Since the three-dimensional electron-accepting fullerene has been found to be an excellent building block for self-assembled supramolecular systems, we have investigated photoinduced electron transfer processes in systems with porphyrins and phthalocyanines as donors mimic natural photosynthesis. We successfully formed dyads triads via metal–ligand coordination, crown-ether inclusion, ion pairing, hydrogen-bonding, or π–π stacking interactions. Although single mode of binding gives usually...

Molecular water-oxidation catalysts can deactivate by side reactions or decompose to secondary materials over time due the harsh, oxidizing conditions required drive oxygen evolution. Distinguishing electrode surface-bound heterogeneous (such as iridium oxide) from homogeneous molecular is often difficult. Using an electrochemical quartz crystal nanobalance (EQCN), we report a method for probing electrodeposition of metal oxide precursors. previously reported [Cp*Ir(H(2)O)(3)](2+) complex,...

Abstract The electrochemical behavior of fullerene and derivatives are reviewed with special reference to their catalytic sensor applications. Recent work on carbon nanotubes, used as catalyst supports in heterogeneous catalysis development is also presented. An overview recent progress the area electrochemistry included. Several cases electrocatalytic dehalogenation alkyl halides, assisted by electrode charge transfer fullerenes, discussed. Research electrocatalysis biomolecules, such...

The first example of a working model the photosynthetic antenna-reaction center complex, constructed via self-assembled supramolecular methodology, is reported. For this, triad assembled by axially coordinating imidazole-appended fulleropyrrolidine to zinc covalently linked porphyrin−boron dipyrrin dyad. Selective excitation boron moiety in dipyrrin−zinc porphyrin dyad resulted efficient energy transfer (kENTsinglet = 9.2 × 109 s-1; ΦENTsinglet 0.83) creating singlet excited porphyrin. Upon...

Spectroscopic, redox, and photochemical behavior of self-assembled donor−acceptor dyads formed by axial coordination zinc tetraphenylporphyrin, (TPP)Zn, fulleropyrrolidine bearing either pyridine or imidazole coordinating ligands were investigated. The UV−vis, 1H NMR, ESI-mass spectral studies, as well computational revealed supramolecular 1:1 dyad formation between the electron donor [(TPP)Zn] acceptor, entities. determined constant K values followed order o-pyridyl ≪ m-pyridyl ≃ p-pyridyl...

The first example of covalently linked free-base corrole-fullerene dyads is reported. In the newly synthesized dyads, free-energy calculations performed by employing redox and singlet excited-state energy in both polar nonpolar solvents suggested possibility electron transfer from excited state corrole to fullerene entity. Accordingly, steady-state time-resolved emission studies revealed efficient fluorescence quenching entity dyads. Further involving femtosecond laser flash photolysis...

By employing well-defined self-assembly methods, a biomimetic bacterial photosynthetic reaction center complex has been constructed, and photoinduced electron transfer originating in this supramolecular donor−acceptor conjugate investigated. The model of the "special pair" donor, cofacial zinc phthalocyanine dimer, was formed via potassium ion induced dimerization 4,5,4′,5′,4′′, 5′′,4′′′,5′′′-zinc tetrakis(1,4,7,10,13-pentaoxatridecamethylene)phthalocyanine. dimer subsequently self-assembled...

The occurrence of photoinduced electron transfer in donor−acceptor self-assembled zinc naphthalocyanine (ZnNc) or porphyrin (ZnP) single-wall carbon nanotube (SWNT) nanohybrids has been demonstrated. were constructed by solubilizing nanotubes π−π stacking pyrene functionalized to bear an imidazole moiety, ImPy-SWNT. Through the use ligand soluble ImPy-SWNT, donor ZnNc and ZnP entities axially coordinated yield ZnNc−ImPy-SWNT ZnP−ImPy-SWNT nanohybrids. thus obtained fully characterized using...

Anion binding has emerged as an attractive strategy to construct supramolecular electron donor-acceptor complexes. In recent years, the level of sophistication in design these systems advanced point where it is possible create ensembles that mimic key aspects photoinduced electron-transfer events operative photosynthetic reaction centre. Although anion a reversible process, kinetic studies on and dissociation processes, well back reactions complexes formed by binding, have revealed transfer...

We have constructed supramolecular solar cells composed of a series porphyrin–peptide oligomers [porphyrin functionalized α-polypeptides, P(H2P)n or P(ZnP)n (n = 1, 2, 4, 8, 16)], and fullerenes assembled on nanostructured SnO2 electrode using an electrophoretic deposition method. Remarkable enhancement in the photoelectrochemical performance as well broader photoresponse visible near-infrared regions is seen with increasing number porphyrin units α-polypeptide structures. Formation clusters...

This review article highlights the recent progress made in design and study of self-assembled supramolecular architectures based on tetrapyrrole macrocycles as donors, fullerene carbon nanotubes electron acceptors for energy transfer applications solution. The remarkable features utilized biomimetic organization principles viz., hydrogen bonding, π–π stacking, metal-mediated complexation, electrostatic attraction governing stability geometry nanohybrids, their significance controlling...

A 'molecular clip' featuring a near-IR emitting fluorophore, BF(2)-chelated tetraarylazadipyrromethane (aza-BODIPY) covalently linked to two porphyrins (MP, M = 2H or Zn) has been newly synthesized host three-dimensional electron acceptor fullerene via 'two-point' metal-ligand axial coordination. Efficient singlet-singlet excitation transfer from (1)ZnP* aza-BODIPY was witnessed in the dyad and triad nonpolar less polar solvents, such as toluene o-dichlorobenzene, however, additional...

Single-wall carbon nanotube (SWNT)-based supramolecular nanoarchitectures constructed using photosensitizing donor and acceptor molecules reveal efficient photoinduced charge separation, thus carrying out the role of functional materials desired for light-energy-harvesting photovoltaic cells development novel photocatalysts. Various self-assembly strategies based on SWNT−pyrene π−π interaction are developed in a search double-decker SWNT-based nanohybrids revealing better photochemical,...

The effect of the orientation porphyrin sensitizer onto TiO2 surface on performance dye-sensitized solar cells (DSSCs) is reported. Free-base and zinc porphyrins bearing a carboxyl anchoring group at para, meta, or ortho positions one meso-phenyl rings were synthesized for application in Grätzel-type photoelectrochemical cells. remainder was substituted with alkyl chains different length to visualize any aggregation effects. Absorption fluorescence studies performed characterize observe...

Water into oxygen: Mono-iridium complexes (see picture; L=PO3H2 or COOH) were immobilized on an indium tin oxide (ITO) surface to form a molecular electrocatalytic water oxidation assembly that mimics photosystem II in producing oxygen with high turnover numbers (TONs). The catalyst shows TONs for O2 higher than 210 000 and frequencies 6.7 s−1 during electrochemical catalytic splitting.

Effect of positioning the cyanoacrylic acid anchoring group on ring periphery phenothiazine dye performance dye-sensitized solar cells (DSSCs) is reported. Two types dyes, one having substitution C-3 aromatic (Type 1) and another through N-terminal 2), have been synthesized for this purpose. Absorption fluorescence studies performed to visualize effect pattern spectral coverage electrochemical monitor tuning redox levels. B3LYP/6-31G* are frontier orbital location their significance in...