Crystal structures of the methylene chloride disolvates of tetrakis(3,5-dimethoxyphenyl)porphyrin and its isotypic copper(II) and nickel(II) complexes, C52H46N4O8 center dot 2CH(2)Cl(2), Cu(C52H44N4O8) center dot 2CH(2)Cl(2), Ni(C52H44N4O8) center do ...