Association of chlorophyll with amides on plasticized polyethylene particles. II. The isomeric N-(pyridyl)myristamides
When chlorophyll, together with certain other amphiphilic substances, is adsorbed to particles of polyethylene plasticized by incorporation of tetradecane, it is maintained in monomeric or oligomeric forms with characteristic absorption and fluorescence spectra. The present work describes the properties of chlorophyll a on such particles in the presence of the three isomeric N-(pyridyl)myristamides, and of the similarly shaped but not basic compound myristanilide, in an effort to ascertain the structural factors governing associations of these species. Absorption and fluorescence spectra at room temperature are resolved into minimal sets of Gaussian components, and relations between the component sets are proposed. The positions of the component bands and their relative abundance are characteristic of the amide used. The 3- and 4-pyridyl isomers bind more strongly to chlorophyll, probably by ligation of the pyridine nitrogen to Mg of the pigment. The 2-pyridyl isomer and myristanilide bind more weakly, probably through the amide carbonyl group. The association of chlorophyll into species with characteristic absorption and fluorescence bands is promoted more strongly by the 3- and 4-isomers than by the 2-isomer and myristanilide, and probably involves hydrogen bonding to chlorophyll carbonyl groups. A possible manner of association of chlorophyll in the presence of N,N-dimethylmyristamide is also presented. By way of comparison, chlorophyll adsorbed with dodecylpyridinium bromide, which lacks a nucleophilic function, is mainly in the microcrystalline hydrate form absorbing near 740 nm.
- Research Organization:
- Charles F. Kettering Research Lab., Yellow Springs, OH (USA)
- DOE Contract Number:
- AC02-82ER12039
- OSTI ID:
- 6739105
- Report Number(s):
- DOE/ER/12039-T2-Pt.2; ON: DE83000348
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
14 SOLAR ENERGY
AMIDES
CHEMICAL BONDS
SORPTIVE PROPERTIES
CHLOROPHYLL
ADSORPTION
ABSORPTION SPECTRA
FLUORESCENCE
ISOMERS
MAGNESIUM
NITROGEN
PHOTOSYNTHESIS
PIGMENTS
ALKALINE EARTH METALS
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
ELEMENTS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
LUMINESCENCE
METALS
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHYTOCHROMES
PORPHYRINS
SORPTION
SPECTRA
SURFACE PROPERTIES
SYNTHESIS
400500* - Photochemistry
140505 - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)