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Macrocycles of Axially Chiral and Racemic N-Heterocyclic Carbene Silver(I), Gold(I) and Palladium(II) Complexes: Synthesis, Characterization and Computational Structures


Affiliations
1 Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
 

In this study, Ag(I), Au(I) and Pd(II) bis-N-hetero-cyclic carbene (NHC) complexes derived from axially chiral R-1,1′-binaphthyl-2,2′-diol (R-BINOL) and racemic biphenyl-2,2′-diol scaffolds have been synthe-sized. The metallation of these bis-imidazolium and bis-triazolium types of ligand precursors of R-BINOL and biphenol unit, viz. (1–4)d has been achieved using standard procedure. The {[L(L′-NHC)2]Ag}Cl-type, chiral (1–2)e and racemic (3–4)e complexes have been obtained by the treatment of ligand with Ag2O. Similarly, chiral Pd(II) (1f) and Au(I) (1g) complexes have been synthesized and analysed using spectroscopic techniques. The geometry-optimized structures obtained through the density functional theory display good proximity with the reported X-ray structures of similar type of Ag(I), AAu(I) and Pd(II) complexes.

Keywords

Axial Chirality, Density Functional Theory, Ligands, Racemic Complex.
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  • Macrocycles of Axially Chiral and Racemic N-Heterocyclic Carbene Silver(I), Gold(I) and Palladium(II) Complexes: Synthesis, Characterization and Computational Structures

Abstract Views: 432  |  PDF Views: 124

Authors

Sonali Ramgopal Mahule
Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India

Abstract


In this study, Ag(I), Au(I) and Pd(II) bis-N-hetero-cyclic carbene (NHC) complexes derived from axially chiral R-1,1′-binaphthyl-2,2′-diol (R-BINOL) and racemic biphenyl-2,2′-diol scaffolds have been synthe-sized. The metallation of these bis-imidazolium and bis-triazolium types of ligand precursors of R-BINOL and biphenol unit, viz. (1–4)d has been achieved using standard procedure. The {[L(L′-NHC)2]Ag}Cl-type, chiral (1–2)e and racemic (3–4)e complexes have been obtained by the treatment of ligand with Ag2O. Similarly, chiral Pd(II) (1f) and Au(I) (1g) complexes have been synthesized and analysed using spectroscopic techniques. The geometry-optimized structures obtained through the density functional theory display good proximity with the reported X-ray structures of similar type of Ag(I), AAu(I) and Pd(II) complexes.

Keywords


Axial Chirality, Density Functional Theory, Ligands, Racemic Complex.

References





DOI: https://doi.org/10.18520/cs%2Fv118%2Fi7%2F1035-1041