H. V. Rasika Dias
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The University of Texas at Arlington | ||||||||||||
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H. V. Rasika Dias |
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| Inorganic & Organometallic Chemistry |
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| Education: B.Sc. (First Class Honors) Ph.D. University of California, Davis (1988) Postdoctoral Fellow: Visiting Research Scientist: |
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| Honors and
Awards:
• The University of Texas at Arlington Award for
Outstanding Research Achievement, 2007 Other affiliations: Visiting Professor, Institute of Fundamental Studies, Sri Lanka Research interests: (i) homogeneous catalysis, (ii) luminescent materials, (iii) conducting polymers, (iv) bioinorganic chemistry, and (v) the development of new ligands for metal coordination chemistry.
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| Properties of metal
complexes are directly related to the type of ligands on the metal center.
Thus, a major part of our research efforts are directed to the design and
synthesis of novel ligands with varying degree of steric and electronic
properties. Recent studies led to the isolation of several interesting
ligands with high fluorine content. These
“Teflon coated” molecular containers allow us to
study chemistry, rarely seen with any other ligand system. For example, we
have been able to isolate reactive intermediates
in “bottle-able” form using these highly fluorinated ligands.
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We have been able to prepare metal catalysts that are capable of activating some of the most inert bonds like C-H and C-Cl under remarkably mild conditions. The development of greener, catalytic routes to prepare conducting polymeric materials is also of interest. Some metal complexes used in these studies serve as good models for metalloenzymes. |
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We are developing luminescent materials for “metal-organic” light-emitting device (MOLED) and sensor applications. Most of these materials involve late transition metal ions and nitrogen based heterocyclic ligands. Recent studies in this area led to the isolation of brightly luminescent copper, silver, and gold compounds. The solutions of these compounds are also luminescent, and the colors depend on the nature of the solvent. It is also possible to prepare light emitting, nano-scale material with large cavities or channels and chain structures.
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Low valent and low coordinate main group species show interesting structures, bonding, and properties. We have reported the synthesis of first "stable" multidentate carbene ligand. We are currently developing various strategies to isolate carbene analogs of group 13 and 14 elements. Many of these species are valuable ligands for developing homogeneous catalysts and as building blocks for luminescent materials. |
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Modern synthetic and analytical techniques like Schlenk and glove box methods, multinuclear NMR spectroscopy, and X-ray crystallography are used routinely in our work. |
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Recent Publications: “A mild, copper catalyzed
route to conducting polyaniline”, H. V. R. Dias,
X. Wang, R. M. G. Rajapakse, R. L. Elsenbaumer, Chem. Commun., 2006,
976-978. Highlighted
in C&E
News, March 6, 2006, "Copper catalyst
paves new way to polyaniline" in Science & Technology Concentrates,
page 62. “Mixed-Conducting
Polyaniline-Fuller’s Earth Nano Composites Prepared by Stepwise
Intercalation”, D. M. M. Krishantha, R. M. G. Rajapakse, D. T. B.
Tennakoon, H. V. R. Dias, Electrochim. Acta, 2006, 51,
2483-2490. “Polypyrrole-Montmorillonite
Nanocomposite: A Composite Fast Ion Conductor”, D. M. M. Krishantha, R. M. G. Rajapakse, D. T. B.
Tennakoon, H. V. R. Dias, J. Composite Mater., 2006, 40,
1009-1021. “Trimeric silver(I)
pyrazolates with isopropyl, bromo and nitro substituents: Synthesis and
characterization of {[3,5-(i-Pr)2Pz]Ag}3,
{[3,5-(i-Pr)2,4-(Br)Pz]Ag}3, and {[3,5-(i-Pr)2,4-(NO2)Pz]Ag}3”,
H. V. R. Dias, H. V. K. Diyabalanage, Polyhedron, 2006, 25,
1655-1661. “Antimicrobial Properties of
Highly Fluorinated Silver(I) Tris(pyrazolyl)borates”, H. V. R. Dias, K. H.
Batdorf, M. Fianchini, H. V. K. Diyabalanage,
S. Carnahan, R. Mulcahy, A. Rabiee, K. Nelson, L. G. van Waasbergen, Inorg.
Biochem., 2006, 100, 158-160. “Intertrimer and Intratrimer
Metallophilic and Excimeric Bonding in the Ground and Phosphorescent States
of Trinuclear Coinage Metal Pyrazolates: A Computational Study”, T.
Grimes, M. A. Omary, H. V. R. Dias, T. R. Cundari, J. Phys. Chem. A, 2006,
110, 5823-5830. “Greener Method for High
Quality Polypyrrole”, H. V. R. Dias, M. Fianchini, R. M. G. Rajapakse,
Polymer, 2006, 47, 7349-7354. “Monomeric lithium triazapentadienyl complexes”, H. V. R.
Dias, S. Singh, Dalton Trans., 2006,1995-2000. “Syntheses of Highly
Fluorinated 1,3,5-Triazapentadienyl ligands and their Use in the Isolation
of Copper(I)-Carbonyl and Copper(I)-Ethylene Complexes”, H. V. R. Dias, S. Singh, J. A.
Flores, Inorg. Chem., 2006, 45, 8859-8861. “AC impedance
analysis of polyaniline–montmorillonite nanocomposites”, D. M. M.
Krishantha, R. M. G. Rajapakse, D. T. B. Tennakoon, H. V. R. Dias, Ionics,
2006, 12, 287-294. H. V. Rasika Dias, “Silver,
[tris[3,5-bis(trifluoromethyl)-1H-pyrazolato-κN1]hydroborato(1-)-κN2,
κN2′, κN2″]–, 2006,
Encyclopedia of Reagents for Organic Synthesis [Online], John Wiley &
Sons Ltd., www.mrw.interscience.wiley.com/eros/;
DOI:
10.1002/047084289X.rn00663. “Silver-Catalyzed
[2,3]-Rearrangement of Halonium Ylides Derived from Allyl and Propargyl
Halides and Alkyl Diazoacetates”, P.
Krishnamoorthy, R. G. Browning, S. Singh, R. Sivappa, C. J. Lovely, H. V. R.
Dias, Chem. Commun., 2007, 731-733. “Trinuclear Silver(I)
Complexes of Fluorinated Pyrazolates”, H. V. R. Dias, C. S. Palehepitiya
Gamage, J. Keltner, H. V. K. Diyabalanage, I. Omari, Y. Eyobo, N. R. Dias,
N. Roehr, L. McKinney, T. Poth, Inorg. Chem, 2007,
46, 2979-2987. “A “Classical” Silver Carbonyl Complex [MeB(3-(Mes)Pz)3]AgCO and the Related Silver Ethylene Adduct [MeB(3-(Mes)Pz)3]Ag(C2H4)”,
H. V. R. Dias, M. Fianchini, Angew. Chem., 2007, 119,
2238-2241, Angew. Chem. Int.
Ed., 2007, 46, 2188-2191. Highlighted
in the frontispiece. “Eco-Friendly synthesis of
high quality polyaniline using a copper(II) scorpionate catalysts”, H. V.
R. Dias, R. M. G. Rajapakse, D. M. M. Krishantha, M. Fianchini, X. Wang, R.
L. Elsenbaumer, J. Mater. Chem., 2007,
17, 1762-1768. Identified
as a “Hot-Paper”: http://www.rsc.org/Publishing/Journals/jm/News/HotADias.asp “Arene Sandwiched Silver(I)
Pyrazolates”, H. V. R. Dias, C. S. Palehepitiya Gamage, Angew. Chem., 2007,
119, 2242-2244, Angew.
Chem. Int. Ed., 2007, 46, 2192-2194. “Structural variations of
silver ethylene complexes supported by boron-protected fluorinated
scorpionates and the isolation of a ligand directed silver helix”, H.
V. R. Dias, J. Wu, X. Wang, K. Rangan, Inorg. Chem., 2007, 46,
1960-1962. “Antimicrobial Properties of
Highly Fluorinated Tris(pyrazolyl)borates”, L.
G. van Waasbergen, I. Fajdectic, M. Fianchini, H. V. R. Dias, Inorg.
Biochem., 2007, 101,
1180-1183. “Fluorinated
Tris(pyrazolyl)borates and Silver(I) Complexes of Group 14 Ligands”, H. V.
R. Dias, M. Fianchini, Comments Inorg. Chem., 2007,
28, 73-92. “Thermally Stable Gold(I)
b-Diketiminate Complexes”, H. V. R. Dias, J. A. Flores, Inorg. Chem.,
2007, 46, 5841-5843.
"Boron-Phosphorus Analogues of
Benzene and Cyclobutadiene. Synthesis and Characterization of the
Boraphosphabenzenes (RBPR')3 (R = Mes, Ph; R' = Ph, Mes, C6H11,
t-Bu) and the Diphosphadiboretane (ThexylBPMes)2"; H.
V. R. Dias, P. P. Power, J. Am. Chem. Soc. 1989, 111,
144-148. "Electronic Stabilization of
Nucleophilic Carbenes"; A. J. Arduengo, III, H. V. R. Dias, R. L.
Harlow, M. Kline, J. Am. Chem. Soc. 1992, 114,
5530-5534. "A Stable Carbene-Alane
Adduct"; A. J. Arduengo, III, H. V. R. Dias, J. C. Calabrese, F.
Davidson, J. Am. Chem. Soc. 1992, 114, 9724-9725; Highlighted
in C&E News, December 14, 1992, "Stable
Carbene-Alane Adduct Prepared" in Science & Technology
Concentrates, page 22. "A Stable Tridentate Carbene
Ligand"; H. V. R. Dias, W. Jin, Tetrahedron Lett. 1994,
35, 1365-1366. This discovery has been now recognized as a World
record in chemistry. See Page 258, “World Records in
Chemistry”, Editor H.-J. Quadbeck-Seeger; Wiley, 1999, ISBN 3-527-29574-7 "Aminotroponiminato Complexes of
Silicon, Germanium, Tin, and Lead", H. V. R. Dias, Z. Wang, W. Jin,
Coord. Chem. Rev., 1998, 176, 67-86. "Activation of Alkyl Halides via a
Silver-Catalyzed Carbene Insertion Process ", H. V. R. Dias, R. G.
Browning, S. A. Polach, H. V. K. Diyabalanage, C. J. Lovely, J. Am. Chem.
Soc., 2003, 125, 9270-9271. "Bright Phosphorescence of a
Trinuclear Copper (I) Complex: Luminescence Thermochromism, Solvatochromism,
and “Concentration Luminochromism”, H. V. R. Dias, H. V. K.
Diyabalanage, M. A. Rawashdeh-Omary, M. A. Franzman, M. A. Omary,
J. Am. Chem. Soc., 2003, 125, 12072-12073. This
discovery has been recognized as a ACS “Heart-Cut”
item in the November 17, 2003 issue. "Indium and Thallium", H. V.
R. Dias, Comprehensive Coordination Chemistry II. 2004, 3, 383-463. "Metal Effect on the Supramolecular Structure, Photophysics, and Acid-Base Character of Trinuclear Pyrazolato Coinage Metal Complexes”, M. A. Omary, M. A. Rawashdeh-Omary, M. A. W. Gonser, O. Elbjeirami, T. Grimes, T. R. Cundari, H. V. K. Diyabalanage, C. S. Palehepitiya Gamage, and H. V. R. Dias, Inorg. Chem., 2005, 44, 8200-8210. Highlighted in the Inorganic Chemistry Cover, Nov 14 issue, 2005. |
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