<sup>35</sup>Cl NQR, Crystal Structure, and Pyroelectricity of 2,3-Dichloro-1,4-naphthoquinone

Brummer, Stefanie; Sohling, Ulrich; Weiß, Alarich

doi:10.1515/zna-1990-3-411

Cited by 6 publications

References 5 publications

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Crystal Growth Mechanism Determined by Crystallographic and Affine Symmetries

Silber

Follner

2000

Cryst. Res. Technol.

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Crystallographic and affine symmetries are the important factors influencing crystal growth. In order to grow quickly, particularly in the initial stage, a crystal requires low indexed faces with thin growth layers. Such periods are produced when the net plane distances are divided by symmetries, predominantly those with glide components. The effectiveness of crystallographic and affine screw axes and glide planes, and hence the growth rate of these faces, depends on the position of the symmetry elements in relation to the lattice planes. The influence of local affine symmetries on crystal growth is not yet known. An analysis was carried out of the symmetries present in the crystal structures of 2,3‐dichloro‐1,4‐naphthoquinone, amidopyrine (P‐1) and glycolic acid (P21/c), each with two crystallographically independent molecules in the asymmetric unit. The growth forms were calculated.

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Crystal Growth Mechanism Determined by Crystallographic and Affine Symmetries

Silber

Follner

2000

Cryst. Res. Technol.

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Crystal Growth Mechanism Determined by Crystallographic and Affine Symmetries. Part II

Silber

Follner

2001

Cryst. Res. Technol.

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As shown in Part I, in the case of organic substances with two crystallographically independent molecules, crystallographic and affine symmetries determine crystal growth. The Fourier transform method was used to calculate the theoretical growth forms. The morphological lattice necessary for these calculations can be derived from an affine or klassengleiche supergroup of the structural space group. It can be shown that growth is influenced not only by the geometric effectiveness of the symmetry elements but also by physical factors such as differences in conformation and external factors. The theoretical growth forms were also calculated using attachment energies (Hartman method). A better correspondence to the observed crystals is obtained when the affine symmetries are also considered in these calculations. For these investigations, the crystal structures of 2,3‐dichloro‐1,4‐naphthoquinone, amidopyrine (P$\bar 1$), glycolic acid, malonamide and cyanoacetamide (P21/c) were used. All of these structures contain two crystallographically independent molecules in the unit cell.

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Electron Spin Resonance and Nuclear Quadrupole Resonance

Geoffroy

Lücken

2009

Patai's Chemistry of Functional Groups

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³⁵Cl NQR, Crystal Structure, and Pyroelectricity of 2,3-Dichloro-1,4-naphthoquinone

Cited by 6 publications

References 5 publications

Crystal Growth Mechanism Determined by Crystallographic and Affine Symmetries

Crystal Growth Mechanism Determined by Crystallographic and Affine Symmetries

Crystal Growth Mechanism Determined by Crystallographic and Affine Symmetries. Part II

Electron Spin Resonance and Nuclear Quadrupole Resonance

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35Cl NQR, Crystal Structure, and Pyroelectricity of 2,3-Dichloro-1,4-naphthoquinone

Cited by 6 publications

References 5 publications

Crystal Growth Mechanism Determined by Crystallographic and Affine Symmetries

Crystal Growth Mechanism Determined by Crystallographic and Affine Symmetries

Crystal Growth Mechanism Determined by Crystallographic and Affine Symmetries. Part II

Electron Spin Resonance and Nuclear Quadrupole Resonance

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Product

Resources

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³⁵Cl NQR, Crystal Structure, and Pyroelectricity of 2,3-Dichloro-1,4-naphthoquinone