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Open AccessArticle

Study on Paramagnetic Interactions of (CH3NH3)2CoBr4 Hybrid Perovskites Based on Nuclear Magnetic Resonance (NMR) Relaxation Time

by 1,2,* and 3,4
1
Analytical Laboratory of Advanced Ferroelectric Crystals, Jeonju University, Jeonju 55069, Korea
2
Department of Science Education, Jeonju University, Jeonju 55069, Korea
3
Korea Basic Science Institute, Seoul Western Center, Seoul 120-140, Korea
4
Department of Chemistry, Kyungpook National University, Daegu 41566, Korea
*
Author to whom correspondence should be addressed.
Molecules 2019, 24(16), 2895; https://doi.org/10.3390/molecules24162895
Received: 17 July 2019 / Revised: 24 July 2019 / Accepted: 2 August 2019 / Published: 9 August 2019
(This article belongs to the Special Issue Solid-State NMR Spectroscopy in Materials Chemistry)
The thermal properties of organic–inorganic (CH3NH3)2CoBr4 crystals were investigated using differential scanning calorimetry and thermogravimetric analysis. The phase transition and partial decomposition temperatures were observed at 460 K and 572 K. Nuclear magnetic resonance (NMR) chemical shifts depend on the local field at the site of the resonating nucleus. In addition, temperature-dependent spin–lattice relaxation times (T) were measured using 1H and 13C magic angle spinning NMR to elucidate the paramagnetic interactions of the (CH3NH3)+ cations. The shortening of 1H and 13C T of the (CH3NH3)2CoBr4 crystals are due to the paramagnetic Co2+ effect. Moreover, the physical properties of (CH3NH3)2CoBr4 with paramagnetic ions and those of (CH3NH3)2CdBr4 without paramagnetic ions are reported and compared. View Full-Text
Keywords: organic/inorganic hybrid materials; structure; dynamics; (CH3NH3)2CoBr4; MAS/NMR organic/inorganic hybrid materials; structure; dynamics; (CH3NH3)2CoBr4; MAS/NMR
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Lim, A.R.; Kim, S.H. Study on Paramagnetic Interactions of (CH3NH3)2CoBr4 Hybrid Perovskites Based on Nuclear Magnetic Resonance (NMR) Relaxation Time. Molecules 2019, 24, 2895.

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