Metal complexes of N-m-nitrobenzenesulfonylamido-meso-tetraphenyl porphyrin: M(N-NSO2(m-NO2)C6H4-tpp) (M = Zn2+, Ni2+, Cu2+) and Tl(N-NSO2(m-NO2)C6H4-tpp)(OAc) (tpp = 5, 10, 15, 20-tetraphenyl porphyrinate)

This work reports X-ray crystals of four new metal complexes with M-N-N linkages, one paramagnetic, 4-Cu2+, and three diamagnetic, 3-Ni2+, 5·CHCl3-Zn2+ and 6·CHCl3-Tl3+. The strong ion-dipole interaction between Ni2+ (E acid) and te nitroaryl group dipole rotates the NO2 group of (m-NO2)BSA closer to Ni2+ in 3-Ni2+.