Navigation Links
Chemists demonstrate 'bricks-and-mortar' assembly of new molecular structures
Date:7/31/2014

BLOOMINGTON, Ind. -- Chemists at Indiana University Bloomington have described the self-assembly of large, symmetrical molecules in bricks-and-mortar fashion, a development with potential value for the field of organic electronic devices such as field-effect transistors and photovoltaic cells.

Their paper, "Anion-Induced Dimerization of 5-fold Symmetric Cyanostars in 3D Crystalline Solids and 2D Self-Assembled Crystals," has been published online by Chemical Communications, a journal of the Royal Society of Chemistry. It is the first collaboration by Amar Flood, the James F. Jackson Associate Professor of Chemistry, and Steven L. Tait, assistant professor of chemistry. Both are in the materials chemistry program in the IU Bloomington Department of Chemistry, part of the College of Arts and Sciences.

The article will appear as the cover article of an upcoming issue of the journal. The cover illustration was created by Albert William, a lecturer in the media arts and science program of the School of Informatics and Computing at Indiana University-Purdue University Indianapolis. William specializes in using advanced graphics and animation to convey complex scientific concepts.

Lead author of the paper is Brandon Hirsch, who earned the cover by winning a poster contest at the fall 2013 meeting of the International Symposium on Macrocyclic and Supramolecular Chemistry. Co-authors, along with Flood and Tait, include doctoral students Semin Lee, Bo Qiao and Kevin P. McDonald and research scientist Chun-Hsing Chen.

The researchers demonstrate the self-assembly and packing of a five-sided, symmetrical molecule, called cyanostar, that was developed by Flood's IU research team. While researchers have created many such large, cyclic molecules, or macrocycles, cyanostar is unusual in that it can be readily synthesized in a "one pot" process. It also has an unprecedented ability to bind with large, negatively charged anions such as perchlorate.

"This great piece of work, with state-of-the-art studies of the assembly of some beautiful compounds pioneered by the group in Indiana, shows how anions can help organize molecules that could have very interesting properties," said David Amabilino, nanomaterials group leader at the Institute of Materials Science of Barcelona. "Symmetry is all important when molecules pack together, and here the supramolecular aspects of these compounds with a very particular shape present tantalizing possibilities. This research is conceptually extremely novel and really interdisciplinary: It has really unveiled how anions could help pull molecules together to behave in completely new ways."

The paper describes how cyanostar molecules bind with anions in 2-to-1 sandwich-like complexes, with anions sandwiched between two saucer-shaped cyanostars. The study shows the packing of the molecules in repeating patterns reminiscent of the two-dimensional packing of pentagons shown by artist Albrecht Durer in 1525. It further shows the packing to take place not only at but away from the surface of materials.

The future of organic electronics will rely upon packing molecules onto electrode surfaces, yet it has been challenging to get packing of the molecules away from the surface, Tait and Flood said. With this paper, they present a collaborative effort, combining their backgrounds in traditionally distinct fields of chemistry, as a new foray to achieve this goal using a bricks-and-mortar approach.

The paper relies on two complementary technologies that provide high-resolution images of molecules:

  • X-ray crystallography, which is being celebrated worldwide for its invention 100 years ago, can provide images of molecules from analysis of the three-dimensional crystalline solids.
  • Scanning tunneling microscopy, or STM, developed in 1981, shows two-dimensional packing of molecules immobilized on a surface.

The results are distinct, with submolecular views of the star-shaped molecules that are a few nanometers in diameter. (A human hair is about 100,000 nanometers thick).


'/>"/>

Contact: Steve Hinnefeld
slhinnef@iu.edu
812-856-3488
Indiana University
Source:Eurekalert  

Related biology technology :

1. Chemists become molecular sculptors, synthesizing tiny, molecular traps
2. University of Utah chemists use nanopores to detect DNA damage
3. Chemists develop innovative nano-sensors for multiple proteins
4. Oregon chemists eye improved thin films with metal substitution
5. NKTR-102 Demonstrates Synergistic Anti-Tumor Activity in Combination with Pegylated Liposomal Doxorubicin in Platinum-Resistant Ovarian Cancer
6. S*BIOs Novel JAK2 Inhibitor Pacritinib (SB1518) and Histone Deacetylase Inhibitor Pracinostat (SB939) Demonstrate Promising Activity in Phase 2 Studies for Patients with Myelofibrosis (MF)
7. AtheroNova Inc. Preclinical Study Demonstrates 95% Reduction in Arterial Plaque Formation
8. Post Heart Attack Recovery Not Aided By Stem Cell Injections, But Trial Demonstrates Promise
9. UCLA researchers demonstrate fully printed carbon nanotube transistor circuits for displays
10. Penn and Brown researchers demonstrate earthquake friction effect at the nanoscale
11. Entinostat Demonstrates Activity in Hodgkins Lymphoma
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Chemists demonstrate 'bricks-and-mortar' assembly of new molecular structures
(Date:2/27/2017)... ... February 27, 2017 , ... The Catalyst Midwest premix manufacturing ... Midwest offering premix services and private label organic services. , The first organic product ... Zamzow, chief operating officer of Dynamite Marketing, which owns the facility. , Catalyst already ...
(Date:2/25/2017)... ... February 25, 2017 , ... The STARR Coalition ... effort to create meaningful change by increasing communication, partnerships and goodwill among stakeholders ... and patients’ mental health well-being. , Both organizations are dedicated to promoting patient ...
(Date:2/24/2017)... CA (PRWEB) , ... February 24, 2017 , ... Delpor, ... a $224K grant from the National Institute of Mental Health (NIMH) for the further ... on Delpor’s PROZOR technology and is expected to deliver therapeutic levels of ...
(Date:2/24/2017)... 2017 Provectus Biopharmaceuticals, Inc. (OTCQB: PVCT, ... clinical-stage oncology and dermatology biopharmaceutical company, today is ... in its previously announced rights offering of up ... common stock and Series C Convertible Preferred Stock ... As previously announced, the rights ...
Breaking Biology Technology:
(Date:2/14/2017)... , Feb. 14, 2017  Wake Forest Baptist Medical ... its new chief executive officer (CEO). Freischlag joins the ... John D. McConnell , M.D., who last year announced ... the Medical Center, after leading it since 2008.   ... scope of Wake Forest Baptist,s academic health system, which ...
(Date:2/9/2017)... , Feb. 9, 2017 The biomass boiler ... of the biomass boiler market globally in terms of ... biomass boilers. The market for biomass boilers has been ... end-user, application, and country/region. The market based on feedstock ... forest residues, biogas & energy crops, urban residues, and ...
(Date:2/8/2017)... YORK , Feb. 7, 2017 ... Driven largely by the confluence of organizations, desires ... distaste for knowledge-based systems (password and challenge questions), ... industrial, and government systems. The market is driven ... a demarcation between consumer and enterprise uses cases, ...
Breaking Biology News(10 mins):