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Ang PL, Nguyen VH, Yip JHK. Hetero- and homoleptic binuclear gold(I)-thiolate and -halide complexes - ligand exchange kinetics and supramolecular structures. Dalton Trans 2022; 51:3081-3095. [PMID: 35113094 DOI: 10.1039/d1dt04245a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Heteroleptic and homoleptic binuclear Au(I) complexes [Au2(μ-PAnP)(SPh)(X)] (X = Cl- or Br-), [Au2(μ-PAnP)(SPh)2] and [Au2(μ-PAnP)(SPhCO2H)2] (SPh = benzenethiolate and SPhCO2H = 4-thiolatobenzoic acid) containing the bridging diphosphine, 9,10-bis(diphenylphosphino)anthracene (PAnP), were synthesized and characterized by single crystal X-ray diffraction. [Au2(μ-PAnP)(SPh)2] exists as a monomer in its crystals but [Au2(μ-PAnP)(SPhCO2H)2] polymerizes into zig-zag chains via intermolecular hydrogen bonding. [Au2(μ-PAnP)(SPh)(Cl)] forms cyclophane-like dimers of Ci symmetry in crystals via intermolecular aurophilic interactions (Au-Au distance = 3.3081(5) Å). Recrystallization of [Au2(μ-PAnP)(SPh)(Br)] invariably led to crystals composed of [Au2(μ-PAnP)(SPh)(Br)] and [Au2(μ-PAnP)(Br)2]. Despite the chemically different P atoms in the heteroleptic [Au2(μ-PAnP)(SPh)(Cl)] and [Au2(μ-PAnP)(SPh)(Br)], solutions of the complexes show only a single signal in their 31P{1H} NMR spectra at room temperature which resolved into two singlets of equal intensity at 183 K. Identical signals which show the same thermal behavior were observed in solutions of [Au2(μ-PAnP)(SPh)2] and [Au2(μ-PAnP)(X)2] in 1 : 1 molar ratios, indicating that there are three exchanging species, [Au2(μ-PAnP)(SPh)(X)], [Au2(μ-PAnP)(SPh)2] and [Au2(μ-PAnP)(X)2], in solution. A solution of [Au2(μ-PAnP)(Cl)2] and [Au2(μ-PAnP)(Br)2] in 1 : 1 molar ratio shows two singlets, implying that the exchange is not due to the dissociation of either PAnP or halide ligands, but rather it involves the exchange of the thiolate and the halide ligands (SPh- ↔ X-). A mixture of [(PPh3)Au(SPh)] and [(PPh3)Au(Cl)] (1 : 1 molar ratio) showed only one signal in its room temperature 31P{1H} NMR spectrum, indicating that the ligand exchange can happen intermolecularly. Self-exchange of SPh- ligands is possible as the room temperature 31P NMR spectrum of a mixture of [Au2(μ-PAnP)(SPh)2] and [Au2(μ-PAnP)(SPhCO2H)2] displayed only one signal. The rate constants of the exchange were determined by fitting the line shapes of the 31P NMR signals at different temperatures. The activation energies (Eas), obtained from Arrhenius plots, for the SPh- ↔ Cl- and SPh- ↔ Br- exchange are 36.9 ± 0.7 and 33.7 ± 1.0 kJ mol-1, respectively. The activation enthalpy and activation entropy, obtained from Eyring plots, for the SPh- ↔ Cl- and SPh- ↔ Br- exchange are 35.0 ± 0.7 kJ mol-1 and -25.7 ± 3.2 J K-1, and 32.0 ± 1.0 kJ mol-1 and -21.8 ± 4.7 J K-1, respectively. Based on the kinetic results, two possible mechanisms were proposed for the reactions.
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Affiliation(s)
- Pau Lin Ang
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore.
| | - Van Ha Nguyen
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore.
| | - John H K Yip
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore.
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Ang PL, Nguyen VH, Yip JHK. A dynamic tetranuclear gold(i)-cyclophane - gold(i)-centred chirality and fluxionality arising from an intramolecular shift of Au-S bonds. Dalton Trans 2021; 50:11422-11428. [PMID: 34346461 DOI: 10.1039/d1dt01984h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A tetranuclear gold(i) complex [Au4(μ-PAnP)2(μ-L)2] (PAnP = 9,10-bis(diphenylphosphino)anthracene and L = benzene-1,2-dithiolate) has been synthesized and characterised by multinuclear NMR and X-ray crystallography. The molecule has a cyclophane-like structure which can be considered to be composed of two [Au2(μ-PAnP)(μ-L)] units held together by Au-S bonds and aurophilic interactions (Au-Au = 3.0712(2) Å). L acts as a chelating and bridging ligand with one of its S atoms bonded to two Au ions as sulfonium ions and there are two Au2S2 cores on each side of the cyclophane. A sulfur atom in each Au2S2 core is a chiral sulfonium ion, being bonded to two chemically distinct Au ions. Two Au ions are bonded to four atoms (2S, P and Au) in an asymmetric environment, making them a rare example of gold(i)-centred chirality. The two Au2S2 cores have RAu, RS and SAu, SS configurations, and the chiralities of the sulfonium ion and the gold ion are correlated. Variable-temperature NMR spectroscopy showed that the metallacyclophane undergoes rapid exchange in solution. A bond shift mechanism involving simultaneous cleavage and formation of Au-S bonds is proposed for the exchange.
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Affiliation(s)
- Pau Lin Ang
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore.
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Gao Y, Yip JHK. Selective Hypochlorous Acid Detection by Electronic Tuning of Platinum–4,5-bis(diphenylphosphino)acridine–Thiolate Complexes. Inorg Chem 2019; 58:9290-9302. [DOI: 10.1021/acs.inorgchem.9b01009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yifei Gao
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - John H. K. Yip
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
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Wang Y, Ang PL, Wong CY, Yip JHK. Gold-Clip-Assisted Self-Assembly and Proton-Coupled Expansion-Contraction of a Cofacial Fe III -Porphyrin Cage. Chemistry 2018; 24:18623-18628. [PMID: 30218534 DOI: 10.1002/chem.201803501] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 09/11/2018] [Indexed: 01/10/2023]
Abstract
A molecular cage {Au8 (μ-PAnP)4 [Fe(H2 O)2 (TPyP)]2 (OTf)2 }(OTf)8 (1) composed of two cofacial FeIII -porphyrin can be self-assembled from the gold clip [Au2 (PAnP)Cl2 ] and Fe3+ (H2 O)2 (TPyP)+ (PAnP=9,10-bis(diphenylphosphino)anthracene, TPyP=meso-tetra(4-pyridyl)porphyrinato). The height of the cage is 8.579(3) Å. The addition of a base to a solution of the cage leads to a contracted and twisted cage {[Au8 (μ-PAnP)4 [Fe2 (μ-O)(TPyP)2 ]}(OTf)8 (2), which has a height of ≈4.4 Å and porphyrin-porphyrin torsional angle of ≈20°. The contracted cage can be synthesized independently from the gold clip and Fe2 (μ-O)(TPyP)2 . The spectroscopy and crystal structure of an unclipped analog of the contracted cage, {[AuPPh3 )8 [Fe2 (μ-O)(TPyP)2 ]}(OTf)8 (3), supports the DFT-calculated structure of 2. NMR and UV/Vis titrations show that the expansion-untwisting and contraction-twisting of the cage is reversible.
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Affiliation(s)
- Yuanyuan Wang
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Pau Lin Ang
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Chun-Yuen Wong
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China
| | - John H K Yip
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
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Affiliation(s)
- Van Ha Nguyen
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore
| | - Balamurugan Kandasamy
- Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR
| | - John H. K. Yip
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore
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Nguyen VH, Khoo RSH, Yip JHK. Ir(2-phenylpyridine)2(benzene-1,2-dithiolate) anion as a diastereoselective metalloligand and nucleophile: stereoelectronic effect, spectroscopy, and computational study of the methylated and aurated complexes and their oxygenation products. Inorg Chem 2015; 54:2264-77. [PMID: 25692396 DOI: 10.1021/ic502875y] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The anionic complex [Ir(2-phenylpyridine)2(benzene-1,2-dithiolate)](-) ([IrSS](-)) is a nucleophile and metalloligand that reacts with methyl iodide and AuPR3(+) (R = Ph or Et) to form S-methylated complexes (thiother-thiolate and dithiother complexes) and S-aurated complexes, respectively. The reactions are completely diastereselective, producing only the enantiomers ΛS and ΔR or ΛSS and ΔRR. The diastereoselectivity is stereoelectronically controlled by the orientation of the highest occupied molecular orbital (HOMO) of [IrSS](-) arising from filled dπ-pπ antibonding interactions, and the chirality of the iridium ion. Methylation or auration removes the high-energy lone pair of the thiolate S atom, leading to low-lying HOMOs composed mainly of the Ir d-orbital and the 2-phenylpyridine π (ppyπ) orbital. The methylated and aurated complexes can be oxidized by H2O2 or peracid to give sulfinate-thiother, disulfoxide, and sulfinate-sulfoxide complexes, and the oxygenation further stabilizes the HOMO. All the complexes are luminescent, and their electronic spectra are interpreted with the aid of time-dependent density functional theory calculations. The thiother-thiolate complex exhibits ligand(S)-to-ligand(π* of ppy)-charge-transfer/metal-to-ligand-charge-transfer absorption (LLCT/MLCT) and a relatively low-energy (3)LLCT/MLCT emission, while the other complexes display (3)ππ*/MLCT emissions.
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Affiliation(s)
- Van Ha Nguyen
- Department of Chemistry, National University of Singapore , 3 Science Drive 3, Singapore, 117543
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Nguyen VH, Chew HQ, Su B, Yip JHK. Synthesis and Spectroscopy of Anionic Cyclometalated Iridium(III)-Dithiolate and -Sulfinates—Effect of Sulfur Dioxygenation on Electronic Structure and Luminescence. Inorg Chem 2014; 53:9739-50. [DOI: 10.1021/ic501278n] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Van Ha Nguyen
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Hui Qi Chew
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Bochao Su
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - John H. K. Yip
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
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Nguyen MH, Nguyen VH, Yip JHK. Sequence-Specific Synthesis of Platinum-Conjugated Trichromophoric Energy Cascades of Anthracene, Tetracene, and Pentacene and Fluorescent “Black Chromophores”. Organometallics 2013. [DOI: 10.1021/om400578t] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Minh-Hai Nguyen
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543
| | - Van Ha Nguyen
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543
| | - John H. K. Yip
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543
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Nguyen MH, Wong CY, Yip JHK. Ligand Perturbations on Fluorescence of Dinuclear Platinum Complexes of 5,12-Diethynyltetracene: A Spectroscopic and Computational Study. Organometallics 2013. [DOI: 10.1021/om300904b] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Minh-Hai Nguyen
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Chun-Yuen Wong
- Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong
Kong SAR, People’s Republic of China
| | - John H. K. Yip
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
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Affiliation(s)
- Minh-Hai Nguyen
- Department of Chemistry, National University of Singapore, 3
Science Drive 3, Singapore 117543
| | - John H. K. Yip
- Department of Chemistry, National University of Singapore, 3
Science Drive 3, Singapore 117543
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Affiliation(s)
- Minh-Hai Nguyen
- Department of Chemistry, National University of Singapore, 3
Science 3 Drive, Singapore, 117543
| | - John H. K. Yip
- Department of Chemistry, National University of Singapore, 3
Science 3 Drive, Singapore, 117543
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Hu J, Nguyen MH, Yip JHK. Metallacyclophanes of 1,6-Bis(diphenylphosphino)pyrene: Excimeric Emission and Effect of Oxygen on Stability of the Rings. Inorg Chem 2011; 50:7429-39. [DOI: 10.1021/ic102441b] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Jian Hu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Minh-Hai Nguyen
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - John H. K. Yip
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
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Nguyen MH, Yip JHK. Gold(I) and Platinum(II) Tetracenes and Tetracenyldiacetylides: Structural and Fluorescence Color Changes Induced by σ-Metalation. Organometallics 2010. [DOI: 10.1021/om100046h] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Minh-Hai Nguyen
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - John H. K. Yip
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
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Hu J, Xu H, Nguyen MH, Yip JHK. Photooxidation of a platinum-anthracene pincer complex: formation and structures of Pt(II)-anthrone and -ketal complexes. Inorg Chem 2010; 48:9684-92. [PMID: 19817495 DOI: 10.1021/ic900479w] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Irradiating the cyclometalated pincer complex Pt(II)(DPA)Cl (1, DPA = 1,8-bis(diphenylphosphino)anthracene) in the presence of O(2) led to three sequential oxidations of the anthracenyl ring. The first photoproduct, a Pt(II)-9,10-endoperoxide complex, was converted photochemically to a Pt(II)-9-hydroxyanthrone complex A which was further oxygenated to a Pt(II)-hemiketal (B). The oxidation of A, which could be accelerated by light irradiation, probably involved a Pt(II)-anthraquinone intermediate. B underwent acid-catalyzed ketalization to form a binuclear Pt(II)(2)-diketal (B1). The photolysis was followed by UV-vis absorption and NMR spectroscopy, and the structures of A and B1 were characterized by single crystal X-ray diffraction.
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Affiliation(s)
- Jian Hu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 11754
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Ng Z, Loh KP, Li L, Ho P, Bai P, Yip JHK. Synthesis and electrical characterization of oligo(phenylene ethynylene) molecular wires coordinated to transition metal complexes. ACS Nano 2009; 3:2103-14. [PMID: 19639949 DOI: 10.1021/nn900570v] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Organometallic wires are interesting alternatives to conventional molecular wires based on a pure organic system because of the presence of d orbitals in the transition metal complex. However, synthetic problems, such as decreased stability of the compounds when labile metal complexes are present, often impede their isolation in a pure state and preclude a rapid development of such hybrid molecular wires. In this work, we show that preassembled self-assembled monolayers (SAM) based on pyridine-terminated 1-((4-acetylthiophenyl)ethynyl)-4-((4-pyridyl)ethynyl)benzene can act as a template for the architectural build up of a second layer of transition metal complexes to form an array of organometallic molecular wires on gold. Ru(II)(terpy)(bipy)(2+) (terpy = 2,2':6',2''-terpyridine and bipy = 2,2'-bipyridine) or cyclometalated Pt(II)(pbipy) (pbipy = 6-phenyl-2,2'-bipyridine) were axially coordinated onto the organic SAM via its terminal pyridinium moieties. Current-voltage studies show that the electronic coupling between the transition metal and organic wire produces a molecular wire that exhibits higher conductance than the original organic chain. The presence of the transition metal complexes in the hybrid molecular wire introduces distinctive negative differential resistance (NDR) effects.
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Affiliation(s)
- Zhaoyue Ng
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
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Affiliation(s)
- Jian Hu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543
| | - John H. K. Yip
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543
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Affiliation(s)
- Jian Hu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, and Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, People’s Republic of China
| | - John H. K. Yip
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, and Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, People’s Republic of China
| | - Dik-Lung Ma
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, and Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, People’s Republic of China
| | - Kwok-Yin Wong
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, and Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, People’s Republic of China
| | - Wai-Hong Chung
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, and Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, People’s Republic of China
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Affiliation(s)
- Wendy Yuqing Heng
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Jian Hu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - John H. K. Yip
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
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Hu J, Lin R, Yip JHK, Wong KY, Ma DL, Vittal JJ. Synthesis and Electronic Spectroscopy of Luminescent Cyclometalated Platinum−Anthracenyl Complexes. Organometallics 2007. [DOI: 10.1021/om700706r] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jian Hu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, and Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, People’s Republic of China
| | - Ronger Lin
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, and Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, People’s Republic of China
| | - John H. K. Yip
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, and Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, People’s Republic of China
| | - Kwok-Yin Wong
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, and Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, People’s Republic of China
| | - Dik-Lung Ma
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, and Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, People’s Republic of China
| | - Jagadese J. Vittal
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, and Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, People’s Republic of China
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Zhang K, Hu J, Chan KC, Wong KY, Yip JHK. Synthesis, Structures, and Electronic Spectroscopy of Luminescent Acetylene- and (Buta-1,3-diyne)platinum Complexes. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200600773] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Abstract
Reactions of 9,10-bis(diphenylphosphino)anthracene (PAnP) and AgX (X = OTf-, ClO4-, PF6-, and BF4-) led to luminescent Ag-PAnP complexes with rich structural diversity. Helical polymers [Ag(mu-PAnP)(CH3CN)X]n (X = OTf-, ClO4-, and PF6-) and discrete binuclear [Ag2(mu-PAnP)2(CH3CN)4](PF6)2, trinuclear [Ag3(mu-PAnP)3 supersetBF4](BF4)2, and tetranuclear [Ag4(mu-PAnP)4 superset(ClO4)2](ClO4)2 metallacycles were isolated from different solvents. The tri- and tetranuclear metallacycles exhibited novel puckered-ring and saddlelike structures. Variable-temperature (VT) 31P{1H}-NMR spectroscopy of the complexes was solvent dependent. The dynamics in CD3CN involve two species, but the exchange processes in CD2Cl2 are more complicated. A ring-opening polymerization was proposed for the exchange mechanism in CD3CN.
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Affiliation(s)
- Ronger Lin
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 11754, Singapore
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Abstract
A luminescent molecular rectangle [Au(4)(micro-PAnP)(2)(micro-bipy)(2)](OTf)(4) (1.(OTf)(4)) (PAnP = 9,10-bis(diphenylphosphino)anthracene, bipy = 4,4'-bipyridine, X = NO(3)(-) or OTf(-)), synthesized from the self-assembly of the molecular "clip" Au(2)(micro-PAnP)(OTf)(2) and bipy, shows a large rectangular cavity of 7.921(3) x 16.76(3) A. The electronic absorption and emission spectroscopy, and electrochemistry of the metallacyclophane, have been studied. The 1(4+) ions are self-assembled into 2D mosaic in the solid state via complementary edge-to-face interactions between the Ph groups. (1)H NMR titrations ratify the 1:1 complexation between 1(4+) and various aromatic molecules. Comparing the structures of the inclusion complexes indicates an induced-fit mechanism operating in the binding. The emission of 1(4+) is quenched upon the guest binding. The binding constants are determined by both (1)H NMR and fluorescence titrations. Solvophobic and ion-dipole effects are shown to be important in stabilizing the inclusion complexes.
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Affiliation(s)
- Ronger Lin
- Department of Chemistry, The National University of Singapore, 10 Kent Ridge Crescent, 119260, Singapore
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Abstract
Tetranuclear [Cu(4)mu(2)-dppm)(3)(mu(2)-mu(2)-NS(2))(mu(2)-mu(4)-NS(2))] (1) and pentanuclear [Cu(5)(mu(2)-dppm)(4)(mu(3)-mu-(3)-NS(2))(2)]PF(6) (2.PF(6)) (dppm = bis(diphenylphoshino)methane, NS(2)(2)(-) = 1,8-naphthalenedithiolate) were synthesized from the reactions between NS(2)(2)(-) and [Cu(2)(mu(2)-dppm)(2)(CH(3)CN)(2)](PF(6))(2). Compound 1 features a square Cu(4) core capped by a 5-coordinate S atom while 2.PF(6) exhibits an unprecedented square planar Cu(5) core. Both complexes display dual emissions at 480 and 620 nm which arise from ligand-centered npi and ligand-metal charge-transfer excited states, respectively.
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Affiliation(s)
- Huan Xu
- Department of Chemistry, The National University of Singapore, 10 Kent Ridge Crescent, 119269, Singapore
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Abstract
Novel {[(mu-PAnP)(AuX)2]2Ag}+SbF6- halonium ions (X = Cl, Br; PAnP = 9,10-bis(diphenylphosphino)anthracene) were synthesized from the reactions between (mu-PAnP)(AuX)2 and 1/2 mol equiv of AgSbF6. The compounds feature an unprecedented distorted Au4X4 dodecahedron which encapsulates a silver(I) ion at its center. The halonium ions are stabilized by collective actions of metallophilic Au-Ag, aromatic pi-pi, and Ag-X interactions.
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Affiliation(s)
- Ke Zhang
- Department of Chemistry, The National University of Singapore, 10 Kent Ridge Crescent, 119260, Singapore
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Yip JHK, Wu J, Wong KY, Yeung KW, Vittal JJ. Syntheses, Structures, and Electrochemistry of Polynuclear CuI, AgI, and PtII Complexes Bearing Ferrocenyl Group. Organometallics 2002. [DOI: 10.1021/om010998m] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- John H. K. Yip
- Department of Chemistry, The National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, and Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, People's Republic of China
| | - Jianguo Wu
- Department of Chemistry, The National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, and Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, People's Republic of China
| | - Kwok-Yin Wong
- Department of Chemistry, The National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, and Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, People's Republic of China
| | - Kin-Wai Yeung
- Department of Chemistry, The National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, and Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, People's Republic of China
| | - Jagadese J. Vittal
- Department of Chemistry, The National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, and Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, People's Republic of China
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Muthu S, Yip JHK, Vittal JJ. Coordination networks of Ag(i) and N,N′- bis(3-pyridinecarboxamide)-1,6-hexane: structures and anion exchange. ACTA ACUST UNITED AC 2002. [DOI: 10.1039/b206680g] [Citation(s) in RCA: 191] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Yip JHK, Prabhavathy J. A Luminescent Gold Ring That Flips Like Cyclohexane This work was supported by the National University of Singapore. We thank Dr. Leong Weng Kee and Dr. Richard Wong for helpful discussion and Dr. Jagadese J. Vittal and Ms. G. K. Tan for determining the X-ray crystal structures. Angew Chem Int Ed Engl 2001; 40:2159-2162. [PMID: 11433475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Affiliation(s)
- John H. K. Yip
- Department of Chemistry The National University of Singapore 10 Kent Ridge Crescent, 119260 (Singapore)
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Yip JHK, Feng R, Vittal JJ. {[AuL(2)](+)[LAuCl][AuCl(2)](-)} (L = 2-Aminopyridine): A Trinuclear Gold(I) Unit in the Pattern [+ Neutral -]. Inorg Chem 1999; 38:3586-3589. [PMID: 11671109 DOI: 10.1021/ic990230i] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- John H. K. Yip
- Department of Chemistry, The National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260
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