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Stereoselective interactions as manifested by vibrational circular dichroism spectra: the interplay between chiral metal complexes co-adsorbed in a montmorillonite clay
Stereoselective interactions as manifested by vibrational circular dichroism spectra: the interplay between chiral metal complexes co-adsorbed in a montmorillonite clay
- Source :
- Physical chemistry chemical physics : PCCP. 20(39)
- Publication Year :
- 2018
-
Abstract
- Vibrational circular dichroism (VCD) spectroscopy was applied to study intermolecular interactions on the surface of a clay mineral. A montmorillonite clay loaded with two kinds of chiral molecules was prepared. Firstly a cationic ruthenium(ii) complex, Δ- or Λ-[Ru(phen)3]2+ (phen = 1,10-phenanthroline), was ion-exchanged into sodium montmorillonite (denoted as [Ru(phen)3]2+/mont). Thereafter a neutral metal(iii) complex, Δ- or Λ-[M(acac)3] (acac = acetylacetonato; M = Co and Cr), was adsorbed spontaneously, when the complex was added to an aqueous dispersion of [Ru(phen)3]2+/mont (denoted as [M(acac)3]/[Ru(phen)3]2+/mont). VCD measurements were performed on a KBr disk containing ca. 1 wt% of solid [M(acac)3]/[Ru(phen)3]2+/mont. Both of the chiral components gave clear VCD peaks in the wavelength region of 1200-1800 cm-1. Attention was focussed on the spectral differences between the following two samples: the one containing a pair of co-adsorbed chelates with the same chirality (i.e. Λ-[M(acac)3]/Λ-[Ru(phen)3]2+/mont or Δ-[M(acac)3]/Δ-[Ru(phen)3]2+/mont) and the other containing a pair of co-adsorbed chelates with the opposite chirality (i.e. Δ-[M(acac)3]/Λ-[Ru(phen)3]2+/mont or Λ-[M(acac)3]/Δ-[Ru(phen)3]2+/mont). Notably a new peak shoulder appeared and the relative peak intensity of the couplet peaks varied, depending on the chirality relation between the co-existing complexes. With the help of theoretical calculations, these results were rationalized in terms of the stereoselective intermolecular interactions.
- Subjects :
- 010405 organic chemistry
Intermolecular force
Cationic polymerization
General Physics and Astronomy
chemistry.chemical_element
010402 general chemistry
01 natural sciences
0104 chemical sciences
Ruthenium
Metal
Crystallography
chemistry.chemical_compound
Montmorillonite
chemistry
visual_art
Vibrational circular dichroism
visual_art.visual_art_medium
Physical and Theoretical Chemistry
Chirality (chemistry)
Spectroscopy
Subjects
Details
- ISSN :
- 14639084
- Volume :
- 20
- Issue :
- 39
- Database :
- OpenAIRE
- Journal :
- Physical chemistry chemical physics : PCCP
- Accession number :
- edsair.doi.dedup.....094da52f6c06f0be74d59961384a2807