MOLECULAR DESIGN, CHARACTERIZATION, AND APPLICATION OF MULTIINFORMATION DYES FOR MULTIDIMENSIONAL OPTICAL CHEMICAL SENSINGS - 2 - PREPARATION OF THE OPTICAL SENSING MEMBRANES FOR THE SIMULTANEOUS MEASUREMENTS OF PH AND WATER-CONTENT IN ORGANIC MEDIA

Optical chemical sensing of pH and water content in organic solvents i s proposed, using multiinformation dyes (MIDs) based on the support ma trixes for the dyes, In this investigation, four kinds of merocyanine- type dyes having a polymerizable olefin unit as the MIDs were synthesi zed, These dyes were copolymerized with hydrophilic monomer molecules to obtain dye-immobilized optical chemical sensor (optode) membranes, In this case, selection of the monomer molecule gave optode membranes having different color change properties, because different monomer mo lecules provided different chemical environments around the immobilize d dye. These optode membranes were used for the measurement of pH and water content in organic solvents, These membranes offered two-dimensi onal sensing information in one spectrum when they were employed for w ater content sensing in organic solvents, in which the maximum wavelen gth represents the water content and the absorbance at this wavelength represents the pH of the water present. These polymer membranes have a long lifetime, which can be adequate for practical use.