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ChemOffice.Com - CambridgeSoft

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Administrator<br />

When Correct Atom Types and Rectify settings<br />

are selected in the Building control panel, the<br />

atom type is set according to the bond tool<br />

used (C Alkane in this example) and the<br />

appropriate number of hydrogens are added.<br />

To add bonds to the model:<br />

4. Point to an atom and drag in the direction you<br />

want to create another atom.<br />

bond allows you to specify a connection between<br />

two atoms without a strict definition of the type of<br />

bond. This bond is often used in coordination<br />

complexes for inorganic compounds, where<br />

another element might be substituted.<br />

Dummy atoms are also useful for positioning atoms<br />

in a Z-matrix, perhaps for export to another<br />

application for further analysis. This is a common<br />

use when models become large and connectivities<br />

are difficult to specify.<br />

1. Click and hold the<br />

mouse button on an atom<br />

2. Drag in any direction and<br />

release the mouse button<br />

When the Rectify option is set in the Building<br />

control panel, the hydrogen is replaced by a<br />

carbon.<br />

To add an uncoordinated bond and dummy atom:<br />

1. Select the Uncoordinated Bond tool .<br />

2. Point to an atom and drag from the atom.<br />

An uncoordinated bond and a dummy atom<br />

are added to the model. The atom created is<br />

labeled “Du”, the Chem3D element symbol<br />

for Dummy atoms.<br />

Dummy atom<br />

5. Repeat adding bonds until you have the model<br />

you want.<br />

After you have the backbone, you can change<br />

the carbons to different heteroatoms.<br />

Creating Uncoordinated<br />

Bonds<br />

Use the Uncoordinated Bond tool to create an<br />

uncoordinated bond with a dummy atom (labeled<br />

Du). Uncoordinated Bonds and dummy atoms are<br />

ignored in all computations. An uncoordinated<br />

Removing Bonds and Atoms<br />

When you remove bonds and atoms:<br />

• Click a bond to remove only that bond.<br />

• Click an atom to remove the atom and all<br />

attached bonds.<br />

To remove an atom or bond, do one of the<br />

following:<br />

• Click the Eraser tool and click the atom<br />

or bond.<br />

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

Building With the Bond Tools

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