Concomitant polymorphism in 1,2-bis(9-anthryl)acetylene

Author (Your Name)

Rebecca Goldstein, Colby College

Date of Award

2007

Document Type

Honors Thesis (Open Access)

Department

Colby College. Chemistry Dept.

Advisor(s)

Dasan M. Thamattoor

Second Advisor

Jeffrey L. Katz

Abstract

This thesis details the serendipitous discovery of the phenomenon of concomitant conformational polymorphism found to exist in 1,2-bis(9-anthryl)acerylene. 1,2-bis(9anthryl)acetylene is a previously published molecule. However, the published crystal structure showed the molecule to be completely planar, and to crystallize in the form of orange needles. While this form of the crystal was indeed found during the synthesis of 1,2-bis(9anthryl)acetylene, a new polymorph, crystallizing as yellow prisms, was also discovered. This yellow polymorph was found by X-ray crystallography to be monoclinic with an angle of 66.7 between the anthracene planes. The planar polymorph 1,2-bis(9-anthryl)acetylene was also found by X-ray crystallography to have different crystal structure data than that of the published structure. Naphthalene and quinoline analogs of 1,2-bis(9-anthryl)acetylene were also prepared, and their crystal structures are currently pending.

Keywords

Polymorphism (Crystallography), Molecular crystals

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