Synthesis and properties of tetraaza[14]tetraene and tetraaza[14]hexane macrocyclic complexes

First‐Row Transition Metal Bis(amidinate) Complexes; Planar Four‐Coordination of FeII Enforced by Sterically Demanding Aryl Substituents

“…[60,61] Examples include salen [salen = N,NЈ-ethylenebis(salicylideneimine)], [62] calix [4]arene, [63] porphyrins, [64,65] phthalocyanines [66][67][68][69] and a number of macrocyclic bis(β-diiminato) ligands. [70][71][72][73] Planar coordination of Fe II by two bidentate [a] For ease of comparison, the atoms of the Ni complex (5) have been labelled here in analogous fashion to that in the other complexes, in spite of its crystallographic C 2 symmetry (N1_a Ǟ N3, N2_a Ǟ N4, C1_a Ǟ C32 etc. ).…”

Electrocatalytic Determination of L-Ascorbic Acid by Modified Glassy Carbon with Ni(Me2(CH3CO)2[14]tetraenoN4) Complex

“…22 McElroy 27 has shown with a number of physical techniques that the first oxidation of Ni(L) (16π) process yields the π cation radical complex Ni(L·) + (15π). 28,29 The compound also exhibits a second oxidation, which presumably leads to the formation of an aromatic structure, Ni(L) 2+ (14πp).…”

Luminescence behavior of tetraaza macrocylic nickel (II) complexes and non-linear Stern–Volmer quenching

“…Even though a lot of reports are available on the synthesis [1,2] structural characterization [3][4][5], kinetic [6,7] and thermodynamic properties [8] of these systems, comparatively less work has been done on their photochemistry. The usefulness of macrocyclic Schiff-base ligands as effective porphyrin analogues has been well recognized and this analogy is more appropriate in the case of tetraazaannulene ring systems and many metallo derivatives of these ligands [9].…”