Orientation of organic, inorganic and biomolecular chromophores in aromatic carboxylic acid crystals
Abstract
Mixed crystals of aromatic carboxylic acid crystals containing organic, biomolecular and inorganic chromophores are prepared and described. Each of these chromophores recognizes specific growth sectors within these crystals during growth from solution. The chromophores were, in most cases, oriented as evident by the strong linear dichroism and/or fluorescence anisotropy. Two aromatic carboxylic acid host crystals were emphasized. The first, phthalic acid (1,2-benzenedicarboxylic acid), is shown to encapsulate a variety of azo and triarylmethane dyes, biopolymers and dichromate salts. The second, poppy acid (meconic acid, or 3-hydroxy-2,6 dicarboxy-γ-pyrone) is shown to encapsulate a number of organic dyes of various size and shape. The anisotropy of chromophore absorption or emission within these crystalline matrices is quantified by polarization spectroscopies. Orientations of these chromophores within the host crystals as well as mechanisms for mixed crystal formation and growth sector recognition are discussed.
Degree
Ph.D.
Advisors
Kahr, Purdue University.
Subject Area
Organic chemistry
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