What does this research mean for the field?

A new double complex salt, K[Co(NH3)6][Cr2(C3H2O4)4(OH)2]Cl·5.33H2O, can be synthesized via isothermal evaporation and crystallizes in the monoclinic C2/c space group, featuring a rare [Cr2(C2H3O4)4](OH)2]4– dinuclear anion. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

The aim is to synthesize and characterize a new double complex salt with a specific crystal structure.

April 12, 2026

Synthesis and Crystal Structure of a New Double Complex Salt KCo(NH3)6Cr2(C3H2O4)4(OH)2·5.33H2O

Key Points

The aim is to synthesize and characterize a new double complex salt with a specific crystal structure.
Prepared crystals through isothermal evaporation of an aqueous solution.
Used hexammine cobalt(III) chloride, chromium(III) nitrate, and potassium malonate as starting materials.
Characterized the compound's crystallization in a monoclinic crystal system.
The new double complex salt crystallizes in the C2/c space group.
The compound features a rare dinuclear anion structure: [Cr2(C2H3O4)4](OH)2]4–.
Measured crystallographic parameters: a = 13.6657(3) Å, b = 15.2499(3) Å, c = 15.8264(7) Å, β = 114.285(3)°.

Abstract

Crystals of a new double complex salt KCo(NH3)6Cr2(C3H2O4)4(OH)2Cl·5.33H2O (1) are prepared for first time by the isothermal evaporation of an aqueous solution containing hexammine cobalt(III) chloride, chromium(III) nitrate, and potassium malonate. The new compound crystallizes in the monoclinic crystal system, C2/c space group, a = 13.6657(3) Å, b = 15.2499(3) Å, c = 15.8264(7) Å, β = 114.285(3)°, V = 3006.37(2) Å3. The crystal structure of the new compound contains a relatively rare Cr2(C2H3O4)4(OH)2]4– dinuclear anion.

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Cite This Study

Kireev et al. (Sun,) studied this question.

synapsesocial.com/papers/69db37404fe01fead37c52f3 https://doi.org/https://doi.org/10.1134/s0022476626030029

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