Basu Jayanta Kumar, Shannigrahi Mrinmoy, Bagchi Sanjib
Department of Chemistry, The University of Burdwan, Burdwan 713104, India.
J Phys Chem A. 2007 Aug 2;111(30):7066-72. doi: 10.1021/jp071375a. Epub 2007 Jun 29.
Electronic absorption and emission spectral characteristics of two ketocyanine dyes have been studied in solution in the presence of alkaline earth metal ions. Absorption spectral studies indicate complex formation between the ions and the dyes in the ground state. Values of the equilibrium constant and the enthalpy change characterizing dye (S0)-metal ion interaction have been determined from the absorption spectral data. In the presence of the metal ions the fluorescence spectrum of the dyes shows two bands pointing to the existence of two emitting species, viz., the solvated and the complexed dye in solution. Time-resolved studies of the dyes in solution containing the metal ions can be explained by a two-state model and indicate the presence of two emitting species in equilibrium. Values of the equilibrium constant for the interaction of metal ion and the dyes in the S1 state have also been estimated.
在碱土金属离子存在的情况下，对两种酮菁染料在溶液中的电子吸收和发射光谱特性进行了研究。吸收光谱研究表明，在基态下离子与染料之间形成了配合物。已根据吸收光谱数据确定了表征染料（S0）-金属离子相互作用的平衡常数和焓变值。在金属离子存在下，染料的荧光光谱显示出两个谱带，表明溶液中存在两种发射物种，即溶剂化染料和配合物染料。含金属离子溶液中染料的时间分辨研究可以用双态模型来解释，并表明存在处于平衡状态的两种发射物种。还估算了S1态下金属离子与染料相互作用的平衡常数。
