1. Dragging/rotating molecular fragments for building a Zn-porphyrin:
The following video illustrates the process shown on the picture above:
2. Building a complicated porphyrin derivative in Chemcraft:
3. Obtaining a Z-matrix of Cs2TeO3 molecule using Chemcraft:
4. The molecule can be constructed from fragments via "Unite two groups" or "Add fragment" menu items:
5. Example of quick obtaining of such picture:
In this video there are also some examples of modifying geometrical parameters. For "fully" 2d pictures the View/Isometry menu item can be used.
6. Dummy atoms can be inserted into the center of coordinates of selected atoms:
7. The use of Clipboard to copy molecular fragments from different files into one common structure:
8. "Monodentate" (linearly-bonded) ligands are easy to work with, but "bidentate" ones require some more work. Example of building such a molecule:
9. Chemcraft provides a "Structures combiner" utility, which allows one to quickly obtain molecular structures if he has already computed the structures of close homologues:
More detailed illustration of this feature can be seen here.
10. In Coord mode, the atomic coordinates can be exported in different formats, either in Angstroms or Bohrs. They can be saved in different formats (xmol, .sdf, .mfj, .tnk, .mdl, etc) via the File menu as well.
11. Use double-clicks and double right-clicks on atoms and bonds to alter their types and captions:
12. When a spectrum with band broadening is built, the button "Export values" allows the user to export this graph in ASCII format (e.g,. into Excel or Origin). The button "Interpolation coordinates" allows one to specify the X coordinates of the broadened spectrum.
13. The archive of molecular fragments can be supplemented with custom fragments:
14. When working with cube files, they can be combined, different operations with them can be performed (sum, multiplication, etc), isosurface of one cube can be colored by another cube:
15. Crystallographers can find the Fragments Extractor useful:
16. Multiple atoms can be selected in different ways, in particular with these buttons:
17. Chemcraft can draw 3-dimensional pictures, which look like 2-dimensional images drawn in Chemdraw:
18. Two or more structures can be "merged" via "Tools/Structures comparer/merge..." menu item (this option can be used, for example, to compare crystallographic and ab initio structures):
19. Often, when an output file with geometry optimization is browsed, the molecular orientation switches several times within optimization steps. To avoid this problem, use the "Tools/Set common orientation" menu item (at the left window, after clicking on the "Optimization" node):
20. Menu item "View/Release all captions" allows the user to get the picture with several captions on each atom:
21. Chemcraft can quickly generate animated gif files from an arbitrary set of bmp or jpg files, so you can use Chemcraft to obtain any animations (not necessarily related to chemistry).
22. Chemcraft provides a Structures Comparer tool, which compares the structures from two opened files; this tool can help avoid mistakes when the input files are muddled up (for example, if you have interrupted geometry optimization, you should insert the last geometry from the output file into new input file, and then the possibility to check whether these structures are equal can be useful):
23. When .cif files are visualized, the distance cutoff can be increased, so there will be no overlapping atoms (with distance less than 0.5 A). Use the "Crystallography tools/Increase the distance cutoff..." menu item at left-bottom:
24. Chemcraft allows the user to add custom vectors, planes to the image (with custom XYZ coordinates), see example:
25. If you have performed a geometry optimization, and want to know whether the optimized structure is a minimum or a saddle point (and the frequency computation is too expensive), you can use the possibility to lower the molecular symmetry:
26. When working with NMR computations, it is often useful to obtain a table of chemical shifts, averaged within specified groups of atoms. These values usually correlate well with the experimental chemical shifts, and in our work we found this option much more useful than drawing an NMR spectrum. This option is shown via "Tools/Show atomic properties table option" (the "Tools" button is shown at the left bottom corner of Chemcraft window):
27. For geometry optimization jobs, Chemcraft can draw the graph "Step N vs Proximity to symmetry point group". This feature can be useful if you want to check, whether your structure is symmetrical (if you don't have the analytical frequencies):
28. When a spectrum with broadened bands is built in Chemcraft, the values at each point can be exported into Origin or Excel via Clipboard. This option can be used for multiple purposes (for example, for building several spectra at one picture):
29. When a vibrational spectrum is shown, Chemcraft can color individual bands in the spectrum according to the colors of atoms mostly involved in the mode displacements:
In this display scheme the hydrogen atoms have blue colors, so the frequencies in which the hydrogens are involved mostly are colored blue in the spectrum.
30. Chemcraft can quickly find the vibrational modes in which the selected atoms are involved mostly (("Tools/Find frequencies..." at the left panel).
31. A tool for quick calculation of energies of reactions is provided:
32. If you have two molecules with close structure and different sequences of atoms, Chemcraft can automatically reorder the atoms in one of these structures to make them equal ("Tools/Structures comparer/Update atomic sequence for best match with the structure from another Chemcraft window" menu item):
33. Multiple Gaussian input files can be quickly modified via "Tools/Scripts/Modify multiple Gaussian input files" menu item (common route section can be set for each of them).
This utility also includes the following option: if a set of Gaussian input file is specified, it finds an output file for each of the input file in same folder, then takes the optimized geometry from the output file and then inserts in into corresponding input file:
34. The images can be exported in metafile (.wmf) format, in which each label and line is stored as an individual object, via Clipboard, and inserted into Word for following edit of labels and lines:
35. Chemcraft can extract data (coordinates) from pictures of spectrums and graphs taken from old papers. This utility can be used, if in a paper some important data (e.g. peak intensities) was not shown in text format, but it can be recalculated from a graph:
36. 3d graphs of relaxed PES scan jobs with 2 scanned parameters can be drawn:
Note that Chemcraft can build a 3d graph by a custom set of data (imported with Clipboard) via "Tools/Simple utilities/Create custom 3d graph".
37. Chemcraft can calculate the angle and distance between two planes or vectors described by groups of selected atoms:
38. Chemcraft can export cubes of molecular obitals in text format in the form of columns, for making operations with them in Excel/Origin. For example, with TDDFT data, most often the starting and final orbitals of a predicted excitation are not pure but rather are expressed as a linear combinations of the output of the TDDFT calculation; and Chemcraft allows one to export each orbital as a column into Excel, compute the linear combination of the orbitals and then import it back into Chemcraft for visualization:
See also: Chemcraft hints