Molecularly Engineered Lithium–Chromium Alkoxide for Selective Synthesis of LiCrO2 and Li2CrO4 Nanomaterials

Inorganics

Olusola Ojelere¹  David Graf¹  Sanjay Mathur¹ 

[1] Faculty of Mathematics and Natural Sciences, Institute of Inorganic Chemistry, University of Cologne, Greinstraße 6, D-50939 Cologne, Germany;

关键词: heterometallic;    heteroarylalkenol;    precursors;    solvothermal;    nanoparticles;   

DOI  :  10.3390/inorganics7020022

来源: DOAJ

【 摘 要 】

Achieving control over the phase-selective synthesis of mixed metal oxide materials remains a challenge to the synthetic chemist due to diffusion-driven growth, which necessitates the search for new compounds with pre-existent chemical bonds between the phase-forming elements. We report here a simple solvothermal process to fabricate LiCrO₂ and Li₂CrO₄ nanoparticles from bimetallic single-source precursors, demonstrating the distinctive influence of molecular design and calcination conditions on the resulting nanomaterials. The chemical identity of [Li₂Cr(O^tBu)₄Cl(THF)₂] (1) and [LiCr(O^tBu)₂(PyCH=COCF₃)₂(THF)₂] (2) was unambiguously established in the solid state by single-crystal X-ray diffraction, revealing the formation of a coordination polymeric chain in compound 1, whereas electron paramagnetic resonance spectroscopy (EPR) studies revealed a monomeric structure in solution. TEM analysis of synthesized LiCrO₂ nanoparticles showed nearly uniform particles size of approximately 20 nm. The sensitivity of the LiCrO₂ phase towards oxidation was investigated by X-ray diffraction, revealing the formation of the stable Li₂CrO₄ after calcination in air.

【 授权许可】

Unknown