FT-Raman studies on new triphenylphosphin-copper(I) triazenido complexes

Cı̂ntá, S.; Venter, Monica M.; Fickert, C.; Haiduc, Ionel; Scholz, Peter; Kiefer, W.

doi:10.1016/s0022-2860(98)00292-0

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…Figure . Table compiles the Raman band positions for P1 − P5 and their assignments; − data are tabulated both for the solution (columns A) and NTA-bound (columns B) forms of the chromophore.…”

Section: Resultsmentioning

confidence: 99%

Photoelectrochemical Behavior of Polychelate Porphyrin Chromophores and Titanium Dioxide Nanotube Arrays for Dye-Sensitized Solar Cells

et al. 2009

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The influence of TiO2 nanotube array (NTA) morphology on dye-sensitized solar cell performance was studied with five porphyrin chromophores containing up to four carboxylic acid anchor groups. The TiO2 NTAs were anodically grown on Ti foil in NH4F electrolyte containing additives such as poly(ethylene glycol) (PEG 400), ethylene glycol, and glycerol. The NTAs grown in the presence of PEG 400 had the largest nanotube diameter (∼120 nm) and also yielded the best photoresponse with all five porphyrins in iodide/polyiodide electrolyte. Interestingly, nanoporous TiO2 “control” films, anodically grown on Ti foil in the absence of the organic additive, yielded an inferior photoresponse under the same conditions. Two of the porphyrins (P3 and P5), envisioned to have a spider-like configuration on the TiO2 NTA surface, yielded the best photoresponse among the five candidates in the Q(1,0) porphyrin spectral region. This result underlines that the molecular structure of the chromophore affects the directionality of electron transfer and its consequent ability to inject electrons (by the photoexcited porphyrin) into the oxide nanotube host. Finally, some perspectives on the use of TiO2 NTAs and porphyrins in DSSCs are given against the backdrop of the above data.

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Section: Resultsmentioning

confidence: 99%

Photoelectrochemical Behavior of Polychelate Porphyrin Chromophores and Titanium Dioxide Nanotube Arrays for Dye-Sensitized Solar Cells

et al. 2009

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“…In the case of the ortho-isomer such selectivity is not so clearcut, as in this case the two transitions are not so sharply separated, and the fine-tuning of the resonant enhancement is not as evident as in the case of [PNPT] . Cinta et al 20 reported the Raman spectra of three 1,3-bis(p-nitrophenyl)triazenes, in neutral and coordinated as the (N 3 ) triazenido species in copper complexes, and showed that after deprotonation the two N-N bonds become equivalent by virtue of the electron delocalization. The same behavior was also observed in the present work, with just one mode observed at ca 1470 cm 1 in the anionic species.…”

Section: Resultsmentioning

confidence: 99%

Bichromophoric behavior of nitrophenyl‐triazene anions: a resonance Raman spectroscopy investigation

Ando¹,

Santos

Hörner

et al. 2008

J Raman Spectroscopy

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Highly delocalized molecular frameworks with intense charge transfer transitions, known as pushpull systems, are of central interest in many areas of chemistry, as is the case of nitrophenyl-triazene derivatives. The 1,3-bis(2-nitrophenyl)triazene and 1,3-bis(4-nitrophenyl)triazene were investigated by electronic (UV-Vis) and resonance Raman (RR) spectroscopies. The bichromophoric behavior of 1,3-bis(4-nitrophenyl)triazene anion opens the possibility of tuning with visible radiation, two distinct electronic states. The RR profiles of nitrophenyl-triazene derivatives clearly show that the first allowed electronic state can be assigned to a charge transfer from the ring p system to the NO 2 moiety (ca 520 nm), while the second, as a charge transfer from N 3 − to the aromatic ring (ca 390 nm). In the para-substituted derivative, a more efficient electron transfer and a greater energy separation between the two excited states are observed.

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“…Compared with PMO(Ph), Pd-PPh 2 -PMO(Ph) shows three additional peaks around 2890, 2980, and 1527 cm −1 due to vibrations from C−H and C−P in the CH 2 −CH 2 and PPh 2 groups . The Raman peaks around 777, 1324, 1598, 1028, and 997 cm −1 also confirm the presence of phenyl, Pd−P, and P−C groups . These results demonstrate the successful incorporation of both Pd-PPh 2 CH 2 CH 2 and the phenyl into silica walls, which is further confirmed by solid NMR spectra (Figure S5).…”

mentioning

confidence: 60%

Periodic Mesoporous Organometallic Silicas with Unary or Binary Organometals inside the Channel Walls as Active and Reusable Catalysts in Aqueous Organic Reactions

et al. 2010

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A new type of heterogenized organometallic catalysts, periodic mesoporous organometallic silicas with organometals and organic groups embedded in silica walls have been developed using surfactant-directed co-condensation. These catalysts exhibit high efficiencies and strong durability in water-medium organic reactions. Moreover, a bifunctional catalyst containing both Pd(II) and Ru(II) organometals inside pore walls can catalyze the water-medium "one-pot" cascade reaction effectively. These catalysts can be conveniently recycled and reused without significant loss of catalytic activities.

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FT-Raman studies on new triphenylphosphin-copper(I) triazenido complexes

Cited by 5 publications

References 10 publications

Photoelectrochemical Behavior of Polychelate Porphyrin Chromophores and Titanium Dioxide Nanotube Arrays for Dye-Sensitized Solar Cells

Photoelectrochemical Behavior of Polychelate Porphyrin Chromophores and Titanium Dioxide Nanotube Arrays for Dye-Sensitized Solar Cells

Bichromophoric behavior of nitrophenyl‐triazene anions: a resonance Raman spectroscopy investigation

Periodic Mesoporous Organometallic Silicas with Unary or Binary Organometals inside the Channel Walls as Active and Reusable Catalysts in Aqueous Organic Reactions

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