No abstract

The sterically hindered carboxylate ligand 2,6‐bis(2,2‐dimethylpropionylamino)benzoic acid (HL) has been prepared. The two intramolecular hydrogen bonds in HL are exploited to restrict the corresponding carboxylate anion (L−) to nonbridging coordination and to preorganise its sterically bulky substituents proximal to the first and second coordination sphere of the bound metal ion. The crystal structures of the ligand anion as the ammonium salt [NH4][L] and the distorted octahedral calcium complex CaL2(H2O)2, in which L− binds to the calcium(2+) ion in a monodentate, nonbridging mode, are described. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)

Key indicatorsSingle-crystal X-ray study T = 150 K Mean '(C±C) = 0.002 A Ê Disorder in main residue R factor = 0.047 wR factor = 0.141 Data-to-parameter ratio = 26.4For details of how these key indicators were automatically derived from the article, see