Synthese und Struktur vier‐ und achtkerniger Chelatkomplexe – exohedraler Gastaustausch an Tetrahemispheraplexen

Inter-conversion of 15-MC-5 to 12-MC-4 manganese metallacrowns: structure and bioactivity of metallacrowns hosting carboxylato complexes

“…The cavity size of metallacrowns compares well to that of organic crown ethers. [14], [15][16][17] inverse- [18,19], [20][21][22][23], [24], [25], [26], [24], [27] metallacrowns with Mn III , Fe III , Ni II , Cu II and V V O, metal ions, stacking metallacrowns [28][29][30] as well as a variety of dimers and fused metallacrowns [16,20,31,32] have been reported to date. Metallacrowns are typically prepared using hydroxamic acids and/or ketonoximic acids as constructing ligands (Scheme 1), while suitable organic molecules such as picoline-tetrazolylamides [33], diethyl ketipinate [30], 3-hydroxy-2pyridone [34] or 3-thione-1,2-dithione-4,5-dithiolato [35] have also been used.…”

Supramolekulare Koordinationschemie – Synergie von Zufallsentdeckung und rationalem Design

“…Diese reagieren mit Cadmium‐, Mangan‐ oder Calciumdichlorid in der Gegenwart von wässrigem Ammoniak zu den achtkernigen [2×2]⊂[2×2]‐Gittern [Cd 8 (L 1−5 ) 8 ] ( 11 ), [Mn 8 (L 1−5 ) 8 ] ( 12 ) oder [Ca 8 (L 1 ) 8 ] ( 13 ) (Schema ) 6b. 8, 9 Die 1 H‐ und 13 C‐NMR‐Spektren des diamagnetischen Cadmiumgitters 11 weisen auf zwei Sätze identischer Liganden hin, von denen sich jede Hälfte in einer unterschiedlichen magnetischen Umgebung befindet. In 12 a bilden acht Mangan(II)‐Ionen die Ecken zweier Quadrate unterschiedlicher Größe, aber mit demselben Zentrum (Abbildung 7).…”

Synthesis, crystal structure and bioactivity of a novel 18-metallacrown-6 [Mn6(H2O)6 (anshz)6]·10DMF

“…One, two or three dimensions of networks of metallacrown could be connected via facial interactions and anion bridging [6]. To this day, metallacrowns, with Mn(III), Fe(III), Ni(II), Cu(II), Zn(II), Ga(III) and V(V)O metal ions, [7], [8][9][10][11][12], [13][14][15][16], [17], [18], [19], ] [17], [20], stacking metallacrowns [21][22][23] as well as a variety of dimers and fused metallacrowns [9,13,24,25] have been reported. Metallacrowns are typically prepared using hydroxamic acids and/or ketonoximic acids as constructing ligands (Scheme 1(a)), while suitable organic molecules such as salicylhydrazides [19,20,26], picoline-tetrazolylamides [27], diethyl ketipinate [23], 3-hydroxy-2-pyridone [28] or 3-thione-1,2-dithione-4,5-dithiolato [29] have also been used.…”