ChemInform Abstract: DINUCLEAR COPPER(II) CRYPTATES OF MACROCYCLIC LIGANDS: SYNTHESIS, CRYSTAL STRUCTURE, AND MAGNETIC PROPERTIES. MECHANISM OF THE EXCHANGE INTERACTION THROUGH BRIDGING AZIDO LIGANDS

Abstract

Die makrocyclischen Cu(II)‐Komplexe (I) und (II) werden durch die Umsetzung von Cu(II)‐perchlorathexahydrat mit den Makrocyclen in Methanol und nachfolgender Metathesereaktionen der entstehenden Perchlorate mit Na‐azid dargestellt (keine Ausb.‐Angaben).

Inversion of spin levels in exchange-coupled pairs under combined time reversal

“…It occurs, for example, in the Cu 2+ -Cu 2+ dimer with J = +4.8 cm -1 in the homonuclear complex having a bridging β-diketimineamid unit [24]. It was also found in [25] a rare case of ferromagnetic exchange interaction in homonuclear Cu 2+ -Cu 2+ dimers. In the tetraazido dinuclear Cu(II) complex of the polyaza-polyoxa macrocyclic ligand [24]ane-N 2 O 6 , which crystallizes in the monoclinic system with the spatial group P2 1 /n (a = 1.7780(2) nm, b = 0.9719(1) nm, c = 1.7361(2) nm, β = 109.32(5)°, Z = 4), two Cu(II) centers are doubly bridged by two azide ions bound end-on, and each Cu(II) displays octahedral coordination with four ecuatorial nitrogens and two azial oxygens (the Cu-Cu distance is 0.3162 nm).…”