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The title compound, C 25 H 24 N 3 O 3 P, was obtained by catalytic phospho­nation of 4′-(4-bromphen­yl)-2,2′:6′,2′′-terpyridine. The terpyridine moiety is nearly planar, the dihedral angles between the central and the outer rings being 4.06 (9) and 5.39 (9)°. The N atoms in the two pyridine rings are oriented nearly anti­periplanar to that of the central ring. The benzene ring is rotated out of the plane of the central ring of the terpyridine unit by 34.65 (6)°.

Diethyl [4-(2,2′:6′,2′′-terpyridine-4′-yl)phenyl]phosphonate