Blank M, Soo L M, Wassermann H N, Erlanger B F
Science. 1981 Oct 2;214(4516):70-2. doi: 10.1126/science.7280680.
A photoregulated chelating agent has been synthesized. It is a photochromic azobenzene compound containing two iminodiacetic acid groups and can exists as cis and trans stereoisomers. The planar trans isomer does not bind zinc ions. On exposure to light of 320 nanometers, the trans isomer is converted to a nonplanar cis isomer, which, because of cooperativity between the two iminodiacetic acid groups, binds zinc ions with the value of the binding constant estimated to be 1.1 x 10(5) +/- 9.2 x 10(5) liters per mole at a ratio of one molecule of chelating agent to one zinc ion. The interconversion of the cis and trans isomers is reversible, suggesting possible application of this class of compounds as photoresponsive ion pumps.
一种光调节螯合剂已被合成。它是一种含有两个亚氨基二乙酸基团的光致变色偶氮苯化合物，能以顺式和反式立体异构体形式存在。平面反式异构体不结合锌离子。在320纳米光照下，反式异构体转变为非平面顺式异构体，由于两个亚氨基二乙酸基团之间的协同作用，该顺式异构体以螯合剂分子与锌离子1:1的比例结合锌离子，结合常数估计为1.1×10⁵±9.2×10⁵升/摩尔。顺式和反式异构体的相互转化是可逆的，这表明这类化合物可能作为光响应离子泵得到应用。
