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ChemOffice.Com - CambridgeSoft

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• Select the atom or bond, and from the Edit<br />

menu, choose Clear.<br />

• Select the atom or bond and press Delete.<br />

NOTE: If automatic rectification is on, you will not be able<br />

to delete hydrogen atoms. Turn rectification off when editing<br />

a model.<br />

Building With The Text<br />

Tool<br />

The Text tool allows you to enter text that<br />

represents elements, atom types (elements with<br />

specific hybridization), substructures, formal<br />

charges, and serial numbers. The text you enter<br />

must be found in either the Elements, Atom Types,<br />

or Substructures tables. The match must be exact,<br />

including correct capitalization. These tables can be<br />

found in the Parameter Tables list on the View menu.<br />

NOTE: For all discussions below, all the Building control<br />

panel options in the Chem 3D Setting dialog box are<br />

assumed to be turned on.<br />

Some general rules about using the Text Tool are as<br />

follows:<br />

• Text is case sensitive. For example, the correct<br />

way to specify a chlorine atom is Cl. The<br />

correct way to specify the phenyl group<br />

substructure is to type Ph. PH or ph will not be<br />

recognized.<br />

• Pressing the Enter key applies the text to the<br />

model.<br />

• Typing a formal charge directly after an<br />

element symbol will set the formal charge for<br />

that atom. For example PhO- will create a<br />

model of a phenoxide ion instead of phenol.<br />

• If you double click an atom, the contents of the<br />

previous text box are applied to that atom. If<br />

the atom is one of several selected atoms, then<br />

the contents of the previous text box are<br />

applied to all of the selected atoms.<br />

• If a tool other than the Text tool is selected,<br />

double-clicking in the model window is<br />

equivalent to clicking with the Text tool<br />

selected. Triple-clicking in the model window<br />

is equivalent to double-clicking with the Text<br />

tool selected.<br />

The interpretation of the text in a text box depends<br />

on whether atoms are selected as follows:<br />

• If the model window is empty, a model is built<br />

using the text.<br />

• If you have one or more atoms selected, the<br />

text is added to the model at that selection if<br />

possible. If the specifications for a selected<br />

atom are violated, the connection cannot be<br />

made.<br />

• If you have a model in the window, but do not<br />

have anything selected, a second fragment is<br />

added, but is not connected to the model.<br />

• When a text box is visible, you can modify the<br />

selection by Shift+clicking or Shift-dragging<br />

across atoms.<br />

Using Labels<br />

To use an element symbol in a text box:<br />

1. Select the Text tool.<br />

2. Click in the model window.<br />

A text box appears.<br />

3. Type C.<br />

4. Press the Enter key.<br />

A model of methane appears.<br />

The atom type is automatically assigned as a<br />

C Alkane, and the appropriate number of<br />

hydrogens are automatically added.<br />

<strong>ChemOffice</strong> 2005/Chem3D Building and Editing Models • 55<br />

Building With The Text Tool

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