Activating Multistep Charge-Transfer Processes in Fullerene−Subphthalocyanine−Ferrocene Molecular Hybrids as a Function of π−π Orbital Overlap

On the relative stability of self-assembled metallosupramolecular subphthalocyanine capsules determined by ESI-Q-TOF tandem mass spectrometry

A comparative study of the relative stability of subphthalocyanine metallosupramolecular capsules bearing different metals and ligands has been carried out by electrospray ionization quadrupole time-of-flight tandem mass spectrometry experiments. The results highlight the trends in the strength of metal-nitrogen bonds as well as the 'trans effect' of certain ligands.

Photoinduced charge transfer in short-distance ferrocenylsubphthalocyanine dyads

Two new ferrocenylsubphthalocyanine dyads with ferrocenylmethoxide (2) and ferrocenecarboxylate (3) substituents directly attached to the subphthalocyanine ligand via the axial position have been prepared and characterized using NMR, UV-vis, and magnetic circular dichroism (MCD) spectroscopies as well as X-ray crystallography. The redox properties of the ferrocenyl-containing dyads 2 and 3 were investigated using the cyclic voltammetry (CV) approach and compared to those of the parent subphthalocyanine 1. CV data reveal that the first reversible oxidation is ferrocene-centered, while the second oxidation and the first reduction are localized on the subphthalocyanine ligand. The electronic structures and nature of the optical bands observed in the UV-vis and MCD spectra of all target compounds were investigated by a density functional theory polarized continuum model (DFT-PCM) and time-dependent (TD)DFT-PCM approaches. It has been found that in both dyads the highest occupied molecular orbital (HOMO) to HOMO-2 are ferrocene-centered molecular orbitals, while HOMO-3 as well as lowest unoccupied molecular orbital (LUMO) and LUMO+1 are localized on the subphthalocyanine ligand. TDDFT-PCM data on complexes 1-3 are consistent with the experimental observations, which indicate the dominance of π-π* transitions in the UV-vis spectra of 1-3. The excited-state dynamics of the dyads 2 and 3 were investigated using time-correlated single photon counting, which indicates that fluorescence quenching is more efficient in dyad 3 compared to dyad 2. These fluorescence lifetime measurements were interpreted on the basis of DFT-PCM calculations.

Synthesis of subphthalocyanines as probes for the accessibility of silica nanochannels

The synthesis of a new subphthalocyanine is reported. Its structural and photophysical properties are ideal for probing the accessibility of arrays of silica nanochannels.

A room-temperature fluorescence study of organofullerenes: cis-1 bisadduct with unusual blue-shifted emissions

C(60) derivatives have shown enhanced fluorescent emissions with respect to C(60) due to the lowering of molecular symmetry and have demonstrated promising potentials as novel organoelectronic materials for application in light-emitting diodes. Previous work has indicated that the fluorescent properties of functionalized C(60) are mainly affected by the addition patterns, rather than the nature of addends. However, no report on the fluorescence of C(60)cis-1 bisadducts, one of the most favorable types of C(60) bisadducts, has appeared up to date. Herein, the fluorescent properties of two structurally related C(60)cis-1 bisadducts of fullerooxazolines, 1 and 2, are examined at room temperature. It shows that a significant difference exists for the fluorescent spectra of 1 and 2, where 1 displays a rather strong unusual blue-shifted emission band, even though the two compounds have the same addition pattern. Monoadducts bearing individual addends of 1 and 2, along with 1a and 1b, which have one PhCD(2)- positioned either next to the C(60)-N or C(60)-O bond, are also examined in order to gain a better understanding of such difference. The results indicate that the unusual blue-shifted emissions for 1 are likely to originate from the vibrational interactions of the addends, suggesting that the fluorescent emissions of C(60) derivatives can be tuned not only by the addition patterns, but also by the nature of the adducts. Density functional theory and time-dependent density functional theory calculations are performed to rationalize the experimental observations.