Adsorption of 1,3,5-triphenylbenzene （TPB） molecules on Cu（100） surface is studied using ultraviolet photo- electron spectroscopy （UPS） and density functional theory （DFT） calculations. Researches on the botto...Adsorption of 1,3,5-triphenylbenzene （TPB） molecules on Cu（100） surface is studied using ultraviolet photo- electron spectroscopy （UPS） and density functional theory （DFT） calculations. Researches on the bottom-up fabrication of graphene nanoflakes （GNFs） with TPB as a precursor on the Cu（100） surface are carried out based on UPS and DFT calculations. Three emission features d, e and f originating from the TPB molecules are located at 3.095, 7.326 and 9.349 eV below the Fermi level, respectively. With the increase of TPB coverage on the Cu（100） substrate, the work function decreases due to the formation of interfacial dipoles and charge （electron） rearrangement at the TPB/Cu（100） interface. Upon the formation of GNFs, five emission characteristic peaks of g, h, i, j and k originating from the GNFs are located at 1.100, 3.529, 6.984, 8.465 and 9.606eV below the Fermi level, respectively. Angle resolved ultraviolet photoelectron spectroscopy （ARUPS） and DFT calculations indicate that TPB molecules adopt a lying-down configuration with their molecular plane nearly parallel to the Cu（100） substrate at the monolayer stage. At the same time, the lying-down configuration for the GNFs on the Cu（100） surface is also unveiled by ARUPS and DFT calculations.展开更多
Dendrimers are the subject of intense attention recently because of their anticipated potentialities and the peculiar structural properties.A novel synthetic route for the preparation of functionalized dendrons built ...Dendrimers are the subject of intense attention recently because of their anticipated potentialities and the peculiar structural properties.A novel synthetic route for the preparation of functionalized dendrons built on the 1,3,5-benzenetricarboxaldehyde core and endowed with a periphery of pentaerythritol groups has been developed.1,3,5-Tri（2,6-dioxa-4,4-dihydroxymethyl cyclohexyl） benzene（1） was synthesized by the condensation of 1,3,5-benzenetricarboxaldehyde with pentaerythritol in the presence of hot CHCl3 and p-methyl benzene sulfonic acid with 55% yield.By turning 1,3,5-benzenetricarboxaldehyde into its trioxime,it was protected to decrease the cross-linked reaction with compound 1 both including many groups.The reaction of compound 1 with 1,3,5-benzenetricarboxaldehyde trioxime and pentaerythritol afforded 1,3,5-tri{3-[2,4,8,10 -tetra-oxa-9(3,5-di（2,6-dioxa-4,4-dihydroxymethylcyclohexyl） phenyl]spiro\undecyl}benzene（2） by using I2 as the catalyst,and the yield was 25.2%.Product 2 and its intermediates were identified by IR,1H NMR,MS spectra and elemental analysis.展开更多
基金Supported by the National Basic Research Program of China under Grant No 2011CB921903the Scientific Research Fund of Zhejiang Provincial Education Department under Grant Nos Y201121234 and LQ12F04001
文摘Adsorption of 1,3,5-triphenylbenzene （TPB） molecules on Cu（100） surface is studied using ultraviolet photo- electron spectroscopy （UPS） and density functional theory （DFT） calculations. Researches on the bottom-up fabrication of graphene nanoflakes （GNFs） with TPB as a precursor on the Cu（100） surface are carried out based on UPS and DFT calculations. Three emission features d, e and f originating from the TPB molecules are located at 3.095, 7.326 and 9.349 eV below the Fermi level, respectively. With the increase of TPB coverage on the Cu（100） substrate, the work function decreases due to the formation of interfacial dipoles and charge （electron） rearrangement at the TPB/Cu（100） interface. Upon the formation of GNFs, five emission characteristic peaks of g, h, i, j and k originating from the GNFs are located at 1.100, 3.529, 6.984, 8.465 and 9.606eV below the Fermi level, respectively. Angle resolved ultraviolet photoelectron spectroscopy （ARUPS） and DFT calculations indicate that TPB molecules adopt a lying-down configuration with their molecular plane nearly parallel to the Cu（100） substrate at the monolayer stage. At the same time, the lying-down configuration for the GNFs on the Cu（100） surface is also unveiled by ARUPS and DFT calculations.
文摘Dendrimers are the subject of intense attention recently because of their anticipated potentialities and the peculiar structural properties.A novel synthetic route for the preparation of functionalized dendrons built on the 1,3,5-benzenetricarboxaldehyde core and endowed with a periphery of pentaerythritol groups has been developed.1,3,5-Tri（2,6-dioxa-4,4-dihydroxymethyl cyclohexyl） benzene（1） was synthesized by the condensation of 1,3,5-benzenetricarboxaldehyde with pentaerythritol in the presence of hot CHCl3 and p-methyl benzene sulfonic acid with 55% yield.By turning 1,3,5-benzenetricarboxaldehyde into its trioxime,it was protected to decrease the cross-linked reaction with compound 1 both including many groups.The reaction of compound 1 with 1,3,5-benzenetricarboxaldehyde trioxime and pentaerythritol afforded 1,3,5-tri{3-[2,4,8,10 -tetra-oxa-9(3,5-di（2,6-dioxa-4,4-dihydroxymethylcyclohexyl） phenyl]spiro\undecyl}benzene（2） by using I2 as the catalyst,and the yield was 25.2%.Product 2 and its intermediates were identified by IR,1H NMR,MS spectra and elemental analysis.
