Abstract Two‐photon photodynamic therapy is a promising therapeutic method which requires the development of sensitizers with efficient two‐photon absorption and singlet‐oxygen generation. Reported here are two new diketopyrrolopyrrole‐porphyrin conjugates as robust absorbing dyes high cross‐sections within window. Furthermore, for first time generation efficiency diketopyrrolopyrrole‐containing systems investigated. A preliminary study on cell culture showed induced phototoxicity.

A new synthetic procedure has been developed which makes possible the preparation of IrLL'3+ complexes (L, L' = terpyridine derivative) in good yields. In a first step, IrLCl3 is obtained under relatively mild conditions as an intermediate. Subsequent reaction with (a few minutes refluxing ethylene glycol) affords IrLL'3+. The electrochemical behavior and ground- excited-state spectroscopic properties four nitrile solvents are reported. X-ray structure one these also described. have designed...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRigid Rod-Like Dinuclear Ru(II)/Os(II) Terpyridine-Type Complexes. Electrochemical Behavior, Absorption Spectra, Luminescence Properties, and Electronic Energy Transfer through Phenylene BridgesFrancesco Barigelletti, Lucia Flamigni, Vincenzo Balzani, Jean-Paul Collin, Jean-Pierre Sauvage, Angelique Sour, Edwin C. Constable, Alexander M. W. Cargill ThompsonCite this: J. Am. Chem. Soc. 1994, 116, 17, 7692–7699Publication Date (Print):August 1,...

Four new dimeric bis(BF(2))-2,2'-bidipyrrins (bisBODIPYs), and their corresponding BODIPY monomers, have been prepared studied with respect to structural photophysical properties. The solid-state molecular structure of the dimers relative orientation subunits revealed by an X-ray diffraction study, which showed that molecules contain two directly linked chromophores in a conformationally fixed, almost orthogonal arrangement. Two fluorine atoms are close contact each other (19)F NMR spectra...

By applying the three-dimensional template effect of copper(I), previously used for making various interlocking ring systems, a new disymmetrical [2]-catenate has been made which consists two different rings. One contains 2,9-diphenyl-1,10-phenanthroline (dpp) unit whereas other cycle incorporates both dpp motif and 2,2',6',2''-terpyridine (terpy) fragment, coordination site these chelates pointing toward inside ring. Depending on oxidation state central metal (Cu(I) or Cu(II)), thus its...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced processes in dyads and triads containing a ruthenium(II)-bis(terpyridine) photosensitizer covalently linked to electron donor acceptor groupsJean Paul Collin, Stephane Guillerez, Jean Pierre Sauvage, Francesco Barigelletti, Luisa De Cola, Lucia Flamigni, Vincenzo BalzaniCite this: Inorg. Chem. 1991, 30, 22, 4230–4238Publication Date (Print):October 1, 1991Publication History Published online1 May 2002Published inissue 1 October...

In photosynthesis, sunlight energy is converted into a chemical potential by an electron transfer sequence that started excited state and ultimately yields long-lived charge-separated state. This process can be reproduced carefully designed multicomponent artificial arrays of three or more components, the stored used to oxidize reduce molecules in solution, inject electrons holes, create flow. Therefore, important both for artificial-photosynthesis research photovoltaic optoelectronic...

The photophysical and spectroscopic characterization of four new dimeric bis(BF2)-2,2′-bidipyrrins (BisBODIPYs) recently synthesized characterized (Chem. Eur. J., 2008, 14, 2976–2983) has been undertaken along with that the component BODIPY monomers. monomers display typical properties this family; (i) narrow intense single absorption band in visible range at 530 nm; (ii) intense, solvent independent emission (Φflca. 1); (iii) a 200–400 cm−1 Stokes shifted emission, polarity; (iv) no...

A detailed photophysical characterization of a series six free-base corroles with different substitution patterns at meso-positions is presented. In air-free toluene 295 K, the luminescence quantum yields range from 0.13 to 0.22 and lifetimes vary 4.1 ns 6.3 whereas in air-saturated 3.8 5.6 ns. glassy 77 K have values 5.2 7.9 Transient absorption spectra singlet excited states positive bands art λ < 550 nm > 680–700 nm. The transient lowest triplet display band around 460–470 bleaching...

The electronic absorption spectra, luminescence spectra and lifetimes (in MeCN at room temperature in frozen n-C3H7CN 77 K), electrochemical potentials MeCN) of the novel dinuclear [(tpy)Ru(3)Os(tpy)]4+ trinuclear [(tpy)Ru(3)Os(3)Ru(tpy)]6+ complexes (3=2,5-bis(2,2′:6′,2″-terpyridin-4-yl)thiophene) have been obtained are compared with those model mononuclear homometallic [(tpy)Ru(3)Ru(tpy)]4+, [(tpy)Os(3)Os(tpy)]4+ [(tpy)Ru(3)Ru(3)Ru(tpy)]6+ complexes. bridging ligand 3 is nearly planar...

A new methanofullerene derivative with a pyridine residue at the methano bridge (PC60) has been synthesized. Its electrochemical and photophysical properties have investigated in toluene solution along those of analogous fullerene mono-malonate adduct RC60, which does not contain pyridyl moiety. PC60 RC60 display almost identical steady state absorption luminescence transient spectra, as shown by means nano- picosecond laser flash photolysis. Their markedly different spectroscopic features...

We have prepared rodlike cyclometalated Ru(II)/Os(II) dinuclear complexes, (ttp)Ru(dpb-(ph)(n)()-dpb)Os(ttp)(2+), where the biscyclometalating bridging ligands contain dipyridylbenzene fragments, dbp, separated by a variable number, n, of phenylene spacers, and terminal ligand is terpyridine derivative [dpbH di-2-pyridyl-1,3-benzene, ttp 4'-p-tolyl-2,2':6',2"-terpyridine, n = 0-2]. The rigid keep metal centers at distance r(MM) 11, 15.5, 20 Å, depending on n. Photoinduced energy transfer has...

For the structurally rigid homometallic dinuclear complexes (ttp)Ru(tpy-tpy)Ru(ttp)4+ and (ttp)Ru(tpy-ph-tpy)Ru(ttp)4+, we have obtained ground-state absorption spectra transient-absorption difference at room temperature luminescence lifetimes in interval from to matrix (90 K); solvent was acetonitrile or butyronitrile (tpy is 2,2':6',2''-terpyridine, ttp 4'-p-tolyl-2,2':6',2''-tpy, ph 1,4-phenylene). The gathered spectroscopic data indicate that after of visible light, formation luminescent...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced energy and electron transfer processes in supramolecular species, tris(bipyridine) complexes of ruthenium(II)/osmium(II), Ru(II)/Ru(III), Os(II)/Os(III), Ru(II)/Os(III) separated by a rigid spacerLuisa De Cola, Vincenzo Balzani, Francesco Barigelletti, Lucia Flamigni, Peter Belser, Alex von Zelewsky, Michael Frank, Fritz VoegtleCite this: Inorg. Chem. 1993, 32, 23, 5228–5238Publication Date (Print):November 1, 1993Publication History...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInclusion of fluorescein and halogenated derivatives in .alpha.-, .beta.-, .gamma.-cyclodextrins: a steady-state picosecond time-resolved studyLucia FlamigniCite this: J. Phys. Chem. 1993, 97, 38, 9566–9572Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Published inissue 1 September 1993https://doi.org/10.1021/j100140a006RIGHTS & PERMISSIONSArticle Views903Altmetric-Citations110LEARN ABOUT THESE...

A diverse set of imidazole- and π-expanded imidazole derivatives displaying excited state intramolecular proton transfer (ESIPT) was designed synthesized. The effect structural variation on photophysical properties studied in detail for nine dyes. relationship between the structure thoroughly elucidated also by comparing with analogues blocked ESIPT functionality. All but one obtained compounds exhibit ESIPT, as demonstrated large Stokes shifts (6500–15 600 cm−1). type π-expansion strongly...

A series of π-expanded coumarins comprising 4–5 conjugated rings were designed and synthesized. The strategic placement two dialkylamino groups containing long alkyl chains attached to the peripheral ends bis-coumarins resulted in dyes with superb solubility. As α,β-unsaturated ketones, these compounds display properties donor–acceptor–donor (D–A–D)-type chromophores. Photophysical studies new functional revealed a combination favorable properties: strong absorption blue green light, weak...

The convergent synthesis and characterization of a potential theranostic agent, [DPP-ZnP-GdDOTA](-), which combines diketopyrrolopyrrole-porphyrin component DPP-ZnP as two-photon photosensitizer for photodynamic therapy (PDT) with gadolinium(III) DOTA complex magnetic resonance imaging probe, is presented. [DPP-ZnP-GdDOTA](-) has remarkably high longitudinal water proton relaxivity (19.94 mm(-1) s(-1) at 20 MHz 25 °C) monohydrated molecular system this size. Nuclear Magnetic Relaxation...