Nb4 I4 O8

Nb₄I₄O₈ is a mixed-valence niobium oxide-iodide compound belonging to the family of layered transition metal halide oxides, functioning as a semiconductor. This is primarily a research material explored for its unique crystal structure and electronic properties rather than an established commercial compound. The material family is of interest in photocatalysis, optoelectronics, and solid-state chemistry communities due to the potential for tunable band gaps and novel charge-transfer behavior arising from the mixed niobium oxidation states and halide-oxide framework.