Peripherally η1-platinated organometallic porphyrins as building blocks for multiporphyrin arrays
The modification of peripherally metalated meso-?(1)-platiniometalloporphyrins, such as trans-[PtBr(NiDAPP)(PPh3)(2)] (H(2)DAPP = 5-phenyl-10,20-bis(3',5'-di-tert-butylphenyl)porphyrin), leads to the analogous platinum(II) nitrato and triflato electrophiles in almost quantitative yields. Self-assembly reactions of these meso-platinioporphyrin tectons with pyridine, 4,4'-bipyridine, or various meso-4-pyridylporphyrins in chloroform generate new multicomponent organometallic porphyrin arrays containing up to five porphyrin units. These new types of supramolecular arrays are formed exclusively in high yields and are stable in solution or in the solid state for extended periods. They were characterized by multinuclear NMR and UV-visible spectroscopy as well as high-resolution electrospray ionization mass spectrometry.