1
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Alsaeedi MS. Deep-blue light-emitting cationic iridium(III) complexes featuring diamine ancillary ligands: Experimental and theoretical investigations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 310:123935. [PMID: 38295588 DOI: 10.1016/j.saa.2024.123935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 12/22/2023] [Accepted: 01/20/2024] [Indexed: 02/02/2024]
Abstract
Deep-blue emitters based on combining two approaches are reported here. In the first approach, the nitrogen content of the cyclometallated ligand is increased using 2,4'-bpy ligands, leading to a low highest occupied molecular orbital energy. In the second approach, 2,2'-bpy is replaced with a lower electron donating ligand, leading to a high lowest unoccupied molecular orbital (LUMO) energy. Thus, three new ionic transition metal complexes of [Ir(2,4'-bpy)2(NN)]PF6 [where NN is 2,2'-bpy (1), o-phenylenediamine (2), and 4-methoxy-o-phenylenediamine (3)] were synthesized, and their electronic and photophysical features were studied. In solution, [Ir(2,4'-bpy)2bpy]PF6 emits blue light centered at 396 nm, which is blue-shifted compared to [Ir(ppy)2bpy]PF6. The low electron donation of the diamine ancillary ligands introduces the contribution of the cyclometallated ligand to the LUMO, changing the nature of the emission and leading to different photophysical features. Density functional theory calculations indicate the long bond distances of Ir-Ns at the diamine ligands, suggesting weak metal-ligand interactions and low quantum yields.1.
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Affiliation(s)
- Mona Sunaydih Alsaeedi
- Department of Chemistry, College of Science, Taif University, Al-Haweiah, P.O. Box 11099, Taif 21944, Saudi Arabia.
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2
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Wang Y, Huang Y, Chen S, Gao J, Zhang Y, Duan YC, Deng P. Construction of Robust Iridium(III) Complex-Based Photosensitizer for Boosting Hydrogen Evolution. Inorg Chem 2023; 62:7212-7219. [PMID: 37139601 DOI: 10.1021/acs.inorgchem.2c04471] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Developing a photosensitizer with high efficiency and long-term stability for photocatalytic hydrogen evolution is highly desirable yet remains a challenge. Herein, a novel Ir(III) complex-based photosensitizer (Ir3) bearing coumarin and triphenylamine groups is designed. Ir3 exhibits record activity and durability among reported transition metal complexes for photocatalytic hydrogen evolution, with a TON of 198,363 and a duration of 214 h. The excellent photocatalytic performance of Ir3 can be attributed to the synergistic effect of coumarin and triphenylamine, which improves the visible light absorption, charge separation, and electron transfer capacity of photosensitizers. This is an efficient and long-lived Ir(III) photosensitizer constructed on the basis of a synergistic approach, which could provide a new insight for the development of high-performance Ir(III) photosensitizers at the molecular level.
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Affiliation(s)
- Yue Wang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China
| | - Yifan Huang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China
| | - Shuang Chen
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China
| | - Jian Gao
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Yifan Zhang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Ying-Chen Duan
- School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, 7989 Weixing Road, Changchun 130022, China
| | - Pengyang Deng
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China
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3
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Owen Bonello R, Pitak MB, Tizzard GJ, Coles SJ, Fallis IA, Pope SJ. Aryl, bi-functionalised imidazo[4,5-f]-1,10-phenanthroline ligands and their luminescent rhenium(I) complexes. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.116179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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4
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Liu D, Imran M, Xiao X, Zhao J. Spiro rhodamine-coumarin compact electron donor-acceptor dyads: synthesis and spin-orbit charge transfer intersystem crossing. PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES : OFFICIAL JOURNAL OF THE EUROPEAN PHOTOCHEMISTRY ASSOCIATION AND THE EUROPEAN SOCIETY FOR PHOTOBIOLOGY 2022; 21:2153-2168. [PMID: 35984632 DOI: 10.1007/s43630-022-00285-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 08/08/2022] [Indexed: 11/30/2022]
Abstract
We prepared spiro rhodamine (RB)-coumarin (Cou) compact electron donor-acceptor dyads (RB-Cou-CF3 and RB-Cou-CN), to study the charge transfer (CT) and spin-orbit CT intersystem crossing (SOCT-ISC). The π-conjugation planes of the rhodamine and coumarin units in both dyads are in nearly orthogonal geometry (dihedral angle: 86.3°). CT state emission was observed for RB-Cou-CF3 (at 550 nm) and RB-Cou-CN (at 595 nm). Although the fluorescence of the pristine coumarin units (fluorescence quantum yields ΦF = 59%) was quenched in the dyads (ΦF = 0.5 ~ 1.1% in n-hexane), the triplet state quantum yields of the dyads are also low (singlet oxygen quantum yield, ΦΔ = 2.3-7.5% in n-hexane). Nanosecond transient absorption spectra show that the 3Cou* state was formed, which shows a triplet state lifetime of 11-15.6 μs. The proposed photophysical path for the dyads is as follows: RB-1Cou* → RB+•-Cou-• → RB-3Cou*. The low SOCT-ISC yield is attributed to the slightly lower charge-transfer state energy (1.94 eV in toluene) as compared to the 3Cou* state energy (2.23 eV) and the shallow potential energy curve (PEC) at energy minima of the dyads. This work indicates that orthogonal conformation of donor-acceptor units is inadequate for achieving efficient SOCT-ISC. These results are useful for studying charge separation and intersystem crossing of electron donor/acceptor dyads.
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Affiliation(s)
- Dongyi Liu
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Ling Gong Road, Dalian, 116024, People's Republic of China
| | - Muhammad Imran
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Ling Gong Road, Dalian, 116024, People's Republic of China
| | - Xiao Xiao
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Ling Gong Road, Dalian, 116024, People's Republic of China
| | - Jianzhang Zhao
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Ling Gong Road, Dalian, 116024, People's Republic of China.
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5
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Wu Y, Sutton GD, Halamicek MDS, Xing X, Bao J, Teets TS. Cyclometalated iridium-coumarin ratiometric oxygen sensors: improved signal resolution and tunable dynamic ranges. Chem Sci 2022; 13:8804-8812. [PMID: 35975154 PMCID: PMC9350586 DOI: 10.1039/d2sc02909j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Accepted: 06/21/2022] [Indexed: 12/31/2022] Open
Abstract
In this work we introduce a new series of ratiometric oxygen sensors based on phosphorescent cyclometalated iridium centers partnered with organic coumarin fluorophores. Three different cyclometalating ligands and two different pyridyl-containing coumarin types were used to prepare six target complexes with tunable excited-state energies. Three of the complexes display dual emission, with fluorescence arising from the coumarin ligand, and phosphorescence from either the cyclometalated iridium center or the coumarin. These dual-emitting complexes function as ratiometric oxygen sensors, with the phosphorescence quenched under O2 while fluorescence is unaffected. The use of blue-fluorescent coumarins results in good signal resolution between fluorescence and phosphorescence. Moreover, the sensitivity and dynamic range, measured with Stern-Volmer analysis, can be tuned two orders of magnitude by virtue of our ability to synthetically control the triplet excited-state ordering. The complex with cyclometalated iridium 3MLCT phosphorescence operates under hyperoxic conditions, whereas the two complexes with coumarin-centered phosphorescence are sensitive to very low levels of O2 and function as hypoxic sensors.
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Affiliation(s)
- Yanyu Wu
- University of Houston, Department of Chemistry 3585 Cullen Blvd., Room 112 Houston TX 77204-5003 USA
| | - Gregory D Sutton
- University of Houston, Department of Chemistry 3585 Cullen Blvd., Room 112 Houston TX 77204-5003 USA
| | - Michael D S Halamicek
- University of Houston, Department of Chemistry 3585 Cullen Blvd., Room 112 Houston TX 77204-5003 USA
| | - Xinxin Xing
- University of Houston, Department of Electrical and Computer Engineering and Texas Center for Superconductivity (TcSUH) Houston TX 77204 USA
| | - Jiming Bao
- University of Houston, Department of Electrical and Computer Engineering and Texas Center for Superconductivity (TcSUH) Houston TX 77204 USA
| | - Thomas S Teets
- University of Houston, Department of Chemistry 3585 Cullen Blvd., Room 112 Houston TX 77204-5003 USA
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6
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Ahmad W, Wang J, Li H, Ouyang Q, Wu W, Chen Q. Strategies for combining triplet–triplet annihilation upconversion sensitizers and acceptors in a host matrix. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.213944] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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7
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Two Excited State Collaboration of Heteroleptic Ir(III)-Coumarin Complexes for H2 Evolution Dye-Sensitized Photocatalysts. ENERGIES 2021. [DOI: 10.3390/en14092425] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Interfacial electron injection from a photoexcited surface-immobilized dye to a semiconductor substrate is a key reaction for dye-sensitized photocatalysts. We previously reported that the molecular orientation of heteroleptic Ir(III) photosensitizer on the TiO2 nanoparticle surface was important for efficient interfacial electron injection. In this work, to overcome the weak light absorption ability of heteroleptic Ir(III) photosensitizer and to improve the photoinduced charge-separation efficiency at the dye–semiconductor interface, we synthesized two heteroleptic Ir(III) complexes with different coumarin dyes, [Ir(C6)2(H4CPbpy)]Cl and [Ir(C30)2(H4CPbpy)]Cl [Ir-CX; X = 6 or 30; HC6 = 3-(2-enzothiazolyl)-7-(diethylamino)coumarin, HC30 = 3-(2-N-methylbenzimidazolyl)-7-N,N-diethylaminocoumarin, H4CPbpy = 4,4′-bis(methylphosphonic acid)-2,2′-bipyridine], as the cyclometalated ligands and immobilized them on the surface of Pt-cocatalyst-loaded TiO2 nanoparticles. Ultraviolet-visible absorption and emission spectroscopy revealed that the singlet ligand-centered (1LC) absorption and triplet 3LC emission bands of Ir-C30 occurred at shorter wavelengths than those of Ir-C6, while time-dependent density-functional-theory data suggested that the ligand-to-ligand charge transfer (LLCT) excited states of the two complexes were comparable. The photocatalytic H2 evolution activity of the Ir-C6-sensitized Pt-TiO2 nanoparticles (Ir-C6@Pt-TiO2) under visible light irradiation (λ > 420 nm) was higher than that of Ir-C30@Pt-TiO2. In contrast, their activities were comparable under irradiation with monochromatic light (λ = 450 ± 10 nm), which is absorbed comparably by both Ir-CX complexes. These results suggest that the internal conversion from the higher-lying LC state to the LLCT state effectively occurs in both Ir-CX complexes to trigger electron injection to TiO2.
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8
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Monti F, Baschieri A, Sambri L, Armaroli N. Excited-State Engineering in Heteroleptic Ionic Iridium(III) Complexes. Acc Chem Res 2021; 54:1492-1505. [PMID: 33617233 PMCID: PMC9292135 DOI: 10.1021/acs.accounts.0c00825] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
![]()
Iridium(III)
complexes have assumed a prominent role in the areas
of photochemistry and photophysics due to the peculiar properties
of both the metal itself and the ligand environment that can be assembled
around it. Ir(III) is larger, heavier, and bears a higher ionic charge
than its analogue and widely used d6 ions such as Fe(II)
and Ru(II). Accordingly, its complexes exhibit wider ligand-field
d–d orbital splitting with electronic levels centered on the
metal, typically nonemissive and photodissociative, not playing a
relevant role in excited-state deactivations. In other words, iridium
complexes are typically more stable and/or more emissive than Fe(II)
and Ru(II) systems. Additionally, the particularly strong heavy-atom
effect of iridium promotes singlet–triplet transitions, with
characteristic absorption features in the UV–vis and relatively
short excited-state lifetimes of emissive triplet levels. Ir(III)
is also a platform for anchoring ligands of rather different sorts.
Its versatile chemistry includes not only coordination with classic
N∧N neutral ligands but also the binding of negatively
charged chelators, typically having a cyclometalating C∧N anchor. The carbon–metal bond in these systems has some
degree of covalent character, but this does not preclude a localized
description of the excited states of the related complexes, which
can be designated as metal-centered (MC), ligand-centered (LC), or
charge transfer (CT), allowing a simplified description of electronic
and photophysical properties. The possibility of binding different
types of ligands and making heteroleptic complexes is a formidable
tool for finely tuning the nature and energy of the lowest electronic
excited state of cationic Ir(III) complexes by ligand design. Herein
we give an account of our work on several families of iridium complexes
typically equipped with two cyclometalating bidentate ligands (C∧N), in combination with mono or bidentate “ancillary”
ligands with N∧N, C∧N, and C∧C motifs. We have explored new synthesis routes for
both cyclometalating and ancillary ligands, obtaining primarily cationic
complexes but also some neutral or even negatively charged systems.
In the domain of the ancillary ligands, we have explored isocyanides,
carbenes, mesoionic triazolylidenes, and bis-tetrazolic ligands. For
the cyclometalating moiety, we have investigated carbene, mesoionic
triazolylidene, and tetrazolic systems. Key results of our work include
new strategies to modify both cyclometalating and ancillary ligands
by relocating ionic charges, the determination of new factors affecting
the stability of complexes, a demonstration of subtle structural effects
that strongly modify the photophysical properties, new options to
get blue-greenish emitters for optoelectronic devices, and a set of
ligand modifications allowing the optimization of electrochemical
and excited-state properties to obtain new promising Ir(III) complexes
for photoredox catalysis. These results constitute a step forward
in the preparation of custom iridium-based materials crafted by excited-state
engineering, which is achieved through the concerted effort of computational
and synthetic chemistry along with electrochemistry and photochemistry.
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Affiliation(s)
- Filippo Monti
- Istituto per la Sintesi Organica e la Fotoreattività, Consiglio Nazionale delle Ricerche (ISOF-CNR), Via P. Gobetti 101, 40129 Bologna, Italy
| | - Andrea Baschieri
- Istituto per la Sintesi Organica e la Fotoreattività, Consiglio Nazionale delle Ricerche (ISOF-CNR), Via P. Gobetti 101, 40129 Bologna, Italy
| | - Letizia Sambri
- Dipartimento di Chimica Industriale “Toso Montanari”, Università di Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
| | - Nicola Armaroli
- Istituto per la Sintesi Organica e la Fotoreattività, Consiglio Nazionale delle Ricerche (ISOF-CNR), Via P. Gobetti 101, 40129 Bologna, Italy
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9
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Elgar CE, Otaif HY, Zhang X, Zhao J, Horton PN, Coles SJ, Beames JM, Pope SJA. Iridium(III) Sensitisers and Energy Upconversion: The Influence of Ligand Structure upon TTA-UC Performance. Chemistry 2021; 27:3427-3439. [PMID: 33242225 DOI: 10.1002/chem.202004146] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 10/20/2020] [Indexed: 12/21/2022]
Abstract
Six substituted ligands based upon 2-(naphthalen-1-yl)quinoline-4-carboxylate and 2-(naphthalen-2-yl)quinoline-4-carboxylate have been synthesised in two steps from a range of commercially available isatin derivatives. These species are shown to be effective cyclometallating ligands for IrIII , yielding complexes of the form [Ir(C^N)2 (bipy)]PF6 (where C^N=cyclometallating ligand; bipy=2,2'-bipyridine). X-ray crystallographic studies on three examples demonstrate that the complexes adopt a distorted octahedral geometry wherein a cis-C,C and trans-N,N coordination mode is observed. Intraligand torsional distortions are evident in all cases. The IrIII complexes display photoluminescence in the red part of the visible region (668-693 nm), which is modestly tuneable through the ligand structure. The triplet lifetimes of the complexes are clearly influenced by the precise structure of the ligand in each case. Supporting computational (DFT) studies suggest that the differences in observed triplet lifetime are likely due to differing admixtures of ligand-centred versus MLCT character instilled by the facets of the ligand structure. Triplet-triplet annihilation upconversion (TTA-UC) measurements demonstrate that the complexes based upon the 1-naphthyl derived ligands are viable photosensitisers with upconversion quantum efficiencies of 1.6-6.7 %.
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Affiliation(s)
- Christopher E Elgar
- School of Chemistry, Cardiff University, Main Building, Cardiff, CF10 3AT, Cymru/Wales, UK
| | - Haleema Y Otaif
- School of Chemistry, Cardiff University, Main Building, Cardiff, CF10 3AT, Cymru/Wales, UK
| | - Xue Zhang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116024, P. R. China
| | - Jianzhang Zhao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116024, P. R. China
| | - Peter N Horton
- UK National Crystallographic Service, Chemistry, Faculty of Natural and Environmental Sciences, University of Southampton, Highfield, Southampton, SO17 1BJ, UK
| | - Simon J Coles
- UK National Crystallographic Service, Chemistry, Faculty of Natural and Environmental Sciences, University of Southampton, Highfield, Southampton, SO17 1BJ, UK
| | - Joseph M Beames
- School of Chemistry, Cardiff University, Main Building, Cardiff, CF10 3AT, Cymru/Wales, UK
| | - Simon J A Pope
- School of Chemistry, Cardiff University, Main Building, Cardiff, CF10 3AT, Cymru/Wales, UK
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10
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Zhao J, Zhang X, Fang L, Gao C, Xu C, Gou S. Iridium(III) Complex-Derived Polymeric Micelles with Low Dark Toxicity and Strong NIR Excitation for Phototherapy and Chemotherapy. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2000363. [PMID: 32174002 DOI: 10.1002/smll.202000363] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Accepted: 02/20/2020] [Indexed: 06/10/2023]
Abstract
Iridium(III) complexes are potent candidates for photodynamic therapy. However, their clinical usage is impeded by their poor water solubility, high dark toxicity, and negligible absorption in near-infrared region (NIR region). Here, it is proposed to solve these challenges by developing an iridium(III) complexe-based polymeric micelle system. This system is self-assembled using an iridium(III) complex-containing amphiphilic block polymer. The upconversion nanoparticles are included in the polymeric micelles to permit NIR excitation. Compared with the nonformulated iridium(III) complexes, under NIR stimulation, this polymeric micelle system exhibits higher 1 O2 generation efficiency, negligible dark toxicity, excellent tumor-targeting ability, and synergistic phototherapy-chemotherapy effect both in vitro and in vivo.
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Affiliation(s)
- Jian Zhao
- Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research and Pharmaceutical Research Center, School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China
| | - Xinzhong Zhang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, China
| | - Lei Fang
- Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research and Pharmaceutical Research Center, School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China
| | - Chuanzhu Gao
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, China
| | - Chenjie Xu
- Department of Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, China
| | - Shaohua Gou
- Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research and Pharmaceutical Research Center, School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China
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11
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Wu X, Jia M, Huang M, Kim JK, Zhao Z, Liu J, Xi J, Li Y, Wu Y. A visible-light-induced “on–off” one-pot synthesis of 3-arylacetylene coumarins with AIE properties. Org Biomol Chem 2020; 18:3346-3353. [DOI: 10.1039/d0ob00479k] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A mild one-pot approach to 3-arylacetylene coumarins with potential AIE activities was developed via photosensitizer-free photocatalysis and thermocatalysis.
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Affiliation(s)
- Xinjie Wu
- College of Chemistry
- Henan Key Laboratory of Chemical Biology and Organic Chemistry
- Key Laboratory of Applied Chemistry of Henan Universities
- Zhengzhou University
- Zhengzhou
| | - Ming Jia
- School of Materials Science and Engineering
- Zhengzhou University
- Zhengzhou 450052
- P.R. China
| | - Mengmeng Huang
- College of Chemistry
- Henan Key Laboratory of Chemical Biology and Organic Chemistry
- Key Laboratory of Applied Chemistry of Henan Universities
- Zhengzhou University
- Zhengzhou
| | - Jung Keun Kim
- College of Chemistry
- Henan Key Laboratory of Chemical Biology and Organic Chemistry
- Key Laboratory of Applied Chemistry of Henan Universities
- Zhengzhou University
- Zhengzhou
| | - Zheng Zhao
- Department of Chemistry
- The Hong Kong University of Science and Technology
- P.R. China
| | - Junkai Liu
- Department of Chemistry
- The Hong Kong University of Science and Technology
- P.R. China
| | - Jinhu Xi
- College of Chemistry
- Henan Key Laboratory of Chemical Biology and Organic Chemistry
- Key Laboratory of Applied Chemistry of Henan Universities
- Zhengzhou University
- Zhengzhou
| | - Yabo Li
- College of Chemistry
- Henan Key Laboratory of Chemical Biology and Organic Chemistry
- Key Laboratory of Applied Chemistry of Henan Universities
- Zhengzhou University
- Zhengzhou
| | - Yangjie Wu
- College of Chemistry
- Henan Key Laboratory of Chemical Biology and Organic Chemistry
- Key Laboratory of Applied Chemistry of Henan Universities
- Zhengzhou University
- Zhengzhou
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12
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Oberhofer KE, Musheghyan M, Wegscheider S, Wörle M, Iglev ED, Nikolova RD, Kienberger R, Pekov PS, Iglev H. Individual control of singlet lifetime and triplet yield in halogen-substituted coumarin derivatives. RSC Adv 2020; 10:27096-27102. [PMID: 35515756 PMCID: PMC9055543 DOI: 10.1039/d0ra05737a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 10/01/2020] [Accepted: 07/07/2020] [Indexed: 11/21/2022] Open
Abstract
The photophysical properties of three 3-diethylphosphonocoumarin derivatives are studied by transient absorption spectroscopy and DFT calculations. The measured lifetime of the first excited singlet state changes upon halogen substitution at the 6-position from 40 ps for the unsubstituted compound to 100 ps for Cl and 24 ps for Br. This observation is in clear contradiction with the estimated singlet–triplet quantum yield, which increases with atomic weight of the substituted atom and is usually referred as a heavy-atom effect. The DFT calculations give evidence that the main reason for this behavior is the different composition of the HOMO, while the LUMO is similar for all three compounds. The optical excitation leads to intramolecular charge transfer from the halogen lone pairs to the π* molecular orbital and thus to a significant change in the molecular dipole moment. Hence, the latter phenomenon in combination with the heavy-atom effect enables an independent control of singlet lifetime and singlet–triplet quantum yield in the studied 3-diethylphosphonocoumarin derivatives. The photophysical properties of three 3-diethylphosphonocoumarin derivatives are studied by transient absorption spectroscopy and DFT calculations.![]()
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Affiliation(s)
| | | | | | - Martin Wörle
- Physics Department E11
- Technical University of Munich
- Germany
| | - Eleonora D. Iglev
- Physics Department E11
- Technical University of Munich
- Germany
- W. L. Gore & Associates GmbH
- 85640 Putzbrunn
| | | | | | - Petko St. Pekov
- Faculty of Chemistry and Pharmacy
- University of Sofia
- 1164 Sofia
- Bulgaria
| | - Hristo Iglev
- Physics Department E11
- Technical University of Munich
- Germany
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13
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Zhao J, Sun S, Li X, Zhang W, Gou S. Enhancing Photodynamic Therapy Efficacy of Upconversion-Based Nanoparticles Conjugated with a Long-Lived Triplet Excited State Iridium(III)-Naphthalimide Complex: Toward Highly Enhanced Hypoxia-Inducible Factor-1. ACS APPLIED BIO MATERIALS 2019; 3:252-262. [DOI: 10.1021/acsabm.9b00774] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Jian Zhao
- Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research and Pharmaceutical Research Center, School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
| | - Shuchen Sun
- Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research and Pharmaceutical Research Center, School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
| | - Xiaoyan Li
- The College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Wenjing Zhang
- The College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Shaohua Gou
- Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research and Pharmaceutical Research Center, School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
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Ligand-Tuneable, Red-Emitting Iridium(III) Complexes for Efficient Triplet-Triplet Annihilation Upconversion Performance. Chemistry 2018; 24:8577-8588. [DOI: 10.1002/chem.201801007] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Indexed: 11/07/2022]
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15
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16
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Lu Y, Conway-Kenny R, Wang J, Cui X, Zhao J, Draper SM. Exploiting coumarin-6 as ancillary ligands in 1,10-phenanthroline Ir(iii) complexes: generating triplet photosensitisers with high upconversion capabilities. Dalton Trans 2018; 47:8585-8589. [PMID: 29431810 DOI: 10.1039/c8dt00231b] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of new Ir(iii) complexes incorporating 3-(2-benzothiazolyl)-7-(diethylamino)coumarin (coumarin 6) and ethynylpyrene (EP) functionalised 1,10-phenanthroline (phen) were developed. [Ir(iii)(coumarin 6)2(3-EP-phen)](PF6) (Ir-3) proved to be the most promising material in triplet photosensitising applications. Highly absorbing at λ = 485 nm (ε = 1.31 × 105 M-1 cm-1), it exhibits high upconversion and singlet oxygen quantum yields (ΦUC = 27.5%, ΦΔ = 81.5%) and an exemplary upconversion capability (η = 3.60 × 106 M-1 cm-1).
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Affiliation(s)
- Y Lu
- Department of Chemistry, Trinity College Dublin, Dublin 2, Ireland.
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17
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Dou Q, Jiang L, Kai D, Owh C, Loh XJ. Bioimaging and biodetection assisted with TTA-UC materials. Drug Discov Today 2017; 22:1400-1411. [DOI: 10.1016/j.drudis.2017.04.003] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 03/13/2017] [Accepted: 04/12/2017] [Indexed: 10/19/2022]
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18
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Takizawa SY, Ikuta N, Zeng F, Komaru S, Sebata S, Murata S. Impact of Substituents on Excited-State and Photosensitizing Properties in Cationic Iridium(III) Complexes with Ligands of Coumarin 6. Inorg Chem 2016; 55:8723-35. [DOI: 10.1021/acs.inorgchem.6b01279] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Shin-ya Takizawa
- Department of Basic Science, Graduate School
of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | - Naoya Ikuta
- Department of Basic Science, Graduate School
of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | - Fanyang Zeng
- Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Shohei Komaru
- Department of Basic Science, Graduate School
of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | - Shinogu Sebata
- Department of Basic Science, Graduate School
of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | - Shigeru Murata
- Department of Basic Science, Graduate School
of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
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19
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Jiang X, Guo X, Peng J, Zhao D, Ma Y. Triplet-Triplet Annihilation Photon Upconversion in Polymer Thin Film: Sensitizer Design. ACS APPLIED MATERIALS & INTERFACES 2016; 8:11441-11449. [PMID: 27082767 DOI: 10.1021/acsami.6b01339] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Efficient visible-to-UV photon upconversion via triplet-triplet annihilation (TTA) is accomplished in polyurethane (PU) films by developing new, powerful photosensitizers fully functional in the solid-state matrix. These rationally designed triplet sensitizers feature a bichromophoric scaffold comprising a tris-cyclometalated iridium(III) complex covalently tethered to a suitable organic small molecule. The very rapid intramolecular triplet energy transfer from the former to the latter is pivotal for achieving the potent sensitizing ability, because this process out-competes the radiative and nonradiative decays inherent to the metal complex and produces long-lived triplet excitons localized with the acceptor moiety readily available for intermolecular transfer and TTA. Nonetheless, compared to the solution state, the molecular diffusion is greatly limited in solid matrices, which even creates difficulty for the Dexter-type intramolecular energy transfer. This is proven by the experimental results showing that the sensitizing performance of the bichromophoric molecules strongly depends on the spatial distance separating the donor (D) and acceptor (A) units and that incorporating a longer linker between the D and A evidently curbs the TTA upconversion efficiency in PU films. Using a rationally optimized sensitizer structure in combination with 2,7-di-tert-butylpyrene as the annihilator/emitter, the doped polyurethane (PU) films demonstrate effective visible-to-UV upconverted emission signal under noncoherent-light irradiation, attaining an upconversion quantum yield of 2.6%. Such quantum efficiency is the highest value so far reported for the visible-to-UV TTA systems in solid matrices.
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Affiliation(s)
- Xinpeng Jiang
- Beijing National Laboratory for Molecular Sciences, Center for Soft Matter Science and Engineering, Key Lab of Polymer Chemistry & Physics of the Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China
| | - Xinyan Guo
- Beijing National Laboratory for Molecular Sciences, Center for Soft Matter Science and Engineering, Key Lab of Polymer Chemistry & Physics of the Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China
| | - Jiang Peng
- Beijing National Laboratory for Molecular Sciences, Center for Soft Matter Science and Engineering, Key Lab of Polymer Chemistry & Physics of the Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China
| | - Dahui Zhao
- Beijing National Laboratory for Molecular Sciences, Center for Soft Matter Science and Engineering, Key Lab of Polymer Chemistry & Physics of the Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China
| | - Yuguo Ma
- Beijing National Laboratory for Molecular Sciences, Center for Soft Matter Science and Engineering, Key Lab of Polymer Chemistry & Physics of the Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China
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20
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Lanoë PH, Chan J, Gontard G, Monti F, Armaroli N, Barbieri A, Amouri H. Deep-Red Phosphorescent Iridium(III) Complexes with Chromophoric N-Heterocyclic Carbene Ligands: Design, Photophysical Properties, and DFT Calculations. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600140] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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21
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Jiang X, Peng J, Wang J, Guo X, Zhao D, Ma Y. Iridium-Based High-Sensitivity Oxygen Sensors and Photosensitizers with Ultralong Triplet Lifetimes. ACS APPLIED MATERIALS & INTERFACES 2016; 8:3591-600. [PMID: 26592255 DOI: 10.1021/acsami.5b07860] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
The photophysics of a series of bichromophoric molecules featuring an intramolecular triplet energy transfer between a triscyclometalated iridium(III) complex and covalently linked organic group are studied. By systematically varying the energy gap (0.1-0.3 eV) between the donor (metal complex) and acceptor (pyrene unit), reversible triplet energy transfer processes with equilibrium constant K ranging from ca. 500 to 40 000 are established. Unique photophysical consequences of such large K values are observed. Because of the highly imbalanced forward and backward energy transfer rates, triplet excitons dominantly populate the acceptor moiety in the steady state, giving rise to ultralong luminescence lifetimes up to 1-4 ms. Because the triscyclometalated Ir and triplet pyrene groups both impart relatively small nonradiative energy loss, decent phosphorescence quantum yields (Φ = 0.1-0.6) are attained in spite of the exceptionally prolonged excited states. By virtue of such precious combination of long-lived triplet state and high Φ, these bichromophoric molecules can serve as highly sensitive luminescent sensors for detecting trace amount of O2 and as potent photosensitizers for producing singlet oxygen even under low-oxygen content conditions.
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Affiliation(s)
- Xinpeng Jiang
- Beijing National Laboratory for Molecular Sciences, Center for Soft Matter Science and Engineering, Key Lab of Polymer Chemistry & Physics of the Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China
| | - Jiang Peng
- Beijing National Laboratory for Molecular Sciences, Center for Soft Matter Science and Engineering, Key Lab of Polymer Chemistry & Physics of the Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China
| | - Jianchun Wang
- Beijing National Laboratory for Molecular Sciences, Center for Soft Matter Science and Engineering, Key Lab of Polymer Chemistry & Physics of the Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China
| | - Xinyan Guo
- Beijing National Laboratory for Molecular Sciences, Center for Soft Matter Science and Engineering, Key Lab of Polymer Chemistry & Physics of the Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China
| | - Dahui Zhao
- Beijing National Laboratory for Molecular Sciences, Center for Soft Matter Science and Engineering, Key Lab of Polymer Chemistry & Physics of the Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China
| | - Yuguo Ma
- Beijing National Laboratory for Molecular Sciences, Center for Soft Matter Science and Engineering, Key Lab of Polymer Chemistry & Physics of the Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China
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22
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Yang W, Karatay A, Zhao J, Song J, Zhao L, Xing Y, Zhang C, He C, Yaglioglu HG, Hayvali M, Elmali A, Küçüköz B. Near-IR Broadband-Absorbing trans-Bisphosphine Pt(II) Bisacetylide Complexes: Preparation and Study of the Photophysics. Inorg Chem 2015. [PMID: 26196211 DOI: 10.1021/acs.inorgchem.5b01107] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Wenbo Yang
- State Key Laboratory of Fine Chemicals,
School of Chemical Engineering, Dalian University of Technology, E-208
West Campus, 2 Ling Gong Rd., Dalian 116024, P. R. China
| | | | - Jianzhang Zhao
- State Key Laboratory of Fine Chemicals,
School of Chemical Engineering, Dalian University of Technology, E-208
West Campus, 2 Ling Gong Rd., Dalian 116024, P. R. China
| | - Jian Song
- College of
Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, P. R. China
| | - Liang Zhao
- State Key Laboratory of Fine Chemicals,
School of Chemical Engineering, Dalian University of Technology, E-208
West Campus, 2 Ling Gong Rd., Dalian 116024, P. R. China
| | - Yongheng Xing
- College of
Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, P. R. China
| | - Caishun Zhang
- State Key Laboratory of Fine Chemicals,
School of Chemical Engineering, Dalian University of Technology, E-208
West Campus, 2 Ling Gong Rd., Dalian 116024, P. R. China
| | - Cheng He
- State Key Laboratory of Fine Chemicals,
School of Chemical Engineering, Dalian University of Technology, E-208
West Campus, 2 Ling Gong Rd., Dalian 116024, P. R. China
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23
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Dang TT, Bonneau M, Gareth Williams JA, Le Bozec H, Doucet H, Guerchais V. Pd-Catalyzed Functionalization of the Thenoyltrifluoroacetone Coligands by Aromatic Dyes in Bis(cyclometallated) IrIIIComplexes: From Phosphorescence to Fluorescence? Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500227] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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24
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Maity A, Sarkar R, Rajak KK. Heteroleptic iridium(iii) complexes bearing a coumarin moiety: an experimental and theoretical investigation. RSC Adv 2015. [DOI: 10.1039/c5ra08349d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Three mononuclear heteroleptic Ir(iii) complexes have been synthesized. The electronic structure and the spectral properties of the complexes were calculated applying the DFT-TDDFT method. The chemical shift was also computed by the GIAO-DFT method.
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Affiliation(s)
- Amit Maity
- Inorganic Chemistry Section
- Department of Chemistry
- Jadavpur University
- Kolkata 700032
- India
| | - Rupa Sarkar
- Inorganic Chemistry Section
- Department of Chemistry
- Jadavpur University
- Kolkata 700032
- India
| | - Kajal Krishna Rajak
- Inorganic Chemistry Section
- Department of Chemistry
- Jadavpur University
- Kolkata 700032
- India
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25
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Zhang ZH, Liu J, Wan LQ, Jiang FR, Lam CK, Ye BH, Qiao Z, Chao HY. Synthesis, characterization, photophysics, and anion binding properties of platinum(ii) acetylide complexes with urea group. Dalton Trans 2015; 44:7785-96. [DOI: 10.1039/c5dt00307e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The relationship between the structure and anion-binding ability of platinum(ii) acetylide complexes with urea group has been studied.
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Affiliation(s)
- Zhi-Hui Zhang
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry
- School of Chemistry and Chemical Engineering
- Sun Yat-Sen University
- Guangzhou 510275
- China
| | - Jiewei Liu
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry
- School of Chemistry and Chemical Engineering
- Sun Yat-Sen University
- Guangzhou 510275
- China
| | - Li-Qi Wan
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry
- School of Chemistry and Chemical Engineering
- Sun Yat-Sen University
- Guangzhou 510275
- China
| | - Fang-Ru Jiang
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry
- School of Chemistry and Chemical Engineering
- Sun Yat-Sen University
- Guangzhou 510275
- China
| | - Chi-Keung Lam
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry
- School of Chemistry and Chemical Engineering
- Sun Yat-Sen University
- Guangzhou 510275
- China
| | - Bao-Hui Ye
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry
- School of Chemistry and Chemical Engineering
- Sun Yat-Sen University
- Guangzhou 510275
- China
| | - Zhengping Qiao
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry
- School of Chemistry and Chemical Engineering
- Sun Yat-Sen University
- Guangzhou 510275
- China
| | - Hsiu-Yi Chao
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry
- School of Chemistry and Chemical Engineering
- Sun Yat-Sen University
- Guangzhou 510275
- China
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26
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Hasan K, Donato L, Shen Y, D. Slinker J, Zysman-Colman E. Cationic iridium(iii) complexes bearing ancillary 2,5-dipyridyl(pyrazine) (2,5-dpp) and 2,2′:5′,2′′-terpyridine (2,5-tpy) ligands: synthesis, optoelectronic characterization and light-emitting electrochemical cells. Dalton Trans 2014; 43:13672-82. [DOI: 10.1039/c4dt02100b] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Four green to deep red emitting cationic iridium(iii) complexes are reported as emitters for LEECs.
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Affiliation(s)
- Kamrul Hasan
- Département de Chimie
- Université de Sherbrooke
- Sherbrooke, Canada
| | - Loïc Donato
- Département de Chimie
- Université de Sherbrooke
- Sherbrooke, Canada
| | - Yulong Shen
- Department of Physics
- The University of Texas at Dallas
- Richardson, USA
| | - Jason D. Slinker
- Department of Physics
- The University of Texas at Dallas
- Richardson, USA
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