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• Position by Dihedrals—Positions an atom<br />

relative to three previously positioned atoms<br />

using a bond distance, a bond angle, and a<br />

dihedral angle. For more information on<br />

changing the internal coordinates see<br />

“Setting Dihedral Angles” on page 64.<br />

• Position by Bond Angles—Positions an<br />

atom relative to three previously positioned<br />

atoms using a bond distance and two bond<br />

angles. For more information on changing<br />

the internal coordinates see “Setting Bond<br />

Angles” on page 64.<br />

• Detect Stereochemistry—Scans the model<br />

and lists the stereocenters in the Output box.<br />

• Invert—Inverts the isomeric form. For<br />

example, to invert a model from the cis- form<br />

to the trans- form, select one of the stereo<br />

centers and use the Invert command.<br />

• Deviation from Plane—When you select four<br />

or more atoms, outputs the RMS deviation<br />

from the plane to the Output window.<br />

• Add Centroid—Adds a centroid to a selected<br />

model or fragment. At least two atoms must be<br />

selected. The centroid and “bonds” to the<br />

selected atoms are displayed, and “bond”<br />

lengths can be viewed in the tool tips. To delete<br />

a centroid, select it and press the Delete or<br />

Backspace key.<br />

• Rectify—Fills the open valences for an atom,<br />

usually with hydrogen atoms. This command is<br />

only useful if the default automatic rectification<br />

is turned off in the Model Settings dialog box.<br />

• Clean Up—Corrects unrealistic bond lengths<br />

and bond angles that may occur when building<br />

models, especially when you build strained ring<br />

systems.<br />

• Overlay—The Overlay submenu provides all<br />

of the commands to enable you to compare<br />

fragments by superimposing one fragment in a<br />

model window over a second fragment. Two<br />

types of overlay are possible: quick, and<br />

minimization. See “Tutorial 6: Overlaying<br />

Models” on page 39, and “<strong>Com</strong>paring Models<br />

by Overlay” on page 105 for information on<br />

each overlay type.<br />

• Dock—The Dock command enables you to<br />

position a fragment into a desired orientation<br />

and proximity relative to a second fragment.<br />

Each fragment remains rigid during the<br />

docking computation.<br />

The Standard Toolbar<br />

The Standard toolbar contains tools for standard<br />

Windows functions, including up to 20 steps of<br />

Undo and Redo.<br />

New File<br />

Open File<br />

Save File<br />

Copy<br />

Cut<br />

Paste<br />

Undo<br />

Redo<br />

Print<br />

About Chem3D<br />

<strong>ChemOffice</strong> 2005/Chem3D Chem3D Basics • 15<br />

The Graphical User Interface

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