Part I: Peptide Dendrimers From Natural Amino Acids. Part II: Nonfullerene Nanotubes From Bridged Dendritic Metalloporphyrin Complexes

Kim, Yoonkyung

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Description

Title

Part I: Peptide Dendrimers From Natural Amino Acids. Part II: Nonfullerene Nanotubes From Bridged Dendritic Metalloporphyrin Complexes

Author(s)

Kim, Yoonkyung

Issue Date

2001

Doctoral Committee Chair(s)

Zimmerman, Steven C.

Department of Study

Chemistry

Discipline

Chemistry

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

Chemistry, Organic

Language

eng

Abstract

"Part II. A novel strategy is developed to construct nonfullerene nanotubes through the formation of bisaxially bridged dendritic metalloporphyrin complexes and a successive application of the ""cored dendrimer"" method. Each reaction was monitored by UV-Vis spectroscopy, 1H NMR spectroscopy, MALDI-MS, and SEC. Upon core removal, average mass loss of 734 Da (tin porphyrin core) per monomeric unit was exhibited in the MALDI mass spectra for each oligomer. The cored out structure 53 was soluble in common organic solvents enabling their partial size separation by a preparative SEC. The SEC results in NMP suggested that the cross-linked oligomer 51 had an Mw of 83,790 Da (DP = 15), and the purified monomer-free cored out tube 53' had an Mw of 123,800 Da (DP = 25), using PS standards. As a preliminary attempt to obtain more reliable average MWs, SEC was calibrated with three monodisperse dendrimers, giving the average MWs of 30,490 Da for 51 and 39,660 Da for 53'."

Graduation Semester

2001

Type of Resource

text

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