1
|
Al-Busaidi IJ, Ilmi R, Dutra JDL, Oliveira WF, Haque A, Al Rasbi NK, Marken F, Raithby PR, Khan MS. Utilization of a Pt(ii) di-yne chromophore incorporating a 2,2'-bipyridine-5,5'-diyl spacer as a chelate to synthesize a green and red emitting d-f-d heterotrinuclear complex. Dalton Trans 2021; 50:1465-1477. [PMID: 33439190 DOI: 10.1039/d0dt04198j] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new heterotrinuclear (d-f-d) complex [Eu(btfa)31c] (btfa = 4,4,4-trifluoro-1-phenyl-1,3-butanedione and 1c = [(Ph)(Et3P)2Pt-C[triple bond, length as m-dash]C-R-C[triple bond, length as m-dash]C-Pt(Et3P)2(Ph)] (R = 2,2'-bipyridine-5,5'-diyl) has been synthesized by utilizing the N,N-donor sites of the organometallic chromophore. The complex was characterized by analytical and spectroscopic methods. Photophysical properties of the complex were analysed in detail using both steady-state and time-resolved emission and excitation spectroscopy. The optical absorption spectrum of the complex is dominated by the spin allowed π-π* transitions of the btfa and 1c units in the UV-visible region (200-418 nm) and thus is excitable over a wide range of wavelengths across the UV into the visible region of the electromagnetic spectrum. The complex displays typical red Eu(iii) emission when excited at 345 nm. However, it also shows green emission when excited at 464 nm and, thus could be an interesting candidate for full colour display applications. The change in the colour could be a result of the high value of the energy back-transfer rate (6.73 × 105 s-1) from the triplet state of the organometallic chromophore to the 5D1 state of Eu(iii). Judd-Ofelt (J-O) intensity parameters (Ω2 and Ω4), radiative (AR), non-radiative (AR) decay rates and intrinsic quantum yield (Q) have been calculated.
Collapse
Affiliation(s)
| | - Rashid Ilmi
- Department of Chemistry, Sultan Qaboos University, P.O. Box 36, Al Khoud 123, Oman.
| | - José D L Dutra
- Pople Computational Chemistry Laboratory, Department of Chemistry, UFS, 49100-000 São Cristóvão, Sergipe, Brazil
| | - Willyan F Oliveira
- Pople Computational Chemistry Laboratory, Department of Chemistry, UFS, 49100-000 São Cristóvão, Sergipe, Brazil
| | - Ashanul Haque
- Department of Chemistry, Sultan Qaboos University, P.O. Box 36, Al Khoud 123, Oman. and Department of Chemistry, College of Science, University of Hail, Ha'il 81451, Kingdom of Saudi Arabia
| | - Nawal K Al Rasbi
- Department of Chemistry, Sultan Qaboos University, P.O. Box 36, Al Khoud 123, Oman.
| | - Frank Marken
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK.
| | - Paul R Raithby
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK.
| | - Muhammad S Khan
- Department of Chemistry, Sultan Qaboos University, P.O. Box 36, Al Khoud 123, Oman.
| |
Collapse
|
2
|
Qiu Y, Feng Y, Zhao Q, Wang H, Guo Y, Qiu D. White light emission from a green cyclometalated platinum(ii) terpyridylphenylacetylide upon titration with Zn(ii) and Eu(iii ). Dalton Trans 2020; 49:11163-11169. [PMID: 32747881 DOI: 10.1039/d0dt02336a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The cyclometalated Pt(ii) acetylide derivative with a 1,3-bis(N-octyl-benzimidazol-2-yl)benzene (N^C^N) ligand and a free terpyridine (TPY) receptor has been successfully synthesized and characterized. X-ray crystallography shows its inefficient conjugation degree between the [(N^C^N)Pt] and TPY planes. This bifunctional complex shows an enhanced 1MLCT/LLCT absorption band (ε = 3.30 × 104 dm3 mol-1 cm-1) centered at λmax = 365 nm, and the well-resolved vibronic-structured 3MLCT/LLCT emission bands (Φ = 0.08, τ = 3.43 μs) in the range of ca. 475-700 nm. Consecutive titrations show that added Zn2+ and Eu(HFA)3 bond to its free TPY receptor with 1 : 2 and 1 : 1 stoichiometry to form the heterotrinuclear Pt-Zn-Pt (Ka = 3.48 × 104 mol-1 dm3) and heterodinuclear Pt-Eu (Ka = 1.73 × 104 mol-1 dm3) complexes, respectively. A sensitizing effect of Zn2+ on the TPY unit, and the incomplete d → f energy transfer from the [(N^C^N)Pt(ii)] antenna donor to the Eu(iii) center with maximum efficiency of 51.8% are observed. Using an in situ mixed titration strategy, the R/G/B emission triads consisted of red [(TPY)Eu(HFA)3] and green [(N^C^N)Pt(ii)] dual phosphorescence and blue [(TPY)Zn(TPY)] fluorescence, which can be well balanced to realize the white-light-emission with CIE coordinates (x = 0.36, y = 0.36) by precisely controlling the molar ratio (9 : 1 : 2) of the parent complexes, Eu(HFA)3 and Zn(ClO4)2.
Collapse
Affiliation(s)
- Yuqing Qiu
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou City, Henan Province 450001, P. R. China
| | - Yuquan Feng
- College of Chemistry and Pharmacy Engineering, Nanyang Normal University, Nanyang City, Henan Province 473061, P. R. China.
| | - Qian Zhao
- College of Chemistry and Pharmacy Engineering, Nanyang Normal University, Nanyang City, Henan Province 473061, P. R. China.
| | - Hongwei Wang
- College of Chemistry and Pharmacy Engineering, Nanyang Normal University, Nanyang City, Henan Province 473061, P. R. China.
| | - Yingchen Guo
- College of Chemistry and Pharmacy Engineering, Nanyang Normal University, Nanyang City, Henan Province 473061, P. R. China.
| | - Dongfang Qiu
- College of Chemistry and Pharmacy Engineering, Nanyang Normal University, Nanyang City, Henan Province 473061, P. R. China.
| |
Collapse
|
3
|
Etchells IM, Pfrunder MC, Williams JAG, Moore EG. Quantification of energy transfer in bimetallic Pt(ii)-Ln(iii) complexes featuring an N^C^N-cyclometallating ligand. Dalton Trans 2019; 48:2142-2149. [PMID: 30667429 DOI: 10.1039/c8dt04640a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Cyclometallated Pt(ii) complexes with arylpolypyridyl ligands have impressive photophysical properties (high quantum yields, long lifetimes and tuneable emission) which can be readily tuned by modification of the organic ligand. Despite this, few examples of cyclometallated Pt(ii) complexes as sensitisers for Ln(iii) emission have been reported. Herein, we report the photophysical properties for a series of bimetallic complexes incorporating an N^C^N-coordinated Pt(ii) bearing an alkynyl terpyridine as a metalloligand for a Ln(iii) ion (where Ln = Nd, Gd, Er, Yb and Lu). Using a combination of steady state, time-resolved, and transient absorption experiments, the influence on the photophysical properties of the metalloligand exerted by the different Ln(iii) cations has been investigated, together with the energy transfer efficiency from the metalloligand to the Ln(iii) 4f* excited state.
Collapse
Affiliation(s)
- Isaac M Etchells
- School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, QLD 4072, Australia.
| | | | | | | |
Collapse
|
4
|
Yuan W, Zhang Y, Li H, Ren Q, Cheng Y. Efficient photoluminescence from the encumbered platinum(II) porphyrins. INORG CHEM COMMUN 2014. [DOI: 10.1016/j.inoche.2014.04.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
5
|
Xu HB, Deng JG, Kang B. Designed synthesis and photophysical properties of multifunctional hybrid lanthanide complexes. RSC Adv 2013. [DOI: 10.1039/c3ra40513c] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
|
6
|
Smith PA, Crawford C, Beedoe N, Assefa Z, Sykora RE. Synthesis, Crystal Structures, and Dual Donor Luminescence Sensitization in Novel Terbium Tetracyanoplatinates. Inorg Chem 2012; 51:12230-41. [DOI: 10.1021/ic3013975] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Philip A. Smith
- Department of Chemistry, University of South Alabama, Mobile, Alabama 36688,
United States
| | - Carlos Crawford
- Department of Chemistry, North Carolina A&T State University, Greensboro, North Carolina 27411, United States
| | - Nuquie Beedoe
- Department of Chemistry, North Carolina A&T State University, Greensboro, North Carolina 27411, United States
| | - Zerihun Assefa
- Department of Chemistry, North Carolina A&T State University, Greensboro, North Carolina 27411, United States
| | - Richard E. Sykora
- Department of Chemistry, University of South Alabama, Mobile, Alabama 36688,
United States
| |
Collapse
|