A fluoride-selective colorimetric and fluorescent chemosensor and its use for the design of molecular-scale logic devices

2011 ◽  
Vol 160 (1) ◽  
pp. 1005-1010 ◽  
Author(s):  
Wei Lu ◽  
Mengyu Zhang ◽  
Keyuan Liu ◽  
Bin Fan ◽  
Zheng Xia ◽  
...  
Keyword(s):  
Fluorescent Chemosensor ◽  
Logic Devices ◽  
Molecular Scale

A cyanide-selective colorimetric “naked-eye” and fluorescent chemosensor based on a diketopyrrolopyrrole–hydrazone conjugate and its use for the design of a molecular-scale logic device

RSC Advances ◽  
2016 ◽  
Vol 6 (99) ◽  
pp. 96676-96685 ◽  
Author(s):  
Lingyun Wang ◽  
Xianggen Chen ◽  
Derong Cao
Keyword(s):  
Aqueous Media ◽  
Fluorescent Chemosensor ◽  
Logic Device ◽  
Naked Eye ◽  
Colorimetric Chemosensor ◽  
Molecular Scale

A novel diketopyrrolopyrrole (DPP)–hydrazone based receptor was designed and synthesized as a selective fluorescent and colorimetric chemosensor for cyanide in aqueous media via deprotonation between the hydrazide moiety of the probe and cyanide.

A highly selective colorimetric and “Off–On” fluorescent chemosensor for fluoride ions and its application as a molecular-scale logic device

2015 ◽  
Vol 39 (11) ◽  
pp. 8797-8801 ◽  
Author(s):  
GuoTao Yan ◽  
Hui Li ◽  
Yuan Rong Zhu ◽  
BingBing Shi ◽  
Wenjuan Qu ◽  
...  
Keyword(s):  
High Selectivity ◽  
Fluorescent Sensor ◽  
Fluorescent Chemosensor ◽  
Logic Device ◽  
Fluoride Ions ◽  
Turn On ◽  
Molecular Scale ◽  
Phenolic Hydroxy

A new sensor based on phenolic hydroxy and imine groups was used as an efficient colorimetric and “turn on” fluorescent sensor, which exhibited high selectivity and sensitivity for F−.

STM of freeze-fracture replicas: Problems and promises

1993 ◽  
Vol 51 ◽  
pp. 68-69
Author(s):  
J. T. Woodward ◽  
J. A. N. Zasadzinski
Keyword(s):  
Scanning Tunneling Microscope ◽  
Organic Materials ◽  
Freeze Fracture ◽  
Atomic Resolution ◽  
Scanning Tunneling ◽  
Tunneling Microscope ◽  
Molecular Scale ◽  
Organic Surfaces ◽  
Metal Layers ◽  
Conductive Surfaces

The Scanning Tunneling Microscope (STM) offers exciting new ways of imaging surfaces of biological or organic materials with resolution to the sub-molecular scale. Rigid, conductive surfaces can readily be imaged with the STM with atomic resolution. Unfortunately, organic surfaces are neither sufficiently conductive or rigid enough to be examined directly with the STM. At present, nonconductive surfaces can be examined in two ways: 1) Using the AFM, which measures the deflection of a weak spring as it is dragged across the surface, or 2) coating or replicating non-conductive surfaces with metal layers so as to make them conductive, then imaging with the STM. However, we have found that the conventional freeze-fracture technique, while extremely useful for imaging bulk organic materials with STM, must be modified considerably for optimal use in the STM.

Oriented Luminescent Nanostructures From Single Molecules Of Conjugated Polymers

2003 ◽  
Vol 771 ◽  
Author(s):  
Adosh Mehta ◽  
Pradeep Kumar ◽  
Jie Zheng ◽  
Robert M. Dickson ◽  
Bobby Sumpter ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Polarization Anisotropy ◽  
Emission Pattern ◽  
Spectral Signatures ◽  
Dipole Emission ◽  
Ink Jet ◽  
Molecular Scale ◽  
Jet Printing ◽  
Photochemical Stability ◽  
Printing Techniques

AbstractDipole emission pattern imaging experiments on single chains of common conjugated polymers (solubilized poly phenylene vinylenes) isolated by ink-jet printing techniques have revealed surprising uniformity in transition moment orientation perpendicular to the support substrate. In addition to uniform orientation, these species show a number of striking differences in photochemical stability, polarization anisotropy,[1] and spectral signatures[2] with respect to similar (well-studied) molecules dispersed in dilute thin-films. Combined with molecular mechanics simulation, these results point to a structural picture of a folded macromolecule as a highly ordered cylindrical nanostructure whose long-axis (approximately collinear with the conjugation axis) is oriented, by an electrostatic interaction, perpendicular to the coverglass substrate. These results suggest a number of important applications in nanoscale photonics and molecular-scale optoelectronics.

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