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Issue 12, 2019
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A stochastic model study on the self-assembly process of a Pd2L4 cage consisting of rigid ditopic ligands

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Abstract

The coordination self-assembly process of a Pd2L4 cage including rigid ditopic ligands, L, was studied numerically. A recently developed experimental approach (QASAP: quantitative analysis of self-assembly process) revealed that the rate-determining steps in the self-assembly of the Pd2L4 cage are intramolecular ligand exchanges at the late stages of the self-assembly. In this study, the self-assembly process before the rate-determining steps, which could not be investigated by experiment, was analyzed based on a minimal reaction network model. Only eight variable parameters of rate constants for ligand exchange reactions are sufficient enough to reproduce the time evolution of substrates and the products during the self-assembly of the cage. With these parameters, the major self-assembly pathway was determined. It was also found that a non-negligible amount of an incomplete cage (IC), Pd2L3X2 (X indicates the leaving ligand), which was not suggested by QASAP, should be transiently produced. Numerical tests also suggest that the small rate constant value of the intramolecular ligand exchanges due to a restricted geometry causes the final stage to seemingly become the rate-determining step.

Graphical abstract: A stochastic model study on the self-assembly process of a Pd2L4 cage consisting of rigid ditopic ligands

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Article information


Submitted
28 Sep 2018
Accepted
28 Nov 2018
First published
28 Nov 2018

Phys. Chem. Chem. Phys., 2019,21, 6341-6347
Article type
Paper

A stochastic model study on the self-assembly process of a Pd2L4 cage consisting of rigid ditopic ligands

S. Takahashi, Y. Sasaki, S. Hiraoka and H. Sato, Phys. Chem. Chem. Phys., 2019, 21, 6341
DOI: 10.1039/C8CP06102E

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