Chem3D 8.0 Manual - CambridgeSoft

AdministratorThe interpretation of the text in a text box dependson whether atoms are selected as follows:• If the model window is empty, a model is builtusing the text.• If you have one or more atoms selected, the textis added to the model at that selection ifpossible. If the specifications for a selectedatom are violated, the connection cannot bemade.• If you have a model in the window, but do nothave anything selected, a second fragment isadded, but is not connected to the model.• When a text box is visible, you can modify theselection by Shift-clicking or Shift-draggingacross atoms.LabelsTo use an element symbol in a text box:1. Select the Text Building tool.2. Click in the model window.A text box appears.3. Type C.4. Press Enter.A model of methane appears.The atom type is automatically assigned as aC Alkane, and the appropriate number ofhydrogens are automatically added.To use the same text to add another methyl group:• Point to the atom you want to replace, in thisexample a hydrogen, and double-click.The model is changed to ethane. Notice thatadditional hydrogens are automaticallyremoved.To add a different element:1. Click a hydrogen atom.A text box appears over the atom.2. Type N.3. Press Enter.A nitrogen is added to form ethylamine.To build ethylamine in one step:1. Click in the model window.A text box appears.2. Type CH3CH2NH.3. Press Enter.A model of ethylamine appears.You can use a text box to change the atom type andbonding characteristics.To change the atom type of some atoms:1. Click a carbon atom.A text box appears.2. Shift-click the other carbon atom.Both atoms are selected.3. Type C Alkene.4. Press Enter.The atom type and the bond order are changedto reflect the new model of ethyleneamine. Youcan point at the atoms and bonds to display thisnew information.The Table EditorTo use the Table Editor to enter text in a text box:1. From the View menu, choose Atom Types.TBL.2. Select the element or atom type in the table.3. In the Table Editor, from the Edit menu, chooseCopy.48 • Chapter 4: Building and Editing Models CambridgeSoftBuilding Models With The Text Building Tool