A5078697351- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Organic Light-Emitting Diodes Research
- Luminescence and Fluorescent Materials
- Organic Electronics and Photovoltaics
- Catalytic Cross-Coupling Reactions
- Organometallic Complex Synthesis and Catalysis
- Conducting polymers and applications
- Lanthanide and Transition Metal Complexes
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Crystallography and molecular interactions
- Metal complexes synthesis and properties
- Porphyrin and Phthalocyanine Chemistry
- Perovskite Materials and Applications
- Magnetism in coordination complexes
- Molecular Junctions and Nanostructures
- Photochemistry and Electron Transfer Studies
- Radical Photochemical Reactions
- Boron Compounds in Chemistry
- Nanocluster Synthesis and Applications
- Organic and Molecular Conductors Research
- Solid-state spectroscopy and crystallography
- Synthesis and Properties of Aromatic Compounds
- 2D Materials and Applications
- Catalytic C–H Functionalization Methods
University of Southern California
2016-2025
Southern California University for Professional Studies
2009-2025
Los Angeles City College
2015-2020
University of California, Berkeley
2013
Iowa State University
2010
California Institute of Technology
2005-2009
University of California, Los Angeles
2008
Lund University
2007
University of Illinois Urbana-Champaign
2007
Princeton University
2001-2004
The synthesis and photophysical study of a family cyclometalated iridium(III) complexes are reported. iridium have two (C(**)N) ligands single monoanionic, bidentate ancillary ligand (LX), i.e., C(**)N2Ir(LX). C(**)N can be any wide variety organometallic ligands. LX used for this were all beta-diketonates, with the major emphasis placed on acetylacetonate (acac) complexes. majority C(**)N2Ir(acac) phosphoresce high quantum efficiencies (solution yields, 0.1-0.6), microsecond lifetimes...
The synthesis, electrochemistry, and photophysics of a series square planar Pt(II) complexes are reported. have the general structure C(wedge)NPt(O(wedge)O),where C(wedge)N is monoanionic cyclometalating ligand (e.g., 2-phenylpyridyl, 2-(2'-thienyl)pyridyl, 2-(4,6-difluorophenyl)pyridyl, etc.) O(wedge)O beta-diketonato ligand. Reaction K(2)PtCl(4) with HC(wedge)N precursor forms chloride-bridged dimer, C(wedge)NPt(mu-Cl)(2)PtC(wedge)N, which cleaved beta-diketones such as acetyl acetone...
The synthesis, structures, electrochemistry, and photophysics of a series facial (fac) meridional (mer) tris-cyclometalated Ir(III) complexes are reported. have the general formula Ir(C∧N)3 [where C∧N is monoanionic cyclometalating ligand; 2-phenylpyridyl (ppy), 2-(p-tolyl)pyridyl (tpy), 2-(4,6-difluorophenyl)pyridyl (46dfppy), 1-phenylpyrazolyl (ppz), 1-(4,6-difluorophenyl)pyrazolyl (46dfppz), or 1-(4-trifluoromethylphenyl)pyrazolyl (tfmppz)]. Reaction dichloro-bridged dimers...
The preparation, photophysics, and solid state structures of octahedral organometallic Ir complexes with several different cyclometalated ligands are reported. IrCl3·nH2O cleanly cyclometalates a number compounds (i.e., 2-phenylpyridine, 2-(p-tolyl)pyridine, benzoquinoline, 2-phenylbenzothiazole, 2-(1-naphthyl)benzothiazole, 2-phenylquinoline), forming the corresponding chloride-bridged dimers, C∧N2Ir(μ-Cl)2IrC∧N2 (C∧Nis ligand) in good yield. These dimers react acetyl acetone (acacH) other...
Intermolecular energy transfer processes typically involve an exothermic of from a donor site to molecule with substantially lower-energy excited state (trap). Here, we demonstrate that endothermic molecular organic host (donor) organometallic phosphor (trap) can lead highly efficient blue electroluminescence. This demonstration employs iridium(III)bis(4,6-di-fluorophenyl)-pyridinato-N,C2′)picolinate as the phosphor. Due comparable triplet relative 4,4′-N,N′-dicarbazole-biphenyl conductive...
The synthesis and photophysical characterization of a series (N,C(2')-(2-para-tolylpyridyl))2 Ir(LL') [(tpy)2 Ir(LL')] (LL' = 2,4-pentanedionato (acac), bis(pyrazolyl)borate ligands their analogues, diphosphine chelates tert-butylisocyanide (CN-t-Bu)) are reported. A smaller [(dfppy)2 (dfppy N,C(2')-2-(4',6'-difluorophenyl)pyridyl) complexes were also examined along with two previously reported compounds, (ppy)2 Ir(CN)2- Ir(NCS)2- (ppy N,C(2')-2-phenylpyridyl). (tpy)2 Ir(PPh2CH2)2 BPh2...
Two approaches are reported to achieve efficient blue near-UV emission from triscyclometalated iridium(III) materials related the previously complex, fac-Ir(ppz)3 (ppz = 1-phenylpyrazolyl-N,C2'). The first involves replacement of phenyl group ppz ligand with a 9,9-dimethyl-2-fluorenyl group, i.e., fac-tris(1-[(9,9-dimethyl-2-fluorenyl)]pyrazolyl-N,C2')iridium(III), abbreviated as fac-Ir(flz)3. Crystallographic analysis reveals that both fac-Ir(flz)3 and have similar coordination environment...
The photophysical properties for a series of facial (fac) cyclometalated Ir(III) complexes (fac-Ir(C--N)(3) (C--N = 2-phenylpyridyl (ppy), 2-(4,6-difluorophenyl)pyridyl (F2ppy), 1-phenylpyrazolyl (ppz), 1-(2,4-difluorophenyl)pyrazolyl) (F2ppz), and 1-(2-(9,9'-dimethylfluorenyl))pyrazolyl (flz)), fac-Ir(C--N)(2)(C--N') ppz or F2ppz C--N' ppy F2ppy), fac-Ir(C--C')(3) (C--C' 1-phenyl-3-methylbenzimidazolyl (pmb)) have been studied in dilute 2-methyltetrahydrofuran (2-MeTHF) solution temperature...
A series of cationic Ir(III) complexes with the general formula (C∧N)2Ir(N∧N)+PF6- featuring bis-cyclometalated 1-phenylpyrazolyl-N,C2' (C∧N) and neutral diimine (N∧N, e.g., 2,2'-bipyridyl) ligands were synthesized their electrochemical, photophysical, electroluminescent properties studied. Density functional theory calculations indicate that highest occupied molecular orbital compounds is comprised a mixture Ir d phenylpyrazolyl-based orbitals, while lowest unoccupied has predominantly...
Helping copper glow Copper's abundance makes the metal an appealing candidate for luminescence applications. However, many complexes tend to decay nonradiatively after photoexcitation. A recently described exception involves a two-coordinate complex that sandwiches between amide ligand and carbene ligand. Hamze et al. thoroughly explored this motif measured nearly perfect efficiency. They used property produce prototype blue organic light-emitting diode. The photodynamics appeared largely...
Single crystalline zero-dimensional organic metal halide hybrids have been developed.
Efficient white electrophosphorescence has been achieved with a single emissive dopant. The dopant in these organic light emitting diodes (WOLEDs) emits simultaneously from monomer and aggregate states, leading to broad spectrum high quality emission. molecules are based on series of platinum(II) [2-(4,6-difluorophenyl)pyridinato-N,C2′] β-diketonates. All the complexes described herein have identical photophysics dilute solution structured blue emission (λmax = 468, 500, 540 nm). A orange ≈...
Four ultrahigh energy gap organosilicon compounds [diphenyldi(o-tolyl)silane (UGH1), p-bis(triphenylsilyl)benzene (UGH2), m-bis(triphenylsilyl)benzene (UGH3), and 9,9'-spirobisilaanthracene (UGH4)] were employed as host materials in the emissive layer of electrophosphorescent organic light-emitting diodes (OLEDs). The high singlet (∼4.5 eV) triplet (∼3.5 energies associated with these effectively suppress both electron transfer quenching pathways between dopant material, leading to deep blue...
Photophysical properties of two highly emissive three-coordinate Cu(I) complexes, (IPr)Cu(py2-BMe2) (1) and (Bzl-3,5Me)Cu(py2-BMe2) (2), with different N-heterocyclic (NHC) ligands were investigated in detail (IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene; Bzl-3,5Me 1,3-bis(3,5-dimethylphenyl)-1H-benzo[d]imidazol-2-ylidene; py2-BMe2 di(2-pyridyl)dimethylborate). The compounds exhibit remarkably high emission quantum yields more than 70% the powder phase. Despite similar chemical...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new synthetic route to the preparation of a series strong photoreducing agents: fac-tris-ortho-metalated complexes iridium(III) with substituted 2-phenylpyridinesK. Dedeian, P. I. Djurovich, F. O. Garces, G. Carlson, and R. J. WattsCite this: Inorg. Chem. 1991, 30, 8, 1685–1687Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Published inissue 1 April...
A series of six luminescent two-coordinate Cu(I) complexes were investigated bearing nonconventional N-heterocyclic carbene ligands, monoamido-aminocarbene (MAC*) and diamidocarbene (DAC*), along with carbazolyl (Cz) as well mono- dicyano-substituted Cz derivatives. The emission color can be systematically varied over 270 nm, from violet to red, through proper choice the acceptor (carbene) donor (carbazolyl) groups. compounds exhibit photoluminescent quantum efficiencies up 100% in fluid...
The synthesis and characterization is reported of (C9 NH20 )2 SnBr4 , a novel organic metal halide hybrid with zero-dimensional (0D) structure, in which individual seesaw-shaped tin (II) bromide anions (SnBr42- ) are co-crystallized 1-butyl-1-methylpyrrolidinium cations NH20+ ). Upon photoexcitation, the bulk crystals exhibit highly efficient broadband deep-red emission peaked at 695 nm, large Stokes shift 332 nm high quantum efficiency around 46 %. unique photophysical properties this...
We demonstrate a new approach for utilizing CuI coordination complexes as emissive layers in organic light-emitting diodes that involves situ codeposition of and 3,5-bis(carbazol-9-yl)pyridine (mCPy). With simple three-layer device structure, pure green electroluminescence at 530 nm from Cu(I) complex was observed. A maximum luminance external quantum efficiency (EQE) 9700 cd/m2 4.4%, respectively, were achieved. The luminescent species identified [CuI(mCPy)2]2 on the basis photophysical...
A systematic study is presented on the physical and photophysical properties of isoelectronic isostructural Cu, Ag, Au complexes with a common amide (N-carbazolyl) two different carbene ligands (i.e., CAAC = (5 R,6 S)-2-(2,6-diisopropylphenyl)-6-isopropyl-3,3,9-trimethyl-2-azaspiro[4.5]decan-2-ylidene, MAC 1,3-bis(2,6-diisopropylphenyl)-5,5-dimethyl-4-keto-tetrahydropyridylidene). The crystal structures (carbene)M(I)(N-carbazolyl) (MCAAC) (MAC)M(I)(N-carbazolyl) (MMAC) show coplanar carbzole...
We report the synthesis and characterization of (Ph4P)2SbCl5, a novel ionically bonded organic metal halide hybrid with zero-dimensional (0D) structure at molecular level. By cocrystallization tetraphenylphosphonium (Ph4P+) antimony (Sb3+) chloride salts, (Ph4P)2SbCl5 bulk single crystals can be prepared in high yield, which exhibit highly efficient broadband red emission peaked 648 nm photoluminescence quantum efficiency (PLQE) around 87%. Density functional theory (DFT) calculations reveal...
The rich chemistry of organic–inorganic metal halide hybrids has enabled the development a variety crystalline structures with controlled morphological and molecular dimensionalities. Here we report for first time single assembly clusters, (C9NH20)7(PbCl4)Pb3Cl11, in which lead chloride tetrahedrons (PbCl42–) face-sharing trimer clusters (Pb3Cl115–) cocrystallize organic cations (C9NH20+) to form periodical zero-dimensional (0D) structure at level. Blue light emission peaked 470 nm...