MOLECULAR-STRUCTURE AND INTERMOLECULAR ORGANIZATION IN THE CRYSTALLINE-1 2-COMPLEX OF ZN(II)-TETRA(3-HYDROXYPHENYL)PORPHYRIN WITH DIMETHYLSULFOXIDE/

Zn (II)-tetra(3-hydroxyphenyl)porphyrin (C44H28N4O4Zn) was obtained as solvate (1:2) by recrystallization of the commercially available meta lloporphyrin derivative from dimethylsulphoxide (DMSO). The crystals a re monoclinic, space group C2/c, with a = 1883.9(4) pm, b = 1200.9(2) pm, c = 2084.6(5) pm and beta = 117.45(2)degrees. They consist of five -coordinated squarepyramidal metalloporphyrin units, involving one DMS O ligand at the axial position. These units are cross-linked in the la ttice by an extensive network of hydrogen bonds. The second molecule o f the DMSO approaches the other side of the porphyrin core. It is not linked to the metal center, but takes part in H-bonding interactions w ith adjacent porphyrin molecules. The 1:2 porphyrin-DMSO clusters are orientationally disordered in the crystal lattice.