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Controlled synthesis of twinning β-form anhydrous guanine nanoplatelets in aqueous solution.
Controlled synthesis of twinning β-form anhydrous guanine nanoplatelets in aqueous solution.
- Source :
- CrystEngComm; 4/14/2023, Vol. 25 Issue 14, p2052-2063, 12p
- Publication Year :
- 2023
-
Abstract
- Biogenic twinning β-phase anhydrous guanine nanoplatelets are utilized as optical materials in organisms. However, it is still a puzzle how to produce crystalline guanine platelets in aqueous solutions since guanine has a low solubility in water. Herein, the controlled synthesis of twinning guanine nanoplatelets was realized for the first time in an aqueous solution in the presence of poly(1-vinylpyrrolidone-co-vinyl-acetate) via ammonia volatilization. The synthesized rectangular twinning guanine nanoplatelets with an exposed (100) face were β-form anhydrous guanine (β-AG), and the twinning angle of the two c-axes was about 83°, similar to the biogenic twinning β-AG nanoplatelets. The length and thickness of the twinning β-AG nanoplatelets were about 2 μm and 42 ± 3 nm, respectively. There were about five to seven layers observed for the synthesized twinning β-AG nanoplatelets, with each layer being as thin as 6 ± 2 nm. It was proposed that amorphous guanine particles are formed as intermediate precursors, which dissolve and recrystallize to single-crystalline β-AG nanoplatelets, and then multilayered twinning β-AG nanoplatelets are formed via π–π interaction with the assistance of the guanine-quartet assembly. The obtained twinning β-AG exhibited a high reflection intensity in the visible and near infrared region and a brilliant pearlescent luster, indicating that they could potentially be applied as optical materials. This work provides a new design strategy to synthesize particular organic molecular crystals with low solubility in water and a novel formation mechanism for twinning organic crystals. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14668033
- Volume :
- 25
- Issue :
- 14
- Database :
- Complementary Index
- Journal :
- CrystEngComm
- Publication Type :
- Academic Journal
- Accession number :
- 162874433
- Full Text :
- https://doi.org/10.1039/d3ce00063j