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The space-group distribution of molecular organic structures
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, ch. 9.7, pp. 897-906 [ doi:10.1107/97809553602060000623 ]
... distribution of molecular organic structures is reviewed. Topics discussed include: a priori classifications of space groups; special positions of given symmetry ... space-group frequencies; the use of molecular symmetry; structural classes; a statistical model for space-group frequency; molecular packing; and a priori predictions of molecular crystal structures. 9.7.1. A priori ...

The hydrogen bond and the definition of the packing units
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.7.2, p. 906 [ doi:10.1107/97809553602060000623 ]
... not necessarily identical with the individual molecule. The molecule (of a shape defined by chemical bonds on the inside and van ... two hydrogen bonds and two regular O-H bonds create a point symmetry at each O atom, and a highly symmetrical structure emerges with an infinite bond network, ...
     [more results from section 9.7.7 in volume C]

A statistical model
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.6, p. 904 [ doi:10.1107/97809553602060000623 ]
A statistical model 9.7.6. A statistical model Wilson (1988, 1990, 1991) has discussed the factors ... class (see Chapter 1.4 ), the number of examples, Nsg, of a space-group type would depend exponentially on the numbers ...

Structural classes
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.5, p. 904 [ doi:10.1107/97809553602060000623 ]
... all molecules are the same. Nevertheless, they are important in a study of the space-group distribution of molecular organic structures ... by molecular symmetry. In its general form, the symbol of a structural class has the form where is the standard space ... those symmetries. An example will make this clearer. There is a structural class This indicates that the space group is ...

Positions with the full symmetry of the geometric class
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.4.4, pp. 903-904 [ doi:10.1107/97809553602060000623 ]
... of the geometric class The symmorphic space groups are in a one-to-one correspondence with the arithmetic crystal classes, and ... I4 1 None P4/n 1 P42/n 3 I41/a 12 P21c 17 I2d 1 I41/acd 1 4/m ... molecules of these symmetries in space groups of higher symmetry. A few are in fact to be found in non- ...
     [more results from section 9.7.4 in volume C]

Empirical space-group frequencies
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.3, p. 902 [ doi:10.1107/97809553602060000623 ]
... Allen et al., 1991) contains assignments of space groups for a variety of different types of organic compounds. The file can ... it is easy, for example, to trace all structures having a particular space group, or those having a particular space group and a particular number of formula ...

Special positions of given symmetry
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.2, pp. 900-902 [ doi:10.1107/97809553602060000623 ]
... Some typical recent papers are Brock & Dunitz (1994), Donohue (1985), Mighell, Himes & Rodgers (1983), Padmaya, Ramakumar & Viswamitra (1990), Wilson (1988, 1990 ... attention outside Russian-speaking areas. Recently, however, there has been a spate of interest (Wilson, 1991, 1993b,c,d; Brock & Dunitz ... fact that the Cambridge Structural Database (Section9.7.3) did not provide a search program that would distinguish between occupation of a ...

Relation to structural classes
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.1.4, p. 900 [ doi:10.1107/97809553602060000623 ]
... 1977, and papers cited there and below) are not an a priori classification of space groups but are a classification of structures within a space-group type in accordance with the number and ...
     [more results from section 9.7.1 in volume C]

A priori predictions of molecular crystal structures
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.8, p. 906 [ doi:10.1107/97809553602060000623 ]
A priori predictions of molecular crystal structures 9.7.8. A priori predictions of molecular crystal structures As physical properties of a molecular compound are a function of the spatial arrangement ...

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