why bcl3 does not dimerise? Is it due to the absence of d orbital in Boron?

Boron is an electron deficient element and the absence of d orbital prevent the dimerisation. As well as the steric effect occur by chlorine atom. That is the smaller B cann't accommodate the Cl atom.  But at very low temperature the dimerisation of BCl3 occur. 
But BH3 dimerise due to the smaller H atom. 

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