Amine-sensing properties of a covalently linked calix[4]arene–porphyrin ("calixporph") multilayered film

2010 ◽  
Vol 14 (12) ◽  
pp. 1027-1033 ◽  
Author(s):  
Stuart A. Brittle ◽  
Tim H. Richardson ◽  
Lisa Varley ◽  
Chris A. Hunter
Keyword(s):  
Figure Of Merit ◽  
Zinc Porphyrin ◽  
Langmuir Blodgett ◽  
Enhanced Sensitivity ◽  
Visible Spectra ◽  
Two Component ◽  
Langmuir Blodgett Films ◽  
High Figure ◽  
Uv Visible ◽  
Covalently Linked

Four zinc porphyrin molecules have been linked covalently to a central amphiphilic calix[4]arene molecule to form a zinc "calixporph", ZnCP , which displays enhanced sensitivity to dibutylamine compared to both the discrete zinc porphyrin and two-component mixtures of zinc porphyrin with calixarene. Langmuir-Blodgett films (20 monolayers) of ZnCP display UV-visible spectra which are modified upon exposure to dibutylamine in the concentration range 0.09–0.45 ppt (in N2 ) with a t50 response time of 8.8 s. The dense packing of the monomeric porphyrin moieties leads to a high absorbance per layer and thus a large sensing signal compared to other LB films capable of amine-detection. This, coupled to the very fast t50 value, leads to a high figure of merit. This verifies the adopted strategy of using a covalently linked calixporph in order to avoid the potential problems of phase separation associated with two-component mixtures. Furthermore, the ZnCP is selectively responsive to the secondary amine, dibutylamine, compared to the primary and tertiary compounds.

Redox Active Two-Component Films of Palladium and Covalently Linked Zinc Porphyrin–Fullerene Dyad

2006 ◽  
Vol 18 (9) ◽  
pp. 841-848 ◽  
Author(s):  
Marta Plonska ◽  
Krzysztof Winkler ◽  
Suresh Gadde ◽  
Francis D'Souza ◽  
Alan L. Balch
Keyword(s):  
Zinc Porphyrin ◽  
Redox Active ◽  
Two Component ◽  
Covalently Linked

Langmuir−Blodgett Films of a Cationic Zinc Porphyrin−Imidazole-Functionalized Fullerene Dyad:  Formation and Photoelectrochemical Studies

Langmuir ◽  
2007 ◽  
Vol 23 (4) ◽  
pp. 1917-1923 ◽  
Author(s):  
Renata Marczak ◽  
Vito Sgobba ◽  
Wlodzimierz Kutner ◽  
Suresh Gadde ◽  
Francis D'Souza ◽  
...  
Keyword(s):  
Zinc Porphyrin ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films ◽  
Photoelectrochemical Studies

scholarly journals Plasmon-Waveguide Resonances with Enhanced Figure of Merit and Their Potential for Anisotropic Biosensing in the Near Infrared Region

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Said Mahajna ◽  
Michal Neumann ◽  
Ofer Eyal ◽  
Atef Shalabney
Keyword(s):  
Figure Of Merit ◽  
Near Infrared ◽  
Propagation Distance ◽  
Infrared Region ◽  
Enhanced Sensitivity ◽  
Guided Modes ◽  
Order Of Magnitude ◽  
High Figure ◽  
Near Infrared Region ◽  
Waveguide Resonance

The TM and TE guided modes in the coupled plasmon-waveguide resonance configuration are investigated in the spectral domain. Here we use the modes dispersion to study their capability for sensing in the near infrared region. It is shown that the spectral widths of the guided modes are, at least, one order of magnitude smaller than the conventional surface plasmon resonance counterpart. The enhanced sensitivity and figure of merit of the guided modes reveal their potential for sensing in the spectral interrogation method where the traditional configurations are inherently limited. Moreover, the high resolution associated with the narrow resonances and the polarization dependence make these modes very promising for anisotropic biosensing in the spectral interrogation approach. The extremely high figure of merit, large penetration depth, and propagation distance in the near infrared region open the possibility of combining the plasmon-waveguide configuration with absorption spectroscopy techniques for molecular recognition.

The Micro-Patterning of Polymer in the Presence of Porphyrin via Electrospinning

2007 ◽  
Vol 121-123 ◽  
pp. 653-656 ◽  
Author(s):  
Y.W. Jin ◽  
W. Liu ◽  
Yi Yang Zhao ◽  
C. Wang
Keyword(s):  
Catalytic Properties ◽  
Electrospinning Process ◽  
Current Interest ◽  
Zinc Porphyrin ◽  
Operational Conditions ◽  
Novel Technique ◽  
Micro Patterning ◽  
Visible Spectra ◽  
Uv Visible ◽  
Scanning Electron

Functional self-assembled structure with well-defined shapes and dimensions are of great current interest. Porphyrins are attractive building manifold patterning for these structures because of their electronic, optical, and catalytic properties. In this paper, we report a novel technique for the assembly patterning of polymers. An Electrospinning process was used to create patterning with diameter ranging from 3 μm to 4 μm and length of up to several hundred micrometers in the presence of Zinc Porphyrin. Scanning electron microscopy (SEM), UV- visible spectra and EDX spectra were used to characterize the patterning. The results indicated that the patterning depended on the concentration of Porphyrin and the operational conditions.

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