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Self-assembled organic and metal-org...

Sandahl, Jennifer.

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Self-assembled organic and metal-organic nanostructures at surfaces: Studies of 2,5-pyrazinedicarboxylic acid and Cr on Cu(100).

Record Type:	Electronic resources : Monograph/item
Title/Author:	Self-assembled organic and metal-organic nanostructures at surfaces: Studies of 2,5-pyrazinedicarboxylic acid and Cr on Cu(100)./
Author:	Sandahl, Jennifer.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
Description:	51 p.
Notes:	Source: Masters Abstracts International, Volume: 56-01.
Contained By:	Masters Abstracts International56-01(E).
Subject:	Physical chemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10155595
ISBN:	9781369106695

Self-assembled organic and metal-organic nanostructures at surfaces: Studies of 2,5-pyrazinedicarboxylic acid and Cr on Cu(100).
Sandahl, Jennifer.

Self-assembled organic and metal-organic nanostructures at surfaces: Studies of 2,5-pyrazinedicarboxylic acid and Cr on Cu(100). - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 51 p.

Source: Masters Abstracts International, Volume: 56-01.

Thesis (M.S.)--Indiana University, 2016.

Self-assembled nanostructures of 2,5-pyrazine dicarboxylic acid (PDA) on a model noble metal surface, Cu(100), are studied to probe intermolecular interactions in 1D and 2D organic nanostructures. Cr was added to the surface in an attempt to form Metal Organic Coordination Networks (MOCNs). All work has been done under ultra-high vacuum conditions, with analysis done using X-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM). The PDA molecule is similar in structure to terephthalic acid (TPA), which has been extensively studied, but contains two nitrogen atoms in the ring. After deposition on a room temperature surface, the PDA molecules form islands with a mixture of a square structure and a quasihexagonal structure. The square structure has similar measurements to the square structure formed by TPA, but the growth direction is different from the growth direction of the TPA islands, indicating a difference in surface adsorption between TPA and PDA. The quasihexagonal structure is similar to one formed by TPA, but does not require a saturated monolayer or annealing to form, which is required for formation in TPA. After annealing at or above 80 °C, PDA forms 2D islands with a rectangular structure and 1D chains of molecules, with some islands with the square and quasihexagonal structures remaining. The PDA molecular chains grow in the same directions as the TPA molecular islands and have similar molecular spacing. They differ from TPA because of the prochiral nature of PDA causing the PDA molecules to self-select into homochiral chains. The 1D chains are likely caused by repulsive interactions between the lone pairs of the ring nitrogen atoms and the electronegative carboxylate oxygen atoms, inhibiting growth in one direction. XPS after annealing is not significantly different from spectra before annealing, indicating no decomposition of the adsorbed PDA. Studies of Cr complexation with PDA show an interaction between the two, but no organized structure was observed.

ISBN: 9781369106695Subjects--Topical Terms:

1981412
Physical chemistry.

Self-assembled organic and metal-organic nanostructures at surfaces: Studies of 2,5-pyrazinedicarboxylic acid and Cr on Cu(100).
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520 $a Self-assembled nanostructures of 2,5-pyrazine dicarboxylic acid (PDA) on a model noble metal surface, Cu(100), are studied to probe intermolecular interactions in 1D and 2D organic nanostructures. Cr was added to the surface in an attempt to form Metal Organic Coordination Networks (MOCNs). All work has been done under ultra-high vacuum conditions, with analysis done using X-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM). The PDA molecule is similar in structure to terephthalic acid (TPA), which has been extensively studied, but contains two nitrogen atoms in the ring. After deposition on a room temperature surface, the PDA molecules form islands with a mixture of a square structure and a quasihexagonal structure. The square structure has similar measurements to the square structure formed by TPA, but the growth direction is different from the growth direction of the TPA islands, indicating a difference in surface adsorption between TPA and PDA. The quasihexagonal structure is similar to one formed by TPA, but does not require a saturated monolayer or annealing to form, which is required for formation in TPA. After annealing at or above 80 °C, PDA forms 2D islands with a rectangular structure and 1D chains of molecules, with some islands with the square and quasihexagonal structures remaining. The PDA molecular chains grow in the same directions as the TPA molecular islands and have similar molecular spacing. They differ from TPA because of the prochiral nature of PDA causing the PDA molecules to self-select into homochiral chains. The 1D chains are likely caused by repulsive interactions between the lone pairs of the ring nitrogen atoms and the electronegative carboxylate oxygen atoms, inhibiting growth in one direction. XPS after annealing is not significantly different from spectra before annealing, indicating no decomposition of the adsorbed PDA. Studies of Cr complexation with PDA show an interaction between the two, but no organized structure was observed.
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