Abstract
The bis-p-chlorocinnamate of 10,12-docosadiyn-1,22-diol (Cl-Cin-22) interacts with 60Co γ radiation to give a polydiacetylene (PDA) soluble in organic solvents. This PDA has been previously studied with respect to its optical spectroscopy and exciton binding energy. In this work, solution cast films of PDA-Cl-Cin-22 have been studied by ultraviolet photoelectron spectroscopy (UPS). The threshold solid state ionization energy of 5.9 eV is consistent with earlier UPS studies of PDA. Exposure of a Cl-Cin-22 monomer film to He I (21.2 eV radiation) initially gives a blue colored film that converts to a red film on heating, consistent with an irreversible thermochromic transition. In situ polymerization in ultrahigh vacuum of spin coated films of Cl-Cin-22 using He I (21.2 eV radiation) has been explored by recording UPS spectra as a function of exposure time, and for comparison UPS data of p-chlorocinnamic acid and bis-p-chlorotruxinic acid are also reported.
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