A5049532515- Fullerene Chemistry and Applications
- Graphene research and applications
- Boron and Carbon Nanomaterials Research
- Diamond and Carbon-based Materials Research
- Carbon Nanotubes in Composites
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Molecular Junctions and Nanostructures
- Advanced Chemical Physics Studies
- Crystallography and molecular interactions
- Nanotechnology research and applications
- Synthesis and Properties of Aromatic Compounds
- Polymer Nanocomposite Synthesis and Irradiation
- Advanced Materials Characterization Techniques
- Advanced Physical and Chemical Molecular Interactions
- Semiconductor materials and devices
- Extraction and Separation Processes
- Material Properties and Applications
- Muon and positron interactions and applications
- NMR spectroscopy and applications
- Analytical Chemistry and Chromatography
- Nonlinear Optical Materials Studies
- Polymer Nanocomposites and Properties
- Inorganic Chemistry and Materials
- Inorganic and Organometallic Chemistry
Purdue University Fort Wayne
2018-2025
Indiana University – Purdue University Fort Wayne
2012-2024
Purdue University West Lafayette
2012-2023
University of California, Davis
2000-2015
FWRadiology
2014
University of Southern Mississippi
2004-2011
Bruker (United States)
2008-2010
Universitat Rovira i Virgili
2010
Virginia Tech
1997-2009
Colorado State University
2007-2009
The remarkably large cluster Sc4(mu3-O)2 has been obtained trapped inside an Ih-C80 cage by conducting the vaporization of graphite rods doped with copper(II) nitrate and scandium(III) oxide in electric arc under a low pressure helium atmosphere added flow air. product isolated chromatography identified high-resolution mass spectrometry. structure Sc4(mu3-O)2@Ih-C80 determined X-ray crystallography on crystal Sc4(mu3-O)2@Ih-C80.NiII(OEP).2(C6H6). unit consists distorted tetrahedron scandium...
Shortly after the discovery of carbon fullerene allotrope, C60, researchers recognized that hollow spheroidal shape could accommodate metal atoms, or clusters, which quickly led to endohedral metallofullerenes (EMFs). In past 2 decades, unique features EMFs have attracted broad interest in many fields, including inorganic chemistry, organic materials and biomedical chemistry. Some produce new metallic clusters do not exist outside a cage, some other can boost efficiency magnetic resonance...
Single-crystal X-ray diffraction studies of Sc(2)(μ(2)-S)@C(s)(6)-C(82)·Ni(II)(OEP)·2C(6)H(6) and Sc(2)(μ(2)-S)@C(3v)(8)-C(82)·Ni(II)(OEP)·2C(6)H(6) reveal that both contain fully ordered fullerene cages. The crystallographic data for show two remarkable features: the presence slightly different cage sites a molecule Sc(2)(μ(2)-S)@C(s)(6)-C(82) in one these sites. Sc-S-Sc angles (113.84(3)°) Sc(2)(μ(2)-S)@C(3v)(8)-C(82) differ (97.34(13)°). This is first case where nature structure isomer...
IMPORTANCE Supplementing potassium in an effort to maintain high-normal serum concentrations is a widespread strategy used prevent atrial fibrillation after cardiac surgery (AFACS), but not evidence-based, carries risks, and costly. OBJECTIVE To determine whether lower concentration trigger for supplementation noninferior trigger. DESIGN, SETTING, AND PARTICIPANTS This open-label, noninferiority, randomized clinical trial was conducted at 23 surgical centers the United Kingdom Germany....
The ErnSc3-nN@C80 (n = 0−3) family of four endohedral fullerenes has been prepared by vaporization graphite rods packed with 2% Sc2O3/3% Er2O3/95% powder in a Krätschmer−Huffman fullerene generator under dynamic flow helium and dinitrogen. ErSc2N@C80 isolated pure form via three stages high-pressure liquid chromatography characterized mass spectrometry. first structure mixed metal endohedral, ErSc2N@C80, determined single-crystal X-ray diffraction at 90 K on...
The X-ray crystal structure of Gd3N@C80•NiII(OEP)•1.5(benzene) shows that the Gd3N unit within Ih C80 cage is pyramidal, whereas Sc3N@C80, Sc3N@C78, Sc3N@C68, Lu3N@C80 and Sc2ErN@C80 have planar M3N units.
The tetrahedral array of four scandium atoms with oxygen capping three the faces found in Sc(4)(mu(3)-O)(3)@I(h)-C(80) is largest cluster isolated to date inside a fullerene cage.
The new endohedral fullerene, Sc(2)(mu(2)-O)@C(s)(6)-C(82), has been isolated from the carbon soot obtained by electric arc generation of fullerenes utilizing graphite rods doped with 90% Sc(2)O(3) and 10% Cu (w/w). Sc(2)(mu(2)-O)@C(s)(6)-C(82) characterized single crystal X-ray diffraction, mass spectrometry, UV/vis spectroscopy. Computational studies have shown that, among nine isomers that follow pentagon rule (IPR) for C(82), cage 6 C(s) symmetry is most favorable to encapsulate cluster...
The trimetallic nitride template (TNT) approach has been successfully utilized to prepare the new endohedral Lu(3)N@C(80). Well-ordered crystals of Lu(3)N@C(80).5 (o-xylene) and Sc(3)N@C(80).5 form upon cooling o-xylene solutions these endohedrals they are isomorphous. Although positions fullerene cage (which is fully ordered located at a crystallographic center symmetry) molecules nearly identical in two structures, positioning metal ions differ significant ways. However, expected...
The structure of one the three previously separated isomers {Er2@C82} has been determined through a single-crystal X-ray determination noncovalent adduct, {Er2@C82 Isomer I}·{CoII(OEP)}·1.4(C6H6)·0.3(CHCl3). C82 cage is identified specificlly as Cs(82:6) isomer (one nine possible isolated pentagon isomers) from crystallographic data. carbon atoms were individually and refined with only constraint that required two halves to possess similar bond lengths. Although well ordered at 113 K, erbium...
Structural characterizations of three new mixed-metal endohedrals, GdSc 2N@ I h -C80, Gd 2ScN@ and TbSc 2@ have been obtained by single-crystal X-ray diffraction on -C80 x Ni (II)(OEP) 2C 6H 6, -C 80 Ni(II)(OEP) 2C6H6, 2C6H6. All cages planar MM' 2N units. The central nitride ion is positioned further from the larger Gd3+ or Tb3+ ions closer to smaller Sc3+ ions. units show a remarkable degree orientational order in these related compounds which endohedral fullerene cocrystallized with...
Separation difficulties have led to a paucity of purified metallic nitride fullerenes (MNFs). Fundamental research and application development has been hampered with limited sample availability. techniques designed remove contaminant empty-cage (e.g., C60, C70...C2n) classical metallofullerenes non-MNFs) traditionally require expensive tedious chromatographic methods. Our motivation is an alternative purification approach minimize dependence on HPLC. Herein we report the use cyclopentadienyl...
The addition of CF3 radicals to both the Ih and D5h cage-isomers Sc3N@C80 by high-temperature reaction metallic nitride fullerenes with gaseous CF3I has resulted in isolation Sc3N@(C80-Ih)(CF3)2 Sc3N@(C80-D5h)(CF3)2, which have idealized C2 Cs symmetry, respectively. Both new compounds were characterized 19F NMR electronic absorption spectroscopy, mass spectrometry, quantum-chemical calculations at DFT level theory, cage derivative was also cyclic voltammetry. results indicate that a...
A family of highly stable (poly)perfluoroalky-lated metallic nitride cluster fullerenes was prepared in high-temperature reactions and characterized by spectroscopic (MS, 19F NMR, UV−vis/NIR, ESR), structural electrochemical methods. For two new compounds, Sc3N@C80(CF3)10 Sc3N@C80(CF3)12, single crystal X-ray structures are determined. Addition pattern guidelines for endohedral fullerene derivatives with bulky functional groups formulated as a result experimental (19F NMR spectroscopy...
The clusterfullerene Sc(4)O(2)@C(80) with a mixed redox state of scandium was found to be an exciting molecule for endohedral electrochemistry as demonstrated by means in situ electron spin resonance (ESR) spectroelectrochemical study the density distribution its electrochemically generated cation and anion radicals. compound exhibits two reversible reduction oxidation steps relatively small electrochemical gap 1.10 V. ESR spectra ion radicals have rich hyperfine structure caused pairs...
We report a chemical separation method to isolate fullertubes: new and soluble allotrope of carbon whose structure merges nanotube, graphene, fullerene subunits. Fullertubes possess single-walled nanotube belts resembling rolled graphene midsection, but with half-fullerene end-caps. Unlike nanotubes, fullertubes are reproducible in structure, defined molecular weight, pristine form. The high reactivity amines spheroidal cages enables their removal allows facile isolation C96-D3d(3),...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAutomated HPLC Separation of Endohedral Metallofullerene Sc@C2n and Y@C2n FractionsS. Stevenson, H. C. Dorn, P. Burbank, K. Harich, J. Haynes, Kiang, R. Salem, M. S. DeVries, van Loosdrecht, . et al.Cite this: Anal. Chem. 1994, 66, 17, 2675–2679Publication Date (Print):September 1, 1994Publication History Published online1 May 2002Published inissue 1 September...
Since the experimental observation of encapsulation different species inside fullerene (endohedral fullerenes) cages, several research groups have focused their in elaboration new and novel compounds. Exohedral functionalization carbon cages has helped discovery expanded potential applications material science medicine. Our group contributed to discovery, functionalization, characterization interesting compounds that been explored applications, but mainly field organic photovoltaics. Here,...
Lanthanide–lanthanide bonds are exceptionally rare, and dimetallofullerenes provide a unique possibility to stabilize study these unusual bonding patterns. The presence of metal–metal consequences thereof for the electronic properties M2@C82 (M = Sc, Er, Lu) addressed by electrochemistry, electron paramagnetic resonance, SQUID magnetometry other spectroscopic techniques. A simplified non-chromatographic separation procedure is developed isolation Er2@C82 (Cs(6) C3v(8) cage isomers) Sc2@C82...
Metallic nitride fullerenes (MNFs) and oxometallic (OMFs) react quickly with an array of Lewis acids. Empty-cage are largely unreactive under conditions used in this study. The reactivity order is Sc(4)O(2)@I(h)-C(80) > Sc(3)N@C(78) Sc(3)N@C(68) Sc(3)N@D(5h)-C(80) Sc(3)N@I(h)-C(80). Manipulations acids, molar ratios, kinetic differences within the family OMF MNF metallofullerenes demonstrated a selective precipitation scheme, which can be either alone for purifying Sc(3)N@I(h)-C(80) or...