1
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Sohrabi M, Bikhof Torbati M, Lutz M, Meghdadi S, Farrokhpour H, Amiri A, Amirnasr M. Application of cyclometalated rhodium(III) complexes as therapeutic agents in biomedical and luminescent cellular imaging. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2021.113573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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2
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Dkhar L, Gupta H, Poluri KM, Gannon PM, Kaminsky W, Kollipara MR. Influence of counterions on the formation of supramolecular platinum group metal complexes containing pyridyl thioamide derivatives: antioxidant and antimicrobial studies. NEW J CHEM 2022. [DOI: 10.1039/d2nj03108f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of half-sandwich metal thioamide derivative complexes exhibiting interesting coordination modes in the presence of counterions.
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Affiliation(s)
- Lincoln Dkhar
- Center for Advanced Studies in Chemistry, North-Eastern Hill University, Shillong 793 022, India
| | - Hrishikesh Gupta
- Department of Biosciences and Bioengineering, Indian Institute of Technology Roorkee, Roorkee 247 667, India
| | - Krishna Mohan Poluri
- Department of Biosciences and Bioengineering, Indian Institute of Technology Roorkee, Roorkee 247 667, India
| | - Paige M. Gannon
- Department of Chemistry, University of Washington, Seattle, WA 98195, USA
| | - Werner Kaminsky
- Department of Chemistry, University of Washington, Seattle, WA 98195, USA
| | - Mohan Rao Kollipara
- Center for Advanced Studies in Chemistry, North-Eastern Hill University, Shillong 793 022, India
- Department of Chemistry, University of Washington, Seattle, WA 98195, USA
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3
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Dröge F, Noakes FF, Archer SA, Sreedharan S, Raza A, Robertson CC, MacNeil S, Haycock JW, Carson H, Meijer AJHM, Smythe CGW, Bernardino de la Serna J, Dietzek-Ivanšić B, Thomas JA. A Dinuclear Osmium(II) Complex Near-Infrared Nanoscopy Probe for Nuclear DNA. J Am Chem Soc 2021; 143:20442-20453. [PMID: 34808044 DOI: 10.1021/jacs.1c10325] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
With the aim of developing photostable near-infrared cell imaging probes, a convenient route to the synthesis of heteroleptic OsII complexes containing the Os(TAP)2 fragment is reported. This method was used to synthesize the dinuclear OsII complex, [{Os(TAP)2}2tpphz]4+ (where tpphz = tetrapyrido[3,2-a:2',3'-c:3″,2''-h:2‴,3'''-j]phenazine and TAP = 1,4,5,8- tetraazaphenanthrene). Using a combination of resonance Raman and time-resolved absorption spectroscopy, as well as computational studies, the excited state dynamics of the new complex were dissected. These studies revealed that, although the complex has several close lying excited states, its near-infrared, NIR, emission (λmax = 780 nm) is due to a low-lying Os → TAP based 3MCLT state. Cell-based studies revealed that unlike its RuII analogue, the new complex is neither cytotoxic nor photocytotoxic. However, as it is highly photostable as well as live-cell permeant and displays NIR luminescence within the biological optical window, its properties make it an ideal probe for optical microscopy, demonstrated by its use as a super-resolution NIR STED probe for nuclear DNA.
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Affiliation(s)
- Fabian Dröge
- Institute of Physical Chemistry, Helmholtzweg 4, 07743 Jena, Germany; Institute of Photonic Technology Jena e.V., Albert-Einstein-Straße 9, 07749 Jena, Germany
| | | | | | | | | | | | | | | | | | | | | | - Jorge Bernardino de la Serna
- Central Laser Facility, Rutherford Appleton Laboratory, Research Complex at Harwell, Science and Technology Facilities Council, Harwell-Oxford, Didcot OX11 0QX, United Kingdom; National Heart and Lung Institute, Faculty of Medicine, Imperial College London, Sir Alexander Fleming Building, Exhibition Road, London SW7 2AZ, United Kingdom
| | - Benjamin Dietzek-Ivanšić
- Institute of Physical Chemistry, Helmholtzweg 4, 07743 Jena, Germany; Institute of Photonic Technology Jena e.V., Albert-Einstein-Straße 9, 07749 Jena, Germany
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4
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Chen Z, Kacmaz A, Xiao J. Recent Development in the Synthesis and Catalytic Application of Iridacycles. CHEM REC 2021; 21:1506-1534. [PMID: 33939250 DOI: 10.1002/tcr.202100051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 03/23/2021] [Accepted: 03/24/2021] [Indexed: 12/12/2022]
Abstract
Cyclometallated complexes are well-known and have found many applications. This article provides a short review on the progress made in the synthesis and application to catalysis of cyclometallated half-sandwich Cp*Ir(III) complexes (Cp*: pentamethylcyclopentadienyl) since 2017. Covered in the review are iridacycles featuring conventional C,N chelates and less common metallocene and carbene-derived C,N and C,C ligands. This is followed by an overview of the studies of their applications in catalysis ranging from asymmetric hydrogenation, transfer hydrogenation, hydrosilylation to dehydrogenation.
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Affiliation(s)
- Zhenyu Chen
- Department of Chemistry, University of Liverpool, Liverpool, L69 7ZD, UK
| | - Aysecik Kacmaz
- Department of Chemistry, University of Liverpool, Liverpool, L69 7ZD, UK.,Department of Chemistry, Faculty of Engineering, Istanbul University - Cerrahpasa, Avcilar, Istanbul, 34320, Turkey
| | - Jianliang Xiao
- Department of Chemistry, University of Liverpool, Liverpool, L69 7ZD, UK
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5
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Dkhar L, Sawkmie M, Ka-Ot AL, Joshi SR, Kaminsky W, Kollipara MR. Cp and indenyl ruthenium complexes containing dithione derivatives: Synthesis, antibacterial and antifungal study. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121418] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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6
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González I, Gómez J, Santander-Nelli M, Natali M, Cortés-Arriagada D, Dreyse P. Synthesis and photophysical characterization of novel Ir(III) complexes with a dipyridophenazine analogue (ppdh) as ancillary ligand. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114621] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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7
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Ru, Rh and Ir metal complexes of pyridyl chalcone derivatives: Their potent antibacterial activity, comparable cytotoxicity potency and selectivity to cisplatin. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114606] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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8
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Synthesis of half sandwich platinum group metal complexes containing pyridyl benzothiazole hydrazones: Study of bonding modes and antimicrobial activity. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121225] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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9
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Shadap L, Banothu V, Adepally U, Adhikari S, Kollipara MR. Variable structural bonding modes and antibacterial studies of thiosemicarbazone ligands of ruthenium, rhodium, and iridium metal complexes. J COORD CHEM 2020. [DOI: 10.1080/00958972.2019.1711070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Lathewdeipor Shadap
- Centre for Advanced Studies in Chemistry, North Eastern Hill University, Shillong, Meghalaya, India
| | - Venkanna Banothu
- Centre for Biotechnology (CBT), Institute of Science and Technology (IST), Jawaharlal Nehru Technological University Hyderabad (JNTUH), Hyderabad, Telangana, India
| | - Uma Adepally
- Centre for Biotechnology (CBT), Institute of Science and Technology (IST), Jawaharlal Nehru Technological University Hyderabad (JNTUH), Hyderabad, Telangana, India
| | - Sanjay Adhikari
- Centre for Advanced Studies in Chemistry, North Eastern Hill University, Shillong, Meghalaya, India
| | - Mohan Rao Kollipara
- Centre for Advanced Studies in Chemistry, North Eastern Hill University, Shillong, Meghalaya, India
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10
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Dkhar L, Kaminsky W, Poluri KM, Kollipara MR. Versatile coordination modes of benzothiazole hydrazone derivatives towards Ru(II), Rh(III) and Ir(III) complexes and their reactivity studies with azides and activated alkynes. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2019.04.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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11
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Wei F, Lai SL, Zhao S, Ng M, Chan MY, Yam VWW, Wong KMC. Ligand Mediated Luminescence Enhancement in Cyclometalated Rhodium(III) Complexes and Their Applications in Efficient Organic Light-Emitting Devices. J Am Chem Soc 2019; 141:12863-12871. [PMID: 31310721 DOI: 10.1021/jacs.9b06308] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A series of luminescent cyclometalated rhodium(III) complexes have been designed and prepared. The improved luminescence property is realized by the judicious choice of a strong σ-donor cyclometalating ligand with a lower-lying intraligand (IL) state that would raise the d-d excited state and introduction of a lower-lying emissive IL excited state. These complexes exhibit high thermal stability and considerable luminescence quantum yields as high as up to 0.65 in thin film, offering themselves as promising light-emitting materials in OLEDs. Respectable external quantum efficiencies of up to 12.2% and operational half-lifetimes of over 3000 h at 100 cd m-2 have been achieved. This work demonstrates a breakthrough as the first example of an efficient rhodium(III) emitter for OLED application and opens up a new avenue for diversifying the development of OLED materials with rhodium metal being utilized as phosphors.
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Affiliation(s)
- Fangfang Wei
- Department of Chemistry , Southern University of Science and Technology , 1088 Xueyuan Blvd. , Shenzhen 518055 , PR China
| | - Shiu-Lun Lai
- Institute of Molecular Functional Materials (Areas of Excellence Scheme, University Grants Committee, Hong Kong) and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , PR China
| | - Shunan Zhao
- Department of Chemistry , Southern University of Science and Technology , 1088 Xueyuan Blvd. , Shenzhen 518055 , PR China
| | - Maggie Ng
- Institute of Molecular Functional Materials (Areas of Excellence Scheme, University Grants Committee, Hong Kong) and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , PR China
| | - Mei-Yee Chan
- Institute of Molecular Functional Materials (Areas of Excellence Scheme, University Grants Committee, Hong Kong) and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , PR China
| | - Vivian Wing-Wah Yam
- Institute of Molecular Functional Materials (Areas of Excellence Scheme, University Grants Committee, Hong Kong) and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , PR China
| | - Keith Man-Chung Wong
- Department of Chemistry , Southern University of Science and Technology , 1088 Xueyuan Blvd. , Shenzhen 518055 , PR China
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12
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Similarities and differences in d 6 low-spin ruthenium, rhodium and iridium half-sandwich complexes: synthesis, structure, cytotoxicity and interaction with biological targets. J Biol Inorg Chem 2019; 24:591-606. [PMID: 31115765 PMCID: PMC6598960 DOI: 10.1007/s00775-019-01665-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Accepted: 05/08/2019] [Indexed: 11/27/2022]
Abstract
In this paper, we discussed the similarities and differences in d6 low-spin half-sandwich ruthenium, rhodium and iridium complexes containing 2,2′-biimidazole (H2biim). Three new complexes, {[RuCl(H2biim)(η6-p-cymene)]PF6}2·H2O (1), [(η5-Cp)RhCl(H2biim)]PF6 (2), and [(η5-Cp)IrCl(H2biim)]PF6 (3), were fully characterized by CHN, X-ray diffraction analysis, UV–Vis, FTIR, and 1H, 13C and 15N NMR spectroscopies. The complexes exhibit a typical pseudooctahedral piano-stool geometry, in which the aromatic arene ring (p-cymene or Cp) forms the seat, while the bidentate 2,2′-biimidazole and chloride ion form the three legs of the piano stool. Moreover, the cytotoxic activities of the compounds were examined in the LoVo, HL-60, MV-4-11, MCF-7 human cancer cell lines and BALB/3T3 normal mouse fibroblasts. Notably, the investigated complexes showed no cytotoxic effects towards the normal BALB/3T3 cell line compared to cisplatin, which has an IC50 value of 2.20 µg. Importantly, 1 displayed the highest activity against HL-60 (IC50 4.35 µg). To predict a binding mode, we explored the potential interactions of the metal complexes with CT-DNA and protein using UV absorption and circular dichroism. The obtained data suggest that the complexes could interact with CT-DNA via an outside binding mode. Moreover, binding of the complexes with the GSH via UV–Vis and ESI mass spectra was determined. Comparative studies have shown that the rhodium complex (2) is the most GSH reactive, which is probably responsible for its deactivation towards LoVo and MCF-7 tumour cells. The influence of the metal ion on the biological activity of isostructural Rh(III) and Ir(III) complexes was an important goal of the presented investigation.
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13
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Zou G, Zhao L, Zeng L, Luo K, Ni H, Wang H, Li Q, Yu W, Li X. Columnar Iridium(III) Metallomesogens Based on Polycatenar Pyridyltetrazolate with Ambipolar Carrier Mobility Behavior. Inorg Chem 2018; 58:861-869. [DOI: 10.1021/acs.inorgchem.8b02984] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Guo Zou
- College of Chemistry and Materials Science, Sichuan Normal University, 5 Jingan Road, Chengdu 610068, China
| | - Li Zhao
- College of Chemistry and Materials Science, Sichuan Normal University, 5 Jingan Road, Chengdu 610068, China
| | - Longwei Zeng
- College of Chemistry and Materials Science, Sichuan Normal University, 5 Jingan Road, Chengdu 610068, China
| | - Kaijun Luo
- College of Chemistry and Materials Science, Sichuan Normal University, 5 Jingan Road, Chengdu 610068, China
| | - Hailiang Ni
- College of Chemistry and Materials Science, Sichuan Normal University, 5 Jingan Road, Chengdu 610068, China
| | - Haifeng Wang
- College of Chemistry and Materials Science, Sichuan Normal University, 5 Jingan Road, Chengdu 610068, China
| | - Quan Li
- College of Chemistry and Materials Science, Sichuan Normal University, 5 Jingan Road, Chengdu 610068, China
| | - Wenhao Yu
- College of Chemistry and Materials Science, Sichuan Normal University, 5 Jingan Road, Chengdu 610068, China
| | - Xuelian Li
- College of Chemistry and Materials Science, Sichuan Normal University, 5 Jingan Road, Chengdu 610068, China
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14
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Nguyen TN, Ebrahim FM, Stylianou KC. Photoluminescent, upconversion luminescent and nonlinear optical metal-organic frameworks: From fundamental photophysics to potential applications. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2018.08.024] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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15
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Synthesis and structural characterization of arene d6 metal complexes of sulfonohydrazone and triazolo ligands: High potency of triazolo derivatives towards DNA binding. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.08.051] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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16
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Biabani M, Saravani H, Eigner V, Dusek M. A novel coordination polymer of Cd(II) based on 2-mercaptopyrimidine: Sonochemical synthesis, characterization, and antibacterial properties. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.04.054] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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17
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Aradhyula BPR, Kalidasan M, Gangele K, Deb DK, Shepherd SL, Phillips RM, Poluri KM, Kollipara MR. Synthesis, Structural and Biological Studies of Some Half-Sandwich d6-Metal Complexes with Pyrimidine-Based Ligands. ChemistrySelect 2017. [DOI: 10.1002/slct.201601926] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Mahesh Kalidasan
- Centre for Advanced Studies in Chemistry; North-Eastern Hill University; Shillong- 793 022 India
| | - Krishnakant Gangele
- Department of Biotechnology and Center for Nanotechnology; Indian Institute of Technology Roorkee; Roorkee- 247667, Uttarakhand India
| | - Debojit K. Deb
- Centre for Advanced Studies in Chemistry; North-Eastern Hill University; Shillong- 793 022 India
| | - Samanta L. Shepherd
- Department of Pharmacy; School of Applied Sciences; University of Huddersfield; Huddersfield - HD1 3DH UK
| | - Roger M. Phillips
- Department of Pharmacy; School of Applied Sciences; University of Huddersfield; Huddersfield - HD1 3DH UK
| | - Krishna Mohan Poluri
- Department of Biotechnology and Center for Nanotechnology; Indian Institute of Technology Roorkee; Roorkee- 247667, Uttarakhand India
| | - Mohan Rao Kollipara
- Centre for Advanced Studies in Chemistry; North-Eastern Hill University; Shillong- 793 022 India
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18
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Basava Punna Rao A, Uma A, Chiranjeevi T, Bethu M, Yashwanth B, Venkateswara Rao J, Poluri KM, Kollipara MR. Synthesis, structural and in vitro functional characterization of arene ruthenium complexes with 1,3,5-tris(di-2-pyridylaminomethyl)benzene ligand. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.08.031] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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19
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Ponce J, Aragó J, Vayá I, Magenti JG, Tatay S, Ortí E, Coronado E. Photophysical Properties of Oligo(phenylene ethynylene) Iridium(III) Complexes Functionalized with Metal-Anchoring Groups. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201501409] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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20
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Rao ABP, Palepu NR, Deb DK, Uma A, Chiranjeevi T, Sarkar B, Kaminsky W, Rao KM. Synthesis, structural, DFT studies and antibacterial evaluation of Cp∗ rhodium and Cp∗ iridium complexes using hydrazide based dipyridyl ketone ligand. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2015.12.035] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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21
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Aerobic Asymmetric Dehydrogenative Cross-Coupling between Two C sp 3H Groups Catalyzed by a Chiral-at-Metal Rhodium Complex. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201506273] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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22
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Tan Y, Yuan W, Gong L, Meggers E. Aerobic Asymmetric Dehydrogenative Cross‐Coupling between Two CH Groups Catalyzed by a Chiral‐at‐Metal Rhodium Complex. Angew Chem Int Ed Engl 2015; 54:13045-8. [DOI: 10.1002/anie.201506273] [Citation(s) in RCA: 124] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Indexed: 01/07/2023]
Affiliation(s)
- Yuqi Tan
- Key Laboratory for Chemical Biology of Fujian Province and Department of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005 (P.R. China)
| | - Wei Yuan
- Key Laboratory for Chemical Biology of Fujian Province and Department of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005 (P.R. China)
| | - Lei Gong
- Key Laboratory for Chemical Biology of Fujian Province and Department of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005 (P.R. China)
| | - Eric Meggers
- Key Laboratory for Chemical Biology of Fujian Province and Department of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005 (P.R. China)
- Fachbereich Chemie, Philipps‐Universität Marburg, Hans‐Meerwein‐Straße 4, 35043 Marburg (Germany)
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23
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Connell TU, James JL, White AR, Donnelly PS. Protein Labelling with Versatile Phosphorescent Metal Complexes for Live Cell Luminescence Imaging. Chemistry 2015; 21:14146-55. [PMID: 26264214 DOI: 10.1002/chem.201501630] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Indexed: 01/01/2023]
Abstract
To take advantage of the luminescent properties of d(6) transition metal complexes to label proteins, versatile bifunctional ligands were prepared. Ligands that contain a 1,2,3-triazole heterocycle were synthesised using Cu(I) catalysed azide-alkyne cycloaddition "click" chemistry and were used to form phosphorescent Ir(III) and Ru(II) complexes. Their emission properties were readily tuned, by changing either the metal ion or the co-ligands. The complexes were tethered to the metalloprotein transferrin using several conjugation strategies. The Ir(III)/Ru(II)-protein conjugates could be visualised in cancer cells using live cell imaging for extended periods without significant photobleaching. These versatile phosphorescent protein-labelling agents could be widely applied to other proteins and biomolecules and are useful alternatives to conventional organic fluorophores for several applications.
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Affiliation(s)
- Timothy U Connell
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Melbourne, Victoria 3010 (Australia)
| | - Janine L James
- Department of Pathology, The University of Melbourne, Melbourne, Victoria 3010 (Australia)
| | - Anthony R White
- Department of Pathology, The University of Melbourne, Melbourne, Victoria 3010 (Australia)
| | - Paul S Donnelly
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Melbourne, Victoria 3010 (Australia).
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Shiba Y, Inagaki A, Akita M. C–C Bond Forming Reductive Elimination from Diarylplatinum Complexes Driven by Visible-Light-Mediated Photoredox Reactions. Organometallics 2015. [DOI: 10.1021/om501080v] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Yuichiro Shiba
- Chemical Resources Laboratory, Tokyo Institute of Technology, R1-27, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Akiko Inagaki
- Department
of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, Minami-Osawa 1-1, Hachioji, Tokyo 192-0397, Japan
| | - Munetaka Akita
- Chemical Resources Laboratory, Tokyo Institute of Technology, R1-27, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
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25
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González I, Dreyse P, Cortés-Arriagada D, Sundararajan M, Morgado C, Brito I, Roldán-Carmona C, Bolink HJ, Loeb B. A comparative study of Ir(iii) complexes with pyrazino[2,3-f][1,10]phenanthroline and pyrazino[2,3-f][4,7]phenanthroline ligands in light-emitting electrochemical cells (LECs). Dalton Trans 2015. [DOI: 10.1039/c5dt01385b] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Two new cationic Ir(iii) complexes are compared with respect to their performance in light electrochemical cells (LECs).
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Affiliation(s)
- Iván González
- Departamento de Química Inorgánica
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago
- Chile
| | - Paulina Dreyse
- Departamento de Química
- Universidad Técnica Federico Santa María
- Valparaíso
- Chile
| | - Diego Cortés-Arriagada
- Nucleus Millennium Chemical Processes and Catalysis
- Laboratorio de Química Teórica Computacional(QTC)
- Departamento de Química-Teórica
- Facultad de Química
- Pontificia Universidad Católica de Chile
| | - Mahesh Sundararajan
- Theoretical Chemistry Section
- Bhabha Atomic Research Centre
- Mumbai – 400 085
- India
| | - Claudio Morgado
- Departamento de Química
- Universidad Técnica Federico Santa María
- Valparaíso
- Chile
| | - Iván Brito
- Departamento de Química
- Facultad de Ciencias Básicas
- Universidad de Antofagasta
- Antofagasta
- Chile
| | | | - Henk J. Bolink
- Instituto de Ciencia Molecular
- Universidad de Valencia
- 46980 Paterna
- Spain
| | - Bárbara Loeb
- Departamento de Química Inorgánica
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago
- Chile
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26
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Li C, Wang S, Huang Y, Wen Q, Wang L, Kan Y. Photoluminescence properties of a novel cyclometalated iridium(III) complex with coumarin-boronate and its recognition of hydrogen peroxide. Dalton Trans 2014; 43:5595-602. [PMID: 24549180 DOI: 10.1039/c3dt53498g] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
A novel neutral iridium(III) complex-based phosphorescent probe (Ir-2) for hydrogen peroxide (H2O2) has been designed and synthesized by incorporating a benzeneboronic acid pinacol ester (bpe) moiety into 3-(benzothiazol-2-yl)-7-hydroxy-coumarin (Bthc) as a cyclometalated ligand (Bthc-bpe). The photophysical behavior of Ir-2 was investigated by UV-Vis absorption spectroscopy, photoluminescence spectroscopy, and quantum mechanical calculations. The absorption spectra of the complex Ir-2 are dominated by the cyclometalated ligand; thus it shows an intense absorption band in the visible region at 460 nm with a molar extinction coefficient (ε) of about 3 × 10(4) M(-1) cm(-1), which is rarely found for typical polypyridine iridium(III) complexes. The complex Ir-2 displays efficient phosphorescent emission at 560 nm at room temperature originating from a mixed triplet metal-to-ligand charge-transfer ((3)MLCT, dπ(Ir) → π* (Bthc-bpe)) and triplet intraligand ((3)ILCT, π-π* (Bthc-bpe)) excited states as suggested by the DFT computational studies. Upon reaction with H2O2, the complex displays an emission decrease induced by an intense intermolecular aggregation due to the cleavage of the bulky benzeneboronic acid pinacol ester substituent, indicating that Ir-2 could act as an ON-OFF-type phosphorescent probe for H2O2. Additionally, selectivity studies reveal that the complex Ir-2 possesses high selectivity toward H2O2 over other reactive oxygen species (ROS).
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Affiliation(s)
- Chunxiang Li
- Key Laboratory of Sensor Analysis of Tumor Marker, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China.
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Steffen A, Ward RM, Tay MG, Edkins RM, Seeler F, van Leeuwen M, Pålsson LO, Beeby A, Batsanov AS, Howard JAK, Marder TB. Regiospecific Formation and Unusual Optical Properties of 2,5-Bis(arylethynyl)rhodacyclopentadienes: A New Class of Luminescent Organometallics. Chemistry 2014; 20:3652-66. [DOI: 10.1002/chem.201304068] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Indexed: 11/11/2022]
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Ladouceur S, Zysman-Colman E. A Comprehensive Survey of Cationic Iridium(III) Complexes Bearing Nontraditional Ligand Chelation Motifs. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300171] [Citation(s) in RCA: 150] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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29
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Ramlot D, Rebarz M, Volker L, Ovaere M, Beljonne D, Dehaen W, Van Meervelt L, Moucheron C, Kirsch-De Mesmaeker A. An Experimental and Theoretical Approach to the Photophysical Properties of Some Rh and Ir Complexes Incorporating the Dipyrromethene Ligand. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201201427] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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30
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NONGBRI SAPHIDABHAL, DAS BABULAL, KOLLIPARA MOHANRAO. Study of $\boldsymbol{\eta}^{\bf 6}$ - cyclic $\boldsymbol{\pi} $ -perimeter hydrocarbon ruthenium complexes bearing functionalized pyridyl diketones: Isolation of complexes with $\boldsymbol{\kappa}^\textbf{2}$ -N∩O and $\boldsymbol{\kappa}^\textbf{4}$ -N∩O bonding modes of ligands. J CHEM SCI 2013. [DOI: 10.1007/s12039-012-0337-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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31
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Ladouceur S, Donato L, Romain M, Mudraboyina BP, Johansen MB, Wisner JA, Zysman-Colman E. A rare case of dual emission in a neutral heteroleptic iridium(iii) complex. Dalton Trans 2013; 42:8838-47. [DOI: 10.1039/c3dt33115f] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Li SPY, Tang TSM, Yiu KSM, Lo KKW. Cyclometalated Iridium(III)-Polyamine Complexes with Intense and Long-Lived Multicolor Phosphorescence: Synthesis, Crystal Structure, Photophysical Behavior, Cellular Uptake, and Transfection Properties. Chemistry 2012; 18:13342-54. [DOI: 10.1002/chem.201200979] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2012] [Indexed: 12/17/2022]
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33
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Nongbri SL, Das B, Rao KM. Isolation and spectral studies of water-solubleη5-cyclichydrocarbon rhodium and iridium complexes with pyridyl diketone analogues bonded throughκ2-N∩O,κ4–N∩O, andκ3-N-C-N modes. J COORD CHEM 2012. [DOI: 10.1080/00958972.2012.664638] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Saphidabha L. Nongbri
- a Department of Chemistry , North Eastern Hill University , Shillong 793 022 , Meghalaya , India
| | - Babulal Das
- b Department of Chemistry , Indian Institute of Technology , Guwahati , Assam , India
| | - Kollipara Mohan Rao
- a Department of Chemistry , North Eastern Hill University , Shillong 793 022 , Meghalaya , India
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Moriuchi T, Mao L, Wu HL, Ohmura SD, Watanabe M, Hirao T. Synthesis of facial cyclometalated iridium(iii) complexes triggered by tripodal ligands. Dalton Trans 2012; 41:9519-25. [DOI: 10.1039/c2dt12309f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Lo KKW, Zhang KY. Iridium(iii) complexes as therapeutic and bioimaging reagents for cellular applications. RSC Adv 2012. [DOI: 10.1039/c2ra20967e] [Citation(s) in RCA: 185] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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36
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Jones JE, Jenkins RL, Hicks RS, Hallett AJ, Pope SJA. Water-soluble, luminescent iridium(iii)–ytterbium(iii) complexes using dipyrido[3,2-a:2′,3′-c]phenazine derivatives as bridging units. Dalton Trans 2012; 41:10372-81. [DOI: 10.1039/c2dt31115a] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Bio-catalysts and catalysts based on ruthenium(II) polypyridyl complexes imparting diphenyl-(2-pyridyl)-phosphine as a co-ligand. J Organomet Chem 2011. [DOI: 10.1016/j.jorganchem.2011.06.031] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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38
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Kiran RV, Hogan CF, James BD, Wilson DJD. Photophysical and Electrochemical Properties of Phenanthroline-Based Bis-cyclometallated Iridium Complexes in Aqueous and Organic Media. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100639] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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39
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Spaenig F, Olivier JH, Prusakova V, Retailleau P, Ziessel R, Castellano FN. Excited-state properties of heteroleptic iridium(III) complexes bearing aromatic hydrocarbons with extended cores. Inorg Chem 2011; 50:10859-71. [PMID: 21888383 DOI: 10.1021/ic201397v] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The synthesis, complete structural characterization, electrochemistry, and excited-state dynamics of a series of four bis-heteroleptic iridium(III) charge-transfer complexes composed of a single acac-functionalized and two ortho-metalated 2-phenylpyridine ligands. The formed iodophenyl complex (2) was used as a metallosynthon to introduce extended-core ethynyltolyl (3), ethynylpyrene (4), and ethynylperylene (5) residues into these structures projecting from the acac ancillary ligand. Static and dynamic photoluminescence along with ultrafast and conventional transient absorption measurements in conjunction with cyclic voltammetry were employed to elucidate the nature of the intramolecular energy-transfer processes occurring in the excited states of polychromophores 4 and 5 and are directly compared with those of model complexes 2 and 3. Upon charge-transfer excitation of these molecules, the long-lived triplet-state metal-to-ligand charge-transfer ((3)MLCT)-based photoluminescence readily observed in 2 and 3 (τ = 1 μs) is nearly quantitatively quenched, resulting from production of the associated triplet intraligand ((3)IL) excited states in 4 and 5 through intramolecular triplet-triplet energy transfer. The respective formation of the extended-core (3)*pyrenyl and (3)*perylenyl-localized excited states in 4 and 5 is confirmed by their ultrafast excited-state evolution, which ultimately generates features associated with these (3)IL excited states and their greatly extended excited-state lifetimes with respect to the parent complexes 2 and 3.
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Affiliation(s)
- Fabian Spaenig
- Department of Chemistry and Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403, USA
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Lee PK, Law WHT, Liu HW, Lo KKW. Luminescent Cyclometalated Iridium(III) Polypyridine Di-2-picolylamine Complexes: Synthesis, Photophysics, Electrochemistry, Cation Binding, Cellular Internalization, and Cytotoxic Activity. Inorg Chem 2011; 50:8570-9. [DOI: 10.1021/ic201153d] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Pui-Kei Lee
- Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People’s Republic of China
| | - Wendell Ho-Tin Law
- Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People’s Republic of China
| | - Hua-Wei Liu
- Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People’s Republic of China
| | - Kenneth Kam-Wing Lo
- Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People’s Republic of China
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41
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Wu Y, Jing H, Dong Z, Zhao Q, Wu H, Li F. Ratiometric Phosphorescence Imaging of Hg(II) in Living Cells Based on a Neutral Iridium(III) Complex. Inorg Chem 2011; 50:7412-20. [DOI: 10.1021/ic102082k] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Yongquan Wu
- Department of Chemistry, Fudan University, Shanghai, 200433, P. R. China
| | - Hao Jing
- Department of Chemistry, Fudan University, Shanghai, 200433, P. R. China
| | - Zesheng Dong
- Department of Chemistry, Fudan University, Shanghai, 200433, P. R. China
| | - Qiang Zhao
- Key Laboratory for Organic Electronics & Information Displays (KLOEID) and Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing 210046, P. R. China
| | - Huazhou Wu
- Department of Chemistry, Fudan University, Shanghai, 200433, P. R. China
| | - Fuyou Li
- Department of Chemistry, Fudan University, Shanghai, 200433, P. R. China
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42
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Gupta G, Park S, Lee S, Kim J. Syntheses and Molecular Structure of Dinuclear Transition Metal Complexes Bridged by Dipyridylamine Derivative Ligands. Z Anorg Allg Chem 2011. [DOI: 10.1002/zaac.201100163] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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43
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Dumur F, Guillaneuf Y, Guerlin A, Wantz G, Bertin D, Miomandre F, Clavier G, Gigmes D, Mayer CR. Random Copolymers with Pendant Cationic Mixed-Ligand Terpyridine-Based Iridium (III) Complexes: Synthesis and Application in Light-Emitting Devices. MACROMOL CHEM PHYS 2011. [DOI: 10.1002/macp.201100167] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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44
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Gupta G, Gloria S, Therrien B, Das B, Mohan Rao K. Study of half sandwich platinum group metal complexes containing tetradentate N-donor ligand bearing two di-pyridylamine units linked by an aromatic spacer. J Organomet Chem 2011. [DOI: 10.1016/j.jorganchem.2010.09.060] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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45
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Lo KKW, Li SPY, Zhang KY. Development of luminescent iridium(iii) polypyridine complexes as chemical and biological probes. NEW J CHEM 2011. [DOI: 10.1039/c0nj00478b] [Citation(s) in RCA: 195] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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46
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Luminescent cyclometalated iridium(III) dipyridoquinoxaline indole complexes as biological probes. Sci China Chem 2010. [DOI: 10.1007/s11426-010-4120-y] [Citation(s) in RCA: 4] [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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47
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Synthesis, properties, and live-cell imaging studies of luminescent cyclometalated iridium(III) polypyridine complexes containing two or three biotin pendants. Inorg Chem 2010; 48:6011-25. [PMID: 19480459 DOI: 10.1021/ic900412n] [Citation(s) in RCA: 139] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Three luminescent cyclometalated iridium(III) bis-biotin complexes [Ir(N(wedge)C)(2)(N(wedge)N)](PF(6)) (HN(wedge)C = 2-(4-(N-(6-(biotinamido)hexyl)aminomethyl)phenyl)pyridine, HppyC6B, N(wedge)N = 2,2'-bipyridine, bpy (1); HN(wedge)C = 2-phenylpyridine, Hppy, N(wedge)N = 4,4'-bis((2-(biotinamido)ethyl)aminocarbonyl)-2,2'-bipyridine, bpyC2B2 (2); HN(wedge)C = Hppy, N(wedge)N = 4,4'-bis((2-((6-(biotinamido)hexanoyl)amino)ethyl)aminocarbonyl)-2,2'-bipyridine, bpyC2C6B2 (3)) and one tris-biotin complex [Ir(ppyC6B)(2)(bpyC6B)](PF(6)) (bpyC6B = 4-((6-(biotinamido)hexyl)aminocarbonyl)-4'-methyl-2,2'-bipyridine) (4) have been synthesized and characterized. The biotin-free complex [Ir(ppy)(2)(bpyC4)](PF(6)) (bpyC4 = 4,4'-bis(n-butylaminocarbonyl)-2,2'-bipyridine) (5) has also been prepared for comparison studies. Upon photoexcitation, all the complexes displayed intense and long-lived greenish-yellow to red triplet metal-to-ligand charge-transfer ((3)MLCT) (dpi (Ir) --> pi*(N(wedge)N)) emission in fluid solutions at room temperature and in low-temperature glass. Cyclic voltammetric studies revealed iridium(IV/III) oxidation at about +1.21 to + 1.29 V and diimine-based reductions at about -1.07 to -1.39 V versus SCE. The interactions of the bis-biotin and tris-biotin complexes with avidin have been studied by 4'-hydroxyazobenzene-2-carboxylic acid (HABA) assays, emission titrations, and dissociation assays. The possibility of these complexes as cross-linkers for avidin has been examined by microscopy studies using avidin-conjugated green fluororescent microspheres and size-exclusion HPLC analysis. Utilization of these luminescent iridium(III) biotin complexes in signal amplification has been demonstrated using avidin-coated nonfluorescent microspheres and complex 3 as an example. Additionally, the lipophilicity of all the complexes has been determined by reversed-phase HPLC. The cytotoxicity of these iridium(III) complexes toward the human cervix epithelioid carcinoma (HeLa) cell line has been evaluated by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyltetrazolium bromide (MTT) assays. Furthermore, the cellular uptake of the complexes has been examined by ICP-MS, laser-scanning confocal microscopy, and flow cytometry.
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48
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Lee PK, Liu HW, Yiu SM, Louie MW, Lo KKW. Luminescent cyclometallated iridium(III) bis(quinolylbenzaldehyde) diimine complexes--synthesis, photophysics, electrochemistry, protein cross-linking properties, cytotoxicity and cellular uptake. Dalton Trans 2010; 40:2180-9. [PMID: 20717588 DOI: 10.1039/c0dt00501k] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Four new luminescent cyclometallated iridium(III) bis(quinolylbenzaldehyde) diimine complexes [Ir(qba)(2)(N⁁N)](PF(6)) (Hqba = 4-(2-quinolyl)benzaldehyde, N⁁N = 2,2'-bipyridine, bpy (1); 1,10-phenanthroline, phen (2); 3,4,7,8-tetramethyl-1,10-phenanthroline, Me(4)-phen (3); 4,7-diphenyl-1,10-phenanthroline, Ph(2)-phen (4)) have been synthesised and characterised, and their electronic absorption, emission and electrochemical properties investigated. The X-ray crystal structures of complexes 1 and 2 have been determined. Upon irradiation, complexes 1-4 exhibited intense and long-lived orange-yellow emission in fluid solutions at 298 K and in alcohol glass at 77 K. The emission has been assigned to a triplet intra-ligand ((3)IL) excited state associated with the qba ligand, probably with mixing of some triplet metal-to-ligand charge-transfer ((3)MLCT) (dπ(Ir) →π*(qba)) character. Reductive amination reactions of complexes 1-4 with the protein bovine serum albumin (BSA) afforded the bioconjugates 1-BSA-4-BSA, respectively. Upon photoexcitation, these bioconjugates displayed intense and long-lived (3)MLCT (dπ(Ir) →π*(N⁁C)) emission in aqueous buffer at 298 K. The cross-linked nature of the Ir-BSA bioconjugates has been verified by SDS-PAGE. Additionally, the cytotoxicity of the complexes towards human cervix epithelioid carcinoma (HeLa) cells has been examined by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyltetrazolium bromide (MTT) assays, and the cellular uptake of complex 4 has been investigated by laser-scanning confocal microscopy and flow cytometry.
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Affiliation(s)
- Pui-Kei Lee
- Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong, People's Republic of China
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Li SY, Liu HW, Zhang K, Lo KW. Modification of Luminescent Iridium(III) Polypyridine Complexes with Discrete Poly(ethylene glycol) (PEG) Pendants: Synthesis, Emissive Behavior, Intracellular Uptake, and PEGylation Properties. Chemistry 2010; 16:8329-39. [DOI: 10.1002/chem.201000474] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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50
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Ladouceur S, Fortin D, Zysman-Colman E. Role of Substitution on the Photophysical Properties of 5,5′-Diaryl-2,2′-bipyridine (bpy*) in [Ir(ppy)2(bpy*)]PF6 Complexes: A Combined Experimental and Theoretical Study. Inorg Chem 2010; 49:5625-41. [DOI: 10.1021/ic100521t] [Citation(s) in RCA: 144] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Sébastien Ladouceur
- Département de chimie, Université de Sherbrooke, 2500 Boul. Université, Sherbooke, Quebec, Canada J1K 2R1
| | - Daniel Fortin
- Département de chimie, Université de Sherbrooke, 2500 Boul. Université, Sherbooke, Quebec, Canada J1K 2R1
| | - Eli Zysman-Colman
- Département de chimie, Université de Sherbrooke, 2500 Boul. Université, Sherbooke, Quebec, Canada J1K 2R1
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