NDLI: Determination of geometric orientation of adsorbed cinchonidine on Pt and Fe and quiphos on Pt nanoclusters via DRIFTS.

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Determination of geometric orientation of adsorbed cinchonidine on Pt and Fe and quiphos on Pt nanoclusters via DRIFTS.

Content Provider	Semantic Scholar
Author	Kraynov, Alexander Suchopar, Andreas D'Souza, Louis Richards, Ryan
Copyright Year	2006
Abstract	Platinum nanoclusters modified with cinchonidine have been employed as 'quasi-homogeneous' catalysts for the hydrogenation of ethyl pyruvate and have demonstrated exceptional activities while the ee's of these systems are currently inferior to the traditional Pt/Al2O3 heterogeneous system. For the bulk systems it has been shown that the orientation of the modifier on the metal surface is a critical parameter influencing catalytically induced enantioselectivity. It has been speculated that the lower observed ee's for the nanocluster systems are a result of the modifier assuming an orientation unfavorable for inducing enantioselectivity due to the lack of large numbers of planar metal atoms. Using DRIFTS (diffuse reflectance infra-red Fourier transform spectroscopy) analysis of samples together with geometry optimization and IR modelling we have studied the orientation of cinchonidine on Pt and Fe nanoclusters and additionally the man-made ligand quiphos on Pt nanoclusters. It has been determined that cinchonidine can adsorb on Pt and Fe nanoclusters in both 'flat' and 'tilted' modes, while quiphos can be adsorbed on Pt only via the 'pi-bonded' mode. These studies thus provide an insight into modifier orientation on nanocluster surfaces that can be extended to a wide range of potential modifiers and facilitate a better understanding of the origin of enantioselectivity with these 'quasi-homogeneous' catalyst systems.
File Format	PDF HTM / HTML
DOI	10.1039/B514750F
PubMed reference number	16633613
Journal	Medline
Volume Number	8
Issue Number	11
Alternate Webpage(s)	https://www.researchgate.net/profile/Andreas_Suchopar/publication/7146431_Determination_of_geometric_orientation_of_adsorbed_cinchonidine_on_Pt_and_Fe_and_quiphos_on_Pt_nanoclusters_via_DRIFTS/links/02bfe51111aff718d6000000.pdf?disableCoverPage=true&inViewer=true&origin=publication_detail
Alternate Webpage(s)	https://doi.org/10.1039/B514750F
Journal	Physical chemistry chemical physics : PCCP
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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