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crystal data
Two members of the family dihalo(2,2′:6′,2′′-terpyridyl)copper(II), Cu(terpy)X2 X = Br−, I−, have been prepared by reaction in solution. They have space groups Ia and P21/a respectively. Powder patterns of Cu(terpy)Br2 and Cu(terpy)I2 have been indexed. Their cell constants are, for the bromide compound: a = 13.791(3), b = 9.291(2), c = 11.477(5) Å, β = 96.94(2)°, U = 1459.8(6) Å3, Dm = 2.05 (4), Dx = 2.07 Mg m−3, Z = 4; and, for the iodide compound: a = 16.216(2), b = 8.804(1), c = 10.958(6) Å, β = 93.55(2)°, U = 1561.7(7) Å3, Dm = 2.32(1), Dx = 2.34 Mg m−3, Z = 4. Crystal physics data are reported. Both follow the Curie–Weiss law and exhibit μeff values of 1.93 BM (17.9 × 10−24 A m2) (307 K) and 1.75 BM (16.23 × 10−24 A m2) (309 K), respectively. The JCPDS Diffraction File Nos. are: Cu(C15H11N3)Br2 33–1986; Cu(C15H11N3)I2 33–1984.