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Title of article :
Chiral metal surfaces from the adsorption of chiral and achiral molecules
Author/Authors :
V. Humblot، نويسنده , , R. Raval*، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2005
Pages :
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Abstract :
Chiral surfaces, capable of existing in two distinguishable mirror forms that cannot be superimposed, are attracting worldwide attention. The adsorption of complex organic molecules provides a means of introducing the ultimate discrimination function of chirality to a metal surface. Here, a comparison of the chiral tartaric acid (HOOC–CHOH–CHOH–COOH) molecule and the achiral succinic acid (HOOC–CH2–CH2–COOH) molecule on a Cu(110) surface is presented. For both molecules, twodimensional assembly is found to depend strongly on molecule–metal bonding interactions, whereas the presence/absence of the OH groups causes subtler, second-order effects on the self-assembled structure. The driving force for creating chiral organisations is shown to arise from adsorption-induced asymmetrisation, via molecular distortion and/or metal reconstruction of the local adsorption unit. The macroscopic chirality of the surface is then determined by whether nucleation points of both chirality can be equally created, or whether non-degeneracy can be introduced to favour one chirality.
Keywords :
Chemisorption , Chirality , carboxylates , surfaces
Journal title :
Applied Surface Science
Journal title :
Applied Surface Science
Serial Year :
Link To Document :