MYb(BH4)4 (M = K, Na) from laboratory X-ray powder data

Area of Science:

• Inorganic Chemistry
• Solid-State Chemistry
• Materials Science

Background:

• Borohydride compounds are of interest for their diverse structural motifs and potential applications.
• Ytterbium borohydrides represent a less explored class of rare-earth metal borohydrides.
• Understanding the synthesis and structure of novel borohydrides is crucial for advancing materials science.

Purpose of the Study:

• To synthesize and characterize new ytterbium borohydride compounds.
• To investigate the crystal structure and packing of the synthesized materials.
• To explore the potential of mechanochemical synthesis for creating novel inorganic compounds.

Main Methods:

• Solid-state mechanochemical synthesis.
• X-ray diffraction for crystal structure determination.
• Analysis of crystallographic data to determine space group and atomic arrangements.

Main Results:

• Successful synthesis of potassium ytterbium tetraborohydride (KYb(BH4)4) and sodium ytterbium tetraborohydride (NaYb(BH4)4).
• Both compounds are isostructural, crystallizing in the Cmcm space group.
• The crystal structure features isolated homoleptic [Yb(BH4)4](-) anions surrounded by M(+) cations (M = Na, K), adopting a distorted NiAs-type packing.

Conclusions:

• Mechanochemical reactions are effective for synthesizing novel borohydrides.
• The synthesized ytterbium borohydrides exhibit a unique crystal structure with implications for understanding rare-earth metal borohydride chemistry.
• The findings contribute to the broader knowledge of inorganic solid-state materials.