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Updated: Aug 18, 2026

Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
Frequency of Z' values in organic and organometallic crystal structures
1Institut fur Chemie-Kristallographie, Freie Universitat Berlin, Takustrasse 6, D-14195 Berlin, Germany. steiner@chemie.fu-berlin.de
Abstract:
The frequencies of Z' values (formula units per asymmetric crystal unit) are documented for organic and organometallic crystal structures, using the Cambridge Structural Database. The absolute frequencies of all Z' values reported, relative frequencies for certain substance classes, the seven crystal systems and the most abundant space groups are given. The three Z' values 1/2, 1 and 2 make up 95.3% of all crystal structures. Structures with Z' > 1 occur most frequently with nucleosides and nucleotides (20.8%), and with steroids (18.8%).
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