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Zhang H, Li W, Yan X, Cai W, Li M, He R, Shen W. Electronic structure and luminescence properties of unique complexes: cyclometalated iridium(iii) chelated by o-carboranyl-pyridine ligands. NEW J CHEM 2018. [DOI: 10.1039/c8nj00428e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Iridium(iii) complexes that use o-carborane as a chelating ligand have been theoretically investigated for the first time. The superior properties of complexes will potentially promote the discovery of efficient blue-emitting complexes.
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Affiliation(s)
- Huize Zhang
- School of Chemistry and Chemical Engineering
- Southwest University
- Chongqing 400715
- China
| | - Wenqian Li
- School of Chemistry and Chemical Engineering
- Southwest University
- Chongqing 400715
- China
| | - Xi Yan
- School of Chemistry and Chemical Engineering
- Southwest University
- Chongqing 400715
- China
| | - Wanlin Cai
- School of Chemistry and Chemical Engineering
- Southwest University
- Chongqing 400715
- China
| | - Ming Li
- School of Chemistry and Chemical Engineering
- Southwest University
- Chongqing 400715
- China
| | - Rongxing He
- School of Chemistry and Chemical Engineering
- Southwest University
- Chongqing 400715
- China
| | - Wei Shen
- School of Chemistry and Chemical Engineering
- Southwest University
- Chongqing 400715
- China
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2
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Eleazer B, Smith MD, Popov AA, Peryshkov DV. (BB)-Carboryne Complex of Ruthenium: Synthesis by Double B-H Activation at a Single Metal Center. J Am Chem Soc 2016; 138:10531-8. [PMID: 27526855 PMCID: PMC4999960 DOI: 10.1021/jacs.6b05172] [Citation(s) in RCA: 95] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Indexed: 12/22/2022]
Abstract
The first example of a transition metal (BB)-carboryne complex containing two boron atoms of the icosahedral cage connected to a single exohedral metal center (POBBOP)Ru(CO)2 (POBBOP = 1,7-OP(i-Pr)2-2,6-dehydro-m-carborane) was synthesized by double B-H activation within the strained m-carboranyl pincer framework. Theoretical calculations revealed that the unique three-membered (BB)>Ru metalacycle is formed by two bent B-Ru σ-bonds with the concomitant increase of the bond order between the two metalated boron atoms. The reactivity of the highly strained electron-rich (BB)-carboryne fragment with small molecules was probed by reactions with electrophiles. The carboryne-carboranyl transformations reported herein represent a new mode of cooperative metal-ligand reactivity of boron-based complexes.
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Affiliation(s)
- Bennett
J. Eleazer
- Department
of Chemistry and Biochemistry, University
of South Carolina, 631
Sumter Street, Columbia, South Carolina 29208, United States
| | - Mark D. Smith
- Department
of Chemistry and Biochemistry, University
of South Carolina, 631
Sumter Street, Columbia, South Carolina 29208, United States
| | - Alexey A. Popov
- Leibniz
Institute for Solid State and Materials Research, Helmholtzstrasse 20, 01069 Dresden, Germany
| | - Dmitry V. Peryshkov
- Department
of Chemistry and Biochemistry, University
of South Carolina, 631
Sumter Street, Columbia, South Carolina 29208, United States
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3
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Kirlikovali KO, Axtell JC, Gonzalez A, Phung AC, Khan SI, Spokoyny AM. Luminescent Metal Complexes Featuring Photophysically Innocent Boron Cluster Ligands. Chem Sci 2016; 7:5132-5138. [PMID: 28191302 PMCID: PMC5300762 DOI: 10.1039/c6sc01146b] [Citation(s) in RCA: 125] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 04/18/2016] [Indexed: 12/23/2022] Open
Abstract
We report the synthesis and characterization of a series of d8 metal complexes featuring robust and photophysically innocent strong-field chelating 1,1'-bis(o-carborane) (bc) ligand frameworks. A combination of UV-Vis spectroscopy, single crystal X-ray structural analysis, and DFT calculations of these species suggest that the dianionic bc ligand does not contribute to any visible metal-to-ligand charge transfer (MLCT) transitions, yet it provides a strong ligand field in these complexes. Furthermore, a bc-based Pt(II) complex containing a 4,4'-di-tert-butyl-2,2'-bipyridine ligand (dtb-bpy) has been prepared and was found to display blue phosphorescent emission dominated by MLCT from the Pt(II) center to the dtb-bpy ligand. Importantly, the bulky three-dimensional nature of the bc ligand precludes intermolecular Pt(II)⋯Pt(II) interactions in the solid state where the resulting compounds retain their emission properties. This study opens a potentially new avenue for designing organic light-emitting diode (OLED) materials with tunable properties featuring photophysically innocent boron-rich cluster ligands.
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Affiliation(s)
- Kent O. Kirlikovali
- Department of Chemistry and Biochemistry
, University of California
,
607 Charles E. Young Drive East
, Los Angeles
, California 90025-1569
, USA
.
; https://www.organomimetic.com
| | - Jonathan C. Axtell
- Department of Chemistry and Biochemistry
, University of California
,
607 Charles E. Young Drive East
, Los Angeles
, California 90025-1569
, USA
.
; https://www.organomimetic.com
| | - Alejandra Gonzalez
- Department of Chemistry and Biochemistry
, University of California
,
607 Charles E. Young Drive East
, Los Angeles
, California 90025-1569
, USA
.
; https://www.organomimetic.com
| | - Alice C. Phung
- Department of Chemistry and Biochemistry
, University of California
,
607 Charles E. Young Drive East
, Los Angeles
, California 90025-1569
, USA
.
; https://www.organomimetic.com
| | - Saeed I. Khan
- Department of Chemistry and Biochemistry
, University of California
,
607 Charles E. Young Drive East
, Los Angeles
, California 90025-1569
, USA
.
; https://www.organomimetic.com
| | - Alexander M. Spokoyny
- Department of Chemistry and Biochemistry
, University of California
,
607 Charles E. Young Drive East
, Los Angeles
, California 90025-1569
, USA
.
; https://www.organomimetic.com
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4
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Wannere CS, Schleyer PVR, Schaefer HF. The Design of "Neutral" Carbanions with Intramolecular Charge Compensation. J Org Chem 2016; 81:1885-98. [PMID: 26783848 DOI: 10.1021/acs.joc.5b02695] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Strategies to construct zwitterionic anions from the parent anions are proposed. Two principles are employed; the cationic counterpart is (a) attached as a substituent or (b) inserted as an integral part at a remote location in the assembly. The optimized geometries reveal that a striking similarity exists between the zwitterions and the respective precursor parent anion. The computed vibrational frequencies emphasize that these novel entities are minima on their respective potential energy surfaces. A substantial HOMO-LUMO gap indicates that the proposed structures do not show instability in their respective electronic states and that the higher energy configuration states do not contribute to the ground state viability. The separation of charge between the monopoles in these zwitterions is demonstrated by moderately large nonzero dipole moments. Significant large energy barriers for rearrangement to the closely related positional isomers, demonstrated in a few cases, advocate the thermal stability (associated with spectroscopic viability) of the novel molecules. The donor capacity (basicity) of the anionic subunit in these zwitterions is comparable to that of the respective parent anions. Since the qualitative and quantitative features in the designed charged compensated complexes are conserved as anions, these molecules may perhaps be employed in synthetic organic or organometallic chemistry.
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Affiliation(s)
- Chaitanya S Wannere
- Center for Computational Chemistry, University of Georgia , Athens, Georgia 30602, United States
| | - Paul v R Schleyer
- Center for Computational Chemistry, University of Georgia , Athens, Georgia 30602, United States
| | - Henry F Schaefer
- Center for Computational Chemistry, University of Georgia , Athens, Georgia 30602, United States
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5
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Baše T, Macháček J, Hájková Z, Langecker J, Kennedy JD, Carr MJ. Thermal isomerizations of monothiolated carboranes (HS)C 2 B 10 H 11 and the solid-state investigation of 9-(HS)-1,2-C 2 B 10 H 11 and 9-(HS)-1,7-C 2 B 10 H 11. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.06.020] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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6
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Otero R, Seoane S, Sigüeiro R, Belorusova AY, Maestro MA, Pérez-Fernández R, Rochel N, Mouriño A. Carborane-based design of a potent vitamin D receptor agonist. Chem Sci 2015; 7:1033-1037. [PMID: 28808527 PMCID: PMC5531031 DOI: 10.1039/c5sc03084f] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Accepted: 10/26/2015] [Indexed: 01/15/2023] Open
Abstract
The development of a promising clinical antitumor vitamin D analog possessing a side-chain o-carborane cluster that efficiently binds to VDR by unconventional dihydrogen bonding (BH···HN) is described.
The vitamin D nuclear receptor (VDR) is a potential target for cancer therapy. It is expressed in many tumors and its ligand shows anticancer actions. To combine these properties with the application of boron neutron capture therapy (BNCT), we design and synthesize a potent VDR agonist based on the skeleton of the hormone 1α,25-dihydroxyvitamin D3 (1,25D) and an o-carborane (dicarba-o-closo-1,2-dodecaborane) at the end of its side chain. The present ligand is the first secosteroidal analog with the carborane unit that efficiently binds to VDR and functions as an agonist with 1,25D-like potency in transcriptional assay on vitamin D target genes. Moreover it exhibits similar antiproliferative and pro-differentiating activities but is significantly less hypercalcemic than 1,25D. The crystal structure of its complex with VDR ligand binding domain reveals its binding mechanism involving boron-mediated dihydrogen bonds that mimic vitamin D hydroxyl interactions. In addition to the therapeutic interest, this study establishes the basis for the design of new unconventional vitamin D analogs containing carborane moieties for specific molecular recognition, and drug research and development.
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Affiliation(s)
- Rocio Otero
- Departamento de Química Orgánica , Laboratorio de Investigación Ignacio Ribas , Universidad de Santiago de Compostela , Avda. Ciencias s/n , 15782 Santiago de Compostela , Spain .
| | - Samuel Seoane
- Departamento de Fisiología-CIMUS , Universidad de Santiago , Avda. Barcelona s/n , 15706 Santiago de Compostela , Spain
| | - Rita Sigüeiro
- Departamento de Química Orgánica , Laboratorio de Investigación Ignacio Ribas , Universidad de Santiago de Compostela , Avda. Ciencias s/n , 15782 Santiago de Compostela , Spain . .,Department of Integrative Structural Biology , IGBMC - CNRS UMR7104 - Inserm U964 , 1, rue Laurent Fries , 67400 Illkirch , France .
| | - Anna Y Belorusova
- Department of Integrative Structural Biology , IGBMC - CNRS UMR7104 - Inserm U964 , 1, rue Laurent Fries , 67400 Illkirch , France .
| | - Miguel A Maestro
- Departmento de Química Fundamental , Universidad de A Coruña , Campus da Zapateira s/n , 15071 A Coruña , Spain
| | - Roman Pérez-Fernández
- Departamento de Fisiología-CIMUS , Universidad de Santiago , Avda. Barcelona s/n , 15706 Santiago de Compostela , Spain
| | - Natacha Rochel
- Department of Integrative Structural Biology , IGBMC - CNRS UMR7104 - Inserm U964 , 1, rue Laurent Fries , 67400 Illkirch , France .
| | - Antonio Mouriño
- Departamento de Química Orgánica , Laboratorio de Investigación Ignacio Ribas , Universidad de Santiago de Compostela , Avda. Ciencias s/n , 15782 Santiago de Compostela , Spain .
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7
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Galliamova LA, Varaksin MV, Chupakhin ON, Slepukhin PA, Charushin VN. Heterocyclic and Open-Chain Carboranes via Transition-Metal-Free C–H Functionalization of Mono- and Diazine-N-oxides. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00736] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Mikhail V. Varaksin
- Ural Federal University, 19
Mira Street, 620002 Ekaterinburg, Russia
- Institute
of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, 22 S. Kovalevskaya Street, 620990 Ekaterinburg, Russia
| | - Oleg N. Chupakhin
- Ural Federal University, 19
Mira Street, 620002 Ekaterinburg, Russia
- Institute
of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, 22 S. Kovalevskaya Street, 620990 Ekaterinburg, Russia
| | - Pavel A. Slepukhin
- Ural Federal University, 19
Mira Street, 620002 Ekaterinburg, Russia
- Institute
of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, 22 S. Kovalevskaya Street, 620990 Ekaterinburg, Russia
| | - Valery N. Charushin
- Ural Federal University, 19
Mira Street, 620002 Ekaterinburg, Russia
- Institute
of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, 22 S. Kovalevskaya Street, 620990 Ekaterinburg, Russia
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9
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Matuszewski M, Kiliszek A, Rypniewski W, Lesnikowski ZJ, Olejniczak AB. Nucleoside bearing boron clusters and their phosphoramidites – building blocks for modified oligonucleotide synthesis. NEW J CHEM 2015. [DOI: 10.1039/c4nj01096e] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Synthesis of four canonical nucleoside-closo-/nido-carborane conjugates, their phosphoramidites, their electrochemical characteristics and the first example of the X-ray structure of a nucleoside-boron cluster conjugate.
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Affiliation(s)
- Michał Matuszewski
- Institute of Organic Chemistry
- Lodz University of Technology
- 90-924 Lodz
- Poland
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10
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Pancharatna PD, Balakrishnarajan MM, Jemmis ED, Hoffmann R. Polyhedral Borane Analogues of the Benzynes and Beyond: Bonding in Variously Charged B12H10 Isomers. J Am Chem Soc 2012; 134:5916-20. [DOI: 10.1021/ja212055x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | - Eluvathingal D. Jemmis
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, CET Campus, Thiruvananthapuram 695 016, India
| | - Roald Hoffmann
- Baker Laboratories, Department
of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
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11
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Scholz M, Hey-Hawkins E. Carbaboranes as pharmacophores: properties, synthesis, and application strategies. Chem Rev 2011; 111:7035-62. [PMID: 21780840 DOI: 10.1021/cr200038x] [Citation(s) in RCA: 582] [Impact Index Per Article: 44.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Matthias Scholz
- Institut für Anorganische Chemie der Universität Leipzig, Germany
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