Self-assembly into temperature dependent micro-/nano-aggregates of 5,10,15,20-tetrakis(4-carboxyl phenyl)-porphyrin

Liu, Qingyun; Zhou, Haiyang; Zhu, Ji-Qin; Yang, Yanting; Liu, Xiaodong; Wang, Dongmei; Zhang, Xiaomei; Zhuo, Linhai

doi:10.1016/j.msec.2013.08.015

Cited by 21 publications

(16 citation statements)

References 64 publications

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“…The precipitates can be redissolved back to the solution simply by the addition of acid, which breaks up the T‐Hg 2+ ‐T complex by protonation of the thymine moieties (Liu et al ., ). In addition, the absorbance spectra of 4T‐ZnP in DMF/H 2 O mixed solvent (7/3, v/v, 2.0 μM) upon addition of 0–2.5 equiv of Hg 2+ (Figure S3; see SI) as well as its reaction time profile (Figure S4; see SI) suggested that J aggregates of porphyrin were formed (Liu et al ., ).…”

Section: Resultsmentioning

confidence: 97%

“…The precipitates can be redissolved back to the solution simply by the addition of acid, which breaks up the T-Hg 2+ -T complex by protonation of the thymine moieties (Liu et al, 2009b). In addition, the absorbance spectra of 4T-ZnP in DMF/H 2 O mixed solvent (7/3, v/v, 2.0 μM) upon addition of 0-2.5 equiv of Hg 2+ (Figure S3; see SI) as well as its reaction time profile ( Figure S4; see SI) suggested that J aggregates of porphyrin were formed (Liu et al, 2013). To obtain a highly sensitive probe for Hg 2+ , the sensing behavior of 4T-ZnP toward Hg 2+ was investigated by fluorescence titration in DMF/H 2 O mixed solvent (7/3, v/v, 2.0 μM) at an excitation wavelength of 429 nm.…”

Section: Fluorescence Detection Of Hg 2+mentioning

confidence: 95%

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A highly sensitive and reversible chemosensor for Hg²⁺ detection based on porphyrin‐thymine conjugates

Yang

Chen

et al. 2015

J of Molecular Recognition

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In this study, we demonstrated a highly sensitive, selective, and reversible chemosensor for Hg(2+) determination. This chemosensor was synthesized by direct condensation of thymin-1-ylacetic acid with zinc tetraaminoporphyrin, which has a porphyrin core as the fluorophore and four thymine (T) moieties as the specific interaction sites for Hg(2+) . The probe (4T-ZnP) exhibited split Soret bands with a small peak at 408 nm and a strong band at 429 nm in a dimethylformamide/H2 O (7/3, v/v) mixed solvent as well as a strong emission band at 614 nm. Upon the addition of Hg(2+) , the probe displayed strong fluorescence quenching due to the formation of T-Hg(2+) -T complexes. With the aid of the fluorescence spectrometer, the chemosensor in the dimethylformamide/H2 O (7/3, v/v) mixed solvent (0.3 μM) exhibited a detection limit of 6.7 nM. Interferences from other common cations, such as Co(2+) , K(+) , Sn(2+) , Zn(2+) , Cu(2+) , Ni(2+) , Mn(2+) , Na(+) , Ca(2+) , Mg(2+) , Pb(2+) , and Cd(2+) , associated with Hg(2+) analysis were effectively inhibited.

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Section: Resultsmentioning

confidence: 97%

Section: Fluorescence Detection Of Hg 2+mentioning

confidence: 95%

A highly sensitive and reversible chemosensor for Hg²⁺ detection based on porphyrin‐thymine conjugates

Yang

Chen

et al. 2015

J of Molecular Recognition

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“…A great variety of organic, [41][42][43] inorganic 44 and composite materials 45 was obtained via the bottom-up approach by using polymers, small synthetic and biological molecules, amphiphiles, graphene and other components as building blocks. Of particular interest of organic self-assembly is that many of such systems, including DNA, 46 peptides 47 and amphiphiles, 48,49 exhibit temperature metamor- Here we present an example based on the work of Denkov et al 51 Hexadecane droplets in water (containing appropriate surfactant) spontaneously change their morphology several times, generating series of complex regular shapes owing to the internal phase-transition processes (Fig. 8).…”

Section: Self-shaping Of Oil Droplets Upon Coolingmentioning

confidence: 98%

A temperature-controlled stage for laser scanning confocal microscopy and case studies in materials science

2018

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If confocal microscopy is an ubiquitous tool in life science, its applications in chemistry and materials science are still, in comparison, very limited. Of particular interest in these domains is the use of confocal microscopy to investigate temperature-dependent phenomena such as self-assembly, diffusio- or thermophoresis, or crystal growth. Several hurdles must be solved to develop a temperature-controlled stage for laser scanning confocal microscopy, in particular regarding the influence of an elevated temperature gradient close to the microscope objective, which most people try very hard to avoid. Here we report the design of a temperature-controlled stage able to generate stable temperature gradients in both positive and negative temperature range and does not require use of liquid nitrogen. Our setup provides an excellent control of the temperature gradient, which can be coupled with a controlled displacement of the sample, making it useful in particular for a variety of solidification, chemistry, and interfacial problems. We illustrate the benefits of our setup with several case studies of interest in chemistry and materials science: the 3D real-time imaging of ice growth, the segregation of hard particles by growing crystals, the freezing behaviour of single emulsions, the self-shaping of oil droplets upon cooling, and the self-assembly of amphiphile molecules into helical structures. These results show how confocal microscopy coupled with a temperature-controlled stage that provides a controlled temperature gradient is a welcome addition to the toolkit of chemists and materials scientists.

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“…From these examples it becomes clear that porphyrins are highly interesting molecules for a generation of supramolecular architectures. However, their complex assembly behaviour can give rise to a variety of self‐assembled architectures from the same molecular structure . Furthermore, small changes in the molecular architecture or coordinated metal frequently result in the formation of different types of aggregates .…”

Section: Introductionmentioning

confidence: 99%

Directing the Self‐Assembly Behaviour of Porphyrin‐Based Supramolecular Systems

Weegen

Teunissen

Meijer

2017

Chemistry A European J

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The self-assembly behaviour of a library of tetra-amidated porphyrin molecules decorated with a variety of solubilizing wedges is investigated as dilute solutions in methylcyclohexane. Small changes in the solubilising wedge of the porphyrins resulted in different aggregated states, as evidenced by CD and UV/Vis absorption spectroscopy. The porphyrins form co-facially stacked H-aggregates, slip-stacked J-aggregates or a mixture of both. Detailed thermodynamic and kinetic analysis showed that in all cases the formation of J-aggregates proceeds via an isodesmic mechanism whereas H-aggregates are formed via a cooperative mechanism. It is shown that these aggregates assemble in a parallel pathway, in which both compete for the monomer, compared to a sequential pathway, in which one of the aggregates interconverts into the other. Interestingly, kinetic analysis of porphyrins that only form H-aggregates in thermodynamic equilibrium revealed that the competing pathway towards J-aggregates is operational in these systems as well. Our findings show that the balance between H- and J-aggregates depends on remarkably small changes in the architecture of the solubilising wedges.

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Self-assembly into temperature dependent micro-/nano-aggregates of 5,10,15,20-tetrakis(4-carboxyl phenyl)-porphyrin

Cited by 21 publications

References 64 publications

A highly sensitive and reversible chemosensor for Hg²⁺ detection based on porphyrin‐thymine conjugates

A highly sensitive and reversible chemosensor for Hg²⁺ detection based on porphyrin‐thymine conjugates

A temperature-controlled stage for laser scanning confocal microscopy and case studies in materials science

Directing the Self‐Assembly Behaviour of Porphyrin‐Based Supramolecular Systems

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Self-assembly into temperature dependent micro-/nano-aggregates of 5,10,15,20-tetrakis(4-carboxyl phenyl)-porphyrin

Cited by 21 publications

References 64 publications

A highly sensitive and reversible chemosensor for Hg2+ detection based on porphyrin‐thymine conjugates

A highly sensitive and reversible chemosensor for Hg2+ detection based on porphyrin‐thymine conjugates

A temperature-controlled stage for laser scanning confocal microscopy and case studies in materials science

Directing the Self‐Assembly Behaviour of Porphyrin‐Based Supramolecular Systems

Contact Info

Product

Resources

About

A highly sensitive and reversible chemosensor for Hg²⁺ detection based on porphyrin‐thymine conjugates

A highly sensitive and reversible chemosensor for Hg²⁺ detection based on porphyrin‐thymine conjugates