The coordination chemistry of optically active ligands. Copper(II) and nickel(II) compounds containing (S)-(+)-1-amino-2-propanol as a ligand

✍ Scribed by G. Nieuwpoort; J. Reedijk

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 548 KB
• Volume: 100
• Category: Article
• ISSN: 0165-0513
• DOI: 10.1002/recl.19811001008

✦ Synopsis

Abstract

Copper(II) and nickel(II) compounds with (S)‐(+)‐1‐amino‐2‐propanol (S‐ap) are described and compared with the corresponding compounds containing racemic 1‐amino‐2‐propanol ((RS)‐ap) previously reported. Both ligands give analogous coordination compounds, except in the case of the chlorides of formula MCl~2~(ap)~2~, which are only obtained with (RS)‐ap. Similar differences were found in solution using conductometric titrations. Infrared and ligand field spectra for the racemic and optically active compounds are almost identical. Circular dichroism spectra show that Λ(δδδ) is the most stable configuration for the tris‐chelates. For the bis‐compounds the ligands could be assigned to cis‐ or trans‐positions by comparing the rotational strength of the d‐d transitions. In addition, the different melting points of the isomers are related to their different geometries. The comparison further indicates that in compounds with monodentate coordinating ap ligands steric hindrance is less important in the case of the compounds containing S‐ap.