Thermal, optical, electrochemical properties and conductivity of trans- and cis-poly(1-ethynylpyrene): a comparative investigation

Rivera, Ernesto; Aguilar-Martı́nez, Martha; Terán, G.; Flores, Raúl F.; Bautista-Martínez, José Antonio

doi:10.1016/j.polymer.2005.04.003

Cited by 23 publications

(17 citation statements)

References 42 publications

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“…On the other hand, the fact that the lowest energy band of trans-PEP is significantly red-shifted in sol-gel compared to that observed in THF solution, reveals that in this media the polyacetylene main chain of this polymer is better aligned to planarity. A similar behavior was observed in cast films of trans and cis-PEP [11], where the absorption bands are red-shifted compared to those observed in solution. This phenomenon can be explained in terms of the viscosity of the environment.…”

Section: Resultssupporting

confidence: 75%

“…Optical properties of trans-and cis-PEP in THF solution were previously reported by us, and both absorption and emission spectra were discussed in detail [10,11]. Fig.…”

Section: Resultsmentioning

confidence: 71%

“…Besides, trans-PEP shows also an emission tail in sol-gel from 413 nm to beyond 600 nm. Similarly, in THF solution, this polymer shows considerable emission beyond 500 nm [10,11]. It is very well known that pyrene itself does not emit at this wavelength [45] so that this emission can be only due to intramolecular interactions between pendant pyrene groups in trans-PEP.…”

Section: Resultsmentioning

confidence: 83%

“…Since the properties of polyarylacetylenes depend on a big measure of the geometry of the polyacetylene backbone, we carried out a comparative study of thermal, optical, electrochemical properties and conductivity between two samples of trans-PEP and cis-PEP bearing the same molecular weight (M w Z24,000 g/mol) [10,11]. Absorption spectra of these polymers in tetrahydrofuran (THF) solution showed that trans-PEP possesses a higher degree of conjugation than its homologue cis-PEP.…”

Section: Introductionmentioning

confidence: 99%

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Linear and nonlinear optical properties of trans- and cis-poly(1-ethynylpyrene) based sonogel hybrid materials

Morales–Saavedra¹,

Rivera²

2006

Polymer

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Section: Resultssupporting

confidence: 75%

“…Optical properties of trans-and cis-PEP in THF solution were previously reported by us, and both absorption and emission spectra were discussed in detail [10,11]. Fig.…”

Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Linear and nonlinear optical properties of trans- and cis-poly(1-ethynylpyrene) based sonogel hybrid materials

Morales–Saavedra¹,

Rivera²

2006

Polymer

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“…Catalytic polymerization of EP with WCl 6 resulted in the formation of trans-poly(1-ethynylpyrene) (trans-PEP) with molecular weights ranging from 24 to 470 kg/mol and polydispersities between 2.9 and 11 [11]. Furthermore, we have studied the thermal, optical, electrochemical properties and conductivity of polyarylacetylenes bearing condensed aromatic groups in function of the geometry of the polyacetylene backbone and the internal stacking of pendant substituents [13,14]. For this purpose, we selected poly(EP) as model molecule because pyrene is an efficient fluorescent probe, which has been successfully used as a molecular label in the study of a huge variety of polymers [15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Thermal, Optical, Electrochemical Properties and Conductivity of Pyrene Monomers

Aguilar-Martı́nez

Bautista-Martínez

Rivera

2008

Designed Monomers and Polymers

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The thermal, optical and electrochemical properties of a series of novel pyrene derivatives, that can be used as promising monomers in the preparation of conducting polymers, have been studied in this work. Four compounds, 1-ethynylpyrene (EP), 1-(1-trimethylsilyl-1,3-butadiinyl)pyrene (TMSBDP), 1-(1-buten-3-inyl)pyrene (BP) and 1-(3,6,8-tris(methylsulfanyl)-1-pyrenyl)-1-methyloxirane (TMSPMO), have been studied. Absorption spectra of these compounds show a maximum absorption wavelength between 372 and 416 nm. Cyclic voltammograms of EP, TMSBDP and BP exhibit irreversible oxidation anodic peaks around 1260-1670 mV vs. Ag + /Ag and in some cases cathodic reduction peaks are also observed. By contrast, TMSPMO shows three anodic oxidation waves, at 1110, 1422 and 1727 mV vs. Ag + /Ag. The conductivities of these compounds have been measured in pressed pellet in the non-doped state giving values in the range of 10 −2 -10 −3 S/cm.  Koninklijke Brill NV, Leiden, 2008

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Bare metal stenting for obstructed small diameter homograft conduits in the right ventricular outflow tract

Carr

Bergersen

Marshall

et al. 2012

Cathet Cardio Intervent

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ObjectiveOur aim was to assess acute hemodynamic changes with stent insertion, outcomes, and factors associated with increased longevity of stented small diameter homograft conduits.BackgroundRight ventricle‐to‐pulmonary artery (RV‐PA) homograft conduits are commonly used to palliate RV outflow tract obstruction. Bare metal stenting (BMS) and transcatheter pulmonary valve implantation have been shown to relieve obstructed larger diameter conduits and may delay surgical conduit reintervention. Less is known about BMS of small conduits.Methods and ResultsFrom 1992 to 2009, BMS was performed to relieve obstruction in 106 homograft conduits that were ≤12 mm at implant. The peak RV‐PA gradient fell from 54.3 ± 17.4 mm Hg at baseline to 46.1 ± 15.2 mm Hg after balloon dilation alone and to 25.1 ± 11.4 mm Hg with stenting (all P < 0.001). Higher pre‐BMS gradient and RV pressure were the only factors associated with higher post‐BMS RV‐PA gradient (≥30 mm Hg; both P < 0.001). There were no procedural deaths, two patients required surgical removal of embolized stents. At a median follow‐up of 1.6 years, 83 conduits were replaced; freedom from conduit reoperation after BMS was 66% ± 5% at 1 year and 28% ± 5% at 3 years. Factors associated with shorter freedom from reoperation included implanted conduit diameter <10 mm (P = 0.009), higher post‐stent RV‐PA gradient (P = 0.026), and higher post‐stent RV pressure (P < 0.01); only post‐stent RV pressure remained significant on multivariable analysis (P < 0.001).ConclusionBMS was acutely effective for the treatment of obstructed small diameter homograft conduits, with low morbidity. Prolongation of small diameter homograft conduit longevity with BMS may be useful in the lifetime management of conduit dysfunction in this patient population. © 2012 Wiley Periodicals, Inc.

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Thermal, optical, electrochemical properties and conductivity of trans- and cis-poly(1-ethynylpyrene): a comparative investigation

Cited by 23 publications

References 42 publications

Linear and nonlinear optical properties of trans- and cis-poly(1-ethynylpyrene) based sonogel hybrid materials

Linear and nonlinear optical properties of trans- and cis-poly(1-ethynylpyrene) based sonogel hybrid materials

Thermal, Optical, Electrochemical Properties and Conductivity of Pyrene Monomers

Bare metal stenting for obstructed small diameter homograft conduits in the right ventricular outflow tract

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