Complexes of pivaloyltrifluoroacetonates of potassium and rubidium with 18-crown-6 ether: synthesis, structure, thermal properties

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Abstract

In the search for volatile fluorinated compounds of potassium and rubidium, new complexes of the corresponding pivaloyltrifluoroacetonates (Ptac) with 18-crown-6 ether, [K(18C6)(Ptac)] (I) and [Rb(18C6)(Ptac)] (II), were synthesized. The compounds were characterized by elemental analysis, IR spectroscopy, and X-ray fluorescence analysis, and their structures were studied by X-ray diffraction in the range of 100–400 K (CCDC nos. 2429226–2429232 (I), 2429233–2429239 (II)). The complexes are isostructural and have an insular mononuclear structure, with M…H and M…C contacts involving the tert-butyl group between fragments, forming chains. The thermal expansion tensors are elongated along this direction. X-ray diffraction analysis showed that the rubidium cation in such a complex can complete its coordination sphere with a solvent molecule (chloroform, CCDC no. 2429240 (IIs)). For I, II, and IIs, Hirshfeld surfaces were analyzed and a search for pseudoperiodicity in the crystal packings was carried out by the translational sublattice method. Thermogravimetric analysis showed that, unlike the initial pivaloyltrifluoroacetonates, complexes I and II are volatile and promising for testing in gas-phase processes of thin-film material deposition.

About the authors

D. V. Kochelakov

Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences

Email: kochelakov@niic.nsc.ru
Novosibirsk, Russia

E. S. Vikulova

Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences

Novosibirsk, Russia

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