Pronounced Odd-Even Changes in the Molecular Arrangement and Packing Density of Biphenyl-Based Thiol SAMs: A Combined STM and LEED Study

W Azzam; P Cyganik; G Witte; Manfred Buck; C Wöll

doi:10.1021/la030165w

Pronounced Odd-Even Changes in the Molecular Arrangement and Packing Density of Biphenyl-Based Thiol SAMs: A Combined STM and LEED Study

W Azzam, P Cyganik, G Witte, Manfred Buck, C Wöll

Research output: Contribution to journal › Article › peer-review

Abstract

Self-assembled monolayers (SAMs) of omega-(4'-methylbiphenyl-4-yl) alkanethiols CH3(C6H4)(2)(CH2)(n)SH (BPn, n = 3 and 4) on Au(111) substrates were studied using scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED). Preparation at elevated temperature results in highly ordered layers with large domains. Whereas the (2root3 x root3) structure of the BP3 SAMs is similar to that reported previously for other aromatic thiols SAMs made from BP4 exhibit a very different structure. A (5root3 x 3)rect unit cell containing 8 molecules is found which corresponds to a packing density reduced by 25% compared to that of BP3. The odd-even effect observed in the molecularly resolved STM images of BP3 and BP4, therefore, confirms the pronounced influence of the spacer chain on the structure of these biphenylbased SAMs.

Original language	English
Pages (from-to)	8262-8270
Number of pages	9
Journal	Langmuir
Volume	19
Issue number	20
DOIs	https://doi.org/10.1021/la030165w
Publication status	Published - 30 Sept 2003

Keywords

SELF-ASSEMBLED MONOLAYERS
SCANNING-TUNNELING-MICROSCOPY
AU(111)
GOLD
ADSORPTION
SURFACES
DESORPTION
ARENETHIOLS
SULFUR
SILVER

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title = "Pronounced Odd-Even Changes in the Molecular Arrangement and Packing Density of Biphenyl-Based Thiol SAMs: A Combined STM and LEED Study",

abstract = "Self-assembled monolayers (SAMs) of omega-(4'-methylbiphenyl-4-yl) alkanethiols CH3(C6H4)(2)(CH2)(n)SH (BPn, n = 3 and 4) on Au(111) substrates were studied using scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED). Preparation at elevated temperature results in highly ordered layers with large domains. Whereas the (2root3 x root3) structure of the BP3 SAMs is similar to that reported previously for other aromatic thiols SAMs made from BP4 exhibit a very different structure. A (5root3 x 3)rect unit cell containing 8 molecules is found which corresponds to a packing density reduced by 25\% compared to that of BP3. The odd-even effect observed in the molecularly resolved STM images of BP3 and BP4, therefore, confirms the pronounced influence of the spacer chain on the structure of these biphenylbased SAMs.",

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author = "W Azzam and P Cyganik and G Witte and Manfred Buck and C W{\"o}ll",

year = "2003",

month = sep,

day = "30",

doi = "10.1021/la030165w",

language = "English",

volume = "19",

pages = "8262--8270",

journal = "Langmuir",

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T1 - Pronounced Odd-Even Changes in the Molecular Arrangement and Packing Density of Biphenyl-Based Thiol SAMs: A Combined STM and LEED Study

AU - Azzam, W

AU - Cyganik, P

AU - Witte, G

AU - Buck, Manfred

AU - Wöll, C

PY - 2003/9/30

Y1 - 2003/9/30

N2 - Self-assembled monolayers (SAMs) of omega-(4'-methylbiphenyl-4-yl) alkanethiols CH3(C6H4)(2)(CH2)(n)SH (BPn, n = 3 and 4) on Au(111) substrates were studied using scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED). Preparation at elevated temperature results in highly ordered layers with large domains. Whereas the (2root3 x root3) structure of the BP3 SAMs is similar to that reported previously for other aromatic thiols SAMs made from BP4 exhibit a very different structure. A (5root3 x 3)rect unit cell containing 8 molecules is found which corresponds to a packing density reduced by 25% compared to that of BP3. The odd-even effect observed in the molecularly resolved STM images of BP3 and BP4, therefore, confirms the pronounced influence of the spacer chain on the structure of these biphenylbased SAMs.

AB - Self-assembled monolayers (SAMs) of omega-(4'-methylbiphenyl-4-yl) alkanethiols CH3(C6H4)(2)(CH2)(n)SH (BPn, n = 3 and 4) on Au(111) substrates were studied using scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED). Preparation at elevated temperature results in highly ordered layers with large domains. Whereas the (2root3 x root3) structure of the BP3 SAMs is similar to that reported previously for other aromatic thiols SAMs made from BP4 exhibit a very different structure. A (5root3 x 3)rect unit cell containing 8 molecules is found which corresponds to a packing density reduced by 25% compared to that of BP3. The odd-even effect observed in the molecularly resolved STM images of BP3 and BP4, therefore, confirms the pronounced influence of the spacer chain on the structure of these biphenylbased SAMs.

KW - SELF-ASSEMBLED MONOLAYERS

KW - SCANNING-TUNNELING-MICROSCOPY

KW - AU(111)

KW - GOLD

KW - ADSORPTION

KW - SURFACES

KW - DESORPTION

KW - ARENETHIOLS

KW - SULFUR

KW - SILVER

UR - https://www.scopus.com/pages/publications/0141957177

UR - http://pubs.acs.org/cgi-bin/abstract.cgi/langd5/2003/19/i20/abs/la030165w.html

U2 - 10.1021/la030165w

DO - 10.1021/la030165w

M3 - Article

SN - 0743-7463

VL - 19

SP - 8262

EP - 8270

JO - Langmuir

JF - Langmuir

IS - 20

ER -

Pronounced Odd-Even Changes in the Molecular Arrangement and Packing Density of Biphenyl-Based Thiol SAMs: A Combined STM and LEED Study

Abstract

Keywords

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