1,3-Diisonitrosoacetone and 4, 4^l-Bis (Diethylamino) Benzophenone Oxime as Methanesulfonyl Chloride Vapor-Sensing Coatings for Optical Based Microsensors

Abstract

The chromogenic detector reagents 1, 3-diisonitrosoacetone (DIA) and 4, 4^l-bis (diethylamino)benzophenone oxime (EMKO) have been studied as solid-state coatings for sensing methanesulfonyl chloride vapor. The strength of the optical detection signals produced on contact of the coatings with methanesulfonyl chloride vapor are strongly affected by the composition of the solid reaction support; silica is the preferred support for coatings made with either reagent. When monitored with a fiber-optic spectrophotorneter, coatings made with DIA and EMKO are capable of sensing rnethanesulfonyl chloride vapor down to the low pprn level. At 25°C the DIA coatings are stable for up to five days while the EMKO coatings are stable for less than one day.

Key Words:

• 1, 3-diisonitrosoacetone
• 4, 4′bis (diethylamino)benzophenone oxime
• methanesulfonyl chloride
• solid-state
• microsensor coating
• silica gel
• chromogenic
• vapor detection