Molecular polarisability. The conformations as solutes of phenothiazine and of N-methyl- and N-phenyl-phenothiazine

Abstract

Dipole moments and molar Kerr constants are reported for phenothiazine and for N-methyl- and N-phenyl-phenothiazine in benzene solution. The experimental data are interpreted to indicate that (a) the molecules as solutes have apparent conformations defined by dihedral angles, Φ, of ca. 150°, and (b) the substituent on the nitrogen is disposed “equatorially” with respect to the central heterocyclic ring.