Beilstein J. Org. Chem.2019,15, 840–851, doi:10.3762/bjoc.15.81
5–8 display an isostructural series of compounds with bridging azobenzenecarboxylates in the trans form. The paramagnetic Ni complexes 2, 4 and 7 reveal a weak ferromagnetic exchange interaction with magnetic exchange coupling constant values between 21 and 23 cm−1 (H = −2JS1S2). Irradiation of 1
with λ = 365 nm reveals a photoisomerization of the co-ligand from the trans to the cis form.
Keywords: azobenzenecarboxylates; cadmium; complexes; macrocyclic ligands; nickel; zinc; Introduction
The macrocyclic N6S2 donor ligand H2L is an effective dinucleating ligand that supports a large number
redox potential [6].
The facile formation of such compounds and their unusual properties led us to synthesize derivatives bearing azobenzenecarboxylates as bridging co-ligands. A series of mixed-ligand complexes of the type [M2L(μ-L')]+, where M = Zn(II), Ni(II), or Cd(II), L' = p-azobenzene
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Graphical Abstract
Figure 1:
Left: Mixed ligand complexes of the type [M2L(μ-L')]n+ supported by the macrocyclic ligand H2L (M =...