Picosecond-Millisecond Dynamics of Mlecular Recognition Processes

点击翻译按钮获取中文摘要

Several photochemical receptors were synthesized and their molecular or ion recognition processes were studied on the basis of steady-state and time-resolved spectroscopy.1). Ru (II) Complex Having Crown-Ether Moiety at 3, 3'-Positions of 2, 2'-Bipyridine (CE-bpy) : Ru (bpy)_2(CE-bpy) was synthesized for the first time. Upon addition of a sodium or pottasium ion, the emission spectrum of the complex varied considerably, while the absorption spectrum was almost insensitive to the ion. Emission titration by a sodium ion in acetinitrile demonstrated the association constant being 10^3 M^<-1>. Emission dynamics of the complex was also influened by the presence of the ion.2). Ru (II) Complex Having Calixarene Tetrasulfonate as Counter Cation (RuB-Calix) : Addition of calixarene tetrasulfonate into an aqueous solution of tris (, 2'-bipyridine) ruthenium (II) afforded pure RuB-Calix crystals. In solution. The emission intensity of the hybrid complex increased in the presence of a sodium, magn … More esium, or aluminum ion. In the absence of an ion, RuB and calixarene produced a hybrid complex and the excited state of RuB was quenched by the calixarene moiety. In the presence of an *n, counter cation exchange proceeds and, thus, the amount of free RuB increased. These processes were well explained by emission dynamic experiments.3). Photochemistry of Molecular Hinge : The "Molecular Hinge" first reported by Hamilton et al. was reinvestigated by absorption and fluorescence spectroscopy. Upon hudrogen bonding interaction between the molecular inge and butylthymine, both absorption and fluorescence spectra of the hinge changed dramatically. Fluorescence dynamic demonstrated static interaction between the host and guest.4). Spectroscopic Study on Hydrogen Bonding Interaction of Barbitul derivatives : Baribitul derivatives having an aromatic hydrocarbon moiety such as pyrene, anthracene, or N-ethylcarbazole were synthesized and their hydrogen bonding interaction with diaminopyridine were studied in acetonitrile and THF. Less