Rich Talbot
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Articles
Recent activity by Rich Talbot-
ChemDraw: How can I make a double arrow head in order to indicate bondangles
How can I make a double arrow head in order to indicate bond angles? Is there a way to put an arrowhead on the other end of the curved arrow?Solution:You have two options:Draw the curved arrow you ...
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ChemDraw ChemFinder: When I attempt a substructure search, afterentering the structure, Chem3D comes up in the background, and then an error message 'no element tables are available'.
When I attempt a substructure search, after entering the structure, Chem3D comes up in the background, and then an error message 'no element tables are available'. It is then not possible to quit C...
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ChemDraw Chem3D: I am not able to do a MOPAC minimization on any model
I am not able to do a MOPAC minimization on any model. Solution:Set your virtual memory to twice the amount of physical RAM you have installed (see the Memory control panel).
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ChemDraw Chem3D: I get the following error message during a MOPAC calculation: "Atom positioned using three co-linear atoms"
I get the following error message during a MOPAC calculation: "Atom positioned using three co-linear atoms"Solution:The error message indicates that you have a linear group of atoms in your molecul...
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ChemDraw Chem3D: I am trying to define a net charge of +1 on a molecule, but MOPAC does not seem to be recognizing the charge I have assigned in the Replacement Text Box.
I am trying to define a net charge of +1 on a molecule, but MOPAC does not seem to be recognizing the charge I have assigned in the Replacement Text Box.Solution:You must use the "Charge=" keyword....
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ChemDraw for Excel: I have a list of SMILES strings. How do I convert them to structures
I have a list of SMILES strings. How do I convert them to structures? Solution: Open your list of SMILES strings in ChemDraw for Excel. Highlight the column containing the SMILES strings, and the...
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ChemDraw for Excel: Instead of structures in my Excel spreadsheet, I see strange characters
Instead of structures in my Excel spreadsheet, I see strange characters.Solution:If you are on a non-US American Windows version of Windows, try opening the Regional Settings Control panel, and cha...
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Chem3D: How do I bring a model from Gaussian into Chem3D Pro and vice versa?
Details: Upgrade to the latest version of Chem3D Ultra (included in ChemOffice or Signals ChemDraw only). The latest version of Chem3D Ultra comes with a Gaussian client, which provides a direc...
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ChemDraw ChemFinder: How do I join two text strings using CAL
How do I join two text strings using CAL?Solution:To join text strings, you use the combination of SetVal and Append, like this: setval 1 "hello" append on setval 1 " there" msg $v1 [ shows "hello ...
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ChemDraw Chem3D: Certain formatted checkpoint files that are read into Chem3D Pro do not display the molecular orbitals
Certain formatted checkpoint files that are read into Chem3D Pro do not display the molecular orbitals. Some molecules seem to optimize and display their results with no problem, while others give ...