Structural properties of Cyclopentanone-bridged Bis-Macrocyclic Ligand Dicopper(II) complexes in the solid and in solution

• Verfasst von: Comba, Peter [VerfasserIn]
• Verfasst von: Kerscher, Marion [VerfasserIn]
• Titel: Structural properties of Cyclopentanone-bridged Bis-Macrocyclic Ligand Dicopper(II) complexes in the solid and in solution
• Titelzusatz: a successful test of the MM-EPR method
• Verf.angabe: Peter Comba, Marion Kerscher, Yaroslaw D. Lampeka, Lutz Lötzbeyer, Hans Pritzkow, and Lyudmyla V. Tsymbal
• E-Jahr: 2003
• Jahr: 05/08/2003
• Umfang: 3 S.
• Fussnoten: Gesehen am 21.02.2018
• Titel Quelle: Enthalten in: Inorganic chemistry
• Ort Quelle: Washington, DC : American Chemical Society, 1962
• Band/Heft Quelle: 42(2003), 11, Seite 3387-3389
• ISSN Quelle: 1520-510X
• DOI: doi:10.1021/ic026265r
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1570075972

Abstract

The copper(II)-assisted condensation of 2,3,2-tet (3,7-diazanonane-1,9-diamine) with formaldehyde and cyclopentanone yields the mono- and bis-macrocyclic Mannich condensation products L1 and L2, as well as the Schiff-base product L3, all with cyclam-type tetraaza macrocycles, coordinated to copper(II). The combination of molecular mechanics and EPR spectroscopy (MM-EPR) reveals that all three isomers of [Cu2(L2)(OH2)n]2+ (n = 0−4), with the expected trans-III (R,R,S,S) configuration of the 14-membered tetraaza macrocycles, are of similar stability, and that the isomer whose structure is solved by X-ray crystallography has a different structure in solution.