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Dimethylammonium zinc formate (DMAZnF) is the precursor for a large family ofmultiferroics, materials which display co-existing magnetic and dielectricordering. However, the mechanism underlying these orderings remains unclear.While it is generally believed that the dielectric transition is related to thefreezing of the order-disorder dynamics of the dimethylammonium (DMA+) cation,no quantitative data on this motion are available. We surmise that this is dueto the fact that the timescale of this cationic motion is on the borderline ofthe timescales of experimental techniques used in earlier reports. Usingmultifrequency EPR, we find that the timescale of this motion is ~ 5 x 10 -9 s.Thus, S-band (4 GHz) EPR spectroscopy is presented as the technique of choicefor studying these motional dynamics. This work highlights the value of thelower-frequency end of EPR spectroscopy. The data are interpreted using DFTcalculations and provide direct evidence for the motional freezing model of theferroelectric transition in these metal-organic frameworks with the ABX3perovskite-like architecture.

journal of physical chemistry. c./journal of physical chemistry. c

Measuring Motional Dynamics of (CH$_3$)$_2$ NH$_2^+$ in the  Perovskite-Like Metal--Organic Framework [(CH$_3$)$_2$ NH$_2$][Zn(HCOO)$_3$]:  The Value of Low-Frequency Electron Paramagnetic Resonance