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- W2022673514 abstract "CH3Hg(II)OH forms complexes at pH 8 with tyrosine and with tyrosine ethyl ester (TEE) that are detected by ultraviolet difference absorption spectra. With Kf defined by CH3HgOH + HB CH3HgB + H2O, we find log Kf = 3.61 (tyrosine) and 3.36 (TEE). A heavy-atom effect is observed in frozen glasses of the complexes; this indicates a close interaction between Hg and the chromophore. No UV difference spectrum or heavy-atom effect is observed with N-acetyl tyrosine ethyl ester, indicating that complexing at the phenol O does not occur, and suggesting that binding occurs at the amine N. Zero field optically detected magnetic resonance (ODMR) measurements of the CH3Hg(II)-tyrosine triplet state give (D, E) = (0.129, 0.047) or (0.134, 0.041) cm−1 depending upon assignment of transitions. D of tyrosine is relatively unaffected, but E is reduced by CH3Hg(II) complexing. Low-temperature kinetic measurements show that the shortest lived sublevel of the complex is Tz, where z lies along the phenol long axis in tyrosine. A dominant 11.6-msec component in the 77 K decay of the phosphorescence is consistent with the individual sublevel lifetimes obtained by ODMR." @default.
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- W2022673514 date "1980-01-01" @default.
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- W2022673514 title "Triplet state properties of the methylmercury(II)-tyrosine complex" @default.
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- W2022673514 doi "https://doi.org/10.1016/s0162-0134(00)80076-8" @default.
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