The title compound, a mixed (phthalocyaninato)(porphyrinato) yttrium double-decker complex 1, has been synthesized and structurally characterized by X-ray single-crystal diffraction method. Crystal data: monoclinic, space group C2/c, Z = 8, C(79)H(52)Cl(10)N(12)O(4)Y, M(r) = 1676.74, a = 38.217(3), b = 18.9867(13), c = 26.200(3) angstrom, beta = 128.0190(10)degrees, V = 14977(2) angstrom(3), D(c) = 1.487 g/cm(3), mu(MoK alpha) = 1.196 mm(-1), F(000) = 6808, R = 0.0745 and wR = 0.2208 for observed reflections with I > 2 sigma(I). X-ray analysis reveals that the coordination polyhedron adopts a slightly distorted square-antiprismatic structure around the metal center. Both phthalocyanine and porphyrin ligands are saucer-shaped, with the skew angle of the two ligand planes approximately 45 degrees.