Reactions
In its chemistry SeO3 generally resembles sulfur trioxide, SO3, rather than tellurium trioxide, TeO3. It is thermodynamically unstable with respect to selenium dioxide and above 185°C it begins to disproportionate:-
- SeO3 → SeO2 + 1⁄2 O2;
At 120 °C SeO3 reacts with selenium dioxide to form diselenium pentoxide, Se2O5
- SeO3 + SeO2 → Se2O5
It reacts with selenium tetrafluoride to form selenoyl fluoride, the selenium analogue of sulfuryl fluoride
- SeO3 + SeF4 → SeO2F2
As with SO3 adducts are formed with Lewis bases such as pyridine, dioxane and ether.
With lithium oxide and sodium oxide reaction in a sealed tube forms selenate(VI) compounds containing SeVIO54– and SeVIO65–:
- SeO3 + 2Li2O -> Li4SeO5 ;trigonal pyramidal ion SeVIO54– with equatorial bonds, 170.6-171.9 pm; and axial bonds longer 179.5 pm
- SeO3 + 2Na2O -> Na4SeO5 square pyramidal containing the SeVIO54–, with bond lengths ranging from range 1.729 → 1.815 pm
- 4SeO3 + 6Na2O->in Na12(SeO4)3(SeO6) containing octahedral SeVIO66–
Read more about this topic: Selenium Trioxide
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