The crystal structure of (hydrogen ethylenediaminetetraacetato) aquoferrate(III) and gallate(III)

The crystal structure of (hydrogen ethylenediaminetetraacetato)-aquoferrate(III) has been determined using three dimensional x-ray diffraction data. There are four molecules in the monoclinic unit cell, spacegroup P21/c with dimensions, a = 8.36, b = 8.94, c = 17.83 Å, β = 99.5°. In the structure, the ethylenediaminetetraaceticacid group wraps itself around the iron atom as a pentadentate ligand, leaving one uncomplexed carboxylic acid. A water molecule completes the octahedral co-ordination sphere currounding the metal, (FeN, 2.22; FeO, 1.98; FeH2O, 2.07 Å). The crystal structure of isomorphous (hydrogen ethylenediaminetetraacetato)-aquogallate(III) has also been refined (a = 8.35, b = 8.84, c = 17.56 Å, β = 99.9°, P21/c Z = 4, GaN, 2.14; GaO, 1.95; GaH2O, 1.95 Å)

The crystal structure of an octaethylporphyrin dimer bridged by a 2, 5-disubstituted furan

The crystal structure of a dimer of 2, 3, 7, 8, 12, 13, 17, 18-octaethylporphyrin, joined at the meso-positions through a 2, 5-disubstituted furan, shows the furan ring to be almost orthogonal to the porphyrin mean planes. Bond angles and distances in the furan ring and adjacent parts of the porphyrin rings are distorted due to steric congestion involving the ethyl substituents. The dizinc complex of this bis(porphyrinyl)furan exhibits a split Soret band in its electronic spectrum; this indicates strong excitonic coupling between the porphyrin chromophores