1
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Oyama H, Nishimura Y. Substituent effects of halogens on the excited-state intermolecular proton transfer reactions. Photochem Photobiol Sci 2024; 23:1341-1352. [PMID: 38850493 DOI: 10.1007/s43630-024-00598-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Accepted: 05/27/2024] [Indexed: 06/10/2024]
Abstract
Fluorescent aromatic urea compounds undergo excited-state intermolecular proton transfer (ESPT) in the presence of acetate anions to produce an excited state of the tautomer (T*) from the excited state of the complex (N*), resulting in dual fluorescence. Herein, we performed spectroscopic measurements of anthracen-1-yl-3-phenylurea derivatives with substituents, -CF3, -F, or -Cl, at the p-position of the phenyl group in the presence of acetate to investigate the substituent effects on the ESPT reaction and the deactivation processes of N* and T*. Kinetic analysis showed that the reverse ESPT rate constant (k-PT) depended on the respective substituents, suggesting that each substituent may influence the reverse ESPT process differently. In particular, since the electron-withdrawing properties of -F are estimated by the - I and + Iπ effects, it is plausible that -F has a slight electron-donating property and influences the reverse process from T* to N* in the excited state. This study shows that it is possible to control emission by selecting specific substituents in the ESPT system.
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Affiliation(s)
- Hiroki Oyama
- Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki, 305-8571, Japan
| | - Yoshinobu Nishimura
- Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki, 305-8571, Japan.
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2
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Volpi G, Laurenti E, Rabezzana R. Imidazopyridine Family: Versatile and Promising Heterocyclic Skeletons for Different Applications. Molecules 2024; 29:2668. [PMID: 38893542 PMCID: PMC11173518 DOI: 10.3390/molecules29112668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2024] [Revised: 05/30/2024] [Accepted: 05/31/2024] [Indexed: 06/21/2024] Open
Abstract
In recent years, there has been increasing attention focused on various products belonging to the imidazopyridine family; this class of heterocyclic compounds shows unique chemical structure, versatile optical properties, and diverse biological attributes. The broad family of imidazopyridines encompasses different heterocycles, each with its own specific properties and distinct characteristics, making all of them promising for various application fields. In general, this useful category of aromatic heterocycles holds significant promise across various research domains, spanning from material science to pharmaceuticals. The various cores belonging to the imidazopyridine family exhibit unique properties, such as serving as emitters in imaging, ligands for transition metals, showing reversible electrochemical properties, and demonstrating biological activity. Recently, numerous noteworthy advancements have emerged in different technological fields, including optoelectronic devices, sensors, energy conversion, medical applications, and shining emitters for imaging and microscopy. This review intends to provide a state-of-the-art overview of this framework from 1955 to the present day, unveiling different aspects of various applications. This extensive literature survey may guide chemists and researchers in the quest for novel imidazopyridine compounds with enhanced properties and efficiency in different uses.
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Affiliation(s)
- Giorgio Volpi
- Department of Chemistry, University of Turin, Via Pietro Giuria 7, 10125 Torino, Italy; (E.L.)
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3
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Jayabharathi J, Thanikachalam V, Thilagavathy S. Phosphorescent organic light-emitting devices: Iridium based emitter materials – An overview. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2023.215100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
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4
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Blue Emissive Palladium(II) Complex with Benzoquinoline and N-heterocyclic Carbene Ligands. J Organomet Chem 2023. [DOI: 10.1016/j.jorganchem.2023.122669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
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5
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Edkins RM, Hsu YT, Fox MA, Yufit D, Beeby A, Davidson RJ. Divergent Approach for Tris-Heteroleptic Cyclometalated Iridium Complexes Using Triisopropylsilylethynyl-Substituted Synthons. Organometallics 2022; 41:2487-2493. [PMID: 36118103 PMCID: PMC9477230 DOI: 10.1021/acs.organomet.2c00292] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Indexed: 11/29/2022]
Abstract
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Bis-heteroleptic cyclometalated iridium
complexes
of the form Ir(La)2(acac), where La is a substituted 2-phenylpyridine derivative and acac is an acetylacetonato
ligand, are a useful class of luminescent organometallic complexes
for a range of applications. Related tris-heteroleptic
complexes of the form Ir(La)(Lb)(acac) offer
the potential advantage of greater functionality through the use of
two different cyclometalated ligands but are, in general, more difficult
to obtain. We report the synthesis of divergent bis- and tris-heteroleptic triisopropylsilylethynyl-substituted
intermediate complexes that can be diversified using a “chemistry-on-the-complex”
approach. We demonstrate the methodology through one-pot deprotection
and Sonogashira cross-coupling of the intermediate complexes with para-R-aryliodides (R = H, SMe, and CN). The photophysical
and electrochemical behaviors of the resultant bis- and tris-heteroleptic complexes are compared,
and it is shown that the tris-heteroleptic complexes
exhibit subtly different emission and redox properties to the bis-heteroleptic complexes, such as further red-shifted
emission maxima and lower extinction coefficients, which can be attributed
to the reduced symmetry. It is demonstrated, supported by DFT and
time-dependent DFT calculations, that the charge-transfer character
of the emission can be altered via variation of the terminal substituent;
the introduction of an electron-withdrawing cyano group in the terminal
position leads to a significant red shift, while the introduction
of an SMe group can substantially increase the emission quantum yield.
Most notably, this convenient synthetic approach reduces the need
to perform the often challenging isolation of tris-heteroleptic complexes to a single divergent intermediate, which
will simplify access to families of complexes of the form Ir(La)(Lb)(acac).
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Affiliation(s)
- Robert M. Edkins
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, U.K
| | - Yu-Ting Hsu
- Department of Chemistry, University of Durham, South Road, England, Durham DH1 3LE, U.K
| | - Mark A. Fox
- Department of Chemistry, University of Durham, South Road, England, Durham DH1 3LE, U.K
| | - Dmitry Yufit
- Department of Chemistry, University of Durham, South Road, England, Durham DH1 3LE, U.K
| | - Andrew Beeby
- Department of Chemistry, University of Durham, South Road, England, Durham DH1 3LE, U.K
| | - Ross J. Davidson
- Department of Chemistry, University of Durham, South Road, England, Durham DH1 3LE, U.K
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6
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Singh N, Hee Noh G, Mubarok H, Woo Kim C, Hyung Lee M, Lee J. Synthesis and Photophysical Studies on Cyclometalated Iridium Complexes Containing Various Monodentate Phenyl-azole Ancillary Ligands. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.116096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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7
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Solvent-controlled photosensitized divergent C3-ethoxycarbonylmethylation/hydroxyalkylation of imidazo[1,2-a]pyridines with diethyl bromomalonate. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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8
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Kim SY, Kim JH, Lee S, Yun BS, Son HJ, Kang SO. Tuning the Photophysical Properties of Homoleptic Tris-Cyclometalated Ir(III) Complexes by Facile Modification of the Imidazo-Phenanthridine and Their Application to Phosphorescent Organic Light-Emitting Diodes. ACS OMEGA 2022; 7:17234-17244. [PMID: 35647420 PMCID: PMC9134233 DOI: 10.1021/acsomega.2c01155] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Accepted: 04/29/2022] [Indexed: 05/07/2023]
Abstract
To explore the excited-state electronic structure of the blue-emitting Ir(dmp)3 dopant material (dmp = 3-(2,6-dimethylphenyl)-7-methylimidazo[1,2-f]phenanthridine), which is notable for durable blue phosphorescent organic light-emitting diode (PhOLED), a series of homoleptic dmp-based Ir(III) complexes (DMP-R, tris[3-(2,6-dimethylphenyl)-7-R-imidazo[1,2-f]phenanthridin-12-yl-κC 12,κN 1]iridium, R = H, CH3, F, and CF3) were prepared by introducing an electron-donating group (EDG; -CH3) or an electron-withdrawing group (EWG; -F and -CF3) at the 7-position of the imidazo-phenanthridine ligand. The photophysical analysis demonstrated that the alteration from EDG to EWGs led to redshifted structureless emission profiles, which were correlated with variations in the 3MLCT/3ILCT ratio in the T1 excited state. From electrochemical studies and density functional theory calculations, it turned out that the excited-state nature of the dmp-based Ir(III) complexes was significantly affected by the inductive effect of the 7-substituent of the cyclometalating dmp ligand. As a result of the lowest unoccupied molecular orbital energy stabilization by the EWGs that suppressed the non-radiative pathway from the emissive triplet excited state to the 3 d-d state, the F- and CF3-modified Ir(dmp)3 complexes (DMP-F and DMP-CF 3 ) showed quantum yields of 27-30% in the solution state, which were at least 4- or 5-fold higher than those shown by DMP-H and DMP-CH 3 . A PhOLED device based on DMP-CF 3 [CIE chromaticity (0.17, 0.39)], which demonstrated a distinct 3MLCT characteristic, exhibited better electroluminescent efficiencies with an external quantum efficiency of 13.5% than that based on DMP-CH 3 .
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9
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Phenanthroimidazole substituted imidazo[1,2-a]pyridine derivatives for deep-blue electroluminescence with CIEy ∼ 0.08. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2021.113600] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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10
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Nipate DS, Sonam, Shinde VN, Rangan K, Kumar A. TEMPO-Mediated Synthesis of Indolyl/Imidazo[1,2- a]pyridinyl-Substituted para-Quinone Methides from Butylated Hydroxytoluene. J Org Chem 2021; 86:17090-17100. [PMID: 34762443 DOI: 10.1021/acs.joc.1c02202] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of indolyl or imidazo[1,2-a]pyridinyl-substituted para-quinone methides (p-QMs) is prepared by a metal-free, TEMPO-mediated cross-dehydrogenative coupling of butylated hydroxytoluene (BHT) with indoles or imidazo[1,2-a]pyridines in good to high yields. Broad substrate scope with respect to indoles and imidazo[1,2-a]pyridines, good functional group tolerance, and acid/base-free conditions are advantageous feature of the developed protocol. The method was amenable for scale-up on the gram scale. Based on control experiments, a reaction mechanism is proposed to describe this transformation.
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Affiliation(s)
- Dhananjay S Nipate
- Department of Chemistry, Birla Institute of Technology & Science Pilani, Pilani Campus, Rajasthan 333031, India
| | - Sonam
- Department of Chemistry, Birla Institute of Technology & Science Pilani, Pilani Campus, Rajasthan 333031, India
| | - Vikki N Shinde
- Department of Chemistry, Birla Institute of Technology & Science Pilani, Pilani Campus, Rajasthan 333031, India
| | - Krishnan Rangan
- Department of Chemistry, Birla Institute of Technology & Science Pilani, Hyderabad Campus, Telangana 500078, India
| | - Anil Kumar
- Department of Chemistry, Birla Institute of Technology & Science Pilani, Pilani Campus, Rajasthan 333031, India
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11
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Lafzi F, Kilic H. Metal‐ and Additive‐Free C3‐Functionalization of Imidazo[1,2‐
a
]pyridines with
para
‐Quinone Methides. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100313] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ferruh Lafzi
- Department of Chemistry Faculty of Sciences Atatürk University 25240 Erzurum Turkey
| | - Haydar Kilic
- Department of Chemistry Faculty of Sciences Atatürk University 25240 Erzurum Turkey
- Oltu Vocational Training School Atatürk University 25400 Erzurum Turkey
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12
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Singh D, Chowdhury SR, Pramanik S, Maity S. Molecular iodine enabled generation of iminyl radicals from oximes: A facile route to imidazo[1,2-a]pyridines and its regioselective C-3 sulfenylated products from simple pyridines. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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13
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Guchhait SK, Saini M, Khivsara VJ, Giri SK. Annulation of Conjugated Azine-Imine with a Sulfoxonium Ylide in a Noncarbenoid Route to Synthesize Multisubstituted Imidazole-Fused Heterocycles. J Org Chem 2021; 86:5380-5387. [PMID: 33759525 DOI: 10.1021/acs.joc.1c00052] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A new [4+1]-annulation of in situ generated heterocyclic azine-aldimines with β-keto sulfoxonium ylides has been developed. The reaction constructs N-fused imidazole rings. In the reaction, the ylides play a dual-functional role of a nucleophilic 1,1-dipolar one-carbon synthon and a source of an internal oxidant, dimethyl sulfoxide, that promotes in situ dehydrogenation to product scaffolds. The method enables access to imidazo-pyridine, pyrazine, and pyrimidine heteroaromatics.
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Affiliation(s)
- Sankar K Guchhait
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, SAS Nagar, Mohali, Punjab 160062, India
| | - Meenu Saini
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, SAS Nagar, Mohali, Punjab 160062, India
| | - Viren J Khivsara
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, SAS Nagar, Mohali, Punjab 160062, India
| | - Santosh K Giri
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, SAS Nagar, Mohali, Punjab 160062, India
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14
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Shinde VN, Kanchan Roy T, Jaspal S, Nipate DS, Meena N, Rangan K, Kumar D, Kumar A. Rhodium(III)‐Catalyzed Annulation of 2‐Arylimidazo[1,2‐
a
]pyridines with Maleimides: Synthesis of 1
H
‐Benzo[
e
]pyrido[1′,2′:1,2]imidazo[4,5‐
g
]isoindole‐1,3(2
H
)‐Diones and their Photophysical Studies. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000960] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Vikki N. Shinde
- Department of Chemistry Birla Institute of Technology and Science Pilani, Pilani Campus Pilani Rajasthan 333031 India
| | - Tapta Kanchan Roy
- Department of Chemistry and Chemical Sciences Central University of Jammu Rahya Suchani J&K 181143 India
| | - Sonam Jaspal
- Department of Chemistry Birla Institute of Technology and Science Pilani, Pilani Campus Pilani Rajasthan 333031 India
| | - Dhananjay S. Nipate
- Department of Chemistry Birla Institute of Technology and Science Pilani, Pilani Campus Pilani Rajasthan 333031 India
| | - Neha Meena
- Department of Chemistry Birla Institute of Technology and Science Pilani, Pilani Campus Pilani Rajasthan 333031 India
| | - Krishnan Rangan
- Department of Chemistry Birla Institute of Technology and Science Pilani, Hyderbad Campus Hyderabad Telangana 500078 India
| | - Dalip Kumar
- Department of Chemistry Birla Institute of Technology and Science Pilani, Pilani Campus Pilani Rajasthan 333031 India
| | - Anil Kumar
- Department of Chemistry Birla Institute of Technology and Science Pilani, Pilani Campus Pilani Rajasthan 333031 India
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15
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Breton‐Patient C, Naud‐Martin D, Mahuteau‐Betzer F, Piguel S. Three‐Component C–H Bond Sulfonylation of Imidazoheterocycles by Visible‐Light Organophotoredox Catalysis. European J Org Chem 2020. [DOI: 10.1002/ejoc.202001219] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Chloé Breton‐Patient
- CNRS UMR9187, Inserm U1196 Université Paris‐Saclay 91400 Orsay France
- CNRS UMR9187, Inserm U1196 Institut Curie, Université PSL 91400 Orsay France
| | | | | | - Sandrine Piguel
- CNRS UMR9187, Inserm U1196 Université Paris‐Saclay 91400 Orsay France
- CNRS UMR9187, Inserm U1196 Institut Curie, Université PSL 91400 Orsay France
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16
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Gao F, Sun K, Chen XL, Shi T, Li XY, Qu LB, Zhao YF, Yu B. Visible-Light-Induced Phosphorylation of Imidazo-Fused Heterocycles under Metal-Free Conditions. J Org Chem 2020; 85:14744-14752. [PMID: 33136392 DOI: 10.1021/acs.joc.0c02107] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A metal-free and base-free procedure for the phosphorylation of imidazo[1,2-a]pyridines with phosphine oxides under the irradiation of visible light at room temperature in green solvent was reported, featuring mild and sustainable conditions, convenient operation, as well as good functional group compatibility.
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Affiliation(s)
- Fan Gao
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Kexue Road No. 100, Zhengzhou 450001, China
| | - Kai Sun
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Kexue Road No. 100, Zhengzhou 450001, China
| | - Xiao-Lan Chen
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Kexue Road No. 100, Zhengzhou 450001, China
| | - Tao Shi
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Kexue Road No. 100, Zhengzhou 450001, China
| | - Xiao-Yun Li
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Kexue Road No. 100, Zhengzhou 450001, China
| | - Ling-Bo Qu
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Kexue Road No. 100, Zhengzhou 450001, China
| | - Yu-Fen Zhao
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Kexue Road No. 100, Zhengzhou 450001, China.,Institute Drug Discovery Technology, Ningbo University, Ningbo 315211, Zhejiang, China
| | - Bing Yu
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Kexue Road No. 100, Zhengzhou 450001, China
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17
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Godugu K, Nallagondu CGR. Solvent and catalyst‐free synthesis of imidazo[1,2‐a]pyridines by grindstone chemistry. J Heterocycl Chem 2020. [DOI: 10.1002/jhet.4164] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Kumar Godugu
- Department of Chemistry, Green and Sustainable Synthetic Organic Chemistry Laboratory Yogi Vemana University Kadapa India
| | - Chinna Gangi Reddy Nallagondu
- Department of Chemistry, Green and Sustainable Synthetic Organic Chemistry Laboratory Yogi Vemana University Kadapa India
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18
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New yellow-emitting iridium(III) complexes containing 2-phenyl-2H-indazole-based ligands for high efficient OLEDs with EQE over 25%. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119704] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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19
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Dou S, Jia X, Liu Z, Meng Y, Mo Z, Li G, Niu Z. Cyclometalated iridium(
III
) complexes containing
2‐phenyl‐2
H
‐indazole ligand: Synthesis, photophysical studies, and
DFT
calculations. J CHIN CHEM SOC-TAIP 2020. [DOI: 10.1002/jccs.202000271] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Shao‐Bin Dou
- Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province, College of Chemistry and Chemical Engineering Hainan Normal University Haikou China
| | - Xing‐Liang Jia
- Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province, College of Chemistry and Chemical Engineering Hainan Normal University Haikou China
| | - Zhi‐Jun Liu
- Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province, College of Chemistry and Chemical Engineering Hainan Normal University Haikou China
| | - Ya‐Qi Meng
- Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province, College of Chemistry and Chemical Engineering Hainan Normal University Haikou China
| | - Zheng‐Rong Mo
- Key Laboratory of Tropical Medicinal Plant Chemistry of Ministry of Education Hainan Normal University Haikou China
| | - Gao‐Nan Li
- Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province, College of Chemistry and Chemical Engineering Hainan Normal University Haikou China
| | - Zhi‐Gang Niu
- Key Laboratory of Tropical Medicinal Plant Chemistry of Ministry of Education Hainan Normal University Haikou China
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20
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Pinter P, Soellner J, Strassner T. Heteroleptic Cyclometalated NHC Iridium(III) complex with a bulky acetylacetonate: Photophysics of an unexplored class of compounds. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121251] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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21
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Le Bescont J, Breton-Patient C, Piguel S. Unconventional Reactivity with DABCO-Bis
(sulfur dioxide): C-H Bond Sulfenylation of Imidazopyridines. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000112] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Julie Le Bescont
- CNRS, Inserm; Université Paris-Saclay; 91405 Orsay France
- CNRS, Inserm; Institut Curie; 91402 Orsay France
| | - Chloé Breton-Patient
- CNRS, Inserm; Université Paris-Saclay; 91405 Orsay France
- CNRS, Inserm; Institut Curie; 91402 Orsay France
| | - Sandrine Piguel
- CNRS, Inserm; Université Paris-Saclay; 91405 Orsay France
- CNRS, Inserm; Institut Curie; 91402 Orsay France
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22
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Shah SS, Shee M, Singh AK, Paul A, Singh NDP. Direct Oxygenation of C-H Bonds through Photoredox and Palladium Catalysis. J Org Chem 2020; 85:3426-3439. [PMID: 31955576 DOI: 10.1021/acs.joc.9b03197] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
This report presents the oxygenation of C-H bonds via the merger of photocatalysis and Pd catalysis. Herein, we describe the utilization of a photocatalyst to oxidize an organopalladium(II) intermediate to high-valent PdIII or PdIV intermediates, which promotes the formation of C-O bonds. The demonstrated method works efficiently with various directing groups, such as oxime ether and benzothiazole. The applicability of this direct C-O bond formation method is shown by synthesizing several metal complexes of 2-(benzo[d]thiazol-2-yl)phenol that can be used in organic light-emitting diodes and pharmaceuticals.
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Affiliation(s)
- Sk Sheriff Shah
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India
| | - Maniklal Shee
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India
| | - Amit Kumar Singh
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India
| | - Amrita Paul
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India
| | - N D Pradeep Singh
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India
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23
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Kim JH, Kim SY, Jang S, Yi S, Cho DW, Son HJ, Kang SO. Blue Phosphorescence with High Quantum Efficiency Engaging the Trifluoromethylsulfonyl Group to Iridium Phenylpyridine Complexes. Inorg Chem 2019; 58:16112-16125. [DOI: 10.1021/acs.inorgchem.9b02672] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Jin-Hyoung Kim
- Department of Advanced Materials Chemistry, Korea University, Sejong 30019, Korea
| | - So-Yoen Kim
- Department of Advanced Materials Chemistry, Korea University, Sejong 30019, Korea
| | - Seol Jang
- Department of Advanced Materials Chemistry, Korea University, Sejong 30019, Korea
| | - Seungjun Yi
- Department of Advanced Materials Chemistry, Korea University, Sejong 30019, Korea
| | - Dae Won Cho
- Department of Advanced Materials Chemistry, Korea University, Sejong 30019, Korea
| | - Ho-Jin Son
- Department of Advanced Materials Chemistry, Korea University, Sejong 30019, Korea
| | - Sang Ook Kang
- Department of Advanced Materials Chemistry, Korea University, Sejong 30019, Korea
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24
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Chen Y, Liu C, Wang L. Effects of fluorine substituent on properties of cyclometalated iridium(III) complexes with a 2,2′-bipyridine ancillary ligand. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.130686] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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25
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Li N, Bai J, Zheng X, Rao H. Formation of Methylene Linkage for N-Heterocycles: Sequential C–H and C–O Bond Functionalization of Methanol with Cosolvent Water. J Org Chem 2019; 84:6928-6939. [DOI: 10.1021/acs.joc.9b00729] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Na Li
- Department of Chemistry, Capital Normal University, Beijing 100048, P. R. China
| | - Jinku Bai
- Department of Chemistry, Capital Normal University, Beijing 100048, P. R. China
| | - Xiaolin Zheng
- Department of Chemistry, Capital Normal University, Beijing 100048, P. R. China
| | - Honghua Rao
- Department of Chemistry, Capital Normal University, Beijing 100048, P. R. China
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
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26
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Thakor KP, Lunagariya MV, Bhatt BS, Patel MN. Fluorescence and Absorption Titrations of Bio-relevant Imidazole Based Organometallic Pd(II) Complexes with DNA: Synthesis, Characterization, DNA Interaction, Antimicrobial, Cytotoxic and Molecular Docking Studies. J Inorg Organomet Polym Mater 2019. [DOI: 10.1007/s10904-019-01184-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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27
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Wang R, Wang S, Li D, Ye F, Leng Y, Wu Y, Chang J, Wu Y. Radical ring opening reaction of pyridine fused heterocycles with IBA-N3 catalyzed by tetra-n-butylammonium iodide. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.02.061] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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28
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Gao TB, Yan RQ, Metherell AJ, Cao DK, Ye DJ, Ward MD. Coordination mode-induced isomeric cyclometalated [Ir(tpy)(nbi)Cl](PF 6) complexes: distinct luminescence, self-assembly and cellular imaging behaviors. Dalton Trans 2018; 46:16787-16791. [PMID: 29168515 DOI: 10.1039/c7dt03523c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two isomeric Ir(iii) complexes Ir-O and Ir-R arising from the different coordination mode of a naphthalene-containing ligand, show distinct luminescence, self-assembly ability and cellular imaging behaviors.
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Affiliation(s)
- Tai-Bao Gao
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China.
| | - Run-Qi Yan
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China.
| | | | - Deng-Ke Cao
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China.
| | - De-Ju Ye
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China.
| | - Michael D Ward
- Department of Chemistry, University of Sheffield, Sheffield S3 7HF, UK. and Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK
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29
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Davidson RJ, Hsu YT, Yufit D, Beeby A. Emission Tuning of Ir(N∧C)2(pic)-Based Complexes via Torsional Twisting of Picolinate Substituents. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00194] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Ross J. Davidson
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
| | - Yu-Ting Hsu
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
| | - Dmitry Yufit
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
| | - Andrew Beeby
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
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30
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Zhao J, Liu B, Wang Z, Tong Q, Du X, Zheng C, Lin H, Tao S, Zhang X. EQE Climbing Over 6% at High Brightness of 14350 cd/m 2 in Deep-Blue OLEDs Based on Hybridized Local and Charge-Transfer Fluorescence. ACS APPLIED MATERIALS & INTERFACES 2018; 10:9629-9637. [PMID: 29498275 DOI: 10.1021/acsami.7b19646] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Three deep-blue emitters PPi-Pid, PPi-Xid, and PPi-Mid based on a novel conjugated system phenantroimidazole-π-indolizine have been designed and synthesized. Here, indolizine with appropriate π-conjugation length was used as the acceptor profited from its high-photoluminescence quantum yield and good electron-withdrawing ability. Fluorescent organic light-emitting diodes (OLEDs) based on PPi-Pid, PPi-Xid, and PPi-Mid achieved deep-blue emissions with the Commission Internationale de L'Eclairage coordinates of (0.151, 0.076), (0.155, 0.052), and (0.153, 0.052); high brightness of 14350, 4377, and 4002 cd/m2; and high external quantum efficiencies (EQEs) of 6.01, 3.90, and 4.28%, respectively. Moreover, it is noticeable that all of the devices exhibited efficiencies increasing with brightness. In particular, the PPi-Pid-based device exhibited high EQE over 6% at a high brightness of 14350 cd/m2. Such high brightness along with high EQE is very rare whether in deep-blue fluorescent or thermally activated delayed fluorescent OLEDs.
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Affiliation(s)
- Juewen Zhao
- School of Optoelectronic Information , University of Electronic Science and Technology of China (UESTC) , Chengdu 610054 , P. R. China
| | - Bin Liu
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province , Shantou University , Shantou , Guangdong 515063 , P. R. China
| | - Zhongyi Wang
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province , Shantou University , Shantou , Guangdong 515063 , P. R. China
| | - Qingxiao Tong
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province , Shantou University , Shantou , Guangdong 515063 , P. R. China
| | - Xiaoyang Du
- School of Optoelectronic Information , University of Electronic Science and Technology of China (UESTC) , Chengdu 610054 , P. R. China
| | - Caijun Zheng
- School of Optoelectronic Information , University of Electronic Science and Technology of China (UESTC) , Chengdu 610054 , P. R. China
| | - Hui Lin
- School of Optoelectronic Information , University of Electronic Science and Technology of China (UESTC) , Chengdu 610054 , P. R. China
| | - Silu Tao
- School of Optoelectronic Information , University of Electronic Science and Technology of China (UESTC) , Chengdu 610054 , P. R. China
| | - Xiaohong Zhang
- Institute of Functional Nano & Soft Materials (FUNSOM) , Soochow University , Suzhou 215123 , P. R. China
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31
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Junquera-Hernández JM, Escobar J, Ortí E. Electronic nature of the emitting triplet in SF 5 -substituted cationic Ir(III) complexes. Polyhedron 2018. [DOI: 10.1016/j.poly.2017.10.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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32
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Kour D, Gupta A, Kapoor KK, Gupta VK, Rajnikant R, Singh D, Das P. Iodine–NH4OAc mediated regioselective synthesis of 2-aroyl-3-arylimidazo[1,2-a]pyridines from 1,3-diaryl-prop-2-en-1-ones. Org Biomol Chem 2018; 16:1330-1336. [DOI: 10.1039/c7ob02750h] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient, metal-free regioselective synthesis of 2-aroyl-3-arylimidazo[1,2-a]pyridines from 1,3-diaryl-prop-2-en-1-ones has been developed by their reaction with 2-aminopyridine in the presence of I2/NH4OAc.
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Affiliation(s)
- Dilpreet Kour
- Department of Chemistry
- University of Jammu
- Jammu-180006
- India
| | - Annah Gupta
- Department of Chemistry
- University of Jammu
- Jammu-180006
- India
| | | | - Vivek K. Gupta
- X-ray Crystallographic Group
- Department of Physics
- University of Jammu
- Jammu-180006
- India
| | - Rajnikant Rajnikant
- X-ray Crystallographic Group
- Department of Physics
- University of Jammu
- Jammu-180006
- India
| | - Deepika Singh
- Medicinal Chemistry Division
- CSIR-Indian Institute of Integrative Medicine
- Jammu-180001
- India
| | - Parthasarathi Das
- Medicinal Chemistry Division
- CSIR-Indian Institute of Integrative Medicine
- Jammu-180001
- India
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33
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Congrave DG, Batsanov AS, Bryce MR. Highly luminescent 2-phenylpyridine-free diiridium complexes with bulky 1,2-diarylimidazole cyclometalating ligands. Dalton Trans 2018; 47:16524-16533. [DOI: 10.1039/c8dt04043e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
While a number of highly emissive dinuclear Ir(iii) complexes have been reported, they have generally been restricted to structures based on 2-phenylpyridine (Hppy) cyclometalates.
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34
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Altınölçek N, Aydemir M, Tavaslı M, Dos Santos PL, Monkman AP. Synthesis of biscyclometalated iridium(III) acetylacetonate complexes via a 15 min bridge-splitting reaction, their characterisations and photophysical properties. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2017.09.028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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35
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Synthesis and Optical Properties of Push-Push-Pull Chromophores Based on Imidazo[5,1,2-cd
]indolizines and Naphtho[1′
,2′
:4,5]imidazo[1,2-a
]pyridines. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701109] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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36
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Kajjam AB, Vaidyanathan S. Structural Mimics of Phenyl Pyridine (ppy) - Substituted, Phosphorescent Cyclometalated Homo and Heteroleptic Iridium(III) Complexes for Organic Light Emitting Diodes - An Overview. CHEM REC 2017; 18:293-349. [PMID: 28929624 DOI: 10.1002/tcr.201700035] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Indexed: 01/13/2023]
Abstract
Today organic light emitting diodes are a topic of significant academic and industrial research interest. OLED technology is used in commercially available displays, and efforts have been directed to improve this technology. Design and synthesis of phosphorescent based transition metals are capable of harvesting both singlet and triplet excitons and achieve 100 % internal quantum efficiency is an active area of research. Among all the transition metals, iridium is considered a prime candidate for OLEDs due to its prominent photophysical characteristics. In the present review, we have concentrated on the Iridium based homo and heteroleptic complexes that have dissimilar substitutions on phenylpyridine ligands, different ancillary ligands and the effect of substitution on HOMO/LUMO energies and a brief discussion and correlation on the photophysical, electrochemical and device performances of the different complexes have been reviewed for organic light emitting diodes.
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Affiliation(s)
- Aravind Babu Kajjam
- Department of Chemistry, National Institute of Technology, Rourkela, Odisha, India
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37
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Zhu X, Shen XJ, Tian ZY, Lu S, Tian LL, Liu WB, Song B, Hao XQ. Rhodium-Catalyzed Direct Bis-cyanation of Arylimidazo[1,2-α]pyridine via Double C-H Activation. J Org Chem 2017; 82:6022-6031. [PMID: 28581299 DOI: 10.1021/acs.joc.6b03036] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
An efficient Cp*Rh(III)-catalyzed selective bis-cyanation of arylimidazo[1,2-α]pyridines with N-cyano-N-phenyl-p-methylbenzenesulfonamide via N-directed ortho double C-H activation has been developed. The reaction proceeds with broad functional group tolerance to furnish various cyanated imidazopyridines in high yields. The current methodology exhibits unique characteristics, including high bis-cyanation selectivity, operational convenience, and gram-scale production.
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Affiliation(s)
- Xinju Zhu
- College of Chemistry and Molecular Engineering, School of Life Sciences, Zhengzhou University , No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Xiao-Jing Shen
- College of Chemistry and Molecular Engineering, School of Life Sciences, Zhengzhou University , No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Zi-Yao Tian
- College of Chemistry and Molecular Engineering, School of Life Sciences, Zhengzhou University , No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Shuai Lu
- College of Chemistry and Molecular Engineering, School of Life Sciences, Zhengzhou University , No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Lu-Lu Tian
- College of Chemistry and Molecular Engineering, School of Life Sciences, Zhengzhou University , No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Wen-Bo Liu
- College of Chemistry and Molecular Engineering, School of Life Sciences, Zhengzhou University , No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Bing Song
- College of Chemistry and Molecular Engineering, School of Life Sciences, Zhengzhou University , No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Xin-Qi Hao
- College of Chemistry and Molecular Engineering, School of Life Sciences, Zhengzhou University , No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
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38
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Chang Q, Liu Z, Liu P, Yu L, Sun P. Visible-Light-Induced Regioselective Cyanomethylation of Imidazopyridines and Its Application in Drug Synthesis. J Org Chem 2017; 82:5391-5397. [DOI: 10.1021/acs.joc.7b00750] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Qing Chang
- College of Chemistry and
Materials Science, Jiangsu Provincial Key Laboratory of Material Cycle
Processes and Pollution Control, Jiangsu Collaborative Innovation
Center of Biomedical Functional Materials, Nanjing Normal University, Nanjing 210023, China
| | - Zhengyi Liu
- College of Chemistry and
Materials Science, Jiangsu Provincial Key Laboratory of Material Cycle
Processes and Pollution Control, Jiangsu Collaborative Innovation
Center of Biomedical Functional Materials, Nanjing Normal University, Nanjing 210023, China
| | - Ping Liu
- College of Chemistry and
Materials Science, Jiangsu Provincial Key Laboratory of Material Cycle
Processes and Pollution Control, Jiangsu Collaborative Innovation
Center of Biomedical Functional Materials, Nanjing Normal University, Nanjing 210023, China
| | - Lu Yu
- College of Chemistry and
Materials Science, Jiangsu Provincial Key Laboratory of Material Cycle
Processes and Pollution Control, Jiangsu Collaborative Innovation
Center of Biomedical Functional Materials, Nanjing Normal University, Nanjing 210023, China
| | - Peipei Sun
- College of Chemistry and
Materials Science, Jiangsu Provincial Key Laboratory of Material Cycle
Processes and Pollution Control, Jiangsu Collaborative Innovation
Center of Biomedical Functional Materials, Nanjing Normal University, Nanjing 210023, China
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39
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Chang Q, Wu Z, Yu L, Liu P, Sun P. Visible-light-mediated C3-azolylation of imidazo[1,2-a]pyridines with 2-bromoazoles. Org Biomol Chem 2017; 15:5318-5324. [DOI: 10.1039/c7ob00883j] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
3-Heterocycle-substituted imidazo[1,2-a]pyridines were produced by a visible-light-mediated coupling reaction of imidazo[1,2-a]pyridines with 2-bromoazoles.
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Affiliation(s)
- Qing Chang
- College of Chemistry and Materials Science
- Jiangsu Provincial Key Laboratory of Material Cycle Processes and Pollution Control
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials
- Nanjing Normal University
- Nanjing 210023
| | - Zhongjie Wu
- College of Chemistry and Materials Science
- Jiangsu Provincial Key Laboratory of Material Cycle Processes and Pollution Control
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials
- Nanjing Normal University
- Nanjing 210023
| | - Lu Yu
- College of Chemistry and Materials Science
- Jiangsu Provincial Key Laboratory of Material Cycle Processes and Pollution Control
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials
- Nanjing Normal University
- Nanjing 210023
| | - Ping Liu
- College of Chemistry and Materials Science
- Jiangsu Provincial Key Laboratory of Material Cycle Processes and Pollution Control
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials
- Nanjing Normal University
- Nanjing 210023
| | - Peipei Sun
- College of Chemistry and Materials Science
- Jiangsu Provincial Key Laboratory of Material Cycle Processes and Pollution Control
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials
- Nanjing Normal University
- Nanjing 210023
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40
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Gao Y, Chen S, Lu W, Gu W, Liu P, Sun P. Visible light-induced C3-sulfonamidation of imidazopyridines with sulfamides. Org Biomol Chem 2017; 15:8102-8109. [DOI: 10.1039/c7ob02029e] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A visible light-induced regioselective sulfonamidation of imidazo[1,2-a]pyridines was developed using sulfamides as the nitrogen sources and aqueous NaClO solution as the oxidant under mild conditions.
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Affiliation(s)
- Yongyuan Gao
- College of Chemistry and Materials Science
- Nanjing Normal University
- Jiangsu Provincial Key Laboratory of Material Cycle Processes and Pollution Control
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials
- Nanjing 210023
| | - Shu Chen
- College of Chemistry and Materials Science
- Nanjing Normal University
- Jiangsu Provincial Key Laboratory of Material Cycle Processes and Pollution Control
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials
- Nanjing 210023
| | - Weiye Lu
- College of Chemistry and Materials Science
- Nanjing Normal University
- Jiangsu Provincial Key Laboratory of Material Cycle Processes and Pollution Control
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials
- Nanjing 210023
| | - Weijin Gu
- College of Chemistry and Materials Science
- Nanjing Normal University
- Jiangsu Provincial Key Laboratory of Material Cycle Processes and Pollution Control
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials
- Nanjing 210023
| | - Ping Liu
- College of Chemistry and Materials Science
- Nanjing Normal University
- Jiangsu Provincial Key Laboratory of Material Cycle Processes and Pollution Control
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials
- Nanjing 210023
| | - Peipei Sun
- College of Chemistry and Materials Science
- Nanjing Normal University
- Jiangsu Provincial Key Laboratory of Material Cycle Processes and Pollution Control
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials
- Nanjing 210023
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41
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Palladium-Catalyzed Oxidative Cyclization for the Synthesis of 2-Alkylimidazo[5,1,2-cd]indolizines. European J Org Chem 2016. [DOI: 10.1002/ejoc.201601019] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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42
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Pal AK, Cordes DB, Slawin AMZ, Momblona C, Ortí E, Samuel IDW, Bolink HJ, Zysman-Colman E. Synthesis, Properties, and Light-Emitting Electrochemical Cell (LEEC) Device Fabrication of Cationic Ir(III) Complexes Bearing Electron-Withdrawing Groups on the Cyclometallating Ligands. Inorg Chem 2016; 55:10361-10376. [PMID: 27681985 PMCID: PMC5080635 DOI: 10.1021/acs.inorgchem.6b01602] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Indexed: 11/28/2022]
Abstract
The structure-property relationship study of a series of cationic Ir(III) complexes in the form of [Ir(C^N)2(dtBubpy)]PF6 [where dtBubpy = 4,4'-di-tert-butyl-2,2'-bipyridine and C^N = cyclometallating ligand bearing an electron-withdrawing group (EWG) at C4 of the phenyl substituent, i.e., -CF3 (1), -OCF3 (2), -SCF3 (3), -SO2CF3 (4)] has been investigated. The physical and optoelectronic properties of the four complexes were comprehensively characterized, including by X-ray diffraction analysis. All the complexes exhibit quasireversible dtBubpy-based reductions from -1.29 to -1.34 V (vs SCE). The oxidation processes are likewise quasireversible (metal + C^N ligand) and are between 1.54 and 1.72 V (vs SCE). The relative oxidation potentials follow a general trend associated with the Hammett parameter (σ) of the EWGs. Surprisingly, complex 4 bearing the strongest EWG does not adhere to the expected Hammett behavior and was found to exhibit red-shifted absorption and emission maxima. Nevertheless, the concept of introducing EWGs was found to be generally useful in blue-shifting the emission maxima of the complexes (λem = 484-545 nm) compared to that of the prototype complex [Ir(ppy)2(dtBubpy)]PF6 (where ppy = 2-phenylpyridinato) (λem = 591 nm). The complexes were found to be bright emitters in solution at room temperature (ΦPL = 45-66%) with microsecond excited-state lifetimes (τe = 1.14-4.28 μs). The photophysical properties along with density functional theory (DFT) calculations suggest that the emission of these complexes originates from mixed contributions from ligand-centered (LC) transitions and mixed metal-to-ligand and ligand-to-ligand charge transfer (LLCT/MLCT) transitions, depending on the EWG. In complexes 1, 3, and 4 the 3LC character is prominent over the mixed 3CT character, while in complex 2, the mixed 3CT character is much more pronounced, as demonstrated by DFT calculations and the observed positive solvatochromism effect. Due to the quasireversible nature of the oxidation and reduction waves, fabrication of light-emitting electrochemical cells (LEECs) using these complexes as emitters was possible with the LEECs showing moderate efficiencies.
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Affiliation(s)
- Amlan K. Pal
- Organic Semiconductor Centre, EaStCHEM
School of Chemistry, University of St Andrews, St Andrews, Fife KY16 9ST, United Kingdom
| | - David B. Cordes
- EaStCHEM School of Chemistry, University
of St Andrews, St Andrews, Fife KY16 9ST, United Kingdom
| | - Alexandra M. Z. Slawin
- EaStCHEM School of Chemistry, University
of St Andrews, St Andrews, Fife KY16 9ST, United Kingdom
| | - Cristina Momblona
- Instituto de Ciencia Molecular, Universidad de Valencia, C/J. Beltran 2, 46980 Paterna, Spain
| | - Enrique Ortí
- Instituto de Ciencia Molecular, Universidad de Valencia, C/J. Beltran 2, 46980 Paterna, Spain
| | - Ifor D. W. Samuel
- Organic Semiconductor
Centre, SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, Fife KY16 9SS, United Kingdom
| | - Henk J. Bolink
- Instituto de Ciencia Molecular, Universidad de Valencia, C/J. Beltran 2, 46980 Paterna, Spain
| | - Eli Zysman-Colman
- Organic Semiconductor Centre, EaStCHEM
School of Chemistry, University of St Andrews, St Andrews, Fife KY16 9ST, United Kingdom
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43
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Lu S, Zhu X, Li K, Guo YJ, Wang MD, Zhao XM, Hao XQ, Song MP. Reactivity of p-Toluenesulfonylmethyl Isocyanide: Iron-Involved C–H Tosylmethylation of Imidazopyridines in Nontoxic Media. J Org Chem 2016; 81:8370-7. [DOI: 10.1021/acs.joc.6b01552] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Shuai Lu
- College of Chemistry and
Molecular Engineering, Henan Key Laboratory of Chemical Biology and
Organic Chemisry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Xinju Zhu
- College of Chemistry and
Molecular Engineering, Henan Key Laboratory of Chemical Biology and
Organic Chemisry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Ke Li
- College of Chemistry and
Molecular Engineering, Henan Key Laboratory of Chemical Biology and
Organic Chemisry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Yu-Jing Guo
- College of Chemistry and
Molecular Engineering, Henan Key Laboratory of Chemical Biology and
Organic Chemisry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Meng-Dan Wang
- College of Chemistry and
Molecular Engineering, Henan Key Laboratory of Chemical Biology and
Organic Chemisry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Xue-Mei Zhao
- College of Chemistry and
Molecular Engineering, Henan Key Laboratory of Chemical Biology and
Organic Chemisry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Xin-Qi Hao
- College of Chemistry and
Molecular Engineering, Henan Key Laboratory of Chemical Biology and
Organic Chemisry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Mao-Ping Song
- College of Chemistry and
Molecular Engineering, Henan Key Laboratory of Chemical Biology and
Organic Chemisry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
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44
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Kong D, Wang X, Shi Z, Wu M, Lin Q, Wang X. Solvent- and catalyst-free synthesis of imidazo[1,2-a]pyridines under microwave irradiation. JOURNAL OF CHEMICAL RESEARCH 2016. [DOI: 10.3184/174751916x14683327937934] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A facile solvent- and catalyst-free method for the synthesis of a series of imidazo[1,2-a]pyridines in good to excellent yields by the condensation of 2-aminopyridines with α-bromoketones under microwave irradiation has been developed. The important features of this method are that it is reasonably fast, very clean, high yielding, simple workup and environmentally benign.
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Affiliation(s)
- Dulin Kong
- School of Pharmaceutical Sciences, Hainan Medical University, Haikou 571199, Hainan Province, P.R. China
- Key Laboratory of Soft Chemistry and Functional Materials, Nanjing University of Science and Technology, Ministry of Education, Nanjing 210094, P.R. China
| | - Xianghui Wang
- Key Laboratory of Tropical Medicinal Plant Chemistry of the Ministry of Education, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, P.R. China
| | - Zaifeng Shi
- Key Laboratory of Tropical Medicinal Plant Chemistry of the Ministry of Education, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, P.R. China
| | - Mingshu Wu
- Key Laboratory of Tropical Medicinal Plant Chemistry of the Ministry of Education, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, P.R. China
| | - Qiang Lin
- Key Laboratory of Soft Chemistry and Functional Materials, Nanjing University of Science and Technology, Ministry of Education, Nanjing 210094, P.R. China
- Key Laboratory of Tropical Medicinal Plant Chemistry of the Ministry of Education, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, P.R. China
| | - Xin Wang
- Key Laboratory of Soft Chemistry and Functional Materials, Nanjing University of Science and Technology, Ministry of Education, Nanjing 210094, P.R. China
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45
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Porras JA, Mills IN, Transue WJ, Bernhard S. Highly Fluorinated Ir(III)-2,2':6',2″-Terpyridine-Phenylpyridine-X Complexes via Selective C-F Activation: Robust Photocatalysts for Solar Fuel Generation and Photoredox Catalysis. J Am Chem Soc 2016; 138:9460-72. [PMID: 27387149 DOI: 10.1021/jacs.6b03246] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A series of fluorinated Ir(III)-terpyridine-phenylpyridine-X (X = anionic monodentate ligand) complexes were synthesized by selective C-F activation, whereby perfluorinated phenylpyridines were readily complexed. The combination of fluorinated phenylpyridine ligands with an electron-rich tri-tert-butyl terpyridine ligand generates a "push-pull" force on the electrons upon excitation, imparting significant enhancements to the stability, electrochemical, and photophysical properties of the complexes. Application of the complexes as photosensitizers for photocatalytic generation of hydrogen from water and as redox photocatalysts for decarboxylative fluorination of several carboxylic acids showcases the performance of the complexes in highly coordinating solvents, in some cases exceeding that of the leading photosensitizers. Changes in the photophysical properties and the nature of the excited states are observed as the compounds increase in fluorination as well as upon exchange of the ancillary chloride ligand to a cyanide. These changes in the excited states have been corroborated using density functional theory modeling.
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Affiliation(s)
- Jonathan A Porras
- Department of Chemistry, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
| | - Isaac N Mills
- Department of Chemistry, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
| | - Wesley J Transue
- Department of Chemistry, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
| | - Stefan Bernhard
- Department of Chemistry, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
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46
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Sarma M, Chatterjee T, Bodapati R, Krishnakanth KN, Hamad S, Venugopal Rao S, Das SK. Cyclometalated Iridium(III) Complexes Containing 4,4′-π-Conjugated 2,2′-Bipyridine Derivatives as the Ancillary Ligands: Synthesis, Photophysics, and Computational Studies. Inorg Chem 2016; 55:3530-40. [DOI: 10.1021/acs.inorgchem.5b02999] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Monima Sarma
- School of Chemistry, ‡Advanced Centre of Research in High Energy Materials
(ACRHEM), and §School of Physics, University of Hyderabad, Central University, Hyderabad 500 046, India
| | - Tanmay Chatterjee
- School of Chemistry, ‡Advanced Centre of Research in High Energy Materials
(ACRHEM), and §School of Physics, University of Hyderabad, Central University, Hyderabad 500 046, India
| | - Ramakrishna Bodapati
- School of Chemistry, ‡Advanced Centre of Research in High Energy Materials
(ACRHEM), and §School of Physics, University of Hyderabad, Central University, Hyderabad 500 046, India
| | - Katturi Naga Krishnakanth
- School of Chemistry, ‡Advanced Centre of Research in High Energy Materials
(ACRHEM), and §School of Physics, University of Hyderabad, Central University, Hyderabad 500 046, India
| | - Syed Hamad
- School of Chemistry, ‡Advanced Centre of Research in High Energy Materials
(ACRHEM), and §School of Physics, University of Hyderabad, Central University, Hyderabad 500 046, India
| | - S. Venugopal Rao
- School of Chemistry, ‡Advanced Centre of Research in High Energy Materials
(ACRHEM), and §School of Physics, University of Hyderabad, Central University, Hyderabad 500 046, India
| | - Samar K. Das
- School of Chemistry, ‡Advanced Centre of Research in High Energy Materials
(ACRHEM), and §School of Physics, University of Hyderabad, Central University, Hyderabad 500 046, India
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47
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Gao Y, Lu W, Liu P, Sun P. Iron-Catalyzed Regioselective Alkoxycarbonylation of Imidazoheterocycles with Carbazates. J Org Chem 2016; 81:2482-7. [DOI: 10.1021/acs.joc.6b00046] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Yongyuan Gao
- College of Chemistry and
Materials Science, Jiangsu Provincial Key Laboratory of Material Cycle
Processes and Pollution Control, Jiangsu Collaborative Innovation
Center of Biomedical Functional Materials, Nanjing Normal University, Nanjing 210023, China
| | - Weiye Lu
- College of Chemistry and
Materials Science, Jiangsu Provincial Key Laboratory of Material Cycle
Processes and Pollution Control, Jiangsu Collaborative Innovation
Center of Biomedical Functional Materials, Nanjing Normal University, Nanjing 210023, China
| | - Ping Liu
- College of Chemistry and
Materials Science, Jiangsu Provincial Key Laboratory of Material Cycle
Processes and Pollution Control, Jiangsu Collaborative Innovation
Center of Biomedical Functional Materials, Nanjing Normal University, Nanjing 210023, China
| | - Peipei Sun
- College of Chemistry and
Materials Science, Jiangsu Provincial Key Laboratory of Material Cycle
Processes and Pollution Control, Jiangsu Collaborative Innovation
Center of Biomedical Functional Materials, Nanjing Normal University, Nanjing 210023, China
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48
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Mandlimath TR, Sathiyanarayanan KI. Facile synthesis of ZnAl2O4nanoparticles: efficient and reusable porous nano ZnAl2O4and copper supported on ZnAl2O4catalysts for one pot green synthesis of propargylamines and imidazo[1,2-a]pyridines by A3coupling reactions. RSC Adv 2016. [DOI: 10.1039/c5ra20812b] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A simple, facile and efficient route was developed for the synthesis of nano ZnAl2O4using ethanolamine.
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49
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Liu P, Shen Z, Yuan Y, Sun P. Synthesis of symmetrical methylene-bridged imidazoheterocycles using DMSO as methylene source under metal-free conditions. Org Biomol Chem 2016; 14:6523-30. [DOI: 10.1039/c6ob00977h] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Methylene-bridged imidazo-heterocycles were synthesized by a H3PO4-promoted bridging methylenation of imidazopyridines or similar heterocycles, in which DMSO was used as the carbon source.
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Affiliation(s)
- Ping Liu
- College of Chemistry and Materials Science
- Nanjing Normal University; Jiangsu Provincial Key Laboratory of Material Cycle Processes and Pollution Control
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials
- Nanjing 210023
- China
| | - Ziyan Shen
- College of Chemistry and Materials Science
- Nanjing Normal University; Jiangsu Provincial Key Laboratory of Material Cycle Processes and Pollution Control
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials
- Nanjing 210023
- China
| | - Yao Yuan
- College of Chemistry and Materials Science
- Nanjing Normal University; Jiangsu Provincial Key Laboratory of Material Cycle Processes and Pollution Control
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials
- Nanjing 210023
- China
| | - Peipei Sun
- College of Chemistry and Materials Science
- Nanjing Normal University; Jiangsu Provincial Key Laboratory of Material Cycle Processes and Pollution Control
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials
- Nanjing 210023
- China
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50
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Altınölçek N, Tavasli M, Aydemir M, Abay B, Monkman AP. Synthesis, thermal and optical properties of a novel bis(2-(4-dicyanovinylphenyl)pyridinato-N,C2)iridium(acetylacetonate). Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2015.10.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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