Imaging Science and Photochemistry ›› 1989, Vol. 7 ›› Issue (3): 1-6.DOI: 10.7517/j.issn.1674-0475.1989.03.1
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CHEN ZHE-LIU, ZHU ZHENG-HUA, CHEN KONG-CHANG, HE YUE-HUA
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Abstract: Seven pyrazolone colour couplers were prepared and their photographic activities A were determined. SCF-PPP-MO was used to calculate the electron densities, localization energies and superdelocalizabilities at the coupling sites of colour couplers. The calculated electron densities Qr, were found to correlate lnA by a linear equation: lnA=15.97Qr-18.03 (n=6,r=0.95) Since A should be directly proportional to k2, the specific rate constant of colour coupling, Qr is related to coulombic attraction between reacting molecules. The coupling reaction of pyrazolone is an electrostatic controlled reaction.
Key words: colour coupler, pyrazolonc, photographic activity, SCF-PPP-MO
CHEN ZHE-LIU, ZHU ZHENG-HUA, CHEN KONG-CHANG, HE YUE-HUA. THE RELATION BETWEEN PHOTOGRAPHIC ACTIVITIES AND STRUCTURES OF PYRAZOLONE COLOUR COUPLERS[J]. Imaging Science and Photochemistry, 1989, 7(3): 1-6.
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