Niggli, Paul

Werner apparently did not realize that the polynuclear complexes which he investigated so extensively95 constituted a transition between the usual mononuclear coordination compounds and the infinite structure of the crystal lattice. It remained for Paul Pfeiffer, Paul Niggli (1888—1953) and others to point out that crystal structures were in beautiful agreement with his coordination theory, as revealed by the then new experimental technique of X-ray diffraction.96... 

Maeder, Paul, Andreas Fliessbach, David Dubois, Lucie Gunst, Padruot Fried, and Urs Niggli. 2002. Soil fertility and biodiversity in organic farming. Science 296 (May 31) 1694-1697. 

W. H. and W. L. Bragg were the first to show that the models proposed by Barlow for simple compounds, such as NaCl, CsCl. and ZnS are in agreement with the scattered X-ray intensities, Paul Niggli found that space groups could be determined by X-ray methods via the systematic extinction laws. 

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