Selective recognition of metal complexes by macrocyclic ethers: further observations on the macrocycle size dependence and the first-sphere ligand composition dependence of recognition thermodynamics

Lian Zhang Xiao Lian Zhang, Dong I. Yoon, Joseph T. Hupp*

*Corresponding author for this work

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Additional studies of solution phase recognition of Ru(NH3)x(pyridine)y2+, Ru(NH3)x(2,2′-bipyridine)y2+ and Ru(NH3)4(1,10-phenantroline)2+ species by dibenzo crown ethers are reported. The factors most closely examined were crown size, ammine ligand content and ancillary ligand composition. The overall study confirms that recognition or association derives primarily from H-bond formation (ammine hydrogen/ether oxygen. Evidently opposing these interactions, however, are crown conformational rearrangements. Consequently, straight-forward correlatins between association strength and potential number of H-bond interactions are found only in selected cases. Based on comparisons of association constants for (bis) pyridine, bipyridine and phenanthroline ligand-containing species with dibenzo crowns, evidence is also found for favorable polypyridine/benzene interactions. NMR (NOE) measurements indicate that the preferred association geometrics in solution are those that make each of the benzenes of the crown coplanar (or nearly coplanar) with the ligated polypyridine.

Original languageEnglish (US)
Pages (from-to)285-289
Number of pages5
JournalInorganica Chimica Acta
Volume240
Issue number1-2
DOIs
StatePublished - Dec 1995

Keywords

  • Ammine complexes
  • Macrocyclic ether complexes
  • Molecular recognition
  • Ruthenium comlexes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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