Space-group frequency 207 symmetry

The CSD has been used to classify the occurrence and connectivity of crystal hydrates43 44 (Section 8.6.3), symmetry and space group frequency (as in the sub-database CSDSymmetry), 45 frequencies of low symmetry packing where there is more then one molecule in the asymmetric unit (Section 8.7)46 and the occurrence of polymorphism (Section 8.5),47 CSD-based tables for bond length distributions for organic and coordination compounds have been derived48 49 and efforts are currently underway to develop an automated library of such parameters called Mogul.50... 

One of the attractions of supramolecular chemistry is the extraordinary potential for synthesis of new materials that can be achieved much more rapidly and more effectively than with conventional covalent means. For supramolecular synthesis to advance, it is obviously important to characterize, classify, and analyze structural patterns, space group frequencies, and symmetry operators [118], However, at the same time we also need to bring together this information with the explicit aim of improving and developing supramolecular synthesis - the deliberate combination of different discrete molecular building blocks within periodic crystalline materials. 

The IR and Raman frequencies for the alkali tetrathiomolybdates and -tungstates (156) follow in Table 21. All these compounds crystallize in the jS-K2S04 lattice, space group D2 with Z = 4 having anionic site symmetry C (757). The number... 

From the symmetry analysis we know that in the R3>c space group only five modes are active in RS (Alg + 4 g). The experiment on LaA103 [1] clearly shows four Raman active modes and one that has a very low frequency of 33 cm-1 was also observed [9]. Comparing the RS of rhombohedral LaMn03 one should note the strong distinction to RS of LaA103. The main difference is the appearance of a new... 

Space group Symmetry elements (in addition to identity) Relative frequency of occurrence in the CSD (%) ... 

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