Structure and Properties of Magnesium Complexes with Bulky β-Diketones: 2,2,6,6-Tetramethylheptane-3,5-dione and Its Methoxy-Substituted Derivative

Structure and Properties of Magnesium Complexes with Bulky β-Diketones: 2,2,6,6-Tetramethylheptane-3,5-dione and Its Methoxy-Substituted Derivative Full article

Journal

Russian Journal of Coordination Chemistry
ISSN: 1070-3284 , E-ISSN: 1608-3318

Output data

Year: 2025, Volume: 51, Number: 7, Pages: 615–627 Pages count : DOI: 10.1134/S1070328425600408

Authors

Rikhter E.A. ^1,2 , Vikulova E.S. ¹ , Sukhikh T.S. ¹ , Strigunovskaya A.V. ^1,2 , Morozova N.B. ¹

Affiliations

1	Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
2	Novosibirsk National Research State University, Novosibirsk, 630090 Russia

In order to study the effect of bulky terminal substituents in the β-diketonate ligand on the structure and properties of volatile magnesium compounds, complexes with 2,2,6,6-tetramethylheptane-3,5-dione (HThd) and, for the first time, with 2-methoxy-2,6,6-trimethylheptane-3,5-dione (HZis) were obtained. The complexes [Mg2(L)4] (L = Thd (I), Zis (II)), the synthesis intermediates [Mg(H2O)2(L)2] (L = Thd (III), Zis (IV)), and aqua derivative [Mg2(H2O)(Zis)4] (V) were characterized by elemental analysis and IR spectroscopy. The structures of binuclear complexes and the synthesis by-product [Mg7(Zis)6(μ-OH)6]Cl2·5CHCl3 (VI) were established by X-ray diffraction (CCDC nos. 2424128 (Ia, a new polymorph), 2424130 (II), 2424129 (V), 2424126 (V·1/2CHCl3), 2424127 (VI) ). Both [Mg2(L)4] molecules are characterized by asymmetric environment of metal centers (the Mg coordination number (C.N.) is 5, 6), but in I, three μ,κ2:1-ligands occupy bridging positions, while in II, two ligands have different coordinations (μ,κ2:κ1 and μ,κ2(O,O'):κ2(O',OOMe)). The inclusion of water in II to give V is not associated with any significant structural rearrangement, but C.N. of the unsaturated metal center changes from 5 to 6. Thermogravimetric analysis showed that complex I is more volatile and low-melting than II.

Rikhter E.A. , Vikulova E.S. , Sukhikh T.S. , Strigunovskaya A.V. , Morozova N.B.
Structure and Properties of Magnesium Complexes with Bulky β-Diketones: 2,2,6,6-Tetramethylheptane-3,5-dione and Its Methoxy-Substituted Derivative
Russian Journal of Coordination Chemistry. 2025. V.51. N7. P.615–627. DOI: 10.1134/S1070328425600408 WOS

Рихтер Э.А. , Викулова Е.С. , Сухих Т.С. , Стригуновская А.В. , Морозова Н.Б.
Строение и свойства комплексов магния с объемными бета-дикетонами: 2,2,6,6-тетраметилгептан-3,5-дионом и его метокси-замещенным производным
Координационная химия. 2025. Т.51. №10. С.634-647. DOI: 10.7868/S3034549925100047

Published print:

Oct 20, 2025

Web of science:

WOS:001596239000003

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