“…We first prepared two tetraanhydride phthalocyanines, H 2 Pc [29,30] and NiPc [31], through modified literature procedures (Scheme 1). The synthesis of H 2 Pc started with the cyclotetramerization of 1,2,4,5-tetracyanobenzene to give 2,3,9,10, 16,17,24,25-octakis(cyano)phthalocyanine 2 in 74% yield (Scheme 1).…”