interstices,which stack along the b-axis.The Cs atoms are located between the[MnGdTe3]-layers and surrounded by eight Te atoms to form a[CsTe8]bicapped trigonal prism.Moreover,theoretical studies have aided the understanding of their electronic structures.