Crystal data for C.I. Pigment Yellow 4, α-(1 -hydroxyethylidene)acetanilide-α-azo-(4'-nitrobenzine)

The single-crystal data and powder pattern are reported for C.I. Pigment Yellow 4, α-(1-hydroxyethylidene)acetanilide-α-azo-(4′-nitrobenzene), C₁₆H₁₄N₄O₄ (C.I. No 11665). The powder pattern has been indexed from the single-crystal dimensions; the problems of multiple indexing have been reduced by comparison with single-crystal intensities. Crystal is triclinic, P1 or P, a = 7.691(2), b = 10.247(2), c = 11.195(2) Å, α = 109.00(2), β = 73.80(2), γ = 112.21(2)°, Z = 2, D_x = 1.426 Mg m⁻³. The JCPDS Diffraction File No. for C.I. Pigment Yellow 4 is 33-1985.