Abstract
The substituent effects on the singlet−triplet energy separations are explored for phosphanylnitrenes and related congeners from the Group 14 to Group 16 elements. Imine-type substituents (e.g. phosphaniminato, methyleneimine etc.) are more effective than amino groups in lowering the energy of a singlet below that of a triplet state. It is due to an effective stabilisation of the singlet and a destabilisation of the triplet.
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