Synthesis of homo- and heterobimetallic Ni II –M II (M = Fe, Co, Ni, Zn) complexes based on an unsymmetric ligand framework: Structures, spectroscopic features, and redox properties

An Unsymmetric Ligand Framework for Noncoupled Homo- and Heterobimetallic Complexes

We introduce a new unsymmetric ligand, PDIpCy (PDI = pyridyldiimine; Cy = cyclam), that offers two distinct, noncoupled coordination sites. A series of homo- and heterobimetallic complexes, [Zn₂(PDIpCy)(THF)(OTf)₄] (1; THF = tetrahydrofuran and OTf = triflate), [Ni₂(PDIpCy)(THF)(OTf)₂](OTf)₂ (2), and [NiZn(PDIpCy)(THF)(OTf)₄] (3), are described. The one-electron-reduced compounds, [Zn₂(PDIpCy)(OTF)₃] (4), [Ni₂(PDIpCy)(OTf)](OTf)₂ (5), and [NiZn(PDIpCy)(OTf)₃] (6), were isolated, and their electronic structures were characterized. The reduced compounds are charge-separated species, with electron storage at either the PDI ligand (4) or at the PDI-bound metal ion (5 and 6).

Facile high-yield synthesis of unsymmetric end-off compartmental double Schiff-base ligands: easy access to mononuclear precursor and unsymmetric dinuclear complexes

Novel approach to unsymmetric end-off compartmental ligands with a selective high-yield synthesis and access to unsymmetric dinuclear complexes.