Structural and chiroptical properties of acyclic and macrocyclic 1,5-bis(oxazoline) ligands and their copper(I) and silver(I) complexes

M. Hollósi, Zs. Majer, E. Vass, Zlata Raza, Vladislav Tomišić, Tomislav Portada, Ivo Piantanida, Mladen Žinić, Vitomir Šunjić

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Abstract

C2-symmetric acyclic Ligands 1a-1e, macrocyclic ligands 2a-2d and 3, and their copper(I) and silver(I) complexes were studied by UV, NMR and CD spectroscopy. The stability constants of the metal-1a and -1b complexes with 1:1 and 1:2 stoichiometries in acetonitrile were determined by spectrometric titrations. Evidence of tetrahedral coordination for complex [Ag(1a)2]+ was obtained from the complexation induced shifts (CIS) and NOEs, and corroborated by molecular modeling. Ligands with phenyl rings on the stereogenic centers (1a,c and 2) exhibit a strong Cotton effect (CE) in the region of the 1Bb band, which is absent in the ligands with benzyl groups on the stereogenic center (1b, 3). This effect is ascribed to the exciton coupling (EC) of two aromatic chromophores on the stereogenic center. For ligands la and 2a the EC changes the sign on complexation to Cu+, revealing opposite helicity of the free and complexed ligand.

Original languageEnglish
Pages (from-to)1738-1748
Number of pages11
JournalEuropean Journal of Inorganic Chemistry
Issue number7
Publication statusPublished - 2002

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Silver
Copper
Ligands
Complexation
Molecular modeling
Coordination Complexes
Chromophores
Titration
Stoichiometry
Cotton
Metals
Nuclear magnetic resonance
Spectroscopy

Keywords

  • Bis(oxazoline) ligands
  • Circular dichroism
  • Conformation analysis
  • Copper
  • Macrocyclic ligands
  • Silver

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Structural and chiroptical properties of acyclic and macrocyclic 1,5-bis(oxazoline) ligands and their copper(I) and silver(I) complexes. / Hollósi, M.; Majer, Zs.; Vass, E.; Raza, Zlata; Tomišić, Vladislav; Portada, Tomislav; Piantanida, Ivo; Žinić, Mladen; Šunjić, Vitomir.

In: European Journal of Inorganic Chemistry, No. 7, 2002, p. 1738-1748.

Research output: Contribution to journalArticle

Hollósi, M. ; Majer, Zs. ; Vass, E. ; Raza, Zlata ; Tomišić, Vladislav ; Portada, Tomislav ; Piantanida, Ivo ; Žinić, Mladen ; Šunjić, Vitomir. / Structural and chiroptical properties of acyclic and macrocyclic 1,5-bis(oxazoline) ligands and their copper(I) and silver(I) complexes. In: European Journal of Inorganic Chemistry. 2002 ; No. 7. pp. 1738-1748.
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AU - Majer, Zs.

AU - Vass, E.

AU - Raza, Zlata

AU - Tomišić, Vladislav

AU - Portada, Tomislav

AU - Piantanida, Ivo

AU - Žinić, Mladen

AU - Šunjić, Vitomir

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AB - C2-symmetric acyclic Ligands 1a-1e, macrocyclic ligands 2a-2d and 3, and their copper(I) and silver(I) complexes were studied by UV, NMR and CD spectroscopy. The stability constants of the metal-1a and -1b complexes with 1:1 and 1:2 stoichiometries in acetonitrile were determined by spectrometric titrations. Evidence of tetrahedral coordination for complex [Ag(1a)2]+ was obtained from the complexation induced shifts (CIS) and NOEs, and corroborated by molecular modeling. Ligands with phenyl rings on the stereogenic centers (1a,c and 2) exhibit a strong Cotton effect (CE) in the region of the 1Bb band, which is absent in the ligands with benzyl groups on the stereogenic center (1b, 3). This effect is ascribed to the exciton coupling (EC) of two aromatic chromophores on the stereogenic center. For ligands la and 2a the EC changes the sign on complexation to Cu+, revealing opposite helicity of the free and complexed ligand.

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