51
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Tang MC, Chan AKW, Chan MY, Yam VWW. Platinum and Gold Complexes for OLEDs. Top Curr Chem (Cham) 2016; 374:46. [PMID: 27573398 DOI: 10.1007/s41061-016-0046-y] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 06/14/2016] [Indexed: 12/20/2022]
Abstract
Encouraging efforts on the design of high-performance organic materials and smart architecture during the past two decades have made organic light-emitting device (OLED) technology an important competitor for the existing liquid crystal displays. Particularly, the development of phosphorescent materials based on transition metals plays a crucial role for this success. Apart from the extensively studied iridium(III) complexes with d(6) electronic configuration and octahedral geometry, the coordination-unsaturated nature of d(8) transition metal complexes with square-planar structures has been found to provide intriguing spectroscopic and luminescence properties. This article briefly summarizes the development of d(8) platinum(II) and gold(III) complexes and their application studies in the fabrication of phosphorescent OLEDs. An in-depth understanding of the nature of the excited states has offered a great opportunity to fine-tune the emission colors covering the entire visible spectrum as well as to improve their photophysical properties. With good device engineering, high performance vacuum-deposited OLEDs with external quantum efficiencies (EQEs) of up to 30 % and solution-processable OLEDs with EQEs of up to 10 % have been realized by modifying the cyclometalated or pincer ligands of these metal complexes. These impressive demonstrations reveal that d(8) metal complexes are promising candidates as phosphorescent materials for OLED applications in displays as well as in solid-state lighting in the future.
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Affiliation(s)
- Man-Chung Tang
- 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, China
| | - 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, 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, 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, China.
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52
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Chan K, Yik-Sham Chung C, Wing-Wah Yam V. Parallel folding topology-selective label-free detection and monitoring of conformational and topological changes of different G-quadruplex DNAs by emission spectral changes via FRET of mPPE-Ala-Pt(ii) complex ensemble. Chem Sci 2016; 7:2842-2855. [PMID: 30090278 PMCID: PMC6055111 DOI: 10.1039/c5sc04563k] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 01/05/2016] [Indexed: 12/28/2022] Open
Abstract
The formation of supramolecular assemblies between [Pt(bzimpy-Et){C[triple bond, length as m-dash]CC6H4(CH2NMe3-4)}]Cl2 (1) and mPPE-Ala and the FRET properties of the ensemble have been revealed from the UV-vis absorption, steady-state emission and time-resolved emission decay studies. The two-component mPPE-Ala-1 ensemble has been employed in a "proof-of-principle" concept for label-free detection of G-quadruplex DNAs with the intramolecular propeller parallel folding topology, such as c-myc, in aqueous buffer solution. By the modulation of the aggregation/deaggregation of the polymer-metal complex aggregates and hence the FRET from the mPPE-Ala donor to the aggregated 1 as acceptor, the ensemble has been demonstrated for sensitive and selective label-free detection of c-myc via the monitoring of emission spectral changes of the ensemble. Ratiometric emission of the ensemble at 461 and 662 nm has been shown to distinguish the intramolecular propeller parallel G-quadruplex folding topology of c-myc from other G-quadruplex-forming sequences of different folding topologies, owing to the strong and specific interactions between c-myc and 1 as suggested by the UV-vis absorption and UV melting studies. In addition, the formation of high-order intermolecular multimeric G-quadruplexes from c-myc under molecular crowding conditions has been successfully probed by the ratiometric emission of the ensemble. The conformational and topological transition of human telomeric DNA from the mixed-hybrid form to the intramolecular propeller parallel form, as observed from the circular dichroism spectroscopy, has also been monitored by the ratiometric emission of the ensemble. The ability of the ensemble to detect these conformational and topological transitions of G-quadruplex DNAs has been rationalized by the excellent selectivity and sensitivity of the ensemble towards the intramolecular propeller parallel G-quadruplex DNAs and their high-order intermolecular multimers, which are due to the extra stabilization gained from Pt···Pt and π-π interactions in addition to the electrostatic and hydrophobic interactions found in the polymer-metal complex aggregates.
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Affiliation(s)
- Kevin Chan
- Institute of Molecular Functional Materials (Areas of Excellence Scheme, University Grants Committee (Hong Kong)) , Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , P. R. China .
| | - Clive Yik-Sham Chung
- Institute of Molecular Functional Materials (Areas of Excellence Scheme, University Grants Committee (Hong Kong)) , Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , P. R. China .
| | - Vivian Wing-Wah Yam
- Institute of Molecular Functional Materials (Areas of Excellence Scheme, University Grants Committee (Hong Kong)) , Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , P. R. China .
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53
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Jiang B, Zhang J, Ma JQ, Zheng W, Chen LJ, Sun B, Li C, Hu BW, Tan H, Li X, Yang HB. Vapochromic Behavior of a Chair-Shaped Supramolecular Metallacycle with Ultra-Stability. J Am Chem Soc 2016; 138:738-41. [DOI: 10.1021/jacs.5b11409] [Citation(s) in RCA: 148] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
| | | | - Jian-Qiu Ma
- Department
of Chemistry, Beijing Normal University, Beijing 100050, P. R. China
| | | | | | | | | | | | - Hongwei Tan
- Department
of Chemistry, Beijing Normal University, Beijing 100050, P. R. China
| | - Xiaopeng Li
- Department
of Chemistry and Biochemistry, Texas State University, San Marcos, Texas 78666, United States
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54
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Naziruddin AR, Lee CS, Lin WJ, Sun BJ, Chao KH, Chang AHH, Hwang WS. Platinum complexes bearing normal and mesoionic N-heterocyclic carbene based pincer ligands: syntheses, structures, and photo-functional attributes. Dalton Trans 2016; 45:5848-59. [DOI: 10.1039/c5dt04770f] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Platinum complexes featuring pyridine bis-N-heterocyclic imidazol-2-ylidene/triazol-5-ylidene donors are prepared and screened for vapo/mechanochromic attributes.
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Affiliation(s)
| | | | - Wan-Jung Lin
- National Dong Hwa University
- Hualien 97401
- Republic of China
| | - Bing-Jian Sun
- National Dong Hwa University
- Hualien 97401
- Republic of China
| | - Kang-Heng Chao
- National Dong Hwa University
- Hualien 97401
- Republic of China
| | | | - Wen-Shu Hwang
- National Dong Hwa University
- Hualien 97401
- Republic of China
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55
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Chan K, Chung CY, Yam VW. Conjugated Polyelectrolyte‐Induced Self‐Assembly of Alkynylplatinum(II) 2,6‐Bis(benzimidazol‐2′‐yl)pyridine Complexes. Chemistry 2015; 21:16434-47. [DOI: 10.1002/chem.201501804] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Indexed: 11/09/2022]
Affiliation(s)
- Kevin 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 (P. R. China)
| | - Clive Yik‐Sham Chung
- 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)
| | - 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)
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56
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Qian J, Hu J, Yoshikawa H, Zhang J, Awaga K, Zhang C. External‐Template‐Assisted Formation of Octacyanometalate‐Based M
V
–Mn
II
(M = W, Mo) Bimetallic Coordination Polymers with Magnetic Properties. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201403223] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Jun Qian
- China‐Australia Joint Research Center for Functional Molecular Materials, Scientific Research Academy, Jiangsu University, Zhenjiang 212013, P. R. China, http://chem.jiangnan.edu.cn/index.shtml
- China‐Australia Joint Research Center for Functional Molecular Materials, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, P. R. China
| | - Jingchun Hu
- China‐Australia Joint Research Center for Functional Molecular Materials, Scientific Research Academy, Jiangsu University, Zhenjiang 212013, P. R. China, http://chem.jiangnan.edu.cn/index.shtml
| | - Hirofumi Yoshikawa
- Research Center for Materials Science, Department of Chemistry, Graduate School of Science, Nagoya University, Furo‐cho, Chikusa‐ku, Nagoya 464‐8602, Japan
| | - Jinfang Zhang
- China‐Australia Joint Research Center for Functional Molecular Materials, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, P. R. China
| | - Kunio Awaga
- Research Center for Materials Science, Department of Chemistry, Graduate School of Science, Nagoya University, Furo‐cho, Chikusa‐ku, Nagoya 464‐8602, Japan
| | - Chi Zhang
- China‐Australia Joint Research Center for Functional Molecular Materials, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, P. R. China
- Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China
- Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
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57
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Liu N, He Q, Bu W. Self-assembly of star micelle into vesicle in solvents of variable quality: the star micelle retains its core-shell nanostructure in the vesicle. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:2262-2268. [PMID: 25634320 DOI: 10.1021/la504817q] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Intra- and intermolecular interactions of star polymers in dilute solutions are of fundamental importance for both theoretical interest and hierarchical self-assembly into functional nanostructures. Here, star micelles with a polystyrene corona and a small ionic core bearing platinum(II) complexes have been regarded as a model of star polymers to mimic their intra- and interstar interactions and self-assembled behaviors in solvents of weakening quality. In the chloroform/methanol mixture solvents, the star micelles can self-assemble to form vesicles, in which the star micelles shrink significantly and are homogeneously distributed on the vesicle surface. Unlike the morphological evolution of conventional amphiphiles from micellar to vesicular, during which the amphiphilic molecules are commonly reorganized, the star micelles still retain their core-shell nanostructures in the vesicles and the coronal chains of the star micelle between the ionic cores are fully interpenetrated.
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Affiliation(s)
- Nijuan Liu
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, State Key Laboratory of Applied Organic Chemistry, and College of Chemistry and Chemical Engineering, Lanzhou University , Lanzhou City, Gansu Province, China
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58
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Qin QP, Chen ZF, Shen WY, Jiang YH, Cao D, Li YL, Xu QM, Liu YC, Huang KB, Liang H. Synthesis of a platinum(II) complex with 2-(4-methoxy-phenyl) imidazo [4,5-f]-[1,10] phenanthrolin and study of its antitumor activity. Eur J Med Chem 2014; 89:77-87. [PMID: 25462228 DOI: 10.1016/j.ejmech.2014.10.019] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Revised: 09/23/2014] [Accepted: 10/08/2014] [Indexed: 11/28/2022]
Abstract
A new platinum(II) complex of [Pt(II)(L) (pn)]Cl·2H2O (1) (pn = 1,3-propanediamine) with 2-(4-methoxy-phenyl)imidazo [4,5-f]-[1,10]phenanthrolin (H-L) was synthesized and characterized. In complex 1, the platinum adopts a four-coordinated square planar geometry. Complex 1 exhibited selective cytotoxicity against NCI-H460, BEL-7402, SK-OV-3, SK-OV-3/DDP and HeLa cell lines with IC50 values in the micromolar range (9.7-35.8 μM), but low cytotoxicity toward normal human liver HL-7702 cells. Complex 1 caused HeLa cell cycle arrest at S phase and it induced HeLa apoptosis by the activation of caspase-3/9. Various experiments showed that complex 1 preferred to bind with G-quadruplex in c-myc. Taken together, we found that complex 1 exerted its antitumor activity mainly via inhibiting telomerase by interaction with c-myc quadruplex and activation of caspase-3/9.
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Affiliation(s)
- Qi-Pin Qin
- State Key Laboratory Cultivation Base for the Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry & Pharmacy of Guangxi Normal University, Yucai Road 15, Guilin 541004, PR China
| | - Zhen-Feng Chen
- State Key Laboratory Cultivation Base for the Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry & Pharmacy of Guangxi Normal University, Yucai Road 15, Guilin 541004, PR China.
| | - Wen-Ying Shen
- State Key Laboratory Cultivation Base for the Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry & Pharmacy of Guangxi Normal University, Yucai Road 15, Guilin 541004, PR China
| | - Yan-Hua Jiang
- State Key Laboratory Cultivation Base for the Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry & Pharmacy of Guangxi Normal University, Yucai Road 15, Guilin 541004, PR China
| | - Dong Cao
- State Key Laboratory Cultivation Base for the Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry & Pharmacy of Guangxi Normal University, Yucai Road 15, Guilin 541004, PR China
| | - Yu-Lan Li
- State Key Laboratory Cultivation Base for the Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry & Pharmacy of Guangxi Normal University, Yucai Road 15, Guilin 541004, PR China
| | - Qing-Min Xu
- State Key Laboratory Cultivation Base for the Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry & Pharmacy of Guangxi Normal University, Yucai Road 15, Guilin 541004, PR China
| | - Yan-Cheng Liu
- State Key Laboratory Cultivation Base for the Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry & Pharmacy of Guangxi Normal University, Yucai Road 15, Guilin 541004, PR China
| | - Ke-Bin Huang
- State Key Laboratory Cultivation Base for the Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry & Pharmacy of Guangxi Normal University, Yucai Road 15, Guilin 541004, PR China
| | - Hong Liang
- State Key Laboratory Cultivation Base for the Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry & Pharmacy of Guangxi Normal University, Yucai Road 15, Guilin 541004, PR China.
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59
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Wang Z, Niu JL, Zhang LZ, Guo JW, Hao XQ, Song MP. Synthesis, characterization and photophysical properties of the pincer platinum(II) complexes with m-bis(benzimidazol-2′-yl)benzene ligand. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.08.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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60
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Yim KC, Lam ESH, Wong KMC, Au VKM, Ko CC, Lam WH, Yam VWW. Synthesis, Characterization, Self-Assembly, Gelation, Morphology and Computational Studies of Alkynylgold(III) Complexes of 2,6-Bis(benzimidazol-2′-yl)pyridine Derivatives. Chemistry 2014; 20:9930-9. [DOI: 10.1002/chem.201402876] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Indexed: 12/16/2022]
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61
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Wang Z, Sun Z, Hao XQ, Niu JL, Wei D, Tu T, Gong JF, Song MP. Neutral and Cationic NCN Pincer Platinum(II) Complexes with 1,3-Bis(benzimidazol-2′-yl)benzene Ligands: Synthesis, Structures, and Their Photophysical Properties. Organometallics 2014. [DOI: 10.1021/om400946n] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Zhao Wang
- College of Chemistry
and Molecular Engineering,
Henan Key Laboratory of Chemical Biology and Organic Chemistry, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Zheming Sun
- Department of Chemistry, Fudan University, 220
Handan Road, Shanghai 200433, People’s Republic of China
| | - Xin-Qi Hao
- College of Chemistry
and Molecular Engineering,
Henan Key Laboratory of Chemical Biology and Organic Chemistry, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Jun-Long Niu
- College of Chemistry
and Molecular Engineering,
Henan Key Laboratory of Chemical Biology and Organic Chemistry, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Donghui Wei
- College of Chemistry
and Molecular Engineering,
Henan Key Laboratory of Chemical Biology and Organic Chemistry, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Tao Tu
- Department of Chemistry, Fudan University, 220
Handan Road, Shanghai 200433, People’s Republic of China
| | - Jun-Fang Gong
- College of Chemistry
and Molecular Engineering,
Henan Key Laboratory of Chemical Biology and Organic Chemistry, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Mao-Ping Song
- College of Chemistry
and Molecular Engineering,
Henan Key Laboratory of Chemical Biology and Organic Chemistry, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
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62
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Po C, Tam AYY, Yam VWW. Tuning of spectroscopic properties via variation of the alkyl chain length: a systematic study of molecular structural changes on self-assembly of amphiphilic sulfonate-pendant platinum(ii) bzimpy complexes in aqueous medium. Chem Sci 2014. [DOI: 10.1039/c4sc00411f] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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63
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Egorochkin A, Kuznetsova O, Khamaletdinova N, Domratcheva-Lvova L. Photophysical properties of organometallic complexes: Substituent effects. Polyhedron 2014. [DOI: 10.1016/j.poly.2013.10.030] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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64
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Lam WH, Lam ESH, Yam VWW. Computational Studies on the Excited States of Luminescent Platinum(II) Alkynyl Systems of Tridentate Pincer Ligands in Radiative and Nonradiative Processes. J Am Chem Soc 2013; 135:15135-43. [DOI: 10.1021/ja406810a] [Citation(s) in RCA: 94] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Wai Han Lam
- Institute of Molecular Functional
Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Pokfulam, Hong Kong, People’s Republic of China
| | - Elizabeth Suk-Hang Lam
- Institute of Molecular Functional
Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Pokfulam, Hong Kong, People’s Republic of China
| | - Vivian Wing-Wah Yam
- Institute of Molecular Functional
Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Pokfulam, Hong Kong, People’s Republic of China
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65
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Zhang Y, Blacque O, Venkatesan K. Highly Efficient Deep-Blue Emitters Based oncisandtransN-Heterocyclic Carbene PtIIAcetylide Complexes: Synthesis, Photophysical Properties, and Mechanistic Studies. Chemistry 2013; 19:15689-701. [DOI: 10.1002/chem.201302196] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Revised: 07/25/2013] [Indexed: 11/07/2022]
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66
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Li Y, Zhao L, Tam AYY, Wong KMC, Wu L, Yam VWW. Luminescent Amphiphilic 2,6-Bis(1,2,3-triazol-4-yl)pyridinePlatinum(II) Complexes: Synthesis, Characterization, Electrochemical, Photophysical, and Langmuir-Blodgett Film-Formation Studies. Chemistry 2013; 19:14496-505. [DOI: 10.1002/chem.201301788] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2013] [Indexed: 11/08/2022]
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67
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Chan AKW, Lam ESH, Tam AYY, Tsang DPK, Lam WH, Chan MY, Wong WT, Yam VWW. Synthesis and characterization of luminescent cyclometalated platinum(II) complexes of 1,3-bis-hetero-azolylbenzenes with tunable color for applications in organic light-emitting devices through extension of π conjugation by variation of the heteroatom. Chemistry 2013; 19:13910-24. [PMID: 23999951 DOI: 10.1002/chem.201301586] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Indexed: 01/09/2023]
Abstract
A series of luminescent cyclometalated platinum(II) complexes of N^C^N ligands [N^C^N=2,6-bis(benzoxazol-2'-yl)benzene (bzoxb), 2,6-bis(benzothiazol-2'-yl)benzene (bzthb), and 2,6-bis(N-alkylnaphthoimidazol-2'-yl)benzene (naphimb)] has been synthesized and characterized. Two of the platinum(II) complexes have been structurally characterized by X-ray crystallography. Their electrochemical, electronic absorption, and luminescence properties have been investigated. In dichloromethane solution at room temperature, the cyclometalated N^C^N platinum(II) complexes exhibited rich luminescence with well-resolved vibronic-structured emission bands. The emission energies of the complexes are found to be closely related to the electronic properties of the N^C^N ligands. By varying the electronic properties of the cyclometalated ligands, a fine-tuning of the emission energies can be achieved, as supported by computational studies. Multilayer organic light-emitting devices have been prepared by utilizing two of these platinum(II) complexes as phosphorescent dopants, in which a saturated yellow emission with Commission International de I'Eclairage coordinates of (0.50, 0.49) was achieved.
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Affiliation(s)
- Alan Kwun-Wa Chan
- Department of Chemistry, The University of Hong Kong, Pokfulam Road (Hong Kong), Fax: (+852) 2857-1586
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68
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Syntheses, structures, properties and DFT calculations of coordination polymers constructed by 2,6-bis(benzimidazolyl)pyridine. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.05.041] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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69
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Wen HM, Wang JY, Li B, Zhang LY, Chen CN, Chen ZN. Phosphorescent Square-Planar Platinum(II) Complexes of 1,3-Bis(2-pyridylimino)isoindoline with a Monodentate Strong-Field Ligand. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300622] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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70
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Leung SYL, Lam ESH, Lam WH, Wong KMC, Wong WT, Yam VWW. Luminescent Cyclometalated Alkynylplatinum(II) Complexes with a Tridentate Pyridine-Based N-Heterocyclic Carbene Ligand: Synthesis, Characterization, Electrochemistry, Photophysics, and Computational Studies. Chemistry 2013; 19:10360-9. [DOI: 10.1002/chem.201300493] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Indexed: 12/28/2022]
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71
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Li Y, Lam ESH, Tam AYY, Wong KMC, Lam WH, Wu L, Yam VWW. Cholesterol-/Estradiol-Appended Alkynylplatinum(II) Complexes as Supramolecular Gelators: Synthesis, Characterization, Photophysical and Gelation Studies. Chemistry 2013; 19:9987-94. [DOI: 10.1002/chem.201301510] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2013] [Indexed: 11/07/2022]
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72
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Shao JY, Zhong YW. Monometallic osmium(II) complexes with bis(N-methylbenzimidazolyl)benzene or -pyridine: a comparison study with ruthenium(II) analogues. Inorg Chem 2013; 52:6464-72. [PMID: 23688019 DOI: 10.1021/ic400385b] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Seven bis-tridentate osmium complexes with Mebib or Mebip (Mebib is the 2-deprotonated form of 1,3-bis(N-methylbenzimidazolyl)benzene and Mebip is bis(N-methylbenzimidazolyl)pyridine) have been prepared, and their electrochemical and spectroscopic properties are compared with ruthenium structural analogues. Among them, four complexes have the [Os(NCN)(NNN)]-type coordination, including [Os(Mebib)(Mebip)](PF6)2 (1(PF6)2), [Os(dpb)(Mebip)](PF6) (2(PF6), dpb is the 2-deprotonated form of 1,3-di(pyrid-2-yl)benzene), [Os(Mebib)(ttpy)](PF6) (3(PF6), ttpy = 4'-tolyl-2,2':6',2"-terpyridine), and [Os(dpb)(ttpy)](PF6) (4(PF6)). The other three complexes are [Os(Mebip)2](PF6)2 (5(PF6)2), [Os(Mebip)(tpy)](PF6)2 (6(PF6)2, tpy = 2,2':6',2"-terpyridine), and [Os(ttpy)2](PF6)2 (7(PF6)2) with the [Os(NNN)(NNN)]-type coordination. Single crystals of 2(PF6) and 6(PF6)2 have been obtained, and their structures are studied by X-ray crystallographic analysis. The Os(II/III) redox potentials of 1(PF6)2 to 7(PF6)2 progressively increase from +0.04, +0.23, +0.24, +0.36, +0.56, +0.79 to +0.94 V vs Ag/AgCl, which are 200-300 mV less positive relative to the Ru(II/III) potentials of their ruthenium counterparts. The highest occupied molecular orbital energy levels of 1(+)-7(2+) are calculated to vary in a descending order. The ruthenium and osmium complexes have singlet metal-to-ligand charge-transfer (MLCT) transitions of similar energies and band shapes, while the osmium complexes display additional (3)MLCT transitions in the lower-energy region. Complexes 6(PF6)2 and 7(PF6)2 emit weakly at 780 and 740 nm, respectively. Complex 1(PF6)2 was synthesized as the oxidized Os(III) salt because of the low Os(II/III) potential. The transformation of 1(2+) to 1(+) by chemical reduction or electrolysis led to the emergence of the (1)MLCT transitions in the visible region.
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Affiliation(s)
- Jiang-Yang Shao
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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73
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Uahengo V, Zhou N, Xiong B, Cai P, Hu K, Cheng G. Synthesis and characterization of a new dinuclear platinum(II) alkynyl complex with a ferrocene bridge and its interaction with silver ion. J Organomet Chem 2013. [DOI: 10.1016/j.jorganchem.2013.02.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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74
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Lam ESH, Tsang DPK, Lam WH, Tam AYY, Chan MY, Wong WT, Yam VWW. Luminescent platinum(II) complexes of 1,3-bis(N-alkylbenzimidazol- 2'-yl)benzene-type ligands with potential applications in efficient organic light-emitting diodes. Chemistry 2013; 19:6385-97. [PMID: 23512802 DOI: 10.1002/chem.201203290] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2012] [Indexed: 11/11/2022]
Abstract
A series of luminescent platinum(II) complexes of tridentate 1,3-bis(N-alkylbenzimidazol-2'-yl)benzene (bzimb) ligands has been synthesized and characterized. One of these platinum(II) complexes has been structurally characterized by X-ray crystallography. Their electrochemical, electronic absorption, and luminescence properties have been investigated. Computational studies have been performed on this class of complexes to elucidate the origin of their photophysical properties. Some of these complexes have been utilized in the fabrication of organic light-emitting diodes (OLEDs) by using either vapor deposition or spin-coating techniques. Chloroplatinum(II)-bzimb complexes that are functionalized at the 5-position of the aryl ring, [Pt(R-bzimb)Cl], not only show tunable emission color but also exhibit high current and external quantum efficiencies in OLEDs. Concentration-dependent dual-emissive behavior was observed in multilayer OLEDs upon the incorporation of pyrenyl ligand into the Pt(bzimb) system. Devices doped with low concentrations of the complexes gave rise to white-light emission, thereby representing a unique class of small-molecule, platinum(II)-based white OLEDs.
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75
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Organometallic Complexes of Pyridines Together with Diverse Heterocycles as Ligands. ADVANCES IN HETEROCYCLIC CHEMISTRY 2013. [DOI: 10.1016/b978-0-12-407777-5.00002-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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76
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Roy A, Maiti M, Nayak RR, Roy S. Effect of amide hydrogen bonding on spontaneously formed gel-emulsions by two pyridyl carboxylic acid based amphiphiles, sodium salt of 2-dodecylpyridine-5-carboxylic acid and sodium salt of [2-dodecylpyridine-5-carboxylic]glycine: entrapment and release of vitamin B12. J Mater Chem B 2013; 1:5588-5601. [DOI: 10.1039/c3tb20970a] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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77
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Dong B, Maeda H. Ion-based materials comprising planar charged species. Chem Commun (Camb) 2013; 49:4085-4099. [DOI: 10.1039/c2cc34407f] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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78
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Lee SW, Kumpfer JR, Lin PA, Li G, Gao XPA, Rowan SJ, Sankaran RM. In Situ Formation of Metal Nanoparticle Composites via “Soft” Plasma Electrochemical Reduction of Metallosupramolecular Polymer Films. Macromolecules 2012. [DOI: 10.1021/ma301640d] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Seung Whan Lee
- Department
of Chemical Engineering, ‡Department of Macromolecular Science and Engineering, and §Department of
Physics, Case Western Reserve University, Cleveland, Ohio 44106, United States
| | - Justin R. Kumpfer
- Department
of Chemical Engineering, ‡Department of Macromolecular Science and Engineering, and §Department of
Physics, Case Western Reserve University, Cleveland, Ohio 44106, United States
| | - Pin Ann Lin
- Department
of Chemical Engineering, ‡Department of Macromolecular Science and Engineering, and §Department of
Physics, Case Western Reserve University, Cleveland, Ohio 44106, United States
| | - Guodong Li
- Department
of Chemical Engineering, ‡Department of Macromolecular Science and Engineering, and §Department of
Physics, Case Western Reserve University, Cleveland, Ohio 44106, United States
| | - Xuan P. A. Gao
- Department
of Chemical Engineering, ‡Department of Macromolecular Science and Engineering, and §Department of
Physics, Case Western Reserve University, Cleveland, Ohio 44106, United States
| | - Stuart J. Rowan
- Department
of Chemical Engineering, ‡Department of Macromolecular Science and Engineering, and §Department of
Physics, Case Western Reserve University, Cleveland, Ohio 44106, United States
| | - R. Mohan Sankaran
- Department
of Chemical Engineering, ‡Department of Macromolecular Science and Engineering, and §Department of
Physics, Case Western Reserve University, Cleveland, Ohio 44106, United States
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79
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Stengel I, Strassert CA, Plummer EA, Chien CH, De Cola L, Bäuerle P. Postfunctionalization of Luminescent Bipyridine PtII Bisacetylides by Click Chemistry. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201200061] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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80
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Chang KC, Lin JL, Shen YT, Hung CY, Chen CY, Sun SS. Synthesis and photophysical properties of self-assembled metallogels of platinum(II) acetylide complexes with elaborate long-chain pyridine-2,6-dicarboxamides. Chemistry 2012; 18:1312-21. [PMID: 22223183 DOI: 10.1002/chem.201103030] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2011] [Indexed: 11/07/2022]
Abstract
A series of platinum(II) acetylide complexes with elaborate long-chain pyridine-2,6-dicarboxamides was synthesized. These metal complexes are capable of immobilizing organic solvents to form luminescent metallogels through a combination of intermolecular hydrogen bonding, aromatic π-π, and van der Waals interactions. Fibrillar morphologies were identified by TEM for these metallogels. Unique photophysical properties associated with the sol-to-gel transition have been disclosed with luminescence enhancement at elevated temperatures, which is in sharp contrast to typical thermotropic organogels or metallogels reported in the literature. Such unusual luminescence enhancement is attributed to the increased degree of freedom at higher temperatures that results in the formation of favorable molecular aggregates in the excited state through enhanced aromatic π-π and metallophilic Pt(II)···Pt(II) interactions. Structurally similar Pt-bp3 is not able to gel any common organic solvents. The inability of Pt-bp3 to form gels illustrates the importance of gelation to the macroscopic photophysical properties; Pt-bp3 does not show emission enhancement at elevated temperatures due to its low tendency to form strong aggregates in the ground state.
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Affiliation(s)
- Kai-Chi Chang
- Institute of Chemistry, Academia Sinica, Taiwan, ROC
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81
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Kumpfer JR, Taylor SD, Connick WB, Rowan SJ. Vapochromic and mechanochromic films from square-planar platinum complexes in polymethacrylates. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm32160b] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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82
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Lam ESH, Tam AYY, Lam WH, Wong KMC, Zhu N, Yam VWW. Structure, photophysical properties and computational study of a highly luminescent mixed-metal platinum(ii)–silver(i) system. Potential building blocks for emissive supramolecular structures. Dalton Trans 2012; 41:8773-6. [DOI: 10.1039/c2dt30598d] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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83
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Yang WW, Zhong YW, Yoshikawa S, Shao JY, Masaoka S, Sakai K, Yao J, Haga MA. Tuning of Redox Potentials by Introducing a Cyclometalated Bond to Bis-tridentate Ruthenium(II) Complexes Bearing Bis(N-methylbenzimidazolyl)benzene or -pyridine Ligands. Inorg Chem 2011; 51:890-9. [DOI: 10.1021/ic2016885] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wen-Wen Yang
- Beijing National Laboratory
for Molecular Sciences, CAS Key Laboratory of Photochemistry, Institute
of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
| | - Yu-Wu Zhong
- Beijing National Laboratory
for Molecular Sciences, CAS Key Laboratory of Photochemistry, Institute
of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
| | - Shinpei Yoshikawa
- Department of Applied
Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551,
Japan
| | - Jiang-Yang Shao
- Beijing National Laboratory
for Molecular Sciences, CAS Key Laboratory of Photochemistry, Institute
of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
| | - Shigeyuki Masaoka
- Department
of Chemistry, Faculty of Science, Kyushu University, Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581,
Japan
| | - Ken Sakai
- Department
of Chemistry, Faculty of Science, Kyushu University, Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581,
Japan
| | - Jiannian Yao
- Beijing National Laboratory
for Molecular Sciences, CAS Key Laboratory of Photochemistry, Institute
of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
| | - Masa-aki Haga
- Department of Applied
Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551,
Japan
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84
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Fuertes S, Brayshaw SK, Raithby PR, Schiffers S, Warren MR. New C∧N∧C Bis-Cyclometalated Platinum(II) Complexes: Synthesis, Structures, and Photophysical Properties. Organometallics 2011. [DOI: 10.1021/om200589q] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Sara Fuertes
- Department of Chemistry, University of Bath, Bath BA2 7AY, United Kingdom
| | - Simon K. Brayshaw
- Department of Chemistry, University of Bath, Bath BA2 7AY, United Kingdom
| | - Paul R. Raithby
- Department of Chemistry, University of Bath, Bath BA2 7AY, United Kingdom
| | | | - Mark R. Warren
- Department of Chemistry, University of Bath, Bath BA2 7AY, United Kingdom
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85
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Po C, Tam AYY, Wong KMC, Yam VWW. Supramolecular Self-Assembly of Amphiphilic Anionic Platinum(II) Complexes: A Correlation between Spectroscopic and Morphological Properties. J Am Chem Soc 2011; 133:12136-43. [DOI: 10.1021/ja203920w] [Citation(s) in RCA: 206] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Charlotte Po
- 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
| | - Anthony Yiu-Yan Tam
- 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
| | - Keith Man-Chung Wong
- 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
- 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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86
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Wen HM, Wu YH, Xu LJ, Zhang LY, Chen CN, Chen ZN. Luminescent square-planar platinum(ii) complexes with tridentate 3-bis(2-pyridylimino)isoindoline and monodentate N-heterocyclic ligands. Dalton Trans 2011; 40:6929-38. [DOI: 10.1039/c1dt10385g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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87
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Boča M, Jameson RF, Linert W. Fascinating variability in the chemistry and properties of 2,6-bis-(benzimidazol-2-yl)-pyridine and 2,6-bis-(benzthiazol-2-yl)-pyridine and their complexes. Coord Chem Rev 2011. [DOI: 10.1016/j.ccr.2010.09.010] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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88
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Canty AJ, Sharma M. η1-Alkynyl Chemistry for the Higher Oxidation States of Palladium and Platinum. TOP ORGANOMETAL CHEM 2011. [DOI: 10.1007/978-3-642-17429-2_5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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89
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Tam AYY, Tsang DPK, Chan MY, Zhu N, Yam VWW. A luminescent cyclometalated platinum(ii) complex and its green organic light emitting device with high device performance. Chem Commun (Camb) 2011; 47:3383-5. [DOI: 10.1039/c0cc05538g] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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90
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Wang P, Leung CH, Ma DL, Yan SC, Che CM. Structure-based design of platinum(II) complexes as c-myc oncogene down-regulators and luminescent probes for G-quadruplex DNA. Chemistry 2010; 16:6900-11. [PMID: 20437426 DOI: 10.1002/chem.201000167] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A series of platinum(II) complexes with tridentate ligands was synthesized and their interactions with G-quadruplex DNA within the c-myc gene promoter were evaluated. Complex 1, which has a flat planar 2,6-bis(benzimidazol-2-yl)pyridine (bzimpy) scaffold, was found to stabilize the c-myc G-quadruplex structure in a cell-free system. An in silico G-quadruplex DNA model has been constructed for structure-based virtual screening to develop new Pt(II)-based complexes with superior inhibitory activities. By using complex 1 as the initial structure for hit-to-lead optimization, bzimpy and related 2,6-bis(pyrazol-3-yl)pyridine (dPzPy) scaffolds containing amine side-chains emerge as the top candidates. Six of the top-scoring complexes were synthesized and their interactions with c-myc G-quadruplex DNA have been investigated. The results revealed that all of the complexes have the ability to stabilize the c-myc G-quadruplex. Complex 3 a ([Pt(II)L2R](+); L2=2,6-bis[1-(3-piperidinepropyl)-1H-enzo[d]imidazol-2-yl]pyridine, R=Cl) displayed the strongest inhibition in a cell-free system (IC(50)=2.2 microM) and was 3.3-fold more potent than that of 1. Complexes 3 a and 4 a ([Pt(II)L3R](+); L3=2,6-bis[1-(3-morpholinopropyl)-1H-pyrazol-3-yl]pyridine, R=Cl) were found to effectively inhibit c-myc gene expression in human hepatocarcinoma cells with IC(50) values of approximately 17 microM, whereas initial hit 1 displayed no significant effect on gene expression at concentrations up to 50 microM. Complexes 3 a and 4 a have a strong preference for G-quadruplex DNA over duplex DNA, as revealed by competition dialysis experiments and absorption titration; 3 a and 4 a bind G-quadruplex DNA with binding constants (K) of approximately 10(6)-10(7) dm(3) mol(-1), which are at least an order of magnitude higher than the K values for duplex DNA. NMR spectroscopic titration experiments and molecular modeling showed that 4 a binds c-myc G-quadruplex DNA through an external end-stacking mode at the 3'-terminal face of the G-quadruplex. Intriguingly, binding of c-myc G-quadruplex DNA by 3 b is accompanied by an increase of up to 38-fold in photoluminescence intensity at lambda(max)=622 nm.
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Affiliation(s)
- Ping Wang
- Department of Chemistry and Open Laboratory of Chemical Biology of the Institute of Molecular Technology for Drug Discovery and Synthesis, The University of Hong Kong, Pokfulam Road, Hong Kong, PR China
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91
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Wang X, Goeb S, Ji Z, Castellano FN. Excited State Absorption Properties of Pt(II) Terpyridyl Complexes Bearing π-Conjugated Arylacetylides. J Phys Chem B 2010; 114:14440-9. [DOI: 10.1021/jp101528z] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Xianghuai Wang
- Department of Chemistry and Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403
| | - Sébastien Goeb
- Department of Chemistry and Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403
| | - Zhiqiang Ji
- Department of Chemistry and Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403
| | - Felix N. Castellano
- Department of Chemistry and Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403
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92
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Hijazi A, Walther ME, Besnard C, Wenger OS. Spectroscopy and photoredox properties of soluble platinum(II) alkynyl complexes. Polyhedron 2010. [DOI: 10.1016/j.poly.2009.10.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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93
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Wen HM, Wu YH, Fan Y, Zhang LY, Chen CN, Chen ZN. Spectroscopic and Luminescence Studies on Square-Planar Platinum(II) Complexes with Anionic Tridentate 3-Bis(2-pyridylimino)isoindoline Derivatives. Inorg Chem 2010; 49:2210-21. [DOI: 10.1021/ic902019s] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Hui-Min Wen
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter and Graduate School of CAS, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Yu-Hui Wu
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter and Graduate School of CAS, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Yang Fan
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter and Graduate School of CAS, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Li-Yi Zhang
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter and Graduate School of CAS, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Chang-Neng Chen
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter and Graduate School of CAS, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Zhong-Ning Chen
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter and Graduate School of CAS, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
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94
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Dang L, Lin Z, Marder TB. DFT Studies on the Carboxylation of Arylboronate Esters with CO2 Catalyzed by Copper(I) Complexes. Organometallics 2010. [DOI: 10.1021/om901047e] [Citation(s) in RCA: 107] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Li Dang
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, People's Republic of China
| | - Zhenyang Lin
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, People's Republic of China
| | - Todd B. Marder
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
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95
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Wang KW, Chen JL, Cheng YM, Chung MW, Hsieh CC, Lee GH, Chou PT, Chen K, Chi Y. Mono- versus Dinuclear Pt(II) 6-(5-Trifluoromethyl-Pyrazol-3-yl)-2,2′-Bipyridine Complexes: Synthesis, Characterization, and Remarkable Difference in Luminescent Properties. Inorg Chem 2010; 49:1372-83. [DOI: 10.1021/ic9011313] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kang-Wei Wang
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Jing-Lin Chen
- Department of Chemistry, National Tsing Hua University, Hsinchu 300, Taiwan
- School of Material and Chemistry Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi, 341000, China
| | - Yi-Ming Cheng
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Min-Wen Chung
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Cheng-Chih Hsieh
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Gene-Hsiang Lee
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Pi-Tai Chou
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Kellen Chen
- Department of Chemistry, National Tsing Hua University, Hsinchu 300, Taiwan
| | - Yun Chi
- Department of Chemistry, National Tsing Hua University, Hsinchu 300, Taiwan
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96
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Mathew I, Sun W. Photophysics in solution and Langmuir–Blodgett film and vapochromic behavior of the Pt(ii) 2,6-bis(N-alkylbenzimidazol-2′-yl)pyridine complexes with different alkyl chains and counter anions. Dalton Trans 2010; 39:5885-98. [DOI: 10.1039/b923203f] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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97
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Koshevoy IO, Karttunen AJ, Lin YC, Lin CC, Chou PT, Tunik SP, Haukka M, Pakkanen TA. Synthesis, photophysical and theoretical studies of luminescent silver(i)–copper(i) alkynyl-diphosphine complexes. Dalton Trans 2010; 39:2395-403. [DOI: 10.1039/b920856a] [Citation(s) in RCA: 28] [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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98
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From mono to polydentate azole and benzazole derivatives, versatile ligands for main group and transition metal atoms. Coord Chem Rev 2009. [DOI: 10.1016/j.ccr.2009.02.020] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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99
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Tam AYY, Wong KMC, Yam VWW. Unusual luminescence enhancement of metallogels of alkynylplatinum(II) 2,6-bis(N-alkylbenzimidazol-2'-yl)pyridine complexes upon a gel-to-sol phase transition at elevated temperatures. J Am Chem Soc 2009; 131:6253-60. [PMID: 19354251 DOI: 10.1021/ja900895x] [Citation(s) in RCA: 226] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of alkynylplatinum(II) complexes of 2,6-bis(N-alkylbenzimidazol-2'-yl)pyridine has been synthesized and characterized by (1)H NMR, IR, FAB mass spectrometry, and elemental analysis; the photophysical properties have also been investigated. All the complexes have been shown to exhibit interesting gelation properties. Scanning electron microscopy (SEM) of the xerogels showed a network of fibrous structures, typical of morphologies of organogels/metallogels. Interestingly, two of the complexes were found to show strong luminescence enhancement upon a gel-to-sol phase transition upon increasing the temperature. This unusual behavior is rarely encountered, as it represents a sharp contrast to that exhibited by other typical thermotropic organogels and metallogels reported so far. Variable-temperature UV-vis and luminescence spectroscopies were performed to probe the gel-to-sol phase transition. Concentration-dependent, variable-temperature, and time-resolved emission studies in dilute benzene solution have also been made to provide further insights into the spectroscopic origin in the sol forms. A quantitative treatment of the system based on the Birks scheme has been performed.
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Affiliation(s)
- Anthony Yiu-Yan Tam
- Centre for Carbon-Rich Molecular and Nano-Scale Metal-Based Materials Research, Department of Chemistry, and HKU-CAS Joint Laboratory on New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong
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