LuPc2 is a double-decker sandwich compound consisting of a Lu3+ ion coordinated to two the conjugate base of two phthalocyanines.

[3] The complex features a non-innocent ligand, in the sense that the macrocycles carry an extra electron.

[4] It is a free radical[1] with the unpaired electron sitting in a half-filled molecular orbital between the highest occupied and lowest unoccupied orbitals, allowing its electronic properties to be finely tuned.

[3] LuPc2, along with many substituted derivatives like the alkoxy-methyl derivative Lu[(C8H17OCH2)8Pc]2, can be deposited as a thin film with intrinsic semiconductor properties;[4] said properties arise due to its radical nature[1] and its low reduction potential compared to other metal phthalocyanines.

[4] LuPc2 and other lanthanide phthalocyanines are of interest in the development of organic thin-film field-effect transistors.