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2019 Committee Officer and Member Roster


Chair

John Sleckman
Queensborough Community College
Department of Chemistry
222-05 56th Avenue
Bayside, NY 11364
718-631-6939
Email

Chair-Elect

Dr. Daniel Amarante
Stony Brook University
Department of Chemistry
100 Nicolls Road
Stony Brook, NY 11794
631-632-2043
Email

Secretary

Terry Brack
Hofstra University
Department of Chemistry
Hempstead, NY 11549-0151
516-463-5539
Email

Treasurer

Philip Mark
Nassau Community College
Department of Chemistry
One Education Drive
Garden City, NY 11530
Email


Directors
Terrence M. Black
Sujun Wei
Rakhi Agarwal



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American Chemical Society
New York Section, Inc.
Department of Chemistry
St. John's University
8000 Utopia Parkway
Jamaica, NY 11439
Phone 516-883-7510
Fax 516-883-4003

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Our monthly seminars cover a broad range of topics and are open to all.
Students are encouraged to attend.

Queensborough Community College
Science Building, Room S-112
Directions
Social: 5:30 pm Seminar: 6:00 PM
Cost: Seminar is free and open to all
Dinner: Following at a nearby restaurant ($25)

Video from September 2015 seminar Chocolate: Food of the Gods



2020 Meetings

February 6Synchrotron Views of Transition Elements: Understanding Neurodegeneration and Nanostructures
Qui Wang, Nassau Community College
Flyer

Transition elements feature varied electronic and structural properties and have great importance in both biological and chemical systems. The interplay among the atoms of these elements and others leads to rich behaviors and surprising functions. For example, traces of metallic ion-contained proteins play essential roles for the biological metabolisms while the excess or deficiency may disrupt the normalities. Dr. Wang will present the evidence that metal accumulation is associated with protein misfolding, which has been believed to be a critical factor in neurodegenerative disorders (Alzheimers disease, Scrapie, etc.). The work highlighted the utilization of synchrotron-based x-ray fluorescence (XRF), in situ imaging metal(notably Cu, Fe, Zn) ion distributions, concentrations and oxidation states as the function of disease severity (using an animal model). The results were spatially and temporally correlated with the secondary structure of proteins (alpha-helices vs. beta-sheets) in the same tissue samples by applying synchrotron Fourier transform infrared microspectroscopy (FTIRM). The coordinated analysis of metal species and protein conformations shed light on the association between metal dyshomostasis and neurodegeneration. In the second example, I will discuss an investigation of the nanostructures involved with transition metals (eg. Pt, Pd). We have conducted the research aimed at the fundamental understanding of nanoparticles by examining the electronic attributes, structural parameters (particle size, shape) and thermal behaviors. In this regard, a third synchrotron-based technique, X-ray fine structure spectroscopy (XAFS), was employed. The study provided the benchmark information for designing and tailoring the formation of nanostructures towards the potential properties and applications. The materials are based upon the research work done at National Synchrotron Light Source and Advanced Photon Sources. The presenter acknowledges the supports by the grants from U.S. Department of Energy and National Institutes of Health.

March 5Synthesis and Characterization of M(CO)(*CN) and M(RS2)x Complexes to Mimic Hydrogenase
Dan Amarante, Stony Brook University
Flyer

Currently, the energy infrastructure is dominated by fossil fuel production and combustion. This is causing massive emission of greenhouse gases which are harming the planet. Hydrogen is often suggested as alternative fuel, sometimes called as the fuel of the future. This statement has been mentioned for at least a generation, usually with greater seriousness during high petroleum prices. The technology to utilized hydrogen is highly advanced, however it is the scaling up that remains an issue. Hydrogen fuel cells have been designed and used, but because of the high cost and limited availability of platinum group metals this technology has not widespread to the retail market. Scientists have turned to biological systems that utilized hydrogen in order to develop new catalysts that do not require platinum group metals. In nature, hydrogen is consumed/produced with certain efficiency by hydrogenase enzymes.

These enzymes are characterized as metalloenzymes which contain iron and/or nickel core. The discovery of [Fe(CN)x(CO) y] units in hydrogenase enzymes has prompted the study of iron-cyanide-carbonyl compounds. Recently, compounds of the general structure [FeII/III(CN)4L2]-2/-3, where L= DMSO, CO, pyridine, were synthesized for the first time. This prompted studies of related compounds of the congener elements of iron, specifically using ruthenium and osmium. These studies have produced the first compounds of ruthenium with the general structure, [RuII(CN)4L2]2- where L = CO and pyridine. Iron carbonyl complexes with the H2PS2 ligand have been previously used to mimic the iron centers in hydrogenase enzymes. To expand on these studies, ruthenium was used to replace iron in the general structure [MII(CO)3(PS2)]. Various compounds were also synthesized using Li2NS2 in place of Li2PS2.

April 2Design and Total Synthesis of Self-healing Cyanine Fluorophores
work performed at Weill Medical College of Cornell University
Zhou Zhou, Queensborough Community College
Flyer

Small organic fluorophores are powerful research tools in biological imaging that have enabled unprecedented insights into mechanisms of bio-functions. Fluorescence applications as Single-molecule fluorescence resonance energy transfer (smFRET) requires high photo-stability and brightness of fluorophores. A series of cyanine dye molecules have been synthesized with significantly enhanced brightness, lifespan and water solubility by covalently attaching triplet state quenchers (TSQ) to the fluorophores along with other structural modifications. The advanced physical properties of these new fluorophores have already led to several previously impossible research projects, and shed light on both cellular and molecular processes masked by ensemble averaging in bulk investigations.


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