Electrochemical (polarographic, cyclic voltammetric, and coulometric) and coordination behaviour of several symmetrically and unsymmetrically substituted phosphiniminocyclotrithiazenes have been studied. Polarograms of R3PN-S3N3 (R= C6H5, p-ClC6H4, p-H3CC6H4, and (OC4H8N)), Ph2 (OC4H8N) PN-S3N3, and Ph (OC4H8N) 2PN- S3N3 give two cathodic waves. Cyclic voltammograms of Ph3PN-S3N3 (1) and (OC4H8N) ...