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ChemOffice.Com - CambridgeSoft

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Administrator<br />

Refining a Model<br />

After building a 3D structure, you may need to<br />

clean it up. For example, if your model was built<br />

without automatic rectification, atom type<br />

assignment, or standard measurements, you can<br />

apply these as a refinement.<br />

Rectifying Atoms<br />

To rectify the selected atoms in your model:<br />

• From the Structure menu, choose Rectify.<br />

Hydrogen atoms are added and deleted so that<br />

each selected atom is bonded to the correct<br />

number of atoms as specified by the geometry<br />

for its atom type. This command also assigns<br />

atom types before rectification.<br />

The atom types of the selected atoms are<br />

changed so that they are consistent with the<br />

bound-to orders and bound-to types of<br />

adjacent atoms.<br />

Cleaning Up a Model<br />

Normally, Chem3D creates approximately correct<br />

structures. However, it is possible to create<br />

unrealistic structures, especially when you build<br />

strained ring systems. To correct unrealistic bond<br />

lengths and bond angles use the Clean Up Structure<br />

command.<br />

To clean up the selected atoms in a model:<br />

• From the Structure menu, choose Clean Up .<br />

The selected atoms are repositioned to reduce<br />

errors in bond lengths and bond angles. Planar<br />

atoms are flattened and dihedral angles around<br />

double bonds are rotated to 0 or 180 degrees.<br />

68 •Building and Editing Models <strong>CambridgeSoft</strong><br />

Refining a Model

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