Structural study of new hydrocarbon nano-crystals by energy-filtered electron diffraction

被引：2

作者：

Wu, JS

Melcer, N

Sharp, WP

O'Keeffe, M

Spence, JCH ^{[1
]}

Yaghi, OM

机构：

[1] Arizona State Univ, Dept Phys & Astron, Tempe, AZ 85287 USA

[2] Univ Michigan, Dept Chem, Mat Design & Discovery Grp, Ann Arbor, MI 48109 USA

[3] Arizona State Univ, Dept Plant Biol, Tempe, AZ 85287 USA

[4] Arizona State Univ, Dept Chem, Tempe, AZ 85287 USA

来源：

ULTRAMICROSCOPY | 2004年 / 98卷 / 2-4期

关键词：

electron diffraction; electron microscopy; electron crystallography; structure of organic crystal; molecular structure;

D O I：

10.1016/j.ultramic.2003.08.007

中图分类号：

TH742 [显微镜];

学科分类号：

摘要：

A new brittle hydrocarbon has been successfully synthesized in polycrystalline form, and its crystal structure solved by quantitative electron diffraction. By 3D tilting of the nano-crystals, the lattice type and unit cell parameters were determined. (Triclinic, a = 6.03 Angstrom, b = 6.23 Angstrom, c = 13.86 Angstrom, alpha = 87.26degrees, beta = 106.69degrees, and gamma = 119.01degrees.) Spot diffraction patterns were obtained at -165degrees C using the Koehler selected-area mode on a LEO 912 TEM fitted with an omega in-column elastic energy filter. The direct methods algorithm was then applied to merged intensities and a trial structure obtained assuming single scattering. This was further refined to obtain good agreement with a small residual of about 10% using multiple scattering calculations. A diagram of the proposed structure is given. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：145 / 150

页数：6

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