Langmuir Films of Anthracene Derivatives on Liquid Mercury II: Asymmetric Molecules

doi:10.1021/jp063937g

Title: Langmuir Films of Anthracene Derivatives on Liquid Mercury II: Asymmetric Molecules

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Abstract

The structure and phase sequence of liquid-mercury-supported Langmuir films (LFs) of anthrone and anthralin were studied by surface tensiometry and surface-specific synchrotron X-ray diffraction. In the low-coverage phase the molecules are both side-lying, rather than the flat-lying orientation found for anthracene and anthraquinone. In the high-coverage phase, the molecules are either standing up (anthrone) or remain side-lying (anthralin) on the mercury surface. In contrast with the symmetric anthracene and anthraquinone, both high-coverage phases exhibit long-range in-plane order. The order is different for the two compounds. The structural details, the role of molecular symmetry, the oxygen side groups, and the asymmetry-induced dipole moments are discussed.

Authors:: Tamam,L.; Kraack, H.; Sloutskin, E.; Ocko, B.; Pershan, P.; Ofer, E.; Deutsch, M.

Publication Date:: Mon Jan 01 00:00:00 EST 2007

Research Org.:: Brookhaven National Laboratory (BNL) National Synchrotron Light Source

Sponsoring Org.:: Doe - Office Of Science

OSTI Identifier:: 930283

Report Number(s):: BNL-80987-2008-JA
TRN: US0806724

DOE Contract Number:: DE-AC02-98CH10886

Resource Type:: Journal Article

Resource Relation:: Journal Name: Journal of Physical Chemistry C; Journal Volume: 111

Country of Publication:: United States

Language:: English

Subject:: 43 PARTICLE ACCELERATORS; ANTHRACENE; DIPOLE MOMENTS; EXHIBITS; FILMS; LIQUIDS; MERCURY; MOLECULES; ORIENTATION; OXYGEN; SURFACES; SYMMETRY; SYNCHROTRONS; X-RAY DIFFRACTION; national synchrotron light source

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                    Tamam,L., Kraack, H., Sloutskin, E., Ocko, B., Pershan, P., Ofer, E., and Deutsch, M. Langmuir Films of Anthracene Derivatives on Liquid Mercury II: Asymmetric Molecules.  United States: N. p., 2007. 
        Web.  doi:10.1021/jp063937g.

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                    Tamam,L., Kraack, H., Sloutskin, E., Ocko, B., Pershan, P., Ofer, E., & Deutsch, M. Langmuir Films of Anthracene Derivatives on Liquid Mercury II: Asymmetric Molecules.  United States.  doi:10.1021/jp063937g.

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                    Tamam,L., Kraack, H., Sloutskin, E., Ocko, B., Pershan, P., Ofer, E., and Deutsch, M. Mon .  
        "Langmuir Films of Anthracene Derivatives on Liquid Mercury II: Asymmetric Molecules".  United States.  
        doi:10.1021/jp063937g.

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@article{osti_930283,

  title        = {Langmuir Films of Anthracene Derivatives on Liquid Mercury II: Asymmetric Molecules},

  author       = {Tamam,L. and Kraack, H. and Sloutskin, E. and Ocko, B. and Pershan, P. and Ofer, E. and Deutsch, M.},

  abstractNote = {The structure and phase sequence of liquid-mercury-supported Langmuir films (LFs) of anthrone and anthralin were studied by surface tensiometry and surface-specific synchrotron X-ray diffraction. In the low-coverage phase the molecules are both side-lying, rather than the flat-lying orientation found for anthracene and anthraquinone. In the high-coverage phase, the molecules are either standing up (anthrone) or remain side-lying (anthralin) on the mercury surface. In contrast with the symmetric anthracene and anthraquinone, both high-coverage phases exhibit long-range in-plane order. The order is different for the two compounds. The structural details, the role of molecular symmetry, the oxygen side groups, and the asymmetry-induced dipole moments are discussed.},

  doi          = {10.1021/jp063937g},

  journal      = {Journal of Physical Chemistry C},

  number       = ,

  volume       = 111,

  place        = {United States},

  year         = {Mon Jan 01 00:00:00 EST 2007},

  month        = {Mon Jan 01 00:00:00 EST 2007}

}

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DOI: 10.1021/jp063937g

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Langmuir Fiilms of Anthracene Derivatives on Liquid Mercury I: Symmetric Molecules

Tamam,L. ; Kraack, H. ; Sloutskin, E. ; ... - Journal of Physical Chemistry C

The structure and phase sequence of liquid-mercury-supported Langmuir films (LFs) of two symmetric acenes, anthracene and anthraquinone, were studied by surface tensiometry and X-ray diffraction. At low coverage, both form a monolayer of surface-parallel, flat-lying, molecules. At high coverage, we find a monolayer of side-lying molecules, where the molecular plane is surface-normal, and the molecular long axis is surface-parallel. None of these phases exhibit long-range in-plane order.
DOI: 10.1021/jp063936o
Langmuir Films of Polycyclic Molecules on Mercury

Tamam,L. ; Kraack, H. ; Sloutskin, E. ; ... - Thin Solid Films

Langmuir films (LFs) of biphenyl and anthracene derivatives on the surface of liquid mercury were studied by surface-specific X-ray and surface tension measurements. Phases of lying-down, side-lying and standing-up molecules were found, some of which exhibit long-range lateral order. The molecular symmetry and the position and nature of the side-, end-, and headgroups are shown to dominate the structural evolution of the LFs with surface coverage.
DOI: 10.1016/j.tsf.2007.01.037
Langmuir Films of Chiral Molecules on Mercury

Tamam, L. ; Menahem, T ; Mastai, Y ; ... - Langmuir

Homo- and heterochiral Langmuir films of a chiral derivative of stearic acid are studied in situ on the surface of liquid mercury as a function of surface coverage by surface tensiometry and surface-specific synchrotron X-ray diffraction and reflectivity. A transition from a phase of surface-parallel molecules to a phase of standing-up molecules is found. The former shows no surface-parallel long-range order. The standing-up phase of both homochiral and heterochiral compositions exhibit long-range order. However, the former has an oblique unit cell with parallel molecular planes, and the later has a centered rectangular unit cell with a herringbone molecular packing. Formore »« less
DOI: 10.1021/la804109h
Alkyl-thiol Langmuir Films on the Surface Liquid Mercury

Kraack,H. ; Tamam, L. ; Sloutskin, E. ; ... - Langmuir

The coverage dependent phase behavior of monolayers of alkyl thiols (CH{sub 3}(CH{sub 2}){sub n-1}SH, denoted as CnSH) on mercury was studied for chain lengths 9 {le} n {le} 22, using surface tensiometry and surface-specific X-ray scattering methods. At low coverage, a disordered single layer of surface-parallel molecules is found for all n. At high coverage, a monolayer of standing-up molecules is formed, exhibiting well-ordered phases, the structure of which is n- and coverage-dependent. The molecular chains pack in a centered rectangular unit cell, with an {approx}27{sup o} tilt from the surface normal toward nearest neighbors. The strong sulfur-mercury bond inducesmore »« less
DOI: 10.1021/la0701430
LANGMUIR FILMS OF NORMAL-ALKANES ON THE SURFACE OF LIQUID MERCURY

KRAACK,H. ; OCKO,B. ; PERSHAN,P. ; ... - Journal of Chemical Physics

No abstract prepared.
DOI: 10.1063/1.1618211