Abstract
Abstract A study of the complexation of Ni(II) with 1-(2-pyridinyl)ethanone oxime as a function of pH was carried out. A green complex, dibromobis(1-(2-pyridinyl)ethanone oxime)nickel(II), was isolated at pH 3. This octahedral complex (1) crystallizes in space group P21/n (a = 8.754(2), b = 11.136(3), c = 18.210(4) A, β = 92.18(2)[ddot], Z = 4) and has cis bromide ions (av. Ni-Br = 2.57(2) A), cis pyridine nitrogens (av. Ni-N = 2.091(9) A), and trans oxime nitrogens (av. Ni-N = 2.043(7) A). An orange octahedral complex, diaquo(1-(2-pyridinyl)ethanone oxime)(1-(2-pyridinyl)ethanone oximato)nickel(II) nitrate, (2) crystallized at pH 6 in space group P21/c (a = 12.497(3), b = 7.501(2), c = 20.940(5) A, β = 95.59(2)[ddot], Z = 4) and has trans water molecules (av. Ni-O = 2.069(5) A), cis pyridine nitrogens (av. Ni-N = 2.109(5) A, and cis oxime nitrogens (av. Ni-N = 2.037(6) A). Complex (2) has a short intramolecular hydrogen bond between oxime oxygen atoms (O…O = 2.524(3) A). A dark reddish-brown complex form...
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