Ionic hydrogen bonds controlling two-dimensional supramolecular systems at a metal surface

被引：115

作者：

Payer, Dietmar

Comisso, Alessio

Dmitriev, Alexandre

Strunskus, Thomas

Lin, Nian

Woell, Christof

DeVita, Alessandro

Barth, Johannes V.

Kern, Klaus

机构：

[1] Max Planck Inst Festkorperforsch, D-70563 Stuttgart, Germany

[2] Univ Trieste, CENMAT, I-34127 Trieste, Italy

[3] INFM DEMOCRITOS Natl Simulat Ctr, Trieste, Italy

[4] Ruhr Univ Bochum, Lehrstuhl Phys Chem 1, D-44780 Bochum, Germany

[5] Kings Coll London, Dept Phys, London WC2R 2LS, England

[6] Ecole Polytech Fed Lausanne, Inst Phys Nanostruct, CH-1015 Lausanne, Switzerland

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2007年 / 13卷 / 14期

关键词：

ab initio calculations; carboxylic acids; hydrogen bonds; scanning tunneling microscopy; supramolecular self-assembly;

D O I：

10.1002/chem.200601325

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Hydrogen-bond formation between ionic adsorbates on an Ag(III) surface under ultrahigh vacuum was studied by scanning tunneling microscopy/spectroscopy (STM/STS), Xray photoelectron spectroscopy (XPS), near-edge X-ray absorption fine structure (NEXAFS), and molecular dynamics calculations. The adsorbate, 1,3,5-benzenetricarboxylic acid (trimesic acid, TMA), self-assembles at low temperatures (250-300 K) into the known open honeycomb motif through neutral hydrogen bonds formed between carboxyl groups, whereas annealing at 420 K leads to a densely packed quartet structure consisting of flat-lying molecules with one deprotonated carboxyl group per molecule. The resulting charged carboxylate groups form intermolecular ionic hydrogen bonds with enhanced strength compared to the neutral hydrogen bonds; this represents an alternative supramolecular bonding motif in 2D supramolecular organization.

引用

页码：3900 / 3906

页数：7

共 49 条

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