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Appendix F: File Formats<br />

Editing File Format<br />

Atom Types<br />

Some file formats contain information describing<br />

the atom types that the file format understands.<br />

Typically, these atom types are ordered by some set<br />

of numbers, similar to the atom type numbers used<br />

in the Atom Types table. If the file format needs to<br />

support additional types of atoms, you can supply<br />

those types by editing the file format atom types.<br />

Chem3D 9.0 uses XML tables for storing file<br />

formats. You can edit these tables in any text editor<br />

or in Chem3D by selecting the table you want to<br />

edit from the Parameter Tables list on the<br />

View menu.<br />

TIP: The .xml files are in the path<br />

...\Chem3D\C3D Items\<br />

Name<br />

Each atom type is described by a name. This name<br />

is a number found in files of the format described<br />

by the file format. All names must be unique. The<br />

records in the table window are sorted by name.<br />

NOTE: While names are similar to atom type numbers,<br />

they do not have to correspond to the atom type numbers of<br />

atom types. In some cases, however, they do correspond.<br />

Description<br />

The second field contains a description of the atom<br />

type, such as C Alkane. This description is included<br />

for your reference only.<br />

The remaining fields (Symbol, Charge, Maximum<br />

Ring Size, Rectification type, Geometry, Number<br />

of Double Bonds, Number of Triple Bonds,<br />

Number of Delocalized Bonds, Bound to Order<br />

and Bound to Type) contain information<br />

corresponding to the information in an Atom<br />

Types table.<br />

File Format Examples<br />

The following sections provide examples of the<br />

files created when you save Chem3D files using the<br />

provided file formats.<br />

Alchemy File<br />

The following is a sample Alchemy file 1 (Alchemy)<br />

created using Chem3D for a model of<br />

cyclohexanol. The numbers in the first column are<br />

line numbers that are added for reference only.<br />

1 19<br />

ATOMS<br />

19<br />

BONDS<br />

2 1 C3 -1.1236 -0.177 0.059<br />

3 2 C3 -0.26 -0.856 -1.0224<br />

4 3 C3 1.01 -0.0491 -1.3267<br />

5 4 C3 1.838 0.1626 -0.0526<br />

6 5 C3 0.9934 0.8543 1.0252<br />

7 6 C3 -0.2815 0.0527 1.3275<br />

8 7 O3 -2.1621 -1.0585 0.3907<br />

9 8 H -1.4448 0.8185 -0.3338<br />

10 9 H -0.8497 -0.979 -1.9623<br />

11 10 H 0.0275 -1.8784 -0.6806<br />

12 11 H 1.6239 -0.5794 -2.0941<br />

13 12 H 0.729 0.9408 -1.7589<br />

1. Alchemy III is a registered trademark<br />

of Tripos Associates, Inc.<br />

Appendices<br />

<strong>ChemOffice</strong> 2005/Appendix File Formats • 619<br />

Editing File Format Atom Types

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