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Inorganics 2019, 7(2), 22; https://doi.org/10.3390/inorganics7020022

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

Faculty of Mathematics and Natural Sciences, Institute of Inorganic Chemistry, University of Cologne, Greinstraße 6, D-50939 Cologne, Germany
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Received: 11 January 2019 / Revised: 2 February 2019 / Accepted: 10 February 2019 / Published: 14 February 2019
(This article belongs to the Special Issue Mixed Metal Oxides)
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Abstract

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(OtBu)4Cl(THF)2] (1) and [LiCr(OtBu)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. View Full-Text
Keywords: heterometallic; heteroarylalkenol; precursors; solvothermal; nanoparticles heterometallic; heteroarylalkenol; precursors; solvothermal; nanoparticles
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Ojelere, O.; Graf, D.; Mathur, S. Molecularly Engineered Lithium–Chromium Alkoxide for Selective Synthesis of LiCrO2 and Li2CrO4 Nanomaterials. Inorganics 2019, 7, 22.

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