Tetraazamacrocyclic Copper Complex Research Articles

Pseudorotaxane based on tetraazamacrocyclic copper complex and dibenzocrown ether

Host-guest interactions between two electron-rich dibenzocrown ethers and electron deficient macrocyclic copper(II) tetraimine complexes lead to the formation of pseudorotaxane in solution. The interactions are enhanced with the copper(III) complex compared to that of the copper(II) form as shown by the electrochemical studies. The larger--30-membered dibenzocrown donor interacted with the copper complex stronger than the smaller ones as revealed by NMR and electrochemical methods. The thiolated form of the copper(II) tetraimine complex was self-assembled at the gold electrode forming an electroactive monolayer able to interact with the crown ether in the solution. These donor-acceptor interactions lead to an increase of the barrier properties of the layer and decreased the electron transfer rate between the copper centre and the gold electrode surface as proved by the voltammetric data.

The Role of the C–H···π Interactions in the Cyclisation Reactions Leading to New Aryl‐Bridged Tetraazamacrocyclic Complexes of Copper and Nickel

AbstractA series of neutral macrocyclic transition metal complexes of CuII and NiII, with bridging polyether linkers joining them to aromatic fragments, has been synthesised and their crystal and molecular structures have been established by single‐crystal X‐ray diffraction. These molecules adopt an “equatorial” conformation of the bridge due to formation of C–H···π interactions. Because of these interactions only cyclic products are formed in the SN2 reaction. DFT calculations also confirm experimental results.

Polyazamacrocycles VIII. Polarographic behaviour of some tetraaza macrocyclic complexes of copper(II), nickel(II) and cobalt(III)

The polarographic reduction at a dropping mercury electrode of several CuII, NiII and CoIII complexes of tetraaza macrocycles has been studied in 0.1M NaClO4 as supporting electrolyte. The CuII complexes show values of half-wave potentials which can be correlated to the ring size and ligand field stabilisation. A similar, though less marked, trend is noticeable in the reduction of the NiII complexes. No such conclusions can be drawn in the case of the CoIII complexes.

Spectrochemical study of the electron transfer reaction in the tetraazamacrocyclic copper complex series

Spectrochemical study of the electron transfer reaction in the tetraazamacrocyclic copper complex series