ChemInform Abstract: Iridium Terpyridine Complexes as Functional Assembling Units in Arrays for the Conversion of Light Energy

Istituto ISOF-CNR, Via P. Gobetti 101, 40129 Bologna, Italy.
Accounts of Chemical Research (Impact Factor: 22.32). 07/2008; 41(7):857-71. DOI: 10.1021/ar700282n
Source: PubMed


In photosynthesis, sunlight energy is converted into a chemical potential by an electron transfer sequence that is started by an excited state and ultimately yields a long-lived charge-separated state. This process can be reproduced by carefully designed multicomponent artificial arrays of three or more components, and the stored energy can be used to oxidize or reduce molecules in solution, to inject electrons or holes, or to create an electron flow. Therefore, the process is important both for artificial-photosynthesis research and for photovoltaic and optoelectronic applications. Molecular arrays for photoinduced charge separation often use chromophores that resemble the natural ones. However, new synthetic components, including transition metal complexes, have had some success.

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    • "The coordination chemistry of multidentate ␣-terpyridine-based ligands (tpy) is interesting because of their application in emitters for electroluminescence devices and in molecular probes for biochemical research [1] [2] [3] [4] [5] [6]. Along with the structural features, these ligands and their complexes have interesting electrochemical , catalytic and optical properties [7] [8] [9]. "
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    ABSTRACT: The new 1D coordination polymer, [Cd(Clphtpy)(NCS)(NO3)] n (Clphtpy = 4'- chlorophenyl-2,2':6',2''-terpyridine), was prepared and characterized by CHN elemental analysis, 1H NMR-, IR spectroscopy and analyzed structurally by X-ray single-crystal diffraction. X-ray crystallography data showed that the asymmetric unit of complex comprised an independent mononuclear cadmium complex with a seven-coordinate "CdN 4O2S" core. The complex was tested against four gram-positive and four gram-negative bacteria. It exhibited good activity against most of the bacteria and its activity was better than gentamicin as a standard antibiotic. The luminescence properties of the free ligand and the complex were investigated.
    Main Group Chemistry 11/2013; 12 (2013)(4):349–360. DOI:10.3233/MGC-130114 · 0.46 Impact Factor
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    ABSTRACT: Two triads (i.e., 3PTZ–Pt–MNDI and 10PTZ–Pt–MNDI) consisting of 3-phenothiazine (3PTZ) or 10-phenothiazine (10PTZ), bipyridine–diacetylide platinum complex (Pt), and naphthalene diimide (MNDI) chromophores linked by highly twisted biphenylene spacers have been prepared. The formation and decay of the charge-separated (CS) states in toluene were studied by use of picosecond and nanosecond laser photolysis via selective excitation of the Pt moiety. The time required for formation of the CS state, PTZ+–Pt–MNDI−, from PTZ–3Pt*–MNDI was determined to be τ CS = 280 ps for 3PTZ+–Pt–MNDI− and τ CS = 230 ps for 10PTZ+–Pt–MNDI−. The lifetimes of the CS states were determined to be τ CR1 = 75 ns (95 %) and τ CR2 = 285 ns (5 %) for 3PTZ+–Pt–MNDI− and τ CR = 830 ns for 10PTZ+–Pt–MNDI−. Formation and decay of the CS states are discussed in terms the Marcus theory and the spin-correlated radical pair mechanism.
    Research on Chemical Intermediates 01/2012; 39(1). DOI:10.1007/s11164-012-0642-6 · 1.22 Impact Factor
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    ABSTRACT: The kinetics for photoinduced charge separation and thermal charge-recombination processes in three donor–bridge–acceptor molecules with rhenium(I) tricarbonyl diimine photosensitizers were investigated. Time resolved luminescence and transient absorption spectroscopies reveal that in addition to driving force effects, differences in bridge-mediated electronic donor–acceptor coupling among the three dyads play important roles. Notably, it is seen that charge separation depends strongly on whether initial photoexcitation involves promotion of an electron towards or away from a phenothiazine electron donor. Thermal charge recombination rates are found to differ by a factor of 2 between two isomeric dyads due to an electronic coupling effect.
    Inorganica Chimica Acta 02/2009; 362(10). DOI:10.1016/j.ica.2009.01.040 · 2.05 Impact Factor
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