Thermal and electrical properties of porphyrin derivatives and their relevance for molecule interferometry

Slow beams of neutral molecules are of great interest for a wide range of applications, from cold chemistry through precision measurements to tests of the foundations of quantum mechanics. We report on the quantitative observation of thermal beams of perfluorinated macromolecules with masses up to 6000 amu, reaching velocities down to 11 m/s. Such slow, heavy and neutral molecular beams are of importance for a new class of experiments in matter-wave interferometry and we also discuss the requirements for further manipulation and cooling schemes with molecules in this unprecedented mass range.

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“…This increase is already rather significant and will enable interferometry experiments with these larger perfluoroalkylated molecules [36].…”

Section: A Optical Focusing In a Cavitymentioning

confidence: 99%

Slow beams of massive molecules

et al. 2007

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“…The new interferometer also leads to a number of applications, including tests of recent proposals on gravitational decoherence 11 or molecule metrology 10 . It is particularly interesting to note that azobenzenes and their derivatives are often used as molecular LETTERS switches, which change their conformation on absorption of a single photon 30 .…”

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confidence: 99%

“…Coherence experiments with complex objects are of interest for exploring the transition to classical physics [7][8][9] , for measuring molecular properties 10 , and they have even been proposed for testing new models of space-time 11 . For matter-wave experiments with complex molecules, the strongly dispersive effect of the interaction between the diffracted molecule and the grating wall is a major challenge because it imposes enormous constraints on the velocity selection of the molecular beam 12 .…”

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confidence: 99%

A Kapitza–Dirac–Talbot–Lau interferometer for highly polarizable molecules

et al. 2007

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Research on matter waves is a thriving field of quantum physics and has recently stimulated many investigations with electrons 1 , neutrons 2 , atoms 3 , Bose-condensed ensembles 4 , cold clusters 5 and hot molecules 6 . Coherence experiments with complex objects are of interest for exploring the transition to classical physics 7-9 , for measuring molecular properties 10 , and they have even been proposed for testing new models of space-time 11 . For matter-wave experiments with complex molecules, the strongly dispersive effect of the interaction between the diffracted molecule and the grating wall is a major challenge because it imposes enormous constraints on the velocity selection of the molecular beam 12 . Here, we describe the first experimental realization of a new set-up that solves this problem by combining the advantages of a so-called Talbot-Lau interferometer 13 with the benefits of an optical phase grating.Several methods have been developed in the past for the coherent manipulation of matter waves with de Broglie wavelengths in the nanometre and picometre range. For instance, free-standing material gratings were used in the diffraction of electrons 14 , atoms 15,16 and molecules 5,6,17 . In addition, coherent beam splitting at non-resonant standing light waves, often designated the KapitzaDirac effect, has been observed for all of these species [18][19][20] . Recent implementations of near-field interferometry 13,[21][22][23] underlined the particular advantages of the Talbot-Lau concept for experiments with massive objects: the required grating period scales only weakly (d ∼ √ l) with the de Broglie wavelength, and the design accepts beams of low spatial coherence, which makes high signals possible even for weak sources.A symmetric Talbot-Lau interferometer (TLI) consists of three identical gratings. The first one prepares the transverse coherence of the weakly collimated beam. Quantum near-field diffraction at the second nanostructure generates a periodic molecular density distribution at the position of the third mask, which represents a self-image of the second grating, if the grating separation equals a multiple of the Talbot length L T = d 2 /l. The mask can be laterally shifted to transform the molecular interference pattern into a modulation of the molecular beam intensity that is recorded behind the interferometer.In the established TLI design with three nanofabricated gratings 23 , the molecule-wall interaction with the grating bars imprints a further phase shift ϕ on the matter wave, which depends on the molecular polarizability α, the velocity v z and the distance r to the wall within the grating slit. Because of its strongly nonlinear r-dependence, this interaction restricts the interference contrast to very narrow bands of de Broglie wavelengths, as we show in Fig. 1a for the example of the fullerene C 70 . In this simulation, we use the full Casimir-Polder potential 24 , even though the long-distance (retarded) approximation, decaying as α/r 4 , closely reproduces the results. The sha...

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“…In aqueous solution at pH value of 7.40, the acid phenylsulfonic group of FeTPPS is dissociated in anionic form and H + as the value of the dissociation constant pKa is 4.8 [25]. Investigations on the acid dissociation of protonated nitrogen atoms of quinoline antimalarials in aqueous solution provided two apparent constants, pKa 1 …”

Section: Uv-visible Spectrophotometrymentioning

confidence: 99%

“…Porphyrins and their derivatives are well-investigated molecules because of numerous potential applications from molecular electronics, over sensors and information storage elements, to medical agents [1] [2]. Ferric porphyrins seem to play an important role as receptor of an enormous number of ligands [3] [4] [5] [6] [7].…”

Section: Introductionmentioning

confidence: 99%

Interaction of Iron(III)-5,10,15,20-Tetrakis (4-Sulfonatophenyl) Porphyrin with Chloroquine, Quinine and Quinidine

Bibelayi¹,

Kilunga²,

Lundemba³

et al. 2017

CSTA

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Iron(III)-5,10,15,20-tetrakis(4-sulfonatophenyl) porphyrin (FeTPPS) is used as non-physiological metalloporphyrin model for the natural iron (III)-protoporphyrin IX (FePPIX) resulting from hemoglobin degradation to investigate ligand binding reactions in aqueous solution. Studies were conducted on the interaction of FeTPPS with Chloroquine, Quinine, and Quinidine, which are historically the most common quinoline-based drugs used to treat malaria, an infectious disease afflicting several hundred millions every year worldwide, mainly in tropical regions. Using UV-Visible spectrophotometry, the binding reaction was studied at pH 7.40 in purely aqueous solution, and in aqueous solution containing NaNO 3 at concentration of 0

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Thermal and electrical properties of porphyrin derivatives and their relevance for molecule interferometry

Cited by 23 publications

References 39 publications

Slow beams of massive molecules

Slow beams of massive molecules

A Kapitza–Dirac–Talbot–Lau interferometer for highly polarizable molecules

Interaction of Iron(III)-5,10,15,20-Tetrakis (4-Sulfonatophenyl) Porphyrin with Chloroquine, Quinine and Quinidine

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