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Zhang Q, Zhang W, Rajendran NM, Liang T, Sun WH. Thermo-enhanced ring-opening polymerization of ε-caprolactone: the synthesis, characterization, and catalytic behavior of aluminum hydroquinolin-8-olates. Dalton Trans 2017; 46:7833-7843. [PMID: 28594017 DOI: 10.1039/c7dt01720k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of highly sensitive aluminum hydroquinolin-8-olates (C1-C8) was synthesized and characterized by 1H/13C NMR spectroscopy. The molecular structures of compounds C1, C3, C4, and C5 were confirmed by single crystal X-ray crystallography and demonstrated the binuclear form. In the presence of BnOH, all the aluminum complexes exhibited moderate to high activities towards the ring-opening polymerization of ε-CL at high temperatures, but quite low activities at ambient temperature. Microstructure analysis of the resultant polycaprolactones showed that the polymers were linear in nature with a BnO- end group. In addition, the mechanism was investigated by monitoring the 1H NMR and 27Al NMR of C1 and these results suggested that the complexes existed as dimeric species at low temperature and partly converted into active mononuclear species at higher temperatures, which was easily coordinated by BnOH to afford the active species for the ring-opening polymerization of ε-caprolactone.
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Affiliation(s)
- Qiurui Zhang
- School of Materials Science and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China. and Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. and CAS Research/Education Center for Excellence in Molecular Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wenjuan Zhang
- School of Materials Science and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China.
| | | | - Tongling Liang
- Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
| | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. and CAS Research/Education Center for Excellence in Molecular Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
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2
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Huang BH, Tsai CY, Chen CT, Ko BT. Metal complexes containing nitrogen-heterocycle based aryloxide or arylamido derivatives as discrete catalysts for ring-opening polymerization of cyclic esters. Dalton Trans 2016; 45:17557-17580. [DOI: 10.1039/c6dt03384a] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
This perspective highlights some recent advances in the field of discrete N-heterocyclic aryloxide/arylamido metal complexes for ROP of lactones.
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Affiliation(s)
- Bor-Hunn Huang
- Department of Chemistry
- National Chung Hsing University
- Taichung 402
- Taiwan
| | - Chen-Yen Tsai
- Department of Chemistry
- National Chung Hsing University
- Taichung 402
- Taiwan
| | - Chi-Tien Chen
- Department of Chemistry
- National Chung Hsing University
- Taichung 402
- Taiwan
| | - Bao-Tsan Ko
- Department of Chemistry
- National Chung Hsing University
- Taichung 402
- Taiwan
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3
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Cai Y, Samedov K, Dolinar BS, Albright H, Song Z, Zhang C, Tang BZ, West R. AEE-active cyclic tetraphenylsilole derivatives with ∼100% solid-state fluorescence quantum efficiency. Dalton Trans 2015; 44:12970-5. [PMID: 26119483 DOI: 10.1039/c5dt01846c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Two new strongly AEE active (I/I0 ≈ 94) tetraphenylsilole-containing cyclosiloxanes with cyan emissions (λem = 500 nm) and ∼100% solid state fluorescence quantum yields are reported. The intra- and intermolecular C-Hπ interactions in the crystal play a major role in the observed high solid state fluorescence quantum yields.
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Affiliation(s)
- Yuanjing Cai
- School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, People's Republic of China.
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4
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Pusztai E, Jang S, Toulokhonova IS, Guzei IA, West R, Hu R, Tang BZ. Synthesis of Highly Fluorescent Diquinaldinatoalumino Silole Derivatives. Chemistry 2013; 19:8742-5. [DOI: 10.1002/chem.201300728] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2013] [Indexed: 11/11/2022]
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5
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Wang X, Wang C, Zhao H. Errors in the calculation of (27)Al nuclear magnetic resonance chemical shifts. Int J Mol Sci 2012; 13:15420-46. [PMID: 23203134 PMCID: PMC3509650 DOI: 10.3390/ijms131115420] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Revised: 11/02/2012] [Accepted: 11/06/2012] [Indexed: 11/29/2022] Open
Abstract
Computational chemistry is an important tool for signal assignment of 27Al nuclear magnetic resonance spectra in order to elucidate the species of aluminum(III) in aqueous solutions. The accuracy of the popular theoretical models for computing the 27Al chemical shifts was evaluated by comparing the calculated and experimental chemical shifts in more than one hundred aluminum(III) complexes. In order to differentiate the error due to the chemical shielding tensor calculation from that due to the inadequacy of the molecular geometry prediction, single-crystal X-ray diffraction determined structures were used to build the isolated molecule models for calculating the chemical shifts. The results were compared with those obtained using the calculated geometries at the B3LYP/6-31G(d) level. The isotropic chemical shielding constants computed at different levels have strong linear correlations even though the absolute values differ in tens of ppm. The root-mean-square difference between the experimental chemical shifts and the calculated values is approximately 5 ppm for the calculations based on the X-ray structures, but more than 10 ppm for the calculations based on the computed geometries. The result indicates that the popular theoretical models are adequate in calculating the chemical shifts while an accurate molecular geometry is more critical.
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Affiliation(s)
- Xianlong Wang
- Center of Bioinformatics, University of Electronic Science and Technology of China, No. 4, 2nd Section, Jianshe Road, Chengdu 610054, China; E-Mails: (C.W.); (H.Z.)
- Department of Chemistry, Bryn Mawr College, 101 North Merion Avenue, Bryn Mawr, PA 19010, USA
| | - Chengfei Wang
- Center of Bioinformatics, University of Electronic Science and Technology of China, No. 4, 2nd Section, Jianshe Road, Chengdu 610054, China; E-Mails: (C.W.); (H.Z.)
| | - Hui Zhao
- Center of Bioinformatics, University of Electronic Science and Technology of China, No. 4, 2nd Section, Jianshe Road, Chengdu 610054, China; E-Mails: (C.W.); (H.Z.)
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Bakewell C, Platel RH, Cary SK, Hubbard SM, Roaf JM, Levine AC, White AJP, Long NJ, Haaf M, Williams CK. Bis(8-quinolinolato)aluminum ethyl complexes: Iso-Selective Initiators for rac-Lactide Polymerization. Organometallics 2012. [DOI: 10.1021/om300307t] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Clare Bakewell
- Department of Chemistry, Imperial College London, London SW7 2AZ, U.K
| | - Rachel H. Platel
- Department of Chemistry, Imperial College London, London SW7 2AZ, U.K
| | - Samantha K. Cary
- Center for Natural
Sciences, Ithaca College,
Ithaca, New York 14850, United States
| | - Steven M. Hubbard
- Center for Natural
Sciences, Ithaca College,
Ithaca, New York 14850, United States
| | - Joshua M. Roaf
- Center for Natural
Sciences, Ithaca College,
Ithaca, New York 14850, United States
| | - Alex C. Levine
- Center for Natural
Sciences, Ithaca College,
Ithaca, New York 14850, United States
| | | | - Nicholas J. Long
- Department of Chemistry, Imperial College London, London SW7 2AZ, U.K
| | - Michael Haaf
- Center for Natural
Sciences, Ithaca College,
Ithaca, New York 14850, United States
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Sun WH, Shen M, Zhang W, Huang W, Liu S, Redshaw C. Methylaluminium 8-quinolinolates: synthesis, characterization and use in ring-opening polymerization (ROP) of ε-caprolactone. Dalton Trans 2011; 40:2645-53. [DOI: 10.1039/c0dt01207f] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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Gahungu G, Zhang J, Ntakarutimana V, Gahungu N. Combined effects of one 8-hydroxyquinoline/picolinate and "CH"/N substitutions on the geometry, electronic structure and optical properties of mer-Alq(3). J Phys Chem A 2010; 114:652-8. [PMID: 19904976 DOI: 10.1021/jp9082773] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
With the aim of evaluating the combined effect of one 8-hydroxyquinoline (q)/picolinate (p) and "CH"/N substitutions on the molecular geometry, electronic structure, and optical properties of tris-(8-hydroxyquinoline)aluminum [Alq(3)], the density functional theory (B3LYP) and time-dependent density functional theory (TD-B3LYP), using the 6-31G(d) and 3-21+G(d,p) basis sets were applied on Alq(3), Alq(2)p, and its "CH"/N-substitution derivatives. A comparison of the optimized ground-state (S(0)) geometries has shown that the molecular shape is conserved upon such a substitution. On the basis of the frontier molecular orbital and gap energy (E(g)) calculations, it was shown that, comparatively to the pristine Alq(2)p (and to the original parent Alq(3)), the HOMO and LUMO are stabilized, the net effect being an increasing or a decreasing E(g), depending on the position of the substituted group. The substitution of q(B) by p (from Alq(3) to Alq(2)p) was also found to induce the same feature. Starting from the S(0) and S(1) (first excited state) geometries, the effect of the substitution on the absorption (and emission) spectra was evaluated. It was found that the "CH"/N substitution in different positions on the two 8-hydroxyquinoline ligands may also constitute an efficient approach of tuning the Alq(2)p emitting color. In comparison with both Alq(3) and Alq(2)p, an important blue shift was predicted for the 5-substituted derivative, an important red shift being observed for the 4-substituted one. Also, relatively significant blue and red shifts were predicted for the 7- and 2-substituted derivatives. Finally, revisiting the correlation between the spectrum shifts and the metal-ligand bonding, our recent findings (2) were confirmed.
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Affiliation(s)
- Godefroid Gahungu
- Departement de Chimie, Faculté des Sciences, Universite du Burundi, BP 2700 Bujumbura, Burundi.
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Iijima T, Kuroda SI, Yamamoto T. Main-Chain-Type 8-Quinolinol Polymers: Synthesis, Optical Properties, and Complex Formation with Metals. Macromolecules 2008. [DOI: 10.1021/ma0718999] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Takayuki Iijima
- Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, and Faculty of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu-shi, Gunma, 376-8515, Japan
| | - Shin-ichi Kuroda
- Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, and Faculty of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu-shi, Gunma, 376-8515, Japan
| | - Takakazu Yamamoto
- Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, and Faculty of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu-shi, Gunma, 376-8515, Japan
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Fazaeli Y, Amini MM, Gao S, Ng SW. 8-Hydroxy-2-methylquinoline. Acta Crystallogr Sect E Struct Rep Online 2007; 64:o97. [PMID: 21200973 PMCID: PMC2915051 DOI: 10.1107/s1600536807063246] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2007] [Accepted: 11/26/2007] [Indexed: 11/16/2022]
Abstract
The asymmetric unit of the title compound, C10H9NO, contains two independent molecules which are linked by a pair of O—H⋯N hydrogen bonds into a hydrogen-bonded dimer.
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