Electronic and structural studies of immobilized thiol-derivatized cobalt porphyrins on gold surfaces

Berner, Simon; Lidbaum, Hans; Ledung, Greger; Åhlund, John; Nilson, Katharina; Schiessling, Joachim; Gelius, U.; Bäckvall, Jan‐Erling; Puglia, Carla; Oscarsson, Sven

doi:10.1016/j.apsusc.2007.03.066

Cited by 35 publications

(51 citation statements)

References 38 publications

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“…8c), but the thiolate peak of GN:1 appears at 1.0 eV lower energy than that of 1. This result indicates that thioacetyl groups of 1 dissociated to form S-Au bond [28][29][30]. The S(2p) peak of GN:2 at 163.4 eV is also assigned to sulfur binding to gold nanoparticles.…”

Section: Methodsmentioning

confidence: 80%

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Size Controlled Synthesis of Gold Nanoparticles by Porphyrin with Four Sulfur Atoms

et al. 2009

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Tetradentate thioacetyl porphyrin ligand (1) was synthesized to protect gold nanoparticles. 1-protected gold nanoparticles were characterized by UV-vis spectroscopy and XPS. Analysis by XPS showed that all of four thioacetyl groups of 1 were dissociated and bound to the surface of gold nanoparticles in thiolate form. The size of 1-protected gold nanoparticles (GN:1) was controlled by thioacetyl group/HAuCl 4 molar ratio and approached to 2 nm. Compared with a protecting ligand without porphyrin plane (2) or dodecanethiol, 1 can control the size of gold nanoparticles efficiently probably due to the tetradentate ligation effect.

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Section: Methodsmentioning

confidence: 80%

“…Berner et al previously studied the binding mode of tetrathioacetyl cobalt porphyrin with four thioacetyl groups at meta position of phenyl rings to planer gold substrates by XPS [29,30]. In their system, some thioacetyl groups dissociate to form S-Au bonds and some thioacetyl groups remain without formation of S-Au bonds.…”

Section: Methodsmentioning

confidence: 97%

Size Controlled Synthesis of Gold Nanoparticles by Porphyrin with Four Sulfur Atoms

et al. 2009

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“…adsorbed of thiolate at high coordination site such as kink site on the gold surface [32][33][34]. Peaks at this BE have previously been observed on thioaromatic monolayers, where the latter assignment was favored [8,35,36]. The last S 2p 3/2 doublet at a higher BE of 163.4-163.7 eV, denoted as S3, corresponds to unbound sulfur [37] which can be either the free thiol (ASH) [6] or the thioacetyl (ASAc) [38].…”

Section: Xps Measurementsmentioning

confidence: 85%

“…The previous efforts made by Berner et al. [8] revealed that the different routes for the removal of the protective acetyl group affect the electronic structure of the thiol-derived porphyrin layer on a gold surface. Furthermore, it has been reported that the acetyl group could be deprotected in situ upon direct exposure to the gold surface [12].…”

Section: Introductionmentioning

confidence: 98%

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Molecular orientation of thiol-derivatized tetraphenylporphyrin on gold studied by XPS and NEXAFS

et al. 2009

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Cyclopalladated Arylimine Self‐Assembly Films for Suzuki Reaction

Zhao

Zhai

et al. 2013

ChemCatChem

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A series of cyclopalladated arylimine self‐assembly films were prepared through chemical grafting to substrates and used to catalyze a Suzuki coupling reaction. Atomic force microscopy, water contact angle analysis, cyclic voltammetry, scanning electron microscopy, attenuated total‐reflectance infrared, and X‐ray photoelectron spectroscopy were used to analyze the morphology and composition of the heterogeneous catalysts. The results show that these cyclopalladated arylimine self‐assembly films immobilized on substrates could be used as efficient and reusable heterogeneous catalysts in the Suzuki reaction of aryl bromides under open air conditions in aqueous solution. These catalysts exhibited 10 times the catalytic performance of the homogeneous counterpart. The palladium catalysts were grafted onto the internal surface of the round‐bottomed flasks. The reaction flasks acted as both reaction vessels and catalysts, which simplified the reaction operations. The catalysts were run over 8 cycles without showing any sign of deactivation, suggesting the potential of the catalysts as advanced functional materials with applications in the heterogeneous catalysis of Suzuki reactions.

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Electronic and structural studies of immobilized thiol-derivatized cobalt porphyrins on gold surfaces

Cited by 35 publications

References 38 publications

Size Controlled Synthesis of Gold Nanoparticles by Porphyrin with Four Sulfur Atoms

Size Controlled Synthesis of Gold Nanoparticles by Porphyrin with Four Sulfur Atoms

Molecular orientation of thiol-derivatized tetraphenylporphyrin on gold studied by XPS and NEXAFS

Cyclopalladated Arylimine Self‐Assembly Films for Suzuki Reaction

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