Tetrapyridineplatinum(II) Carboxylates: Synthesis and Crystal Structure
I. A. Yakusheva, *, **, M. Yu. Nesterenkoa, b, P. V. Dorovatovskiic, A. B. Kornevd, A. D. Maksimovaa, b, A. S. Popovaa, e, N. V. Cherkashinaa, A. V. Churakova, and M. N. Vargaftika
a Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences,
Moscow, Russia
b Higher Chemical College of the Russian Academy of Sciences, Mendeleev University of Chemical Technology of Russia, Moscow, Russia
c National Research Center Kurchatov Institute, Moscow, Russia
d Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka,
Moscow oblast, Russia
e Peoples’ Friendship University of Russia, Moscow, Russia
Correspondence to: *е-mail: ilya.yakushev@igic.ras.ru
Correspondence to: **е-mail: cs68@mail.ru
Received 12 May, 2022
Abstract—A series of mono- and bimetallic cation-anionic complexes based on the [PtPy4]2+ cation with different single-charge anions of carboxylic acids (RCOO–) is synthesized and structurally characterized. A synthetic approach to the preparation of tetrapyridineplatinum complexes [PtPy4]2+ soluble in polar solvents from available reagents is developed. The reaction of tetrapyridineplatinum dichloride [PtPy4](Cl)2 with silver acetate or trifluoroacetate affords compounds [PtPy4](OOCMe)2·6H2O (I) and [PtPy4](OOCCF3)2· 2H2O (II) in the form of crystalline hydrates (CIF files CCDC nos. 2161100 and 2161101, respectively) in high yields. Other carboxylates can be prepared by the treatment of compound I with an excess of a stronger acid, for example, trifluoroacetic acid, with the formation of the corresponding complex trifluoroacetate [PtPy4](OOCCF3)2·4CF3COOH (IIa) (CIF file CCDC no. 2161102). Another method consists of the displacement of acetic acid with an excess of a lowly volatile acid, for example, pivalic acid, when [PtPy4](Piv)2· 5HPiv (III) is formed from the acid melt, and solvatomorph [PtPy4](Piv)2·4HPiv·3C6H12 (IIIa) (CIF files CCDC nos. 2161103 and 2161104, respectively) is formed in a cyclohexane medium. Heteroanionic heterometallic complex [PtPy4](OOCFc)(OOCMe) (IV) (CIF file CCDC no. 2161105) is shown to be formed by the reaction of complex I with ferrocenecarboxylic acid under mild conditions.
Keywords: platinum, cation-anionic complexes, crystalline hydrates, synthesis, X-ray diffraction analysis, crystal chemistry
DOI: 10.1134/S1070328422700130