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The format for Internal coordinates files is as<br />

follows:<br />

1. Line 1 is a comment line ignored by Chem3D.<br />

Each subsequent line begins with the atom<br />

type number of an atom type.<br />

2. Line 2 contains the atom type number of the<br />

Origin atom.<br />

3. Beginning with line 3, the atom type number is<br />

followed by the serial number of the atom to<br />

which the new atom is bonded and the distance<br />

to that atom. In an Internal coordinates file, the<br />

origin atom is always the first distance-defining<br />

atom in the file. All distances are measured in<br />

Angstroms.<br />

4. Beginning with line 4, the distance is followed<br />

by the serial number of the first angle-defining<br />

atom and the angle between the newly defined<br />

atom, the distance-defining atom, and the first<br />

angle-defining atom. All angles are measured in<br />

degrees.<br />

5. Beginning with line 5, the serial number of a<br />

second angle-defining atom and a second<br />

defining angle follows the first angle. Finally, a<br />

number is given that indicates the type of the<br />

second angle. If the second angle type is zero,<br />

the second angle is a dihedral angle: New Atom<br />

– Distance-defining Atom – First Angledefining<br />

Atom – Second Angle-defining Atom.<br />

Otherwise the third angle is a bond angle: New<br />

Atom – Distance-defining Atom – Second<br />

Angle-defining Atom. If the second angle type<br />

is 1, then the new atom is defined using a<br />

Pro-R/Pro-S relationship to the three defining<br />

atoms; if the second angle type is -1, the<br />

relationship is Pro-S.<br />

NOTE: You cannot position an atom in terms of a<br />

later-positioned atom.<br />

The following is a sample of an Internal coordinates<br />

output file for cyclohexanol which was created<br />

from within Chem3D:<br />

1<br />

1 1 1.54146<br />

1 2 1.53525 1 111.7729<br />

1 1 1.53967 2 109.7132 3 -55.6959 0<br />

1 4 1.53592 1 111.703 2 55.3112 0<br />

1 3 1.53415 2 110.7535 1 57.0318 0<br />

6 1 1.40195 2 107.6989 3 -172.6532 0<br />

5 1 1.11742 2 109.39 4 109.39 -1<br />

5 2 1.11629 1 109.41 3 109.41 1<br />

5 2 1.11568 1 109.41 3 109.41 -1<br />

5 3 1.11664 2 109.41 6 109.41 -1<br />

5 3 1.11606 2 109.41 6 109.41 1<br />

5 4 1.11542 1 109.41 5 109.41 1<br />

5 4 1.11493 1 109.41 5 109.41 -1<br />

5 5 1.11664 4 109.41 6 109.41 1<br />

5 5 1.11617 4 109.41 6 109.41 -1<br />

5 6 1.11664 3 109.41 5 109.41 1<br />

Appendices<br />

<strong>ChemOffice</strong> 2005/Appendix File Formats • 625<br />

File Format Examples

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