Molecular Structure And Spectroscopic Properties Of [2,3,9,10,16,17,23,24-Octakis(3-Carboxyphenoxy)Phthalocya-Ninato-(Kn)-N- 4] (Pyridine -Kn)Zinc (Ii) Pyridine Octasolvate

The title complex, [2,3,9,10,16,17,23,24-octakis(3-carboxyphenoxy)phthalocyaninato-k N-4](pyridine-k/N)zinc(II)pyridine octasolvate abbreviated as [ZnPc(3-CO2H)(8)(Py)].8(Py) (2), has been obtained by recrystallization of [ZnPc(3-CO2H)(8)] (1) from pyridine. Molecular structure of 2 determined by X-ray crystallography exhibits the anticipated Ns square pyramidal coordination around zinc(II) ion, where the average Zn-N(Pc) and Zn-N(Py) bond lengths are 2.027(4) angstrom and 2.121(4) angstrom, respectively. The deviation of the zinc(II) ion from phthalocyanine N-4 plane is 0.417 angstrom. Eight pyridine molecules are involved in hydrogen bonding with the carboxylic acid moieties of phenoxy rings in a 1:1 Two discrete phthalocyanine molecules in a unit cell are stacked in a back-to-back fashion with an interplanar distance of 3.376 angstrom. Pyridine solutions of 1 exhibit well-resolved H-1 NMR, UV-Vis, and fluorescent spectra, suggesting that 1 exists pyridine ligated monomeric species.