The site-specific reaction of tetrairon(III) propeller-like clusters,with tripodal ligands derived from 2-hydroxymethyl-propane-1,3-diol was investigated as a route to graft these single molecule magnets (SMMs) on Si(100). A silicon surface prefunctionalized with a long-chain trimethylol derivative was reacted with [Fe-4(OMe)(6)(tmhd)(6)] (1) and [Fe-4(L)(2)(tmhd)(6)] (2), and the reaction course was followed by X-ray photoelectron spectroscopy (XPS), attenuated total reflection-infrared spectroscopy, and atomic force microscopy (Htmhd = 2,2,6,6-tetramethylheptane-3,5-dione, H3L = 2-(4-chloro-phenyl)-2-hydroxymethyl-propane-1,3-diol). Chlorine-marked complex 2 was specifically designed to monitor the ligand-exchange reaction by XPS. This technique showed that the amount of Fe at the surface closely parallels the surface concentration of tripodal receptors. For low receptor concentrations the Cl/Fe atomic ratio is halved as compared with solid 2, as expected for intact molecules linked to the surface via one receptor only. For high receptor concentrations, the Cl/Fe ratio drops to zero, as expected for a complete replacement of L3- ligands by surface-bound receptors.
Site-specific anchoring of tetrairon(III) single molecule magnets on functionalized Si(100) surfaces / G. G. Condorelli; A. Motta; G. Pellegrino; A. Cornia; L. Gorini; L. L. Fragala; C. Sangregorio; L. Sorace. - In: CHEMISTRY OF MATERIALS. - ISSN 0897-4756. - STAMPA. - 20:(2008), pp. 2405-2411. [10.1021/cm703561c]
Site-specific anchoring of tetrairon(III) single molecule magnets on functionalized Si(100) surfaces
SANGREGORIO, CLAUDIO;SORACE, LORENZO
2008
Abstract
The site-specific reaction of tetrairon(III) propeller-like clusters,with tripodal ligands derived from 2-hydroxymethyl-propane-1,3-diol was investigated as a route to graft these single molecule magnets (SMMs) on Si(100). A silicon surface prefunctionalized with a long-chain trimethylol derivative was reacted with [Fe-4(OMe)(6)(tmhd)(6)] (1) and [Fe-4(L)(2)(tmhd)(6)] (2), and the reaction course was followed by X-ray photoelectron spectroscopy (XPS), attenuated total reflection-infrared spectroscopy, and atomic force microscopy (Htmhd = 2,2,6,6-tetramethylheptane-3,5-dione, H3L = 2-(4-chloro-phenyl)-2-hydroxymethyl-propane-1,3-diol). Chlorine-marked complex 2 was specifically designed to monitor the ligand-exchange reaction by XPS. This technique showed that the amount of Fe at the surface closely parallels the surface concentration of tripodal receptors. For low receptor concentrations the Cl/Fe atomic ratio is halved as compared with solid 2, as expected for intact molecules linked to the surface via one receptor only. For high receptor concentrations, the Cl/Fe ratio drops to zero, as expected for a complete replacement of L3- ligands by surface-bound receptors.File | Dimensione | Formato | |
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