The　crystal　structure　of　tris　(dibenzoylmethanato)　(triphenylphosphine　oxide)europium　(III),　C63H51O7PEu,　has　been　determined　by　single　crystal　X-ray　diffraction.　The　complex　crystallizes　in　the　triclinic　space　group　P　(1)　over　bar　with　two　molecules　in　a　unit　cell.　The　cell　dimensions　are　a=12.336　(3),　b=18.729　(5),　c=11.502　(3)　Angstrom,　alpha=95.86　(2),　beta=103.14　(2),　gamma=87.89　(2)degrees.　The　total　number　of　6969　independent　reflections　was　used　for　the　structure　determination.　The　final　calculated　R　value　is　0.055.　The　central　europium　ion　is　hepta-coordinated　by　seven　oxygen　atoms.　The　polyhedron　is　a　distorted　capped　trigonal　prism　with　the　Eu-O　separation　of　2.305-2.367　Angstrom.　The　high　resolution　excitation　and　emission　spectra　measured　at　77　K　indicate　two　Eu　(III)　sites　in　the　complex.　The　symmetries　of　the　Eu　(III)　sites　are　C-2　nu　and　Cs　respectively.　The　lower　symmetrical　C-s　site　predominates.　A　comparison　of　the　emission　spectra　for　Gd(DBM)(3)TPPO　doped　by　1%　Eu(III)　with　those　for　Eu(DBM)(3)TPPO　complex　shows　no　significant　differences　pointing　to　the　same　two　sites.