Potassium Hexafluoroacetylacetonate Complex with 18-Crown-6 Ether as a Volatile Precursor of Molecular and Inorganic Films: Thermal and Structural Insights

Potassium Hexafluoroacetylacetonate Complex with 18-Crown-6 Ether as a Volatile Precursor of Molecular and Inorganic Films: Thermal and Structural Insights Full article

Journal

International Journal of Molecular Sciences
ISSN: 1661-6596 , E-ISSN: 1422-0067

Output data

Year: 2026, Volume: 27, Number: 5, Article number : 2148, Pages count : 22 DOI: 10.3390/ijms27052148

Authors

Kochelakov Danil V. ¹ , Vikulova Evgeniia S. ¹ , Kayumova Dina B. ² , Malkerova Irina P. ² , Kuratieva Natalia V. ¹ , Korolkov Ilya V. ¹ , Kompan’kov Nikolay B. ¹ , Klyamer Darya D. ¹ , Alikhanyan Andrey S. ² , Gromilov Sergey A. ¹

Affiliations

1	Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, 3 Lavrentiev Ave., Novosibirsk 630090, Russia
2	Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 31 Leninskii Ave., Moscow 119071, Russia

Funding (1)

Russian Science Foundation

Volatile coordination compounds are widely used as precursors for the gas phase synthe-sis of functional materials. However, such complexes are still very rare for alkali metals, especially for heavy representatives of this family (potassium, rubidium, cesium) due to the tendency to form polymeric structures. This work is devoted to the exploration of a po-tassium hexafluoroacetylacetonate complex with 18-crown-6 ether, K(18C6)(hfac), as a unique volatile precursor with an isolated molecular structure. A convenient synthesis procedure was developed, and key structural features were identified including tempera-ture-dependent effects. The thermal properties of the complex were studied via thermogra-vimetry and measurements of saturated vapor pressure using the Knudsen effusion method with mass spectrometric registration of the gas phase composition. Both from so-lution and the gas phase, the molecular films of K(18C6)(hfac) obtained exhibit a strictly (h00) orientation, where half of the surface cations have a coordination sphere accessible to supramolecular contacts. For the first time, the possibility of producing potassi-um-containing films from a fluorinated precursor by metal–organic chemical vapor depo-sition (MOCVD) has been demonstrated. With oxygen as the reactant gas, potassium fluo-ride forms and interacts with the silicon substrate, while introducing water vapor signifi-cantly reduces the fluorine content, suggesting its suitability for the preparation of oxide films.

Kochelakov D.V. , Vikulova E.S. , Kayumova D.B. , Malkerova I.P. , Kuratieva N.V. , Korolkov I.V. , Kompan’kov N.B. , Klyamer D.D. , Alikhanyan A.S. , Gromilov S.A.
Potassium Hexafluoroacetylacetonate Complex with 18-Crown-6 Ether as a Volatile Precursor of Molecular and Inorganic Films: Thermal and Structural Insights
International Journal of Molecular Sciences. 2026. V.27. N5. 2148 :1-22. DOI: 10.3390/ijms27052148

Submitted:	Jan 21, 2026
Accepted:	Feb 20, 2026
Published print:	Feb 25, 2026
Published online:	Feb 25, 2026

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