Heterometallic molecular precursor Li2Mn2L6 with β-keto ester ligand has been prepared by solution method on a large scale with nearly quantitative yield. Crystallographic analysis revealed the cyclic tetranuclear structure supported by unsymmetric ligands that exhibit different bridging properties at their two ends. DART mass-spectrometry and multinuclear NMR spectroscopy unambiguously confirmed the retention of heterometallic structure in both gas-phase and solution. Precursor was found to display a clean, low-temperature decomposition pattern that corresponds to a new low-temperature spinel phase with Li:Mn ratio of 1:1. Phase purity, structure, and composition of new oxide have been investigated. According to thermodiffraction and electron diffraction experiments, the phase undergoes a disproportionation upon heating that results in a mixture of spinel LiMn2O4 and layered Li2MnO3 oxides.

Heterometallic molecular precursor for the preparation of low-temperature Li-Mn oxide

255th National Meeting (2018)

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