Award Date

8-1-2015

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Chemistry and Biochemistry

First Committee Member

Pradip K. Bhowmik

Second Committee Member

Vernon F. Hodge

Third Committee Member

Dong-Chan Lee

Fourth Committee Member

Laxmi P. Gewali

Number of Pages

84

Abstract

Pyrylium salts are an important class of cationic organic molecules that exhibit good absorption, fluorescence, and photo-induced electron transfer properties. They can also function as precursors for synthesis of different heterocyclic organic molecules such as furan, pyridine, pyridinium salt, and betaine dyes. This thesis describes versatile methods of synthesis for a series of 2,4,6-triarylsubstitued pyrylium tosylates with different substituents by using p-toluenesulfonic acid monohydrate instead of conventional acid catalysts including perchloric acid or boron trifluoride diethyl etherate that accompany explosion danger and difficult storage problem, respectively. The chemical structures were established by 1H and 13C NMR spectroscopic techniques and elemental analysis, and their thermal properties were studied by thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC). Their optical properties including quantum efficiency were measured by UV-Vis and photoluminescent spectroscopy, and they emitted blue and green color depending on the substituents in 2- and 6-positions of phenyl groups.

Keywords

ionic salt; photoluminescent salt; Pyrylium salt

Disciplines

Chemistry

Language

English


Included in

Chemistry Commons

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