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ChemOffice.Com - CambridgeSoft

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To display the Internal Coordinates table:<br />

1. From the View menu choose Z-Matrix Table.<br />

The Internal Coordinates table appears.<br />

determined by their serial numbers. All of the<br />

atoms in a fragment are listed in consecutive<br />

records. Hydrogen, lone pair and dummy atoms are<br />

listed after heavy atoms.<br />

To display the Cartesian Coordinates table, do one<br />

of the following:<br />

• If the Tables window has been activated, click<br />

the XYZ tab at the bottom of the window.<br />

• If the Tables window has not been activated,<br />

choose Cartesian Table from the View menu.<br />

The Cartesian Coordinates table appears.<br />

The Cartesian Coordinates table acts like the other<br />

tables: you can select atoms or bonds either in the<br />

table or in the model. Use the pin icon to collapse<br />

the window to save space.<br />

Collapsed table tabs<br />

NOTE: The default condition is that all of the tables open<br />

in a tabbed window when you select any one.<br />

When you select a record in the Internal<br />

Coordinates table, the corresponding atom is<br />

selected in the model. When you select atoms in the<br />

model, the corresponding records are selected in<br />

the Internal Coordinates table.<br />

To edit measurements in the Z-matrix:<br />

1. Type a new measurement in the selected cell.<br />

2. Press the Enter key.<br />

To change which atoms Chem3D uses to position<br />

each atom use the commands in the Set Z-matrix<br />

submenu in the Structure menu.<br />

Cartesian Coordinates<br />

The fields in the Cartesian Coordinates table<br />

contain the atom name and the X-, Y- and Z-<br />

coordinates for each atom. The order of atoms is<br />

Mouse over a tab to display<br />

the table. The most recently used<br />

table displays the full name.<br />

<strong>Com</strong>paring Models by<br />

Overlay<br />

The Overlay submenu on the Structure menu is used<br />

to lay one fragment in a model window over a<br />

second fragment. Each fragment remains rigid<br />

during the overlay computation.<br />

<strong>Com</strong>mon uses of Overlay include:<br />

• <strong>Com</strong>paring structural similarities between<br />

models with different composition.<br />

• <strong>Com</strong>paring conformations of the same model.<br />

<strong>ChemOffice</strong> 2005/Chem3D Inspecting Models • 105<br />

<strong>Com</strong>paring Models by Overlay

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