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The title compounds 9-ethyl-1,3,6,8-tetra-p-tolyl-9H-carbazole (1) and 9-ethyl-1,3,6,8-tetrakis-(4-fluoro-phenyl)-9H-carbazole (2) were synthesized and characterized by single-crystal X-ray diffraction. Thereinto, the crystal structures of compounds 1 and