Chem3D Users Manual - CambridgeSoft

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Administrator Refining a Model After building a 3D structure, you may need to clean it up. For example, if your model was built without automatic rectification, atom type assignment, or standard measurements, you can apply these as a refinement. Rectifying Atoms To rectify the selected atoms in your model: • From the Structure menu, choose Rectify. Hydrogen atoms are added and deleted so that each selected atom is bonded to the correct number of atoms as specified by the geometry for its atom type. This command also assigns atom types before rectification. The atom types of the selected atoms are changed so that they are consistent with the bound-to orders and bound-to types of adjacent atoms. Cleaning Up a Model Normally, Chem3D creates approximately correct structures. However, it is possible to create unrealistic structures, especially when you build strained ring systems. To correct unrealistic bond lengths and bond angles use the Clean Up Structure command. To clean up the selected atoms in a model: • From the Structure menu, choose Clean Up . The selected atoms are repositioned to reduce errors in bond lengths and bond angles. Planar atoms are flattened and dihedral angles around double bonds are rotated to 0 or 180 degrees. 90 •Building and Editing Models CambridgeSoft Refining a Model
Chapter 5: Manipulating Models Overview Chem3D provides tools to manipulate the models you create. You can show or hide atoms and select groups to make them easier to manipulate. Molecules can be rotated, aligned, and resized. Selecting Most operations require that the atoms and bonds that are operated on be selected. Selected atoms and bonds are highlighted in the model display. You can change the default highlight color in the Model Settings dialog box. Model Explorer tab Colors and Fonts tab Set Highlight Color To select an atom using the Model Explorer: 1. Open the Model Explorer. 2. Select the atom in the Explorer. The atom is selected in the model. Any previously selected atoms or bonds are deselected. Selecting Single Atoms and Bonds You can select atoms and bonds in the model window or by using the Model Explorer. If the Model Explorer is not active, open it from the View menu. To select an atom or bond in the display window: 1. Click the Select tool . 2. Click the atom or bond. Any previously selected atoms and bonds are deselected. When you click a bond, both atoms on the bond are selected. ChemOffice 2005/Chem3D Manipulating Models • 91 Selecting
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ChemOffice.Com ® ChemOffice ® Che
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License Information ChemOffice, Che
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· Licensed users of ChemOffice Ent
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computer, except as provided below.
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Q: IS IT OK TO COPY MY COLLEAGUE’
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A Guide to CambridgeSoft Manuals An
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Administrator Setting Molecular Sur
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Administrator Methods Available in
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Administrator Defining Atom Types.
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Administrator • CambridgeSoft
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Administrator provides a balance be
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Administrator the activation each t
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Administrator The following table d
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Administrator • Bond Angles—Dis
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Administrator The Building Toolbar
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Administrator The Calculation Toolb
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Administrator 1. Right-click in the
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Administrator • In the Model Sett
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Administrator modes and color setti
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Administrator 30 •Chem3D Basics C
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Administrator 2. Click the ChemDraw
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3. Move the pointer over the C-C bo
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Administrator Add serial numbers an
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Administrator 5. Press the Enter ke
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Administrator The van der Waals int
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Administrator 6. The modified value
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the same wave function and a consta
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Administrator A variety of other ba
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Administrator Molecular wave functi
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Administrator activation barriers.
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3. From the Calculations menu, poin
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minimizing a second model, the mini
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Administrator move to lower the ene
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. Administrator Molecular Dynamics
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Administrator If you want to … Th
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Administrator The Compute Propertie
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Administrator To run a previously c
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Administrator The procedures assume
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Administrator improvements in each
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Administrator • Overall errors in
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Administrator The following table c
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Administrator TRIPLET QUARTET QUINT
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Administrator Chemical symbol ++ ba
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Administrator 4. Click Run. A new m
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Administrator Minimizing Energy Min
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Administrator criteria, to optimize
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Administrator 6. Hold down the S ke
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Administrator Dipole Moment The dip
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Administrator Molecular Surfaces Mo
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The following table contains the ke
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Administrator 3. Click in the model
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Keyword Description 7. On the Prope
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Administrator Hyperfine Coupling Co
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Administrator 198•MOPAC Computati
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Administrator If you want to … re
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Administrator In the Results In tex
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Administrator Repeating a Gaussian
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Property Description Property Descr
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Property Description Error Message
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Administrator Property Electronic E
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Administrator To specify the calcul
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Administrator 3. Click Open. The ap
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Administrator • Server—limits t
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Administrator To perform property c
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The Step 4 of 4 dialog box appears.
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Administrator • From the ChemOffi
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Administrator Accessing the Online
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Administrator To find a structure t
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Administrator 228• Accessing the
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Administrator Performance Below are
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Administrator Defining Substructure
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Administrator If an atom can be ass
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Key Drag Shift+Drag Administrator Q
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Administrator 238• Keyboard Modif
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Administrator Example 3 In Example
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Administrator 14 13 H 2.197 -0.8229
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Administrator Connection tables by
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Administrator FORTRAN Formats The F
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Administrator 41 4 1 0 0 0 0 0 0 0
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Administrator 32 3 12 1 0 0 0 33 3
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Administrator 13 * 3D displacement
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Administrator The field value for C
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Administrator Line 4e: C 1.53597 1
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Administrator CONECT 4 2 9 10 11 CO
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Administrator COMPND ATOM HETATM CO
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Administrator Line 56 -2794 21139 6
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Administrator 7 2 10 1 8 3 6 1 9 3
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Administrator Line 16 6 C -0.559 1.
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Administrator 12. Line 30, “@BOND
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Parameter Table Use Parameter Table
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Administrator 3. Type the informati
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Administrator Geometry The geometry
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Administrator KS The KS, or bond st
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Administrator one attached hydrogen
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Administrator bond length between t
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Administrator R* The R* field is th
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Administrator The V1 torsional cons
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Administrator VDW Interactions The
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Administrator Editing Parameters Yo
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Administrator 6. The pi molecular o
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Administrator Adding Parameters to
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Administrator fragments 84 paramete
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Administrator CC1 see Cartesian coo
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Administrator Copy As Bitmap comman
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Administrator Examining angles, tut
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Administrator density 67 editing 67
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Administrator editing 107 non-bonde
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Administrator repeating jobs 178 RH
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Administrator Rectification, when d
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Administrator all atoms 95 atoms or
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Administrator Translucent surface t
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Desktop Software Enterprise Solutio
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SOLUTIONS Enterprise Solutions APPL
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Desktop to Enterprise Solutions Che
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SOFTWARE E-Notebook Ultra Ultimate
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SOFTWARE ChemDraw Ultra Ultimate Dr
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SOFTWARE Chem3D Ultra Ultimate Mode
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SOFTWARE ChemFinder/Word • Search
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SOFTWARE The Merck Index • Encycl
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SOLUTIONS •Development and deploy
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SOLUTIONS •Adds chemical data typ
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MANAGEMENT •Custom organization o
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MANAGEMENT • Indexes chemical str
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MANAGEMENT • E-Notebook Enterpris
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DISCOVERY • Accessed through your
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DISCOVERY • Integrated with Regis
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DISCOVERY • Reagent lists can be
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DISCOVERY •Effectively manages da
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DISCOVERY • Catalog driven data m
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DATABASES • Fully structure-searc
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DATABASES • Encyclopedic referenc
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DATABASES • Extensive collection
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SERVICES · Business Case Developme
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CS ChemOffice ® Desktop to Enterpr
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Chem3D Users Manual - CambridgeSoft

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