Template-assisted ligand encapsulation; the impact of an unusual coordination geometry on a supramolecular pyridylphosphine-Zn(II)porphyrin assembly.
The tris(para-pyridyl)phosphine template (1) has been used in conjunction with a series of meso-substituted Zn(II)-tetraphenylporphyrins complexes (2-10) to create supramolecular encapsulated ligand assemblies via Zn-N(pyr) interactions. The structural features of supramolecular ligand 1.[2](3) have been investigated in detail using X-ray crystallography, NMR specroscopy, and UV-vis spectroscopy. The pyridylphosphine-porphyrin stoichiometry determined in solution (1:3) differs markedly with that observed in the solid state (2:5, for assembly [1](2).[2](5)). The difference originates from an unusual coordination behavior of one of the Zn centers, which is octahedrally surrounded through double axial coordination by the pyridyl groups of the two different molecules of 1.
Kleij
Arjan W
AW
Van't Hoff Institute for Molecular Sciences, University of Amsterdam, The Netherlands.
Kuil
Mark
M
Tooke
Duncan M
DM
Spek
Anthony L
AL
Reek
Joost N H
JN
D018360:Crystallography, X-Ray; D008024:Ligands; D046911:Macromolecular Substances; D008665:Metalloporphyrins / Q000737:chemistry* / Q000378:metabolism; D015394:Molecular Structure; D010720:Phosphines / Q000737:chemistry* / Q000378:metabolism; D011725:Pyridines / Q000737:chemistry; D015032:Zinc / Q000737:chemistry* / Q000378:metabolism
D008024:Ligands; D046911:Macromolecular Substances; D008665:Metalloporphyrins; D010720:Phosphines; D011725:Pyridines; D015032:Zinc; C023666:pyridine