Nb₃TeCl₇ (Niobium Telluride Chloride)

A layered van der Waals niobium cluster compound in which Nb₃ triangular clusters arrange on a breathing kagome lattice, related to the Nb₃X₈ halide cluster family. Each Nb₃ cluster carries a localized unpaired spin, making it a cluster magnet / Mott-type magnetic semiconductor with flat electronic bands and candidate obstructed-atomic (topological) insulating character. The mixed telluride–chloride anion framework modifies the interlayer coupling and electronic structure relative to the pure halides, making Nb₃TeCl₇ an emerging platform for studying cluster-based magnetism, flat-band correlated physics, and two-dimensional spin-filter barriers.