Abstract

<h2>Acta Crystallographica Section B</h2><h3>Structural Crystallography and Crystal Chemistry</h3><h3>0567-7408</h3> <h2>short structural papers</h2> Volume 31 Part 3 Pages 916-918 March 1975 <h2>Tris(1,3-propanedionato)chromium(III)</h2> M. D. Glick, B. Andrelczyk and R. L. Lintvedt Acta Cryst. (1975). B31, 916 Tris-(1,3-propanedionato)chromium(III) BY MILTON D. GLICK, SR BERNICE ANDRELCZYK AND RICHARD L. LINTVEDT Department of Chemistry, Wayne State University, Detroit, Michigan 48202, U.S.A. (Received 9 November 1973; accepted 22 November 1974) Abstract. "Iris-(1,3-propanedio nato)chro mium(I I I), the simplest transition-metal 1,3-diketonate chelate, is monoclinic, P2/c, a= 10.803 (8), b = 8-121 (5), c-- 14.583 (9) A, fl-- 120-24 (3)°, Qca~c = 1"60 g cm-3, ~0meas= 1"58 g cm-a. The molecule has crystallographic symmetry 2 and idealiEed symmetry 32. Introduction. The chelates of 1,3-diketonates have been studied extensively for a variety of reasons. One reason for continuing interest in these systems is the ease with which the ring substituents may be varied, resulting in dramatic changes in the chelate's physical properties. Spectral transitions in the visible region, for example, are affected by the nature of the substituent groups. Spectral shifts brought about by substituent group changes are generally explained in terms of the groups' electronic effects. Although a large number of 1,3- diketonate chelate structures have