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Journal of Structural Chemistry

2013 year, number 5

CRYSTAL STRUCTURE OF TWO COMPLEXES CONTAINING TRIS-(ОІ-DIKETONATO)MAGNATE ANION

E. S. Vikulova, D. A. Piryazev, K. V. Zherikova, N. I. Alferova, N. B. Morozova, I. K. Igumenov
A. V. Nikolaev Institute of Inorganic Chemistry, Siberian Division, Russian Academy of Sciences, Novosibirsk
Keywords: magnesium, ОІ-diketonates, diamines, single crystal X-ray diffraction, thermogravimetry

Abstract

Single crystal XRD is used to determine the structures of the complexes (H2TMEDA)[Mg(ptac)3]2 (1, TMEDA = Me2N(CH2)2NMe2, ptac = tBuCOCHCOCF3) and (H2TMEDA)[Mg(hfac)3](hfac) (2, hfac = CF3COCHCOCF3) at a temperature of 150 K. The crystallographic data for complex 1: a = 10.2919(3) Å, b = 10.9492(4) Å, c = 15.4159(6) Å, α = 87.117(1)°, β = 89.686(1)°, γ = 79,864(1)°, space group Z = 1, R = 0.0573; for complex 2: a = 12.9446(2) Å, b = 23.0035(4) Å, c = 13.1473(3) Å, α = 90°, β = 98.779(1)°, γ = 90°, space group P21/n, Z = 4, R = 0.0605. The structures are ionic; the metal atom coordinates six oxygen atoms of three β-diketonate ligands. The distances Mg–O in complex 1 are in the range 2.036(2)-2.0920(19) Å; the same distances in complex 2 are in the range 2.051(2)-2.076(2) Å. The spatial packing is determined by the system of hydrogen bonds between the (H2TMEDA)2+ cations and [Mg(ptac)3] (1) or hfac (2) anions. A thermogravimetric study of complex 1 is carried out.