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- Title
Thermally Triggered Solid-State Single-Crystal-to-Single-Crystal Structural Transformation Accompanies Property Changes.
- Authors
Li, Quan ‐ Quan; Ren, Chun ‐ Yan; Huang, Yang ‐ Yang; Li, Jian ‐ Li; Liu, Ping; Liu, Bin; Liu, Yang; Wang, Yao ‐ Yu
- Abstract
The 1D complex [(CuL0.5H2O) ⋅H2O] n ( 1) (H4L=2,2′-bipyridine-3,3′,6,6′-tetracarboxylic acid) undergoes an irreversible thermally triggered single-crystal-to-single-crystal (SCSC) transformation to produce the 3D anhydrous complex [CuL0.5] n ( 2). This SCSC structural transformation was confirmed by single-crystal X-ray diffraction analysis, thermogravimetric (TG) analysis, powder X-ray diffraction (PXRD) patterns, variable-temperature powder X-ray diffraction (VT-PXRD) patterns, and IR spectroscopy. Structural analyses reveal that in complex 2, though the initial 1D chain is still retained as in complex 1, accompanied with the Cu-bound H2O removed and new O(carboxyl)Cu bond forming, the coordination geometries around the CuII ions vary from a distorted trigonal bipyramid to a distorted square pyramid. With the drastic structural transition, significant property changes are observed. Magnetic analyses show prominent changes from antiferromagnetism to weak ferromagnetism due to the new formed Cu1-O-C-O-Cu4 bridge. The catalytic results demonstrate that, even though both solid-state materials present high catalytic activity for the synthesis of 2-imidazolines derivatives and can be reused, the activation temperature of complex 1 is higher than that of complex 2. In addition, a possible pathway for the SCSC structural transformations is proposed.
- Subjects
CRYSTAL structure; X-ray diffraction; THERMOGRAVIMETRY; BIPYRIDINE; ANTIFERROMAGNETISM
- Publication
Chemistry - A European Journal, 2015, Vol 21, Issue 12, p4703
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201405984