Understanding host-guest interaction of trimesic acid in a porous molecular network

van Zuilen, J (2020) Understanding host-guest interaction of trimesic acid in a porous molecular network. Bachelor's Thesis, Applied Physics.

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Abstract

In this research the host-guest network of 3-deh-DPDI and trimesic acid (TMA) on a Cu(111) surface is studied. 3-deh-DPDI is the deprotonated form of 4,9-diaminoperyline-quinone-3,10,diimine (DPDI) where the nitrogen atoms form double bonds with one another. The 3-deh-DPDI network is a self-assembled network (SAN) that acts as a host for the TMA molecules. The goal of the research was to understand the host-guest interactions of this network. To achieve this, scanning tunneling microscope (STM) images of the network are analysed. The images were obtained under ultra high vacuum (UHV) conditions. The unit cell of the network has lattice parameters a = 2.3 nm, b = 2.2 nm and θ = 57◦. For a low TMA coverage it is found that the TMA molecules prefer to sit alone inside a pore. For higher TMA coverages the TMA molecules do not show a clear preference. It is found that the TMA molecules sit lower inside the pore after annealing at 150◦C. Furthermore, molecular models that describe how the TMA molecules sit inside the pores of the network are proposed. In the proposed models the TMA molecules are fully deprotonated and coordinate together with Cu adatoms that have diffused from the step edges of the surface.

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Stohr, M.A. and Koster, L.J.A.
Degree programme:	Applied Physics
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	17 Jul 2020 09:21
Last Modified:	17 Jul 2020 09:21
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/22718

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