Journal
INORGANIC CHEMISTRY FRONTIERS
Volume 9, Issue 10, Pages 2353-2364Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2qi00187j
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Funding
- University of Wroclaw program IDUB
- National Science Foundation [DMR-1644779]
- Slovak Grant Agencies [APVV 16-0039, APVV 18-0016, VEGA 1/0919/17, VEGA 1/0013/18]
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We report the physicochemical characteristics of novel Co-based pyrrolidinium analogs that exhibit dielectric and magnetic activity, and undergo a complex sequence of phase transitions.
We report the physicochemical characteristics of novel Co-based pyrrolidinium analogs: (C4H10N)(2)CoCl4 (PCC) and (C4H10N)(2)CoBr4 (PCB). Both compounds consist of a zero-dimensional (0D) anionic network and disordered pyrrolidinium cations. The structural origin of the anomalies observed in the electrical measurements has been confirmed by DSC thermograms and X-ray analysis. The crystals under investigations undergo a complex sequence of phase transitions: PCC at 347/353 K (phase I <-> phase II) and 202/257 K (II <-> III) and PCB at 380/381 K (I <-> II) and 256/302 K (II <-> III). The molecular motions of cations in both compounds were analysed based on proton magnetic resonance (H-1 NMR and M-2) measurements, while their magnetic properties were investigated in DC and AC modes. The DC data show magnetic anisotropy, which was confirmed by high-field HF EPR measurements. The AC susceptibility data of PCC reveal slow magnetic relaxation at the applied DC field with two relaxation channels. Given the above this organic-inorganic hybrid can be considered as a rare example of multifunctional materials which exhibit dielectric and magnetic activity.
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