Collapsed Cu(II)-hydroxamate metallacrowns.

@article{Golenya2012CollapsedCM,
  title={Collapsed Cu(II)-hydroxamate metallacrowns.},
  author={Irina A. Golenya and Elżbieta Gumienna-Kontecka and Alexander N. Boyko and Matti Haukka and Igor O. Fritsky},
  journal={Inorganic chemistry},
  year={2012},
  volume={51 11},
  pages={
          6221-7
        }
}
Degradation of a strained, thermodynamically destabilized pentanuclear copper(II) 12-metallacrown-4 complex based on a picoline hydroxamic acid resulted in the formation of the tetranuclear compounds which are the first examples of solely hydroxamate-based Cu(II) metallacrown complexes with a collapse of the metallamacrocyclic cavity. 

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