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Ligand modifications for tailoring the binuclear microenvironments in schiff-base calixpyrrole pacman complexes

Askarizadeh, E ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1021/ic900871g
  3. Publisher: 2009
  4. Abstract:
  5. The synthesis and structures of two new octadentate, Schiff-base calixpyrrole macrocycles are presented in which modifications at the meso-substituents (L1) or the aryl spacer between the two pyrrole-imine donor compartments (L2) are introduced. The outcomes of these changes are highlighted in the structures of binuclear Pacman complexes of these macrocycles, [M2(L1)] and [M2(L 2)]. Both palladium and cobalt complexes of the fluorenylmeso- substituted macrocycle H4L1 adopt rigid, but laterally twisted geometries with enclosed bimetallic microenvironments; a consequence of this spatial constraint is an exo-exo-bonding mode of pyridine in the dicobalt complex [Co2(py)2(L1)]. In contrast, the use of an anthracenyl backbone between the two donor compartments (H4L 2) generates a binuclear palladium complex in which the two PdN 4 environments are approximately cofacial and separated by 5.3 å, so generating a bimetallic complex that is structurally very similar to binuclear compounds of cofacial diporphyrins. © 2009 American Chemical Society
  6. Keywords:
  7. Ligand ; Organometallic compound ; Pyrrole derivative ; Schiff base ; Chemical structure ; Chemistry ; Synthesis ; X ray crystallography ; Crystallography, X-Ray ; Ligands ; Models, molecular ; Molecular structure ; Organometallic compounds ; Pyrroles ; Schiff bases
  8. Source: Inorganic Chemistry ; Volume 48, Issue 15 , 2009 , Pages 7491-7500 ; 00201669 (ISSN)
  9. URL: https://pubs.acs.org/doi/abs/10.1021/ic900871g