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organic compounds
The N atom in the title compound, C19H13NO, lies -0.0365 (14) Å from the plane formed by the fluorene system and the CN distance is 1.143 (2) Å. The CC distance is 1.191 (2) Å, and the ethynyl group deviates slightly from linearity with C-CC-C bond angles of 172.0 (1) and 176.1 (2)°. Terminal CH2 and CH3 groups are 50:50 disordered, with equal C-C distances of 1.408 (3) and 1.406 (3) Å.