Journal
DALTON TRANSACTIONS
Volume 44, Issue 15, Pages 6871-6879Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5dt00060b
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Funding
- National Center for Science (NCN) in Poland [DEC-2011/03/B/ST5/01019]
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A novel formate [(CH3)(2)NH2][Na0.5Cr0.5(HCOO)(3)] (DMNaCr) was prepared by a solvothermal method. This compound crystallizes in the perovskite-type metal formate framework (space group R (3) over bar) with disordered dimethylammonium (DMA(+)) cations. X-ray diffraction, DSC, Raman and IR studies show that in contrast to the isostructural iron analogue [(CH3)(2)NH2][Na0.5Fe0.5(HCOO)(3)] (DMNaFe), DMNaCr does not exhibit any structural phase transition at low temperatures. This behavior has been attributed to the smaller flexibility of the perovskite-like framework in DMNaCr when compared with that of DMNaFe. Dielectric permittivity data reveal pronounced dielectric relaxation that is attributed to the dynamical rotation of DMA(+) ions. Electron absorption and photoluminescence studies show that this material exhibits efficient emission at low temperatures. A detailed analysis of the optical properties shows that chromium ions are located at the site of intermediate crystal field strength with Dq/B = 2.29.
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