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Frontispiece: Monitoring and Understanding the Paraelectric–Ferroelectric Phase Transition in the Metal–Organic Framework [NH 4 ][M(HCOO) 3 ] by Solid‐State NMR Spectroscopy
Author(s) -
Xu Jun,
Lucier Bryan E. G.,
Sinelnikov Regina,
Terskikh Victor V.,
Staroverov Viktor N.,
Huang Yining
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201584162
Subject(s) - phase transition , ferroelectricity , solid state nuclear magnetic resonance , phase (matter) , nuclear magnetic resonance spectroscopy , dielectric , chemistry , transition metal , spectroscopy , materials science , carbon 13 nmr , crystallography , analytical chemistry (journal) , nuclear magnetic resonance , stereochemistry , organic chemistry , condensed matter physics , physics , optoelectronics , quantum mechanics , catalysis
Solid‐State NMR Spectroscopy The [NH 4 ][M(HCOO) 3 ] (M=Mg, Zn) metal–organic framework (MOF) undergoes a paraelectric/ferroelectric phase transition below room temperature. In situ variable temperature 25 Mg, 67 Zn, 14 N, and 13 C solid‐state NMR (SSNMR) experiments permit detailed investigation of the phase transition and temperature‐induced changes within each phase. Pronounced changes in 25 Mg and 67 Zn NMR parameters are linked to subtle changes in the local metal environment, whereas 14 N and 13 C SSNMR experiments confirm that NH 4 + framework hydrogen bonding plays an important role in the phase transition. This approach gave new physical insights and should prove to be useful for investigating electric phenomena in a wide variety of MOFs. For more details, see the Full Paper by Y. Huang et al. on page 14348 ff.