Crystal structure of bis-(ammonium) bis-[penta-aqua-(di-methyl-formamide)-zinc(II)] deca-vanadate tetra-hydrate

Arash Ebrahimi; Róbert Gyepes; Marek Bujdoš; Lukáš Krivosudský

doi:10.1107/S2056989022003449

Crystal structure of bis-(ammonium) bis-[penta-aqua-(di-methyl-formamide)-zinc(II)] deca-vanadate tetra-hydrate

Acta Crystallogr E Crystallogr Commun. 2022 Apr 5;78(Pt 5):481-484. doi: 10.1107/S2056989022003449. eCollection 2022 May 1.

Authors

Arash Ebrahimi¹, Róbert Gyepes², Marek Bujdoš³, Lukáš Krivosudský¹

Affiliations

¹ Comenius University in Bratislava, Faculty of Natural Sciences, Department of Inorganic Chemistry, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia.
² Charles University, Department of Inorganic Chemistry, Hlavova 2030, Prague, 128 00, Czech Republic.
³ Comenius University in Bratislava, Faculty of Natural Sciences, Institute of Laboratory Research on Geomaterials, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia.

Abstract

The crystalline product (NH₄)₂[Zn(C₃H₇NO)(H₂O)₅]₂[V₁₀O₂₈]·4H₂O was success-fully isolated from an H₂O/DMF solvent combination by evaporation at ambient temperature. The salt crystallizes in the P2₁/n space group. Imidazole, initially used in the synthesis but not present in the product, and DMF solvent appear to affect the synthesis and crystallization as structural-directing agents. In the title compound, the complex cation [Zn(H₂O)₅(DMF)]²⁺ acts as a counter-ion without being directly coordinated to the deca-vanadate anion. An extensive framework of hydrogen bonds integrates the whole architecture as evidenced by X-ray crystallography. The polyoxometalate [V₁₀O₂₈]^6- lies on a center of symmetry while the complex cation [Zn(H₂O)₅(DMF)]²⁺ links three adjacent anions through a set of 2 + 2 + 3 hydrogen bonds.

Keywords: crystal structure; decavanadate; hydrogen bonds; polyoxometalate; zinc complexes.

Grants and funding

The authors are grateful for support from the Scientific Grant Agency of the Ministry of Education of Slovak Republic and Slovak Academy of Sciences VEGA, Project No. 1/0669/22.