LINEAR TETRAPHOSPHINE TETRAOXIDE, RARE-EARTH METAL COMPLEX COMPRISING THE LINEAR TETRAPHOSPHINE TET

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PROBLEM TO BE SOLVED : To provide a ligand for achieving a rare-earth metal complex stably exerting high emission intensity and exhibiting high solubility to organic media. SOLUTION : A linear tetraphosphine tetraoxide represented by general formula (1) [wherein, R1, R2, R3, R4, R5 and R6 represent the same or different (substituted) saturated hydrocarbon, (substituted) aryl, (substituted) heteroaryl or (substituted) aralkyl, or R1 and R2, and R5 and R6 on the same phosphorus atom may be bonded to form a ring; and l, m and n each represents the same or different ≥2 integer] is provided. COPYRIGHT : (C)2010, JPO&INPIT