A compound comprising a tetrahalobenzamidazolebenzene or a bis(tetrahalophenyl)biphenylbisimidazole of the alternative following formulas or dimers thereof
wherein each of R
1
, R
2
, R
3
, R
4
, and R
5
are the same or different and are independently selected from the group comprising hydrogen, alkyl, aryl, and halogen.