The First Red Azo Lake Pigment whose Structure is Characterized by Single Crystal Diffraction

4 February 2000

journal article
research article
Published by Wiley in Angewandte Chemie International Edition in English

Vol. 39 (3) , 638-640
https://doi.org/10.1002/(sici)1521-3773(20000204)39:3<638::aid-anie638>3.0.co;2-k

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.