What are X and Y in the following reaction?

$3{ \mathrm{B}}_2{\mathrm{H}}_6+6{\mathrm{NH}}_3⟶3[\mathrm{X}{]}^{+}{\left[{\mathrm{BH}}_4\right]}^{-}\stackrel{\mathrm{\Delta }}{⟶}12{\mathrm{H}}_2+2\mathrm{Y}$

 

Diborane reacts with ammonia initially gives ${\mathrm{B}}_2{\mathrm{H}}_6.2{\mathrm{NH}}_3$ which is formulated as${\left[{\mathrm{BH}}_2{\left({\mathrm{NH}}_{3)}\right)}_2\right]}^{+}{\left[{\mathrm{BH}}_4\right]}^{-}$ and on further heating gives borazine ${\mathrm{B}}_3{\mathrm{N}}_3{\mathrm{H}}_6$ is also known as inorganic benzene