"Cyclic oligoketones composed of 3,3-dimethylpentane-2,4-diones showed crown ether-like alkali metal ion binding behavior with association constants up to 1.7 104 M1 in chloroform/acetonitrile (v/v, 9/1). The binding properties have been used for catalysis in the Finkelstein reaction in a low-polarity solvent. Furthermore, novel ion-binding hosts were generated by terminal functionalization of linear polyketones"
"We report the synthesis and characterization of porphyrin–corrole–porphyrin (Por-Cor-Por) hybrids directly linked at the meso–meso positions for the first time. The stability and solubility of the trimer are carefully balanced by adding electron-withdrawing substituents to the corrole ring and sterically bulky groups on the porphyrins. The new hybrids are capable of stabilizing more than one metal ion in a single molecular scaffold. The versatility of the triad has been demonstrated by successfully stabilizing homo-(Ni) and hetero-trinuclear (Ni-Cu-Ni) coordination motifs. The solid-state structure of the NiPor-CuCorPorNi hybrid was revealed by single-crystal X-ray diffraction studies. The Ni(II) porphyrins are significantly ruffled and tilted by 83 degree from the plane of corrole. The robustness of the synthesized hybrids was reflected in the electrochemical investigations and the redox behavior of the hybrids show that the oxidation processes are mostly corrole-centered. In particular it is worth noting that the Por-Cor-Por hybrid can further be manipulated due to the presence of substituent-free meso-positions on both the terminals".
"We have designed and synthesized a meso–meso linked (Cor–Por–Cor) by 2 + 1 acid catalyzed condensation reaction of 5,15-bis-formylporphyrin with 5- phenyl dipyrromethane. The photophysical properties of the hybrid has been investigated in comparison to their monomers. It is interesting to note that the higher quantum yield and life time of the hybrid in comparison with meso–meso directly linked porphyrin trimers are the significant features which indicates that the new hybrid is a potential target for various applications. The new hybrid paves the way for porphyrin systems wherein a multi-metallic mixed valence molecular scaffold is plausible. Such a system will be interesting with respect to their coordination and materials chemistry".