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ChemOffice.Com - CambridgeSoft

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Administrator<br />

FORTRAN Formats<br />

The FORTRAN format for the records in a<br />

Cartesian coordinate file with a connection table by<br />

serial number or position and a Cartesian<br />

coordinate file with fractional crystal cell<br />

parameters are listed in the following tables:<br />

Cartesian coordinate File (Connection Table by<br />

Serial Number or Position):<br />

Line<br />

Number<br />

Description<br />

1 Number of<br />

Atoms<br />

FORTRAN<br />

Format<br />

I3<br />

specifications of the Cambridge Structural<br />

Database, Version 1 File Specifications from the<br />

Cambridge Crystallographic Data Centre. For<br />

further details about the FDAT format, please refer<br />

to the above publication or contact the Cambridge<br />

Crystallographic Data Centre.<br />

As described in the specifications of the Cambridge<br />

Crystal Data Bank format, bonds are automatically<br />

added between pairs of atoms whose distance is less<br />

than that of the sum of the covalent radii of the two<br />

atoms. The bond orders are guessed based on the<br />

ratio of the actual distance to the sum of the<br />

covalent radii. The bond orders, bond angles, and<br />

the atom symbols are used to determine the atom<br />

types of the atoms in the model.<br />

2 to End Atom<br />

coordinates<br />

A3, 1X, I4, 3(1X,<br />

F11.6), 1X, I4,<br />

10(1X, I4)<br />

Bond Type<br />

Actual Distance / Sum<br />

of Covalent Radii<br />

Cartesian coordinate File (Fractional Crystal Cell<br />

Parameters):<br />

Line<br />

Number<br />

Description<br />

1 Number of<br />

Atoms, Crystal<br />

Cell Parameters<br />

2 to End Atom<br />

coordinates<br />

FORTRAN<br />

Format<br />

I3, 6(1X, F), I<br />

A3, 1X, I4, 3(1X,<br />

F11.6), 1X, I4,<br />

10(1X,I4)<br />

Cambridge Crystal Data<br />

Bank Files<br />

The specific format of Cambridge Crystal Data<br />

Bank files (CCDB) used by Chem3D is the FDAT<br />

format, described on pages 26–42 of the data file<br />

Triple 0.81<br />

Double 0.87<br />

Delocalized 0.93<br />

Single 1.00<br />

Internal Coordinates File<br />

Internal coordinates files (INT Coords) are text<br />

files that describe a single molecule by the internal<br />

coordinates used to position each atom. The serial<br />

numbers are determined by the order of the atoms<br />

in the file. The first atom has a serial number of 1,<br />

the second is number 2, etc.<br />

624• File Formats <strong>CambridgeSoft</strong><br />

File Format Examples

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