1
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Cui P, Wu Q. Density functional theory investigation of photoelectric conversion in graphene quantum dot/Ir(III) complex nanocomposites: the influence of π-conjugation in cyclometalating ligands. Photochem Photobiol Sci 2023; 22:2621-2634. [PMID: 37718379 DOI: 10.1007/s43630-023-00477-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Accepted: 08/29/2023] [Indexed: 09/19/2023]
Abstract
Using density functional theory (DFT), this study investigates the photoelectric performance of nanocomposites formed by coupling graphene quantum dots (GQDs) with Ir(III) complexes. The goal is to evaluate the influence of different π-conjugation levels in cyclometalating ligands and determine the most efficient ligand for energy conversion in the nanocomposite. The analysis covers seven distinct Ir(III) complexes, each featuring a common bpy ligand but differing diimine ligands. These complexes are linked to GQDs through amide connections. The study comprehensively examines electronic structure, absorption spectra, charge transfer, and chemical reactivity. Our results show that increased ligand π-conjugation causes a redshift in the absorption spectrum due to smaller highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) gaps, ultimately enhancing light harvesting. This effect becomes more pronounced when GQDs are incorporated. For less-conjugated ligands, attaching GQDs enhances metal-to-ligand charge transfer, facilitating electron injection into TiO2. Moreover, higher conjugation and GQD coupling reduce chemical hardness while increasing chemical potential and electrophilicity, thus improving electron acceptance. Furthermore, strategic structural variations modify free energy changes for electron injection and ground-state regeneration. Notable is the inclusion of perylene and pyrene moieties in the ligand, which accelerates injection and extends recombination lifetimes, while GQD incorporation accelerates injection across all ligands. Additionally, photocurrent generation primarily influences energy conversion efficiency. Finally, adding GQDs enhances the first-order hyperpolarizability, further boosting light harvesting. This study demonstrates the potential of tuning ligand π-conjugation and GQD interfaces to optimize optoelectronic properties and charge transfer dynamics, thereby enhancing solar energy conversion in GQD/Ir(III) complex systems.
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Affiliation(s)
- Peng Cui
- School of New Materials and Shoes & Clothing Engineering, Liming Vocational University, Quanzhou, China.
| | - Qiulan Wu
- School of New Materials and Shoes & Clothing Engineering, Liming Vocational University, Quanzhou, China
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2
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Chen Z, Wang H, Hu L, Zhu S, Liu R, Zhu H. Pt(II) diimine complexes bearing varied alkyl chains: Synthesis, tunable photophysical properties and aggregation-induced optical power limiting enhancement. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2021.120714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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3
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Ensley TR, O'Donnell RM, Mihaly JJ, Haley JE, Grusenmeyer TA, Gray TG. Two-photon absorption characterization and comparison of Au(I) fluorenyl benzothiazole complexes in the visible wavelength regime. APPLIED OPTICS 2021; 60:G199-G206. [PMID: 34613208 DOI: 10.1364/ao.427968] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 06/30/2021] [Indexed: 06/13/2023]
Abstract
We use the two-photon excited fluorescence method to determine the two-photon absorption (2PA) cross sections of three series of (fluorenyl benzothiazole) gold(I) complexes in the visible wavelength range from 570 to 700 nm. We compare the effect of ancillary ligand substitutions on the 2PA magnitudes and find that the ancillary ligand does not drastically affect either the magnitude or the shape of 2PA. Even so, moderate 2PA cross sections were measured that ranged from 10 to 1000 s of GM (Göppert-Mayer, =10-50cm4s/photon), making these types of complexes nonlinear optical materials for two-photon absorbing applications.
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4
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Al-Busaidi IJ, Haque A, Husband J, Al Rasbi NK, Abou-Zied OK, Al Balushi R, Khan MS, Raithby PR. Electronic and steric effects of platinum(ii) di-yne and poly-yne substituents on the photo-switching behaviour of stilbene: experimental and theoretical insights. Dalton Trans 2021; 50:2555-2569. [PMID: 33522534 DOI: 10.1039/d0dt03502e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A series of mono-, di-, and poly(platina-ynes) incorporating stilbene spacer units with the formulae trans-[R-C[triple bond, length as m-dash]C-Pt(PBu3)2-C[triple bond, length as m-dash]C-R] (R = (E)-1,2-diphenylethene), trans-[(Ph)-(Et3P)2PtC[triple bond, length as m-dash]C-R-C[triple bond, length as m-dash]CPt(PEt3)2(Ph)] (R = (E)-1,2-diphenylethene), and trans-[-(PnBu3)2PtC[triple bond, length as m-dash]C-R-C[triple bond, length as m-dash]C-]n (R = (E)-1,2-diphenylethene), respectively, have been synthesized and characterized to explore the effects of ligand topology on the photoisomerization and photophysical properties of these materials. The structural and photophysical properties of the complexes have been investigated and compared with those of the previously reported mono-, di- and poly(platina-ynes) incorporating azobenzene spacers. We found that the organometallic species 1M, 2M and 1P undergo topology-dependent reversible trans-to-cis photoisomerization in CH2Cl2 solution. Computational modelling supported the experimental findings.
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Affiliation(s)
- Idris Juma Al-Busaidi
- Department of Chemistry, Sultan Qaboos University, P.O. Box 36, Al Khoud 123, Sultanate of Oman.
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5
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Maria Maroń A, Choroba K, Pedzinski T, Machura B. Towards better understanding of the photophysics of platinum(ii) coordination compounds with anthracene- and pyrene-substituted 2,6-bis(thiazol-2-yl)pyridines. Dalton Trans 2020; 49:13440-13448. [DOI: 10.1039/d0dt02650f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photophysical properties of platinum(ii) compounds with 4-(9-anthryl)-2,6-bis(thiazol-2-yl)pyridine (1) and 4-(1-pyrenyl)-2,6-bis(thiazol-2-yl)pyridine (2) were widely investigated.
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Affiliation(s)
- Anna Maria Maroń
- Institute of Chemistry
- Faculty of Science and Technology
- University of Silesia in Katowice
- 40-006 Katowice
- Poland
| | - Katarzyna Choroba
- Institute of Chemistry
- Faculty of Science and Technology
- University of Silesia in Katowice
- 40-006 Katowice
- Poland
| | - Tomasz Pedzinski
- Faculty of Chemistry
- Adam Mickiewicz University
- 61-614 Poznan
- Poland
- Center for Advanced Technology
| | - Barbara Machura
- Institute of Chemistry
- Faculty of Science and Technology
- University of Silesia in Katowice
- 40-006 Katowice
- Poland
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6
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7
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Ai Y, Li Y, Fu HLK, Chan AKW, Yam VWW. Aggregation and Tunable Color Emission Behaviors of l-Glutamine-Derived Platinum(II) Bipyridine Complexes by Hydrogen-Bonding, π-π Stacking and Metal-Metal Interactions. Chemistry 2019; 25:5251-5258. [PMID: 30680815 DOI: 10.1002/chem.201805901] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Indexed: 12/13/2022]
Abstract
An l-glutamine-derived functional group was introduced to the bis(arylalkynyl)platinum(II) bipyridine complexes 1-4. The emission could be switched between the 3 MLCT excited state and the triplet excimeric state through solvent or temperature changes, which is attributed to the formation and disruption of hydrogen-bonding, π-π stacking, and metal-metal interactions. Different architectures with various morphologies, such as honeycomb nanostructures and nanospheres, were formed upon solvent variations, and these changes were accompanied by 1 H NMR and distinct emission changes. Additionally, yellow and red emissive metallogels were formed at room temperature due to the different aggregation behaviors introduced by the substituent groups on bipyridine. The thermoresponsive metallogel showed emission behavior with tunable colors by controlling the temperature. The negative Gibbs free-energy change (ΔG) and the large association constant for excimer formation have suggested that the molecules undergo aggregation through hydrogen-bonding, π-π, and metal-metal interactions, resulting in triplet excimeric emission.
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Affiliation(s)
- Yeye Ai
- Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, P. R. China.,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
| | - Yongguang Li
- Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, P. R. China
| | - Heidi Li-Ki Fu
- 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
| | - Alan Kwun-Wa 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
| | - Vivian Wing-Wah Yam
- Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, P. R. China.,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
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8
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Cerezo J, Requena A, Zúñiga J, Piernas MJ, Santana MD, Pérez J, García L. Structure, Spectra, and DFT Simulation of Nickel Benzazolate Complexes with Tris(2-aminoethyl)amine Ligand. Inorg Chem 2017; 56:3663-3673. [DOI: 10.1021/acs.inorgchem.7b00059] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Javier Cerezo
- Departamento de
Química Física, Universidad de Murcia, E-30071 Murcia, Spain
| | - Alberto Requena
- Departamento de
Química Física, Universidad de Murcia, E-30071 Murcia, Spain
| | - José Zúñiga
- Departamento de
Química Física, Universidad de Murcia, E-30071 Murcia, Spain
| | - María José Piernas
- Departamento de Química Inorgánica, Universidad de Murcia, E-30071 Murcia, Spain
| | - M. Dolores Santana
- Departamento de Química Inorgánica, Universidad de Murcia, E-30071 Murcia, Spain
| | - José Pérez
- Departamento de
Ingeniería Minera, Geológica y Cartográfica,
Área de Química Inorgánica, Universidad Politécnica de Cartagena, E-30203 Cartagena, Spain
| | - Luís García
- Departamento de
Ingeniería Minera, Geológica y Cartográfica,
Área de Química Inorgánica, Universidad Politécnica de Cartagena, E-30203 Cartagena, Spain
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9
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Lu T, Wang C, Lystrom L, Pei C, Kilina S, Sun W. Effects of extending the π-conjugation of the acetylide ligand on the photophysics and reverse saturable absorption of Pt(ii) bipyridine bisacetylide complexes. Phys Chem Chem Phys 2016; 18:28674-28687. [DOI: 10.1039/c6cp02628a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Extending the acetylide ligand π-conjugation diminishes the terminal substituent effect on the lowest excited states, but expands the triplet excited-state absorption to the near-IR region.
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Affiliation(s)
- Taotao Lu
- Department of Chemistry and Biochemistry
- North Dakota State University
- Fargo
- USA
| | - Chengzhe Wang
- Department of Chemistry and Biochemistry
- North Dakota State University
- Fargo
- USA
| | - Levi Lystrom
- Department of Chemistry and Biochemistry
- North Dakota State University
- Fargo
- USA
| | - Chengkui Pei
- Department of Chemistry and Biochemistry
- North Dakota State University
- Fargo
- USA
| | - Svetlana Kilina
- Department of Chemistry and Biochemistry
- North Dakota State University
- Fargo
- USA
| | - Wenfang Sun
- Department of Chemistry and Biochemistry
- North Dakota State University
- Fargo
- USA
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10
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Liu R, Dandu N, McCleese C, Li Y, Lu T, Li H, Yost D, Wang C, Kilina S, Burda C, Sun W. Influence of a Naphthaldiimide Substituent at the Diimine Ligand on the Photophysics and Reverse Saturable Absorption of Pt
II
Diimine Complexes and Cationic Ir
III
Complexes. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500882] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Rui Liu
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108‐6050, USA, http://https://www.ndsu.edu/chemistry/people/faculty/sun.html
- Department of Applied Chemistry, College of Sciences, Nanjing Tech University, Nanjing 211816, P.R. China
| | - Naveen Dandu
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108‐6050, USA, http://https://www.ndsu.edu/chemistry/people/faculty/sun.html
| | - Christopher McCleese
- Department of Chemistry, Case Western Reserve University, Cleveland, Ohio 44106, USA
| | - Yuhao Li
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108‐6050, USA, http://https://www.ndsu.edu/chemistry/people/faculty/sun.html
| | - Taotao Lu
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108‐6050, USA, http://https://www.ndsu.edu/chemistry/people/faculty/sun.html
| | - Hui Li
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108‐6050, USA, http://https://www.ndsu.edu/chemistry/people/faculty/sun.html
| | - Dillon Yost
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108‐6050, USA, http://https://www.ndsu.edu/chemistry/people/faculty/sun.html
| | - Chengzhe Wang
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108‐6050, USA, http://https://www.ndsu.edu/chemistry/people/faculty/sun.html
| | - Svetlana Kilina
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108‐6050, USA, http://https://www.ndsu.edu/chemistry/people/faculty/sun.html
| | - Clemens Burda
- Department of Chemistry, Case Western Reserve University, Cleveland, Ohio 44106, USA
| | - Wenfang Sun
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108‐6050, USA, http://https://www.ndsu.edu/chemistry/people/faculty/sun.html
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11
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Zhou P, Wang C, Qiu QM, Yao JF, Sheng CF, Li H. Controllable synthesis of nucleotide complex based on pH control: a small-molecule fluorescent probe as an auxiliary ligand to indicate the pre-organization of the nucleotide complex in solution. Dalton Trans 2015; 44:17810-8. [PMID: 26399499 DOI: 10.1039/c5dt02624e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Different CMP-bpe-M(ii) (CMP = cytidine monophosphate, bpe = bis(4-pyridyl)ethylene, M(ii) = Mn(2+) and Co(2+)) complexes are synthesized controllably based on pH control and well studied by X-ray single-crystal diffraction analysis. Interestingly, the suitable pH conditions are explored by considering the pre-organization modes of CMP, bpe, and M(2+) in aqueous solution by fluorescence spectroscopy based on acid/basic titration. The organic base bpe serves as a small-molecule fluorescent probe to indicate the changes of pre-organization modes along with the changes of the solution acidity. Furthermore, a perfect self-complementary sugar-base hydrogen bond is first reported based on the crystal structure analysis in this work, and different chiralities and SHG activities of CMP-bpe-Mn(ii) complexes obtained at different pH values are studied.
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Affiliation(s)
- Pei Zhou
- Key Laboratory of Clusters Science of Ministry of Education, School of Science, Beijing Institute of Technology, Beijing 100081, P. R. China. lihui@ bit.edu.cn
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12
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Yam VWW, Au VKM, Leung SYL. Light-Emitting Self-Assembled Materials Based on d8 and d10 Transition Metal Complexes. Chem Rev 2015; 115:7589-728. [DOI: 10.1021/acs.chemrev.5b00074] [Citation(s) in RCA: 1065] [Impact Index Per Article: 118.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- 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, P. R. China
| | - Vonika Ka-Man Au
- 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, P. R. China
| | - Sammual Yu-Lut Leung
- 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, P. R. China
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13
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Ou Z, Feng Z, Liu G, Chen Y, Gao Y, Li Y, Wang X. Synthesis and G-Quadruplex-binding Properties of Cationic Platinum(II) Terpyridine Complexes Containing σ-Alkynyl Auxiliaries. CHEM LETT 2015. [DOI: 10.1246/cl.141045] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Zhize Ou
- The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, Department of Applied Chemistry, School of Science, Northwestern Polytechnical University
| | - Zhao Feng
- The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, Department of Applied Chemistry, School of Science, Northwestern Polytechnical University
| | - Guixia Liu
- The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, Department of Applied Chemistry, School of Science, Northwestern Polytechnical University
| | - Yongjie Chen
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, TIPC, CAS
| | - Yunyan Gao
- The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, Department of Applied Chemistry, School of Science, Northwestern Polytechnical University
| | - Yi Li
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, TIPC, CAS
| | - Xuesong Wang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, TIPC, CAS
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14
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Liu R, Li Y, Chang J, Waclawik ER, Sun W. Pt(II) Bipyridyl Complexes Bearing Substituted Fluorenyl Motif on the Bipyridyl and Acetylide Ligands: Synthesis, Photophysics, and Reverse Saturable Absorption. Inorg Chem 2014; 53:9516-30. [DOI: 10.1021/ic500646r] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rui Liu
- Department
of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States
| | - Yuhao Li
- Department
of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States
| | - Jin Chang
- Science
and Engineering Faculty, Queensland University of Technology, 2 George
Street, Brisbane, Queensland 4000, Australia
| | - Eric R. Waclawik
- Science
and Engineering Faculty, Queensland University of Technology, 2 George
Street, Brisbane, Queensland 4000, Australia
| | - Wenfang Sun
- Department
of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States
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15
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López-Banet L, Santana MD, Piernas MJ, García G, Cerezo J, Requena A, Zúñiga J, Pérez J, García L. Structure and Spectroscopic Properties of Nickel Benzazolate Complexes with Hydrotris(pyrazolyl)borate Ligand. Inorg Chem 2014; 53:5502-14. [DOI: 10.1021/ic5001655] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Luisa López-Banet
- Departamento
de Química Inorgánica, Universidad de Murcia, E-30071 Murcia, Spain
| | - M. Dolores Santana
- Departamento
de Química Inorgánica, Universidad de Murcia, E-30071 Murcia, Spain
| | - María José Piernas
- Departamento
de Química Inorgánica, Universidad de Murcia, E-30071 Murcia, Spain
| | - Gabriel García
- Departamento
de Química Inorgánica, Universidad de Murcia, E-30071 Murcia, Spain
| | - Javier Cerezo
- Departamento de
Química Física, Universidad de Murcia, E-30071 Murcia, Spain
| | - Alberto Requena
- Departamento de
Química Física, Universidad de Murcia, E-30071 Murcia, Spain
| | - José Zúñiga
- Departamento de
Química Física, Universidad de Murcia, E-30071 Murcia, Spain
| | - José Pérez
- Departamento de Ingeniería
Minera, Geológica y Cartográfica, Área de Química
Inorgánica, Universidad Politécnica de Cartagena, E-30203 Cartagena, Spain
| | - Luís García
- Departamento de Ingeniería
Minera, Geológica y Cartográfica, Área de Química
Inorgánica, Universidad Politécnica de Cartagena, E-30203 Cartagena, Spain
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16
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Liu XG, Sun W. Synthesis, Photophysics, and Reverse Saturable Absorption of Bipyridyl Platinum(II) Bis(acetylide) Complexes Bearing Aromatic Electron-Withdrawing Substituents on the Acetylide Ligands. J Phys Chem A 2014; 118:10318-25. [DOI: 10.1021/jp500397g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xu-Guang Liu
- Department
of Chemistry and
Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States
| | - Wenfang Sun
- Department
of Chemistry and
Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States
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17
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Winkel RW, Dubinina GG, Abboud KA, Schanze KS. Photophysical properties of trans-platinum acetylide complexes featuring N-heterocyclic carbene ligands. Dalton Trans 2014; 43:17712-20. [DOI: 10.1039/c4dt01520g] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Platinum acetylide complexes featuring NHC-carbene ligands show enhanced photophysical properties relative to complexes with phosphine ligands.
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18
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Liu R, Dandu N, Li Y, Kilina S, Sun W. Synthesis, photophysics and reverse saturable absorption of bipyridyl platinum(II) bis(arylfluorenylacetylide) complexes. Dalton Trans 2013; 42:4398-409. [PMID: 23338679 DOI: 10.1039/c2dt32153j] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of Pt(II) bipyridyl complexes with different aryl substituents (Ar = naphthyl (1a), anthryl (1b), pyrenyl (1c) and phenothiazyl (1d)) on the fluorenylacetylide ligands are synthesized and investigated. The influence of the aryl substituent on the photophysics of these complexes is systematically investigated by spectroscopic methods and simulated by time dependent density functional theory (TD-DFT). All complexes exhibit ligand-centered (1)π,π* transitions significantly admixed with the metal-to-ligand charge transfer ((1)MLCT)/ligand-to-ligand charge transfer ((1)LLCT) transitions in the UV and blue spectral region, and broad, structureless (1)MLCT/(1)LLCT absorption bands in the visible spectral region. All complexes are emissive in solution at room temperature, with the fluorescence originating predominantly from the (1)MLCT/(1)LLCT states. The triplet emitting state is dominated by the (3)π,π* state localized on the fluorenylacetylide motif and mixed with some (3)ML'CT character (metal-to-fluorenylacetylide ligand charge transfer) for 1a, 1b and 1d. For 1c, the phosphorescence predominantly originates from the pyrene localized (3)π,π* state. The variation in the photophysical properties is related to the twisting angle of the aryl substituent from the fluorenyl plane, which defines the conjugation between the substituents and fluorenylacetylide ligands and, consequently, alters the energy and intensity of absorption and emission in these complexes. also exhibit broadband triplet excited-state absorption in the visible spectral region. Therefore, they show strong reverse saturable absorption at 532 nm for nanosecond laser pulses as demonstrated by the nonlinear transmission experiment.
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Affiliation(s)
- Rui Liu
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND 58108-6050, USA
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19
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Liu X, Sun W. Platinum(II) Complexes Bearing 2‐(9,9‐Dihexadecyl‐7‐R‐fluoren‐2‐yl)‐1,10‐phenanthroline Ligands: Synthesis, Photophysics and Reverse Saturable Absorption. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300466] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xu‐Guang Liu
- Department of Chemistry and Biochemistry, North Dokota State University, Fargo, ND 58108‐6050, USA, Fax: +1‐701‐231‐8831, http://www.ndsu.nodak.edu/chemistry/people/faculty/sun.html
| | - Wenfang Sun
- Department of Chemistry and Biochemistry, North Dokota State University, Fargo, ND 58108‐6050, USA, Fax: +1‐701‐231‐8831, http://www.ndsu.nodak.edu/chemistry/people/faculty/sun.html
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Li Z, Badaeva E, Ugrinov A, Kilina S, Sun W. Platinum Chloride Complexes Containing 6-[9,9-Di(2-ethylhexyl)-7-R-9H-fluoren-2-yl]-2,2′-bipyridine Ligand (R = NO2, CHO, Benzothiazol-2-yl, n-Bu, Carbazol-9-yl, NPh2): Tunable Photophysics and Reverse Saturable Absorption. Inorg Chem 2013; 52:7578-92. [DOI: 10.1021/ic400683u] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhongjing Li
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota
58108-6050, United States
| | - Ekaterina Badaeva
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota
58108-6050, United States
| | - Angel Ugrinov
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota
58108-6050, United States
| | - Svetlana Kilina
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota
58108-6050, United States
| | - Wenfang Sun
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota
58108-6050, United States
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Kourtesi C, Ball AR, Huang YY, Jachak SM, Vera DMA, Khondkar P, Gibbons S, Hamblin MR, Tegos GP. Microbial efflux systems and inhibitors: approaches to drug discovery and the challenge of clinical implementation. Open Microbiol J 2013; 7:34-52. [PMID: 23569468 PMCID: PMC3617545 DOI: 10.2174/1874285801307010034] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2012] [Revised: 01/22/2013] [Accepted: 01/23/2013] [Indexed: 12/16/2022] Open
Abstract
Conventional antimicrobials are increasingly ineffective due to the emergence of multidrug-resistance among pathogenic microorganisms. The need to overcome these deficiencies has triggered exploration for novel and unconventional approaches to controlling microbial infections. Multidrug efflux systems (MES) have been a profound obstacle in the successful deployment of antimicrobials. The discovery of small molecule efflux system blockers has been an active and rapidly expanding research discipline. A major theme in this platform involves efflux pump inhibitors (EPIs) from natural sources. The discovery methodologies and the available number of natural EPI-chemotypes are increasing. Advances in our understanding of microbial physiology have shed light on a series of pathways and phenotypes where the role of efflux systems is pivotal. Complementing existing antimicrobial discovery platforms such as photodynamic therapy (PDT) with efflux inhibition is a subject under investigation. This core information is a stepping stone in the challenge of highlighting an effective drug development path for EPIs since the puzzle of clinical implementation remains unsolved. This review summarizes advances in the path of EPI discovery, discusses potential avenues of EPI implementation and development, and underlines the need for highly informative and comprehensive translational approaches.
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Affiliation(s)
- Christina Kourtesi
- Department of Pathology, University of New Mexico, School of Medicine, Albuquerque, NM, USA ; Department of Pathology, Faculty of Medicine, National & Kapodistrian University of Athens, Greece
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22
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Liu R, Azenkeng A, Zhou D, Li Y, Glusac KD, Sun W. Tuning Photophysical Properties and Improving Nonlinear Absorption of Pt(II) Diimine Complexes with Extended π-Conjugation in the Acetylide Ligands. J Phys Chem A 2013; 117:1907-17. [DOI: 10.1021/jp309841x] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Rui Liu
- Department of Chemistry and
Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States
| | - Alexander Azenkeng
- Energy and Environmental Research
Center, University of North Dakota, Grand
Forks, North Dakota 58202-9018, United States
| | - Dapeng Zhou
- Department of Chemistry, Bowling Green State University, Bowling Green, Ohio
43403-0001, United States
| | - Yuhao Li
- Department of Chemistry and
Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States
| | - Ksenija D. Glusac
- Department of Chemistry, Bowling Green State University, Bowling Green, Ohio
43403-0001, United States
| | - Wenfang Sun
- Department of Chemistry and
Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States
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23
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Li Z, Sun W. Synthesis, photophysics, and reverse saturable absorption of platinum complexes bearing extended π-conjugated C^N^N ligands. Dalton Trans 2013; 42:14021-9. [DOI: 10.1039/c3dt51430g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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24
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Nonlinear Absorbing Platinum(II) Diimine Complexes: Synthesis, Photophysics, and Reverse Saturable Absorption. Chemistry 2012; 18:11440-8. [DOI: 10.1002/chem.201200254] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2012] [Revised: 05/18/2012] [Indexed: 11/07/2022]
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25
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Liu R, Azenkeng A, Li Y, Sun W. Long-lived platinum(ii) diimine complexes with broadband excited-state absorption: efficient nonlinear absorbing materials. Dalton Trans 2012; 41:12353-7. [DOI: 10.1039/c2dt31267k] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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