scholarly journals Mapping the Chiroptical Properties of Local Domains in Thin Films of Chiral Silicon Phthalocyanines by CD Imaging

Molecules ◽  
2020 ◽  
Vol 25 (24) ◽  
pp. 6048
Author(s):  
Dora-M. Răsădean ◽  
Tiberiu-M. Gianga ◽  
Tamás Jávorfi ◽  
Rohanah Hussain ◽  
Giuliano Siligardi ◽  
...  
Keyword(s):  
Thin Films ◽  
Circular Dichroism ◽  
Spatial Resolution ◽  
Supramolecular Assemblies ◽  
Chiroptical Properties ◽  
Chemical Functionalization ◽  
Silicon Phthalocyanines ◽  
Homogenous Distribution ◽  
Circular Dichroïsm

The first example of uniformly chiral thin films of silicon phthalocyanines (SiPcs) are reported. The local domains of the films are mapped using circular dichroism (CD) imaging (CDi) technique available at the Diamond B23 beamline. The CDi allowed us to increase the spatial resolution up to 525× when compared with benchtop spectrometers. The results indicate formation on-surface of chiral and stable supramolecular assemblies with homogenous distribution. Chemical functionalization and solvent choice for deposition allow controllable chiroptical properties to be obtained. The method and technique reported in this work could be applied to prepare and characterize a wide variety of chiral thin films.

X‐ray magnetic circular dichroism studies of multilayered thin films of 3d transition metals (invited) (abstract)

1994 ◽  
Vol 75 (10) ◽  
pp. 5807-5807 ◽  
Author(s):  
D. Weller ◽  
M. G. Samant ◽  
J. Stöhr ◽  
Y. Wu ◽  
B. D. Hermsmeier ◽  
...  
Keyword(s):  
Thin Films ◽  
Circular Dichroism ◽  
Transition Metals ◽  
Magnetic Circular Dichroism ◽  
X Ray ◽  
Multilayered Thin Films ◽  
Circular Dichroïsm

Preparation of Polypeptide-Dye Multilayers by an Electrostatic Assembly Process

1994 ◽  
Vol 351 ◽  
Author(s):  
Thomas M. Cooper ◽  
L. Campbell Angela ◽  
Carol Noffsinger ◽  
Janelle Gunther-Greer ◽  
Robert L. Crane ◽  
...  
Keyword(s):  
Thin Films ◽  
Circular Dichroism ◽  
Glutamic Acid ◽  
Congo Red ◽  
Copper Phthalocyanine ◽  
Electrostatic Assembly ◽  
Amino Silane ◽  
Spectrum Characteristic ◽  
Circular Dichroïsm ◽  
Β Sheet

ABSTRACTTo develop novel optical thin films, we have prepared self-assembled polypeptide films by an electrostatic process. The films were placed on a glass slide previously silanized by an amino silane and given a positive charge by immersion in aqueous acid. Subsequent immersion of the slide in aqueous anionic solutions of either poly(L-glutamic acid), congo red, copper phthalocyanine tetrasulfonic acid or p-nitroaniline-modified poly(L-glutamic acid) resulted in deposition of the anions on the surface. Following anionic immersion, the slides were dipped into a cationic poly(L-lysine) solution. Alternate dipping into anionic and cationic solutions yielded multilayers. The thin films were characterized by optical absorption and circular dichroism. The optical density increased with dipping cycles. Circular dichroism measurements of the thin films showed induced dichroism of the congo red and phthalocyanine-containing films, suggesting formation of a locally ordered dye-polypeptide complex. Solution circular dichroism measurements of the polypeptides indicated a coil conformation, while poly(Lglutamic acid)/poly(L-lysine) complexes showed circular dichroism spectrum characteristic of a β-sheet.

Magnetic Structure of Multilayers from Soft-X-Ray Magnetic Circular Dichroism

1994 ◽  
Vol 375 ◽  
Author(s):  
C. T. Chen ◽  
Y. U. Idzerda ◽  
C.-C. Kao ◽  
L. H. Tjeng ◽  
H.-J. Lin ◽  
...  
Keyword(s):  
Thin Films ◽  
Circular Dichroism ◽  
Magnetic Circular Dichroism ◽  
Magnetic Thin Films ◽  
X Rays ◽  
X Ray ◽  
Specific Manner ◽  
Left And Right ◽  
The Difference ◽  
Circular Dichroïsm

AbstractSoft-x-ray magnetic circular dichroism (MCD) is the difference between the absorptivity or reflectivity of left and right circularly polarized soft-x-rays at the magnetically interesting L2,3- edges of 3d transition metals or the M4,5-edges of the 4f rare earth elements. Thanks to its large absorption cross-section and strong MCD effect, this technique has become a powerful new means for probing, in an element- and site-specific manner, the magnetic properties of ultra-thin films and multilayers. Soft-x-ray MCD experiments, recently conducted at the Dragon beamline, are utilized to demonstrate the recent progress in this technique and its applications in the research of magnetic thin films.

Irradiation induced ferromagnetism at room temperature in TiO2 thin films: X-ray magnetic circular dichroism characterizations

2011 ◽  
Vol 98 (19) ◽  
pp. 192512 ◽  
Author(s):  
Hardeep Thakur ◽  
P. Thakur ◽  
Ravi Kumar ◽  
N. B. Brookes ◽  
K. K. Sharma ◽  
...  
Keyword(s):  
Thin Films ◽  
Circular Dichroism ◽  
Room Temperature ◽  
Magnetic Circular Dichroism ◽  
Tio2 Thin Films ◽  
X Ray ◽  
Circular Dichroïsm

Magnetic circular dichroism of FexCo1−x alloy single crystal thin films (abstract)

1993 ◽  
Vol 73 (10) ◽  
pp. 5346-5346
Author(s):  
Y. U. Idzerda ◽  
C. J. Gutierrez ◽  
L. H. Tjeng ◽  
L.‐J. Lin ◽  
G. Meigs ◽  
...  
Keyword(s):  
Thin Films ◽  
Circular Dichroism ◽  
Single Crystal ◽  
Magnetic Circular Dichroism ◽  
Alloy Single Crystal ◽  
Circular Dichroïsm
Sign in / Sign up

Export Citation Format

Share Document