Group diagram

The symbols are given at the upper comer of the space group diagrams. A fraction h attached to a symbol indicates two symmetry planes with height h and h + 1/2 above the plane of projection e.g. 1/8 stands for h — 1/8 and 5/8. No fraction means h — 0 and 1/2. 

Figure 1.7. Some graphical symbols used for symmetry planes in space group diagrams.

Figure 1.8. Some graphicai symbois used for symmetry axes in space group diagrams.

Figure 1.9. Space group diagrams for the low-symmetry triclinic space group PI (top) and the high-symmetry cubic space group Pm 3m (bottom).

Hydrogen/CalcOH http //www.ccpl4.ac.uk/ccp/ccpl4/ftp-mirror/nardelli/pub/ nardelli/ and GUI version within WinGX Hypertext Book of Crystallographic Space Group Diagrams and Tables http // img.chem.ucl.ac.uk/sgp/... 

Figure 3.11 Space group diagrams for planar group pi (a) symmetry elements (b) equivalent general positions (c) position of a triangular molecule motif (d-f) specification of the coordinates (x, y) of an atom...

Table 5.7 Graphical symbols used in space group diagrams...

Figure 5.2 Space group diagrams for space group No 74, P4 (a) symmetry elements (b) positions of motif generated by symmetry operations (c) asymmetric unit...

The space group diagrams are given in the following figure... 

The directions of the principal axes are given with respect to the crystallographic axes. Li(N2D5)S04 is orthorhombic with space group Pna2i, with lattice positions [Space Group Diagrams and Tables, http //img. chem.ucl. ac. uk/sgp/mainmenu.htm] ... 

For compounds containing 0-2 d electrons it is more favorable to place the ligand in the yz plane, but on the axis which forms an angle with the z axis. This enables the interactions of the H ion with the la and Z 2 orbitals (for the 2 symmetry) which become the orbitals possessing a symmetry in the complex belonging to the group [diagram (9.7)]. 

---