Transition and post-transition metal ion chemistry of dibenzo-substituted, mixed-donor macrocycles incorporating five donor atoms

Synthesis and structural characterization of new N2O2-donor Schiff base macrocycles and their silver(I) coordination polymers

“…In addition, the unusual stability of macrocyclic complexes, known as the macrocyclic effect, is one of the major features of these compounds. This feature validates application of macrocycles as sensing agents [3] and selective separating agents [4]. However, for this type of applications, due to the nature of the macrocyclic ligands, endo-coordinated macrocyclic complexes (metal ion is bonded inside macrocyclic cavity) are almost exclusively investigated.…”

“…Until now, the ii strategy was less common and there have been only a few known examples of such compounds. Most of the investigations are dedicated to thioether macrocycles that are suitable for coordination of soft metals [4,12,13]. http Herein, we report the synthesis of two N 2 O 2 -donor Schiff base macrocyclic ligands (Scheme 1) and their silver coordination polymers.…”

Properties of Metal Complexes of a New Dioxadiaza Macrocycle Containing a Dibenzofuran Unit and Acetate Pendant Arms

“…The stability constants of the complexes of ac 2 [17] The stability constants of the metal complexes of ac 2 [17](DBF)-N 2 O 2 are significantly higher than those of the parent macrocycle due to the coordination of the acetate pendant arms (see Table 2). However, identical to [17] [ 16] [e] T = (298.2 Ϯ 0.1) K; I = (0.10 Ϯ 0.01) mol dm -3 in aqueous NMe 4 NO 3 .…”

“…In this regard, macrocyclic ligands have been extensively studied. [2][3][4][5][6] Indeed, the macrocyclic framework can be adjusted by changing the number, nature and location of donor atoms, the cavity size and conformational flexibility, allowing the design of highly preorganized ligands with the ability to recognize and selectively bind certain metal ions. In particular, aza crown [ for cadmium.…”

Hierarchical assembly of discrete copper(ii) metallo-structures from pre-assembled dinuclear (bis-β-diketonato)metallocycles and flexible difunctional co-ligands

“…26 Further, the use of such non-planar co-ligands incorporating different donors (namely, secondary versus tertiary amines versus thioethers) also gives the potential for 'tuning' the coordination geometry adopted by the metal 27 and hence influence the outcome of the self-assembly process.…”