The crystal structure of [Ni(TAAB)(py);](BF;);,where TAAB is thetetradentate macrocyclic ligand tetrabenzo[b,f,j,n] [1,5,9,13]tetraazacyclohexadecine,has been determined from X-ray diffraction analysis.The crys.tai beiongs to monoclinic,space group P2;/n with cell parameters