Zinc Carboxylate Cluster Formation in Conjugated Metallomacrocycles: Evidence for Templation
摘要:
A new [3 + 3] Schiff base macrocycle incorporating three N2O2 salphen-type binding sites and peripheral neopentyloxy substituents has been prepared. The incorporation of Zn2+ ions into this and related conjugated Schiff base macrocycles has been studied by NMR spectroscopy, mass spectrometry, and X-ray diffraction. When reacted with 7 equiv of zinc acetate, the macrocycles template the formation of heptanuclear complexes. Two tetranuclear Zn2+ complexes that are plausible intermediates in the assembly of the heptanuclear complexes have been isolated and structurally characterized. These reactive intermediates are promising substrates for the synthesis of polynuclear, mixed-metal clusters. We also demonstrate that this chemistry may be generalized to other bridging carboxylate ligands, such as methacrylate.
Capsule formation in novel cadmium cluster metallocavitands
作者:Peter D. Frischmann、Mark J. MacLachlan
DOI:10.1039/b710809e
日期:——
We report the synthesis and characterization of a new heptanuclear cadmium cluster complex formed within a Schiff basemacrocycle and study its surprising dimerization in the solid-state and solution to form capsules.
Heptametallic Bowl-Shaped Complexes Derived from Conjugated Schiff-Base Macrocycles: Synthesis, Characterization, and X-ray Crystal Structures
作者:Amanda J. Gallant、Jonathan H. Chong、Mark J. MacLachlan
DOI:10.1021/ic060352s
日期:2006.7.1
The reaction of chelating conjugated macrocycles 1a-c with Zn(OAc)2 gives bowl-shaped heptanuclear Zn complexes featuring Zn in tetrahedral, octahedral, and square-pyramidal geometries. Crystallographic and NMR results indicate that vacant Zn coordination sites within the bowl may be accessed, suggesting that these coordination complexes may be used as mimics for Zn fingers and carbonic anhydrase.