“…4 We have previously reported that benzyl isocyanide (BzNC) complexes of ferrous phthalocyanine are photochromic. 5 We have now investigated several macrocyclic complexes of iron including ferrous phthalocyanine5,6, ferrous 2,3,9,10-tetramethyl-1,4,8,11 -tetraazacyclotetradeca-1,3,8,10-tetraene (Fe(TIM)),7•8 and ferrous bis(dimethylglyoxime).9 All of these systems undergo a photochromic reaction based on the shift of the equilibrium…”