The　title　complex,　C55H41O6N2Eu,　Mr　=　979.91,　crystallizes　in　the　monoclinic　space　group　C2　c　with　a　=　2.041　3　(4),　b　=　2.555　6　(5),　c　=　0.892　6　(3)　nm,　β　=　104.64　(2)　°,　μ　=　14.44cm-1,　T　=　295　K　and　the　final　R　=　0.043.　The　structure　was　solved　by　the　heavy-atom　method　and　refined　by　the　full-matrix　least-squares　technique　for　64　non-hydrogen　atoms　anisotropically　for　2　180　reflections　with　I　≥　3σ(I).　The　title　complex　forms　one-dimensional　chains　through　CC　bonds　between　pyridine　rings　of　4,　4′-bipyridine.　The　central　Eu(III)　ion　is　coordinated　to　six　oxygen　atoms　and　two　nitrogen　atoms　and　its　polyhedron　is　a　distorted　square　antiprism.　The　high　resolution　laser　excited　excitation　and　luminescence　spectra　show　that　the　complex　possesses　two　Eu(III)　sites　with　the　energy　difference　39cm-1　of　5D0　levels　in　excited　state.　The　radiationless　energy　transfer　to　a　great　extent　between　the　two　Eu(III)　sites　and　the　dominant　luminescence　of　Eu(III)　site　with　lower　energy　as　the　complex　was　excited　have　been　supported　by　the　selectively　excited　luminescence　spectra,　time-resolved　luminescence　spectra　and　selectively　excited　luminescence　decay　curves.　©　1995.