Division of Chemistry, Graduate School of Science,
Hokkaido University
Analytical Chemistry Laboratory focuses on the research subjects related to “photon” on the basis of various photochemical/photophysical techniques represented by laser spectroscopy and microanalytical (absorption, emission, Raman, and electrochemistry) techniques as well as by an optical trapping technique for single microparticles. Main topics of the research are as follows.

We are studying optical trapping – microspectroscopy of single microparticles in solution (i.e., colloidal particles) as well as in air (i.e., aerosol particles). Colloidal microparticles can be freely manipulated by a focused laser beam and individual particles can be analyzed by microanalytical techniques developed in our research group: absorption, emission, Raman, and/or electrochemistry. The particular techniques have been successfully applied to reveal the dynamics of the ion-exchange processes in single microparticles and the mass transfer dynamics at single picoliter oil-droplets/water interface as well as to demonstrate the freezing processes of single super-cooled water droplets in air.

Optical trapping – microspectroscopy
Optical trapping of a single aerosol water-droplet in air and experimental demonstration of formation of a super-cooled water droplet at –50 ºC.

We are now focusing our study on the photophysical properties of triarylborane derivatives as well as transition metal complxes having a triarylborane unit(s) at the periphery of a π-chromophoric ligand(s). Triarylborane derivatives show very characteristic excited state and an excited electron of the derivative sit more or less on the vacant p-orbital on the boron atom, resulting in sometimes large solvatochromic fluorescence shift. Transition metal complexes having a triarylborane unit(s) also exhibit unique spectroscopic, photophysical, and electrochemical characteristics.
Fluorescence solvatochromic shift of tris{[p-(N,N-dimethylamino)phenylethynyl]duryl}borane. Transition metal complexes having a triarylborane unit(s) developed in our research group.

To Top

Copyright (C) Kitamura Lab All Rights Reserved