The first red azo lake pigment whose structure is characterized by single crystal diffraction

Kennedy, A.R. and McNair, C. and Smith, W.E. and Chisholm, G. and Teat, S.J. (2000) The first red azo lake pigment whose structure is characterized by single crystal diffraction. Angewandte Chemie, 39 (3). pp. 638-640. ISSN 0044-8249 (http://dx.doi.org/10.1002/(SICI)1521-3773(20000204...)

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Abstract

A model for red azo pigment Ca4B was characterized structurally using synchrotron radiation. This highly anisotropic ladder structure represents a new structural class in azo pigment chemistry. The picture shows that the calcium atoms coordinate in a complex manner to three azo ligands (one terdentate, one bidentate, and one monodentate) and two water molecules simultaneously.