Optical‐Limiting and Photophysical Properties of Two Soluble Chloroindium Phthalocyanines with α‐ and β‐Alkoxyl Substituents

Two soluble heavy-metal phthalocyanine derivatives, namely, tetra-a-(2-ethylbutoxy) chloroindlum phthalocyanine (α-InPcCl) and tetra-β-(2-ethylbutoxy) chloroindium phthalocyanine (β-InPcCl), were synthesized. Their optical-limiting properties in THF solution were investigated with a 532 nm nanosecond laser. The differences in the aptical-limitting properties are attributed to their different photophysical properties, α-InPcCl is superior to β-InPcCl as optical-limiting material, α substitution could be a useful factor to be considered in designing optical limiting materials based on metal phthalocyanines.