Details

Autor(en) / Beteiligte

• Vikulova, E. S.
• Rikhter, E. A.
• Piryazev, D. A.
• Zherikova, K. V.
• Morozova, N. B.

Titel

STRUCTURE OF MIXED-LIGAND MAGNESIUM DIPIVALOYLMETHANATE COMPLEXES WITH PROPYLENEDIAMINE AND ITS DERIVATIVE

Ist Teil von

• Journal of structural chemistry, 2020-09, Vol.61 (9), p.1405-1413

Ort / Verlag

Moscow: Pleiades Publishing

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The structures of two mixed-ligand [Mg(Q)(thd) 2 ] complexes (thd = 2,2,6,6-tetramethylheptane-3,5-dionate ion (dipivaloylmethanate ion), Q = propane-1,3-diamine (pda), N,N,N′,N′-tetramethylpropane-1,3-diamine (tmpda)) are determined by X-ray crystallography. The structure of the complex with tmpda is determined at 296 K, that of the complex with pda is determined at 296 K and 150 K. Crystallographic data (296 K) for [Mg(pda)(thd) 2 ] I are: space group P , a  = 9.6363(3) Å, b  = 12.1063(4) Å, c  = 14.3401(5) Å, α = 70.6430(10)°, β = 72.7680(10)°, γ = 89.376(2)°, V  = 1500.41(9) Å 3 , Z  = 2. Crystallographic data for [Mg(tmpda)(thd) 2 ] II are: space group С 2/ с , a  = 10.3716(3) Å, b  = 17.3614(4) Å, c  = 19.1577(5) Å, β = 90.8480(10)°, V  = 3449.26(16) Å 3 , Z  = 6. Crystal packings are formed by mononuclear molecules that are organized in dimers by N–H…O hydrogen bonds in the structure of I . Magnesium atoms have a distorted octahedral coordination environment. In I and II molecules, Mg–O bond lengths are comparable and vary in ranges 2.027-2.062 Å and 2.023-2.030 Å respectively; OMgO chelate angles are close to 86°. In complex II , Mg–N bond lengths and the NMgN angle are remarkably larger than those in I : 2.331 vs . 2.193-2.229 Å; 89.6 vs . 84.7°. A comparative analysis of molecular structures and crystal packings of related [Mg(Q)(thd) 2 ] complexes with diamines of propylene and ethylene series is carried out.