Iron(II) complexes of hexaphenyl(1,2,5-thia/selenadiazolo)porphyrazine: the direct replacement of Se by S in the 1,2,5-selenadiazole ring

Iron(II) complexes of hexaphenyl(1,2,5-thia/selenadiazolo)porphyrazines have been prepared as bis(pyridine) adducts [PY2Fe(XN2)PAPh(6)] (X = S, Se) from the corresponding Mg-II complexes obtained by template co-cyclotetramerization of diphenylfumarodinitrile with 1,2,5-thia/selenadiazolo-3,4-dicarbonitriles, and the unusual direct replacement of Se by S in the reaction of [Py2Fe(SeN2)PAPh(6)] with H2S has been observed.