Universität zu Köln

Ojelere, Olusola ORCID: 0000-0002-3112-1257, Graf, David and Mathur, Sanjay (2019). Molecularly Engineered Lithium-Chromium Alkoxide for Selective Synthesis of LiCrO2 and Li2CrO4 Nanomaterials. Inorganics, 7 (2). BASEL: MDPI. ISSN 2304-6740

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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((OBu)-Bu-t)(4)Cl(THF)(2)] (1) and [LiCr((OBu)-Bu-t)(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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Ojelere, Olusola UNSPECIFIED orcid.org/0000-0002-3112-1257 UNSPECIFIED Graf, David UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-157388
DOI:	10.3390/inorganics7020022
Journal or Publication Title:	Inorganics
Volume:	7
Number:	2
Date:	2019
Publisher:	MDPI
Place of Publication:	BASEL
ISSN:	2304-6740
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RING-OPENING POLYMERIZATION; METAL ALKOXIDES; SINGLE-SITE; PRECURSORS; CATALYST Multiple languages Chemistry, Inorganic & Nuclear Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15738