▁of ▁more ▁remote ▁electron - don ors ▁include ▁nit ro gen ▁atoms ▁that ▁can ▁lead ▁to ▁a ▁six - member d ▁ring ▁by ▁bond ing ▁to ▁the ▁lead . ▁Even ▁a ▁flu or ine ▁atom ▁on ▁a ▁remote ▁trif lu or om eth yl ▁group ▁has ▁been ▁seen ▁forming ▁a ▁coord ination ▁to ▁lead ▁in ▁[ 2 , 4 , 6 -( CF 3 ) 3 C 6 H 2 ] 2 P b . ▁ ▁Ag ost ic ▁interactions ▁ ▁Ag ost ic ▁interactions ▁have ▁also ▁been ▁shown ▁to ▁stabil ize ▁pl um by len es . ▁D FT ▁comput ations ▁on ▁the ▁comp ounds ▁[( R ( CH 3 ) 2 Si ){ ( CH 3 ) 2 P ( B H 3 )} CH ] 2 P b ▁( R   =   Me ▁or ▁Ph ) ▁found ▁that ▁ag ost ic ▁interactions ▁between ▁bond ing ▁B – H ▁orbit als ▁and ▁the ▁vac ant ▁ 6 p ▁orb ital ▁lower ed ▁the ▁energy ▁of ▁the ▁mole c ule ▁by ▁ca . ▁ 3 8   k cal   m ol − 1 ; ▁this ▁was ▁supported ▁by ▁X - ray ▁cry stal ▁structures ▁showing ▁the ▁fav ou rable ▁position ing ▁of ▁said ▁B – H ▁b onds ▁in ▁proxim ity ▁of ▁P b . ▁ ▁React ivity ▁ ▁As ▁previously ▁mentioned , ▁un st abil ized ▁pl um by len es ▁are ▁pr one ▁to ▁polym er ization ▁and ▁dis pro port ion ation , ▁and ▁pl um by