Picosecond Kinetics and Reverse Saturable Absorption of Meso-Substituted Tetrabenzoporphyrins

Chen, Peilin; Tomov, I. V.; Dvornikov, Alexander; Nakashima, Masato; Roach, Joseph F.; Alabran, David M.; Rentzepis, P. M.

doi:10.1021/jp9615161

Cited by 73 publications

(68 citation statements)

References 31 publications

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“…Recently, time-resolved diffraction patterns of cw ultrasonically excited crystals were obtained with a synchrotron source [7]. Other experiments have employed picosecond time-resolved x-ray diffraction to study transient lattice dynamics in metals [8], organic films [9], and impulsive strain generation and melting in semiconductors [10][11][12][13][14]. In particular Rose-Petruck et al [10] demonstrated transient ultrafast strain propagation in GaAs by laser-pump, x-ray-probe diffraction.…”

Section: (Received 28 November 2000)mentioning

confidence: 99%

Probing Impulsive Strain Propagation with X-Ray Pulses

et al. 2001

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Pump-probe time-resolved x-ray diffraction of allowed and nearly forbidden reflections in InSb is used to follow the propagation of a coherent acoustic pulse generated by ultrafast laser-excitation. The surface and bulk components of the strain could be simultaneously measured due to the large x-ray penetration depth. Comparison of the experimental data with dynamical diffraction simulations suggests that the conventional model for impulsively generated strain underestimates the partitioning of energy into coherent modes. 78.47.+p 61.10.-i 63.20.-e The absorption of ultrafast laser pulses in opaque materials generates coherent stress when the pulse length is short compared with time for sound to propagate across an optical penetration depth [1]. The resulting strain field consists of both a surface component, static on time scales where thermal diffusion can be ignored, and a bulk component that propagates at the speed of sound (coherent acoustic phonons). This strain is typically probed by optical methods that are sensitive primarily to the phonon component within the penetration depth of the light [1,2]. However, such methods give little information about the surface component of the strain, and, moreover, they are unable to give a quantitative measure of the strain amplitude.Due to their short wavelengths, long penetration depths, and significant interaction with core electrons, x-rays are a sensitive probe of strain. We note that coherent lattice motion adds sidebands to ordinary Bragg reflection peaks due to x-ray Brillouin scattering if the momentum transfer is large compared to the Darwin width, equivalent to phonons of GHz frequency for strong reflections from perfect crystals. This effect was demonstrated many years ago with acoustoelectrically amplified phonons using a conventional x-ray tube [3].With the recent availability of high brightness short-pulse hard x-ray sources, including third generation synchrotron sources and optical laser based sources [4-6], coherent strain generation and propagation can now be probed by x-ray methods in both the frequency and time domains. Recently, time-resolved diffraction patterns of cw ultrasonically excited crystals were obtained with a synchrotron source [7]. Other experiments have employed picosecond time-resolved x-ray diffraction to study transient lattice dynamics in metals [8], organic films [9], and impulsive strain generation and melting in semiconductors [10][11][12][13][14]. In particular Rose-Petruck et al.[10] demonstrated transient ultrafast strain propagation in GaAs by laser-pump x-ray-probe diffraction. In that experiment, x-rays were diffracted far outside the Bragg peak; however, no oscillations in the diffraction efficiency were detected, and the data were consistent with a unipolar strain pulse. In a similar experiment, Lindenberg et al. [13] detected oscillations in the sidebands for an asymmetrically cut InSb crystal using a streak camera. These oscillations were due to lattice compression and were probed for discrete phonon frequencies i...

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Section: (Received 28 November 2000)mentioning

confidence: 99%

Probing Impulsive Strain Propagation with X-Ray Pulses

et al. 2001

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“…Highly conjugated porphyrins with a strong absorption in the far-visible/near-IR region have attracted a great level of interest in recent years due to their intrinsic value as photosensitiser for the photodynamic therapy of cancer (PDT) [1], multibit molecular-based information storage arrays [2][3][4][5][6][7], or near-IR dyes and nonlinear optical materials [8,9].…”

Section: J Heterocyclic Chem 42 503 (2005)mentioning

confidence: 99%

Linearly -π- extended porphyrins: Synthesis of novel tetrabenzoylporphyrins

Elghamry

Tietze

2005

Journal of Heterocyclic Chemistry

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The π-extended porphyrins 11a -c with a λ max = 644, 643 and 639 nm were synthesized by an acid catalysed reaction of the dipyrrolylmethane 10 with different aldehydes followed by oxidation with 2,3-dichloro-5,6-dicyano-1,4-quinone (DDQ). In a second approach, 10 was decarboxylated to yield 12, which was treated with DMF and benzoylchloride to give the diformyl compound 13. Acid catalysed reaction of 12 and 13 led to the porphyrin 11a after oxidation.

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“…The additional requirements of a long excited-state lifetime, high resistance to degradative photochemistry, and large magnitude nonlinear optical (NLO) response have made identification of OPL candidates based on RSA for the NIR difficult. In contrast, a wide variety of optical limiting materials based upon phthalocyanine, [3][4][5][6][7][8][9][10][11] porphyrin, [12][13][14] fullerene, [15][16][17][18][19][20] carbon nanotube, 9,[21][22][23][24][25] nanoparticle, [26][27][28][29][30][31][32][33][34] and other [35][36][37][38][39][40] motifs have been identified for the visible spectral region. The limited number of potential NIR OPL materials 39,[41][42][43][44][45][46][47]…”

Section: Introductionmentioning

confidence: 99%

Excitation of Highly Conjugated (Porphinato)palladium(II) and (Porphinato)platinum(II) Oligomers Produces Long-Lived, Triplet States at Unit Quantum Yield That Absorb Strongly over Broad Spectral Domains of the NIR

et al. 2010

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Transient dynamical studies of bis [(5,5′-10,20-bis(2,6-bis(3,3-dimethylbutoxy)phenyl)porphinato)palladium(II)] ethyne (PPd 2 ), 5,15-bis{ [(5′-10,20-bis(2,6-bis(3,3-dimethylbutoxy)phenyl)porphinato)palladium(II)]ethynyl}(10,20-bis(2,6-bis(3,3-dimethylbutoxy)phenyl)porphinato)palladium(II) (PPd 3 ), bis [(5,5′-10,20-bis(2,6-bis(3,3-dimethylbutoxy)phenyl)porphinato)platinum(II)]ethyne (PPt 2 ), and 5,15-bis{[(5′-10,20-bis(2,6-bis(3,3-dimethylbutoxy)phenyl)porphinato)platinum(II)]ethynyl}(10,20-bis(2,6-bis(3,3-dimethylbutoxy)phenyl)porphinato)platinum(II) (PPt 3 ) show that the electronically excited triplet states of these highly conjugated supermolecular chromophores can be produced at unit quantum yield via fast S 1 f T 1 intersystem crossing dynamics (τ isc : 5.2-49.4 ps). These species manifest high oscillator strength T 1 f T n transitions over broad NIR spectral windows. The facts that (i) the electronically excited triplet lifetimes of these PPd n and PPt n chromophores are long, ranging from 5 to 50 µs, and (ii) the ground and electronically excited absorptive manifolds of these multipigment ensembles can be extensively modulated over broad spectral domains indicate that these structures define a new precedent for conjugated materials featuring low-lying π-π* electronically excited states for NIR optical limiting and related long-wavelength nonlinear optical (NLO) applications.

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Picosecond Kinetics and Reverse Saturable Absorption of Meso-Substituted Tetrabenzoporphyrins

Cited by 73 publications

References 31 publications

Probing Impulsive Strain Propagation with X-Ray Pulses

Probing Impulsive Strain Propagation with X-Ray Pulses

Linearly -π- extended porphyrins: Synthesis of novel tetrabenzoylporphyrins

Excitation of Highly Conjugated (Porphinato)palladium(II) and (Porphinato)platinum(II) Oligomers Produces Long-Lived, Triplet States at Unit Quantum Yield That Absorb Strongly over Broad Spectral Domains of the NIR

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