Structural characterization and formation mechanism of sitting-atop (SAT) complexes of 5,10,15,20-tetraphenylporphyrin with divalent metal ions. Structure of the CU(II)-SAT complex as determined by fluoroscent extended X-ray absorption fine structure

The UV-vis absorption spectra and the formation kinetics of sitting-atop (SAT) complexes (M(H(sub 2)tpp)(super 2+)) of 5,10,15,20-tetraphenylporphyrin (H2tpp) with a series of divalent metal ions (M(super 2+) = Mn(super 2+), Fe(super 2+), Co(super 2+), Ni(super 2+), Cu(super 2+), and Zn(super 2+)) in acetonitrile are examined. The subsequent formation of the corresponding metalloporphyrins by deprotonation of the SAT complex and oxidation of the M(super 2+) center, of which the dynamic behavior was significantly different for the different M(super 2+) ions was observed.