Boron-Oxygen Compounds

 
2B + 3/2O2  B2O3  B(OH)3
 
Boric oxide Boric acid
 
 Structure-H-bonded: planar B(O)3 unit p-bonding
 
Acidic => generates protons
 
B(OH)3 + 2H2O  B(OH)4- + H3O+
 
cf. HCl + H2O  Cl- + H3O+
 
NB . 
 
B2O3 + metal oxide  Borates (Again acid properties)
 
 
Structures
 
 - BO3 and tetrahedral BO4 units, no BO6 units (due to size)
 
- BO33- + H2O  B-O-B linkages
 
 
B(OH)3 + ROH  B(OR)(OH)2  B(OR)2OH, B(OR)3
 
 
Borate esters