Association of chlorophyll with amides on plasticized polyethylene particles. III. Unusual spectra of chlorophyll a with N-methylmyristamide
The absorption spectrum of chlorophyll a, adsorbed with the amphiphilic amide, N-methylmyristamide, to particles of polyethylene swollen with tetradecane, is unusual in that the red band apparently consists of three main components, which by Gaussian deconvolution are located at 664.5, 678 and 687 nm. The last is very narrow, with a bandwidth of only 5 to 6 nm at half maximum. At low amide concentration, the 744 nm band of chlorophyll hydrate is also observed. Room temperature fluorescence is weak, and indistinctly resolved into bands. However, on gradual cooling to 80 K, the fluorescence intensifies greatly; the spectrum can be resolved into at least eight bands, some of which can be related to room temperature absorption bands with some reliability. The circular dichroism spectrum of the red band region shows optical rotatory strength in two narrow bands at 677 and 686 nm which is enormous, compared to that of monomeric chlorophyll or even the 744 nm hydrate. It is suggested that cyclic oligomer structures, in which adjacent chlorophylls are linked through the amide group of NMMA, might be responsible for the spectral phenomena. Unsubstituted myristamide and N,N-dimethylmyristamide do not produce these narrow-banded phenomena at all.
- Research Organization:
- Charles F. Kettering Research Lab., Yellow Springs, OH (USA)
- DOE Contract Number:
- AC02-82ER12039
- OSTI ID:
- 7082652
- Report Number(s):
- DOE/ER/12039-T2-Pt.3; ON: DE83000533
- Country of Publication:
- United States
- Language:
- English
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ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
14 SOLAR ENERGY
CHLOROPHYLL
ABSORPTION SPECTRA
FLUORESCENCE
ADSORPTION
AMIDES
CHEMICAL BONDS
DICHROISM
POLYETHYLENES
SORPTIVE PROPERTIES
CARBOXYLIC ACIDS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
LUMINESCENCE
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
PHYTOCHROMES
PIGMENTS
POLYMERS
POLYOLEFINS
PORPHYRINS
SORPTION
SPECTRA
SURFACE PROPERTIES
400500* - Photochemistry
140505 - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)