A　purely　organic　compound,　4-(9-oxoacridin-10(9H)-yl)　benzonitrile　(1),　was　synthesized　and　characterized　by　NMR,　UV-Vis,　high　resolution　mass　spectrum,　and　X-ray　single-crystal　structure　analysis.　It　crystallizes　in　monoclinic　system,　space　group　P2(1)/c　with　a　=　9.7420(2),　b　=　10.4967(2),　c　=　14.3896(3)　angstrom,　beta　=　104.755(2)degrees,　V　=　1422.94(5),　Z　=　4,　M-r　=　296.32,　D-c　=　1.383　g/cm(3),　F(000)　=　616,　mu　=　0.690　mm(-1),　GOOF　=　1.035,　the　final　R　=　0.0370　and　wR　=　0.1010　for　2649　observed　reflections　with　I　＞　2　sigma(I).　Compound　1　in　tolune　exhibits　deep　blue　luminescence　with　maximum　emission　peaks　at　403　and　419　nm,　lifetimes　of　3.8　ns　and　quantum　yields　of　phi　=　0.46　at　room　temperature.　The　experimental　and　computational　results　show　that　the　emission　of　the　compound　originates　from　the　acridinone　moiety　and　has　pi-pi*　character.