Abstract
The structure of an organic dye 1,5-diaminoanthraquinone (DAAQ) nanowire was studied by both electron diffraction and X-ray powder diffraction. The unit cell of the crystal was determined from a series of tilted selected area electron diffraction patterns (monoclinic: a=3.78Å, b=9.73Å, c=15.01Å and Β=82.4°). By using precession electron diffraction, the following extinction conditions were determined, 0k0: k=2n and 00l: l=2n, which give the space group as P21/C (no. 14). The powder charge flipping algorithm was applied to resolve the phase problem and the structural model of the DAAQ crystal was built.
Original language | English (US) |
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Pages (from-to) | 812-816 |
Number of pages | 5 |
Journal | Ultramicroscopy |
Volume | 111 |
Issue number | 7 |
DOIs | |
State | Published - Jun 1 2011 |
Funding
The work was supported by a seed grant from the Nanoscale Science and Engineering Center at Northwestern ( NSF EEC-0647560 ) and the American Chemical Society Petroleum Research Fund ( 48678-G10 ). TEM and electron diffraction were performed at the EPIC facility of the NUANCE Center, which is supported by NSF-NSEC, NSF-MRSEC, Keck Foundation, the State of Illinois and Northwestern University. The precession electron diffraction work (HH and JMZ) was supported by U.S. Department of Energy, Division of Materials Sciences under Award No. DEFG02-01ER45923. The authors thank Dr. John Spence for his encouragement.
Keywords
- Charge flipping algorithm
- Electron diffraction
- Organic crystal
- Phase problem
- Precession electron diffraction
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Instrumentation