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- Title
Structural Transformations of Amino-Acid-Based Polymers: Syntheses and Structural Characterization.
- Authors
Tseng, Tien-Wen; Luo, Tzuoo-Tsair; Chiu, Hsiao-Shan; Wang, Chih-Chieh; Lee, Gene-Hsiang; Sheu, Hwo-Shuenn; Lu, Kuang-Lieh
- Abstract
A discrete complex [Zn(tpro)2(H2O)2] (<bold>1</bold>, Htpro = l-thioproline), and two structural isomers of coordination polymers, a 1D chain of [Zn(tpro)2]n (<bold>2</bold>) and a layered structure [Zn(tpro)2]n (<bold>3</bold>), were synthesized and characterized. The discrete complex <bold>1</bold> undergoes a temperature-driven structural transformation, leading to the formation of a 1D helical coordination polymer <bold>2</bold>. Compound <bold>3</bold> is comprised of a 2D homochiral layer network with a (4,4) topology. These layers are mutually linked through hydrogen bonding interactions, resulting in the formation of a 3D network. When <bold>1</bold> is heated, it undergoes nearly complete conversion to the microcrystalline form, i.e., compound <bold>2</bold>, which was confirmed by powder X-ray diffractions (PXRD). The carboxylate motifs could be activated after removing the coordinated water molecules by heating at temperatures of up to 150 °C, their orientations becoming distorted, after which, they attacked the activation sites of the Zn(II) centers, leading to the formation of a 1D helix. Moreover, a portion of the PXRD pattern of <bold>1</bold> was converted into the patterns corresponding to <bold>2</bold> and <bold>3</bold>, and the ratio between <bold>2</bold> and <bold>3</bold> was precisely determined by the simulation study of in-situ synchrotron PXRD expriments. Consequently, such a 0D complex is capable of underdoing structural transformations and can be converted into 1D and/or 2D amino acid-based coordination polymers.
- Subjects
PHASE transitions; AMINO acids; CRYSTAL structure; ISOMERS; COORDINATION polymers; POLYMERIZATION
- Publication
Polymers (20734360), 2018, Vol 10, Issue 4, p360
- ISSN
2073-4360
- Publication type
Article
- DOI
10.3390/polym10040360