Zinc carboxylate cluster formation in conjugated metallomacrocycles: evidence for templation.
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.
Frischmann
Peter D
PD
Department of Chemistry, University of British Columbia, Vancouver, BC, Canada.
Gallant
Amanda J
AJ
Chong
Jonathan H
JH
MacLachlan
Mark J
MJ
D002264:Carboxylic Acids / Q000737:chemistry*; D018360:Crystallography, X-Ray; D047028:Macrocyclic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods; D015032:Zinc / Q000737:chemistry*
D002264:Carboxylic Acids; D047028:Macrocyclic Compounds; D009942:Organometallic Compounds; D015032:Zinc