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Giant intrinsic circular dichroism of prolinol-derived squaraine thin films

An International study, published in Nature Communications, has provided a new small molecular benchmark material for the development of organic thin film based chiroptics. Chirality is a fundamental symmetry property describing an object such as a molecule that is non-superimposable on its mirror image. Nature has evolved with single handedness meaning that essentially all biological processes are intrinsically chiral. This is well recognized for instance in pharmacological applications, but however, the enantiopure, i.e. homochiral, synthesis of drugs remains a challenge for chemists. Combination of molecular chirality and the inherently connected circular dichroism (CD) with semiconducting properties offers great potential for chiral opto-electronics. Researchers in this work, in which Oriol Arteaga from Department of Applied Physics and IN2UB, University of Barcelona participated, assessed the temperature-controlled assembly of enantiopure prolinol functionalized squaraines with opposite handedness into intrinsically circular dichroic, molecular J-aggregates in spincasted thin films (see Figure). The results presented in this work, provide a new small molecular benchmark material for the development of organic thin film based chiroptics with a uniquely high CD rooted in a large oscillator strength of the J-type excitonic optical transitions and not to mesoscopic structural ordering.

 

Fig. Thickness normalized circular dichroic properties of ProSQ-C16 thin films

 

 

· Magnetically tunable bidirectional locomotion of a self-assembled nanorod-sphere propeller. José García-Torres, Carles Calero, Francesc Sagués, Ignacio Pagonabarraga & Pietro Tierno. Nature Communications. https://doi.org/10.1038/s41467-018-04115-w

· Change in the magnetic configurations of tubular nanostructures by tuning dipolar interactions. H. D. Salinas, J. Restrepo & Òscar IglesiasScientific Reports. https://doi.org/10.1038/s41598-018-28598-1

 

 

 

► Research Seminar

"Surfing on active carpets: Nutrients currents driven by bacterial clusters and turbulence"

By Francisca Guzmán Lastra (Physics Department, University of Chile, Santiago)

Date: 19/07/2018 at 12h
Venue: Pere Pascual Room Faculty of Physics (6th floor)

 Research Seminar

“Metalloporphyrin frameworks for a hybrid quantum computation arquitecture”

By Dr. Olivier Roubeau, CSIC-UZA - Instituto de Ciencia de Materiales de Aragon (ICMA)

Date: 17/07/2017 at 12h
Venue: Aula Magna Enric Casassas (Faculty of Chemistry)

► Research Seminar

"Birds, magnets, soap, and sandblasting: surprising connections in the theory of incompressible flocks"

by John Toner, University of Oregon

Venue: Room V12 (Faculty of Physics)
Date: July 2nd 
at 11:45h

► Research Seminar

"Programmable Self-Assembly of Nanocrystals"

By Alex Travesset, Iowa State University

Venue: Room V12 (Faculty of Physics)
Date: 27th June at 12h

► Research Seminar 

"Neuromorphic Computing"

By Ivan K. Schuller. University of California San Diego

Venue: Sala de Graus Antiga de Física
Date: May 24th; 11:45h

► Research Seminar IN2UB

"Introducing noble method of fabrication SERS substrate as a sensor to identify and measure organic pollutant"

By Mohammad Tahghighi, PhD Student. Self-organized complexity and self-assembling materials (SOC&SAM)
(Dep. Materials Science and Physical Chemistry, Fac. Chemistry).

Venue: Sala de Graus Antiga de Física
Date: 3rd May 2018 at 12h