Study On The Preparations And Properties Of Fluorescent And Temperature-dependent Nitrogen-containing Compounds

In resent years, a category of nitrogen-containing fluorescent materials which without traditional fluorescent groups were found that can demonstrate luminescence which have attracted much attention of researchers interests. And it has very broad application prospects in biomedical fields. However, a successful explanation has not been achieved to clearly elucidate the luminescent mechanism. Thus,amine-containing small molecular is convenient for preparation and it has good solubility in both polar and nonpolar solvents which provide an effectively way for researching. Studying on luminescent mechanism of amine-containing small molecular can help us know more about this kind of nitrogen-containing fluorescent materials and it has great significance.In this paper, we adopted tri-n-butylamine as an example to explore the fundamental fluorescent behaviors of amine-containing small molecular in different kinds of solvents. We suggest that there are two factors to give a combine impact on the intrinsic fluorescence, that is, one is solvation effect, and the other is solvent-induced aggregation. The different micro-environment of fluorescent center lead to the difference between fluorescent properties. We suggest that the aggregation of amine-containing groups have a great influence on the changes of fluorescent center.In addition, the products that Triethylenetetramine reacted with Glutaric dialdehyde are sensitive to temperature. When the temperature get a raise to an appropriate condition, the clarity solution trend to turn turbidity. On the contrary,when the temperature have a reduce to some condition,it trends to become clarity. It is a process of reversible at a certain range. Through our experiment, we conclude that the particle size of the product get a raise when the temperature lift. Under same temperature condition, with the concentration of the solution decrease, its size get a decrease. As the proportion of TETA increased, the temperature of getting turbidity increased. This paper measured the influence of time, ratio and concentration onfluorescent properties. We found three fluorescent peaks appeared during dilution and two of the three peaks position fixed. We suggested that amine-containing groups act as the main role contact to fluorescent groups. The emission wavelength of the third peak had a blue shift during its dilution which suggested that different aggregation of amine-containing groups lead to different fluorescent properties.