Bis{tris[2-(2-oxidobenzylideneazaniumyl)ethyl]amine-κ³O,O′,O′′}calcium bis(perchlorate) acetonitrile disolvate

Abstract

Key indicators: single-crystal X-ray study; T = 150 K; mean (C-C) = 0.002 Å; R factor = 0.039; wR factor = 0.110; data-to-parameter ratio = 17.4.The title complex, [Ca(C 27 Related literatureFor crystal structure of the free ligand, see: Gü ndü z et al. (1985). For structures of transition metal complexes of H 3 saltren, see: Steinhauser et al. (2004); Elerman et al. (1994 Elerman et al. ( , 1995. ExperimentalCrystal data

Planar-Chiral Metal Complexes Comprised of Square-Planar Metal and Achiral Tetradentate Ligands: Design, Optical Resolution, and Thermodynamics

“…A linear dianion derived from H 2 L 4 has nonionic pyridyl groups at both ends, while that from H 2 L 5 has anionic pyrrolato groups at both ends. A dianionic, linear compound having four metal-binding [N 2 O 2 ] sites was recently reported to play a role as not a tetradentate but a bidentate ligand to adopt a metal complex, in which the two anionic O atoms at both ends of the ligand strand were coordinated to the metal while the two nonionic N atoms (imine units), being in the middle of the ligand, were nonconnected . On the basis of these results, the racemization mechanisms of the planar-chiral metal complexes were proposed, as shown in Scheme .…”