Co-aggregation of two anionic azo dyestuffs at a well-defined stoichiometry.
Co-aggregation of two anionic azo dyestuffs at a well-defined stoichiometry.
复制标题
两种阴离子偶氮染料以明确的化学计量共聚集。
DOI：
10.1021/jp403985m
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
K. Huber
中科院分区：
文献类型：
--
作者：
Rolf Michels;Thomas Sinemus;J. Hoffmann;B. Brutschy;K. Huber
本工作研究了在Mg（2+）离子存在下，红色和黄色偶氮染料二元混合物形成定义明确的异质聚集体。采用静态光散射和动态光散射结合激光诱导液珠离子解吸质谱（LILBID-MS）研究了纯红色染料和纯黄色染料及其混合物在不含Mg（2+）的水溶液中的状态。这些实验表明，一旦两种染料结合，就发生分子尺度上的结构重组。红色和黄色染料的混合溶液含有胶束状的混合实体，其尺寸为几十纳米。在添加Mg（2+）后，这些胶束消失，有利于细长的异质聚集体，其通过逐步添加较小的构建单元而生长。如通过UV/维斯光谱所揭示的，在Mg（2+）的存在下由红色和黄色偶氮染料形成的杂聚集体服从1：1的两种组分的化学计量比。一种新的多角度散射仪器使我们能够第一次遵循这个聚集过程中的化学计量比的时间分辨结合静态和动态光散射，从而提供了进一步的方面的蠕虫状的性质的不断增长的heteraggregates。
The present work investigates the formation of well-defined heteroaggregates from a binary mixture of a red and a yellow azo-dyestuff in the presence of Mg(2+) ions. Combined static and dynamic light scattering together with laser induced liquid bead ion desorption mass spectrometry (LILBID-MS) has been applied to characterize the states of the pure red dye and the pure yellow dye as well as of their mixture in aqueous solution without Mg(2+). These experiments indicated that a structural reorganization on a molecular scale takes place as soon as the two dyes are combined. Solutions of the combined red and yellow dye contain micelle-like mixed entities with a size of a few tenths of nanometers. Upon the addition of Mg(2+), these micelles vanish in favor of elongated heteroaggregates, which grow by a stepwise addition of smaller building units. As unraveled by UV/vis spectroscopy, the heteroaggregates that are formed from the red and yellow azo dye in the presence of Mg(2+) obey a stoichiometric ratio of the two components of 1:1. A new multiangle scattering instrument allowed us for the first time to follow this aggregation process at the stoichiometric ratio by time-resolved combined static and dynamic light scattering, thereby providing further aspects of the worm-like nature of the growing heteroaggregates.
DOI：
10.1073/pnas.93.3.1125
发表时间：
1996-02-06
影响因子：
11.1
作者：
Lomakin, A;Chung, DS;Teplow, DB
通讯作者：
Teplow, DB
影响因子：
3.5
作者：
Bharne, Ashish P.;Borkar, Chandrashekhar D.;Kokare, Dadasaheb M.
通讯作者：
Kokare, Dadasaheb M.