Langmuir films of ytterbium and samarium phthalocyanines

Monolayer characteristics of ytterbium and samarium phthalocyanines (YbPc 2 and SmPc 2 ) have been investigated by surface pressure and surface potential isotherms. It has been shown that the metal ion in the phthalocyanines can cause marked differences in the monolayer properties. The different monolayer characteristics of YbPc 2 and SmPc 2 may possibly be ascribed to either the extent of aggregation or the symmetry of the metallophthalocyanines.