HETEROCYCLIC-DERIVATIVES OF LONG-CHAIN DIACETYLENIC ACIDS

Acyl derivatives of 2-aminopyridine, 2-aminopyrimidine, 4-amino-2,2,6, 6-tetramethyl-piperidine-1-oxyl, and 4-hydroxy-2,2,6,6-tetramethylpipe ridine-1-oxyl were obtained from long-chain diacetylenic acyl chloride s and the corresponding heterocyclic compounds. Spreading isotherms of monolayers on a water surface show that lengthening of the hydrocarbo n chain and replacement of the pyridyl groups in these compounds by th e more hydrophilic pyrimidyl groups render the films more condensed. L ong-chain acyl derivatives of nitroxyl radicals form monolayers posses ing a low collapse pressure. ESR spectra of Langmuir-Blodgett films of these radicals before and after photopolymerization were recorded.