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本文以二苯基苯并呋喃为发荧光的单重态氧(~1O_2)接受体,并作为与抗氧化剂(X)竞争反应中的标准物质。根据它在反应时引起的荧光强度变化,利用类似的Stern-Volmer方程式作图,从中求得各X的β值(~1O_2自行失活为基态氧的速度常数和~1O_2与X反应的速度常数kx的比值)和kx值。在选用的五类X中,以色满类的kx为最大(kx=3.78×10~8m~(-1)s~(-1));双螺色满类次之(9—10×10~7m~(-1)s~(-1));再次为对苯二酚类(6—7×10~7m~(-1)s~(-1))和双酚类(2—3×10~7m~(-1)s~(-1));苯酚类最小(5×10~6m~(-1)s~(-1))。将上述各X加入彩色相纸的品红层乳剂中进行光退色试验时,所得结果亦相一致。即kx愈大,染料影像的密度变化愈小。
In this paper, diphenylbenzofuran was used as a fluorescence acceptor of singlet oxygen (~ 1O 2) and as a standard substance in the competitive reaction with antioxidant (X). According to the change of the fluorescence intensity caused by the reaction, we use the similar Stern-Volmer equation to plot the β value of each X (the rate constants of ~ 10 O_2 self-deactivation to ground oxygen and the velocity constant of ~10 O_2 to X reaction kx ratio) and kx values. Among the five selected X, the kx of the full-color class is the largest (kx = 3.78 × 10 ~ 8m -1 s -1) ~ 7m ~ (-1) s ~ (-1)); again hydroquinone (6-7 × 10 ~ 7m -1 s -1) and bisphenol × 10 ~ 7m -1 s ~ (-1)) and phenol (5 × 10 ~ 6m -1 s -1). When each of the above-mentioned X was added to a color photographic paper, a photodecolorization test was conducted on the magenta emulsion and the results obtained were also consistent. That is, the larger the kx, the smaller the density change of the dye image.