Abstract
The title compound, [Zn(C72H44N4O8)(C4H10N2)] or [Zn(TPBP)(pipz] (where TPBP and pipz are 5,10,15,20-tetra-kis-[4-(benzo-yloxy)phen-yl]porphyrinato and piperazine ligands respectively), features a distorted square-pyramidal coordin-ation geometry about the central Zn(II) atom. This central atom is chelated by the four N atoms of the porphyrinate anion and further coordinated by a nitro-gen atom of the piperazine axial ligand, which adopts a chair confirmation. The average Zn-N(pyrrole) bond length is 2.078 (7) Å and the Zn- N(pipz) bond length is 2.1274 (19) Å. The zinc cation is displaced by 0.4365 (4) Å from the N4C20 mean plane of the porphyrinate anion toward the piperazine axial ligand. This porphyrinate macrocycle exhibits major saddle and moderate ruffling deformations. In the crystal, the supra-molecular structure is made by parallel pairs of layers along (100), with an inter-layer distance of 4.100 Å while the distance between two pairs of layers is 4.047 Å. A region of electron density was treated with the SQUEEZE [Spek (2015 ▸). Acta Cryst. C71, 9-18] procedure in PLATON following unsuccessful attempts to model it as being part of disordered n-hexane solvent and water mol-ecules. The given chemical formula and other crystal data do not take into account these solvent mol-ecules.
Highlights
TPBP and pipz are 5,10,15,20-tetrakis[4-(benzoyloxy)phenyl]porphyrinato and piperazine ligands respectively), features a distorted square-pyramidal coordination geometry about the central ZnII atom. This central atom is chelated by the four N atoms of the porphyrinate anion and further coordinated by a nitrogen atom of the piperazine axial ligand, which adopts a chair confirmation
Zinc porphyrin complexes provide simpler systems than those of iron, cobalt, or other d transition metals to evaluate the influence of a wide range of different ligands on the spectroscopic and structural properties of complexed porphyrins
To date no zinc–piperazine porphyrin structure has been reported in the literature
Summary
The ZnII ion is one of the most prevalent metal ions as the metal center of a metalloporphyrin. Zinc porphyrin complexes provide simpler systems than those of iron, cobalt, or other d transition metals to evaluate the influence of a wide range of different ligands on the spectroscopic and structural properties of complexed porphyrins. The metal ion is unambiguously in the +II oxidation state; in most cases, fourcoordinate (porphyrinato) zinc complexes will accept one axial ligand to form complexes with a coordination number of five for the metal (Denden et al, 2015). Zinc porphyrins with a coordination number of six for the metal have been reported (Shukla et al, 2000; Oberda et al., 2013).
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