Method and device for indicating moisture based on bis(glyoxime)-transition metal complexes

Abstract

Compositions that include bis(glyoxime)-transition metal complexes bound to metal oxide solid supports are provided. In some embodiments the compositions include nickel dimethylglyoxime and the metal oxide supports can be alumina or silica. These compositions can be used to make a colorimetric moisture-indicating sensor that changes visible reflection spectrum quantitatively and reversibly according to the amount of moisture in contact with the sensor. Also provided is a method of detecting moisture using the provided compositions.

1 . A composition comprising:
 a solid metal oxide support; and   a bis(glyoxime)-transition metal complex bound to the support.   
     
     
         2 . A composition according to  claim 1 , wherein the bis(glyoxime)-transition metal complex comprises a bis(dimethylglyoxime)-transition metal complex. 
     
     
         3 . A composition according to  claim 1 , wherein the solid metal oxide support comprises an oxide of aluminum, silicon, or a combination thereof. 
     
     
         4 . A composition according to  claim 1 , wherein the bis(glyoxime)-transition metal complex has square-planar configuration. 
     
     
         5 . A composition according to  claim 4 , wherein the transition metal in the bis(glyoxime)-transition metal complex comprises rhodium, iridium, platinum, palladium, gold, nickel, copper, or a combination thereof. 
     
     
         6 . A composition according to  claim 5 , wherein the transition metal in the bis(glyoxime)-transition metal complex comprises nickel, copper, or a combination thereof. 
     
     
         7 . A composition according to  claim 6 , wherein the bis(glyoxime)-transition metal complex comprises bis(dimethylglyoximato)-nickel (II). 
     
     
         8 . A colorimetric moisture-indicating sensor comprising:
 a solid metal oxide support; and   a bis(glyoxime)-transition metal complex bound to the support,   
       wherein the visible spectroscopic reflection spectrum of the moisture-indicating sensor changes quantitatively and reversibly according to the amount of moisture in contact with the sensor. 
     
     
         9 . A colorimetric moisture-indicating sensor according to  claim 8 , wherein the bis(glyoxime)-transition metal complex comprises a bis(dimethylglyoximato)-transition metal complex. 
     
     
         10 . A colorimetric moisture-indicating sensor according to  claim 8 , wherein the solid metal oxide comprises an oxide of aluminum, silicon, or a combination thereof. 
     
     
         11 . A colorimetric moisture-indicating sensor according to  claim 8 , wherein the bis(glyoxime)-transition metal complex has a square-planar configuration. 
     
     
         12 . A colorimetric moisture-indicating sensor according to  claim 8 , wherein the solid metal oxide support comprises aluminum or silicon and the bis(glyoxime)-transition metal complex comprises bis(dimethylglyoximato)-nickel (II). 
     
     
         13 . A colorimetric moisture-indicating sensor according to  claim 8 , wherein the amount of moisture in contact with the sensor is determined by measuring the visible spectroscopic reflection spectrum of the sensor. 
     
     
         14 . A colorimetric moisture-indicating sensor according to  claim 13 , wherein the sensor quantitatively changes reflection spectrum in the wavelength range of 460 nm to 560 nm. 
     
     
         15 . A colorimetric moisture-indicating sensor according to  claim 14 , wherein the sensor quantitatively changes Hue number. 
     
     
         16 . A method of detecting moisture comprising:
 providing a composition, the composition comprising:
 a solid metal oxide support; and 
 a bis(glyoxime)-transition metal complex bound to the support, 
   
       wherein the visible spectroscopic reflection color intensity change of the composition is quantitative and reversible according to the amount of moisture in contact with the composition; and
 exposing the composition to a moist atmosphere. 
 
     
     
         17 . A method of detecting moisture according to  claim 16 , wherein the bis(glyoxime)-transition metal complex comprises a bis(dimethylglyoxime)-transition metal complex. 
     
     
         18 . A method of detecting moisture according to  claim 16 , further comprising measuring the visible spectroscopic reflection spectrum of the composition after exposing the composition to a humid atmosphere. 
     
     
         19 . A method of detecting moisture according to  claim 16 , wherein the solid metal oxide support comprises aluminum, the bis(dimethylglyoxime)-transition metal complex comprises nickel, and the visible spectroscopic reflection color intensity change is measured by reflection spectroscopy in the wavelength range of 460 nm to 560 nm. 
     
     
         20 . A method of detecting moisture according to  claim 19 , wherein the visible reflection spectroscopic color intensity change intensity change is measure by the change in the Hue number.