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

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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β-Pyrrole brominated meso-tetraphenylporphyrins: synthesis, spectral and electrochemical properties

Journal of Porphyrins and Phthalocyanines ◽

10.1142/s1088424604000192 ◽

2004 ◽

Vol 08 (02) ◽

pp. 201-214 ◽

Cited By ~ 20

Author(s):

Zhongping Ou ◽

Jianguo Shao ◽

Francis D'Souza ◽

Pietro Tagliatesta ◽

Karl M. Kadish

Keyword(s):

Electrochemical Properties ◽

Catalytic Properties ◽

Redox Behavior ◽

Porphyrin Ring ◽

Visible Spectra ◽

Uv Visible ◽

Spectral And Electrochemical Properties

The synthesis, catalytic properties, UV-visible spectra and electrochemistry of β-pyrrole brominated porphyrins are summarized in this brief review. The effect of the Br substituents of the porphyrin ring on the redox behavior, and on axial CO or pyridine binding to the porphyrins is also discussed.

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

Journal of Porphyrins and Phthalocyanines ◽

10.1142/s1088424610002859 ◽

2010 ◽

Vol 14 (12) ◽

pp. 1027-1033 ◽

Cited By ~ 3

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.

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Novel Approaches to Low-Voltage Scanning Electron Microscopy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100180586 ◽

1990 ◽

Vol 48 (1) ◽

pp. 366-367

Author(s):

Arthur V. Jones

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Low Voltage ◽

Electron Optics ◽

Current Interest ◽

New Concepts ◽

Opportune Time ◽

Novel Approaches ◽

Voltage Scanning ◽

Scanning Electron

In comparison with the developers of other forms of instrumentation, scanning electron microscope manufacturers are among the most conservative of people. New concepts usually must wait many years before being exploited commercially. The field emission gun, developed by Albert Crewe and his coworkers in 1968 is only now becoming widely available in commercial instruments, while the innovative lens designs of Mulvey are still waiting to be commercially exploited. The associated electronics is still in general based on operating procedures which have changed little since the original microscopes of Oatley and his co-workers.The current interest in low-voltage scanning electron microscopy will, if sub-nanometer resolution is to be obtained in a useable instrument, lead to fundamental changes in the design of the electron optics. Perhaps this is an opportune time to consider other fundamental changes in scanning electron microscopy instrumentation.

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Infrared and UV-visible spectra of layer semiconductors Gas, GaSe and GaTe

Journal de Physique ◽

10.1051/jphys:0197700380100129300 ◽

1977 ◽

Vol 38 (10) ◽

pp. 1293-1299 ◽

Cited By ~ 18

Author(s):

U. Giorgianni ◽

G. Mondio ◽

P. Perillo ◽

G. Saitta ◽

G. Vermiglio

Keyword(s):

Visible Spectra ◽

Uv Visible

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Electrostatic Adhesion Testing for the Evaluation of Metallization Adhesion

MRS Proceedings ◽

10.1557/proc-473-63 ◽

1997 ◽

Vol 473 ◽

Author(s):

H. S. Yang ◽

F. R. Brotzen ◽

D. L. Callahan ◽

C. F. Dunn

Keyword(s):

Thin Film ◽

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Distribution Function ◽

Quantitative Measurement ◽

Multilayer Films ◽

Adhesion Testing ◽

Novel Technique ◽

Electrostatic Adhesion ◽

Scanning Electron

ABSTRACTQuantitative measurement of the adhesion strength of thin film metallizations has been achieved by a novel technique employing electrostatic forces to generate delaminating stresses. This technique has been used in testing the adhesion of Al-Cu, Cu, and Al multilayer films deposited on Si. Micro-blister-type failure is revealed by scanning electron microscopy. The delamination process and the geometry of the blister are discussed. The measured adhesion data fit a Weibull distribution function.

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Effect of NO2 substitution and solvent on UV-visible spectra, redox potentials and electron transfer mechanisms of copper β-nitrotriarylcorroles. Proposed electrogeneration of a Cu(I) oxidation state

Journal of Porphyrins and Phthalocyanines ◽

10.1142/s1088424616500899 ◽

2016 ◽

Vol 20 (07) ◽

pp. 753-765 ◽

Cited By ~ 2

Author(s):

Lina Ye ◽

Zhongping Ou ◽

Yuanyuan Fang ◽

Yang Song ◽

Bihong Li ◽

...

Keyword(s):

Absorption Spectra ◽

Soret Band ◽

Redox Potentials ◽

Nonaqueous Media ◽

Initial Assignment ◽

Visible Spectra ◽

Phenyl Rings ◽

Uv Visible ◽

Electron Reduction ◽

Transfer Mechanisms

Three copper triarylcorroles containing a [Formula: see text]-pyrrole nitro substituent were synthesized and characterized as to their spectral and electrochemical properties in nonaqueous media. The examined compounds are represented as [Formula: see text]-NO2(YPh)3CorCu, where Cor is the trianion of a triphenylcorrole and Y is a Cl, H or CH3 substituent at the para-position of the three meso-phenyl rings of the compound. The data from absorption spectra, electrochemistry and thin-layer spectroelectrochemistry are consistent with an initial assignment of Cu[Formula: see text]-Cor[Formula: see text] in CH2Cl2, DMF and pyridine and electrogeneration of a formal Cu(II) corrole with an unreduced macrocycle, represented as Cu[Formula: see text]-Cor[Formula: see text], after the first one-electron reduction in these solvents. The doubly reduced [Formula: see text]-nitrocorrole has a sharp Soret band at 439 nm and a well-defined Q-band at 611 nm in CH2Cl2. Similar absorption spectra are seen for the three examined doubly reduced nitrocorroles in DMF and pyridine, suggesting formation of a Cu(I) species with an unreduced macrocycle which is represented as Cu[Formula: see text]-Cor[Formula: see text]. Changes in redox potentials and absorption spectra of the nitrocorroles are examined as a function of solvent and substituents on the meso-phenyl rings of the compounds and comparisons are made between spectral and electrochemical data of the newly synthesized corroles and that of structurally related tetraarylcorroles lacking a [Formula: see text]-nitro group.

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Synthesis, Characterization, and Biological Studies of a Piperidinyl Appended Dipicolylamine Ligand and Its Rhenium Tricarbonyl Complex as Potential Therapeutic Agents for Human Breast Cancer

Bioinorganic Chemistry and Applications ◽

10.1155/2016/2675937 ◽

2016 ◽

Vol 2016 ◽

pp. 1-10 ◽

Cited By ~ 4

Author(s):

Amali Subasinghe ◽

Inoka C. Perera ◽

Svetlana Pakhomova ◽

Theshini Perera

Keyword(s):

Breast Cancer ◽

Anticancer Agents ◽

Human Breast Cancer ◽

Human Breast ◽

Tricarbonyl Complex ◽

Nmr Spectrum ◽

H Nmr ◽

Biological Studies ◽

Visible Spectra ◽

Uv Visible

A novel ligand bearing a central piperidinyl sulfonamide group, N(SO2pip)dpa, and its corresponding Re tricarbonyl complex, [Re(CO)3(N(SO2pip)dpa)]+, have been synthesized in good yield. The methylene CH2signal seen as a singlet (4.54 ppm) in a1H NMR spectrum of the ligand in DMSO-d6appears as two doublets (5.39, 5.01 ppm) in a spectrum of the [Re(CO)3(N(SO2pip)dpa)]+complex and confirms the presence of magnetically nonequivalent protons upon coordination to Re. Structural results revealed that the Re–N bond lengths fall within the normal range establishing coordination of ligand to metal. The presence of intraligandπ→π⁎andn→π⁎transitions is indicated by the absorption peaks around 200–250 nm in UV-visible spectra. Absorption peaks in UV-visible spectra around 300 nm for metal complexes were identified as MLCT transitions. The S–N stretch observed as a strong peak at 923 cm−1for N(SO2pip)dpa appeared at a shorter frequency, at 830 cm−1in an FTIR spectrum of the [Re(CO)3(N(SO2pip)dpa)]+. The intense fluorescence displayed by the N(SO2pip)dpa ligand has quenched upon coordination to Re. Relatively low IC50values given by human breast cancer cells, MCF-7, (N(SO2pip)dpa = 139 μM, [Re(CO)3(N(SO2pip)dpa)]+= 360 μM) indicate that N(SO2pip)dpa and [Re(CO)3(N(SO2pip)dpa)]+are promising novel compounds that can be further investigated on their usage as potential anticancer agents.

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