Silanol compound and method for producing silanol compound

Abstract

The present invention provides a method for producing a silanol compound capable of efficiently producing a silanol compound. The method for producing a silanol compound includes a proton exchange step of forming a silanol compound having a structure represented by following formula (c) by reacting a silicate having a structure represented by following formula (a) with an acidic compound having an acid dissociation constant pK a of −1 to 20 in dimethyl sulfoxide (DMSO). (In formula (a), Q i+ represents an i-valent cation and i represents an integer of 1 to 4).

1 . A method for producing a silanol compound, comprising a proton exchange step of forming a silanol compound having a structure represented by following formula (c) by reacting a silicate having a structure represented by following formula (a) with an acidic compound having an acid dissociation constant pK a  of −1 to 20 in dimethyl sulfoxide (DMSO): 
       
         
           
           
               
               
           
         
         wherein Q i+  represents an i-valent cation and i represents an integer of 1 to 4. 
       
     
     
         2 . The method for producing a silanol compound according to  claim 1 , wherein the acid dissociation constant pK a  in dimethyl sulfoxide (DMSO) of the acidic compound is 12.6 or less. 
     
     
         3 . The method for producing a silanol compound according to  claim 1 , wherein the acidic compound is an inorganic acid. 
     
     
         4 . The method for producing a silanol compound according to  claim 3 , wherein the inorganic acid is nitric acid or sulfuric acid. 
     
     
         5 . The method for producing a silanol compound according to  claim 1 , wherein the acidic compound is at least one selected from the group consisting of acetic acid and compounds having a structure represented by any of the following formulas (b-1) to (b-5): 
       
         
           
           
               
               
           
         
         wherein each X independently represents an oxygen atom, a sulfur atom, or an amino group (—NR 3 —) and each R 1  and R 2  independently represents a hydrogen atom or a hydrocarbon group haying 1 to 14 carbon atoms. 
       
     
     
         6 . The method for producing a silanol compound according to  claim 5 , wherein the acidic compound is a resin having at least one structure selected from the group consisting of the structures represented by formulas (b-2) to (b-5). 
     
     
         7 . The method for producing a silanol compound according to  claim 1 , wherein the proton exchange step is performed in at least one liquid selected from the group consisting of water, an ether liquid, an alcohol liquid, an amide liquid, an ester liquid, a halogen liquid, and an aprotic polar liquid. 
     
     
         8 . The method for producing a silanol compound according to  claim 1 , further comprising an ammonium salt addition step of adding an ammonium salt to a product obtained in the proton exchange step. 
     
     
         9 . The method for producing a silanol compound according to  claim 1 , further comprising a freeze-drying step of freezing a product obtained in the proton exchange step or a product obtained in the ammonium salt addition step and exposing the product to reduced pressure. 
     
     
         10 . The method for producing a silanol compound according to  claim 1 , further comprising a crystallization step of precipitating crystals from a product obtained in the proton exchange step or a product obtained in the ammonium salt addition step by a poor solvent method or an evaporation method. 
     
     
         11 . A silanol compound represented by following formula (F): 
       
         
           
           
               
               
           
         
         wherein n represents an integer of 1 to 3. 
       
     
     
         12 . A solid composition comprising the silanol compound according to  claim 11 . 
     
     
         13 . A composition comprising 30% by mass or more of the silanol compound according to  claim 11 . 
     
     
         14 . A composition comprising 65% by mass or more of the silanol compound according to  claim 11 . 
     
     
         15 . A composition having a crystal structure formed with the silanol compound according to  claim 11  and an amide compound. 
     
     
         16 . A dehydrated condensation product of the silanol compound according to  claim 11 . 
     
     
         17 . The method for producing a silanol compound according to  claim 6 , wherein the proton exchange step is performed in at least one liquid selected from the group consisting of water, an ether liquid, an alcohol liquid, an amide liquid, an ester liquid, a halogen liquid, and an aprotic polar liquid. 
     
     
         18 . The method for producing a silanol compound according to  claim 17 , further comprising an ammonium salt addition step of adding an ammonium salt to a product obtained in the proton exchange step. 
     
     
         19 . The method for producing a silanol compound according to  claim 7 , further comprising an ammonium salt addition step of adding an ammonium salt to a product obtained in the proton exchange step.