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Ahmed N, Asif S, Arfan M, Mahmood Q, Islam A, Gatasheh MK, Zia M. Synthesis and Characterization of Short α and β-Mixed Peptides with Excellent Anti-Lipase Activities. Molecules 2024; 29:765. [PMID: 38398517 PMCID: PMC10892623 DOI: 10.3390/molecules29040765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 01/22/2024] [Accepted: 01/29/2024] [Indexed: 02/25/2024] Open
Abstract
Obesity is a source of significant pathologies and deadly diseases, including heart disease, diabetes, and cancer. One of the most intriguing strategies in the hunt for new anti-obesity medications is the inhibition of pancreatic lipase (PL). This study presents a novel application of short α and β-mixed peptides as pancreatic lipase inhibitors. These peptides were synthesized in the solution phase and characterized using FTIR and 1H-NMR. L-proline is present in a high percentage of natural anti-lipase peptides and was used as a β-amino acid in this study to enhance anti-lipase activity and proteolytic stability. Moreover, L-α-proline was converted to β-amino acid derivatives using the Arndt-Eistert method with the advantage of stereo control at the α-carbon. The synthesized peptides with anti-lipase activity are N-Boc-β-Pro-Gly-OBz (93%), N-Boc-O-Bz-Tyr-β-Pro-β-Pro-Gly-OBz (92%), N-Boc-O-Bz-Tyr-β-Pro-COOH (91%), N-Boc-Phe-β-Pro-OCH3 (90%), and N-Boc-O-Bz-Tyr-β-Pro-OCH3 (89%). These peptides may function as lead molecules for further modification to more significant molecules, which can help control obesity.
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Grants
- RSP2024R393 King Saud University
- 9ebfe58b5d63cfdf,0fc4036025155e1a,3a852f3e85a2433b,ffc04817768e29d8,1eae9545a3244bed,db5d8742b53a782c,fc9of098bf237c77,8ce5883758852285 Qaiser Mahmood
- 0bb1baa309ebdbb0,6a5aa5d7ed313e53,61843063f3444df7,58875d947b81e726,615b239e803be0b0,45e50be7ef0245f1,c5d9a4fe383b609e,0ceab0ce3ca2061e Amjad Islam
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Affiliation(s)
- Naeem Ahmed
- Department of Chemistry, School of Natural Sciences, National University of Sciences and Technology, Islamabad 44000, Pakistan;
| | - Sabahat Asif
- Department of Chemistry and Chemical Engineering, Syed Babar Ali School of Science and Engineering, Lahore University of Management Sciences (LUMS), Lahore 54792, Pakistan;
| | - Muhammad Arfan
- Department of Chemistry, School of Natural Sciences, National University of Sciences and Technology, Islamabad 44000, Pakistan;
| | - Qaiser Mahmood
- Chemistry and Chemical Engineering Guangdong Laboratory, Shantou 515031, China;
| | - Amjad Islam
- Key Laboratory for Preparation and Application of Ordered Structured Materials of Guangdong Province, College of Chemistry and Chemical Engineering, Shantou University, Shantou 515063, China;
| | - Mansour K. Gatasheh
- Department of Biochemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia;
| | - Muhammad Zia
- Department of Biotechnology, Quaid-i-Azam University, Islamabad 45320, Pakistan;
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Yousuf N, Ma Y, Mahmood Q, Zhang W, Wang Y, Saeed H, Sun WH. Enhancing isoprene polymerization with high activity and adjustable monomer enchainment using cyclooctyl-fused iminopyridine iron precatalysts. Dalton Trans 2024; 53:753-764. [PMID: 38086665 DOI: 10.1039/d3dt03674j] [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: 01/03/2024]
Abstract
In this study, a series of structurally rigid cyclooctyl-fused iminopyridine iron complexes, [L2FeCl][FeCl4] and [2L3Fe][Cl][3FeCl4], was synthesized via a one-pot method and investigated as precatalysts in conjunction with methylaluminoxane for isoprene (Ip) polymerization. Combined characterization through FTIR analysis, elemental analysis and single crystal XRD analysis fully verified the structure of these complexes. The most active iron complex, FeH, exhibited a trisligated nature, with its cation adopting an octahedral geometry around the metal center. In contrast, all the other iron complexes (Fe2Me, Fe2Et, Fe2iPr, Fe3Me, Fe2Et,Me) displayed bisligated configurations, with distorted trigonal bipyramidal geometry of cations. During isoprene polymerization, the extent of steric hindrance of the ligand framework exerted a significant impact on catalytic performance. The FeH precatalyst with less steric hindrance demonstrated excellent performance, producing high molecular weight polyisoprenes with conversions exceeding 99% for 4000 equiv. of monomer. Even at very low catalyst loadings, as low as 0.0025 mol% (Fe/Ip), the polymerization of isoprene could proceed smoothly with an exceptionally high activity of 4.0 × 106 gPI (molFe, h)-1. Moreover, this precatalyst exhibited good thermal stability, maintaining high activity levels (typically 105 gPI (molFe, h)-1) across a broad temperature range from -20 °C to 100 °C. Additionally, by adjusting steric substituents and the reaction temperature, the 1,4/3,4 regioselectivity could be modulated from 9/91 to 69/31 while maintaining a high stereoselectivity of cis-1,4 structures (cis/trans: >99/1).
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Affiliation(s)
- Nighat Yousuf
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
- Chemistry and Chemical Engineering Guangdong Laboratory, Shantou 515031, China.
- CAS Research/Education Center for Excellence in Molecular Sciences and International School, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yanping Ma
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
| | - Qaiser Mahmood
- Chemistry and Chemical Engineering Guangdong Laboratory, Shantou 515031, China.
| | - Wenjuan Zhang
- Beijing Key Laboratory of Clothing Materials R&D and Assessment, School of Materials Science and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China.
| | - Yizhou Wang
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
- CAS Research/Education Center for Excellence in Molecular Sciences and International School, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hassan Saeed
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
- Chemistry and Chemical Engineering Guangdong Laboratory, Shantou 515031, China.
- CAS Research/Education Center for Excellence in Molecular Sciences and International School, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
- Chemistry and Chemical Engineering Guangdong Laboratory, Shantou 515031, China.
- CAS Research/Education Center for Excellence in Molecular Sciences and International School, University of Chinese Academy of Sciences, Beijing 100049, China
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Al-Daraghmeh TM, Zayed O, Zelai T, Saba S, Mustafa GM, Hakami O, Albalawi H, Bouzgarrou S, Mahmoud Z, Mahmood Q. Study of mechanical, optical and transport aspirants of double perovskites Cs2XInI6 (X = Li, Na) for solar cells and clean energy applications. J SOLID STATE CHEM 2023. [DOI: 10.1016/j.jssc.2023.124003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
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Ramzan M, Javed M, Iqbal S, Alhujaily A, Mahmood Q, Aroosh K, Bahadur A, Qayyum MA, Awwad NS, Ibrahium HA, Al-Anazy MM, Elkaeed EB. Designing Highly Active S-g-C3N4/Te@NiS Ternary Nanocomposites for Antimicrobial Performance, Degradation of Organic Pollutants, and Their Kinetic Study. Inorganics 2023. [DOI: 10.3390/inorganics11040156] [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: 04/07/2023] Open
Abstract
The current research is about the synthesis of pure nickel sulfide, a series of Te (0, 0.5, 1, 1.5, 2, and 3 wt.%)-doped NiS (Te@NiS) nanoparticles (NPs), and a series of S-g-C3N4 (10, 30, 50, 70, and 80 wt.%)/Te@NiS nanocomposites (NCs), fabricated through a hydrothermal route. XRD and FTIR spectroscopic techniques demonstrated the successful synthesis of NPs and NCs. SEM-EDX images confirmed the flakelike structure and elemental constituents of the fabricated materials. Tauc plots were drawn, to calculate the band gaps of the synthesized samples. Te doping resulted in a significant reduction in the band gap of the NiS NPs. The photocatalytic efficiency of the NPs and NCs was investigated against MB, under sunlight. The results obtained for the photocatalytic activity, showed that 1%Te@NiS nanoparticles have an excellent dye degradation capacity in sunlight. This was made even better by making a series of SGCN/1% Te@NiS nanocomposites with different amounts of S-g-C3N4. When compared to NiS, Te@NiS, SGCN, and 70%SGCN/1%Te@NiS, the 70%SGCN/1%Te@NiS NCs have excellent antifungal ability. The higher impact of SGCN/Te@NiS, may be due to its enhanced ability to disperse and interact with the membranes and intracellular proteins of fungi. The 70%SGCN/1%Te@NiS NCs showed excellent antibacterial and photocatalytic efficiency. Thus, the 70%SGCN/1%Te@NiS NCs might prove fruitful in antibacterial and photocatalytic applications.
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Affiliation(s)
- Maryam Ramzan
- Department of Chemistry, School of Science, University of Management and Technology, Lahore 54770, Pakistan
| | - Mohsin Javed
- Department of Chemistry, School of Science, University of Management and Technology, Lahore 54770, Pakistan
| | - Shahid Iqbal
- Department of Chemistry, School of Natural Sciences (SNS), National University of Science and Technology (NUST), H-12, Islamabad 46000, Pakistan
| | - Ahmad Alhujaily
- Biology Department, College of Science, Taibah University, P.O. Box 344, Al Madinah Al Munawarah 41477, Saudi Arabia
| | - Qaiser Mahmood
- Chemistry and Chemical Engineering Guangdong Laboratory, Shantou 515031, China
| | - Komal Aroosh
- Department of Chemistry, School of Science, University of Management and Technology, Lahore 54770, Pakistan
| | - Ali Bahadur
- Department of Chemistry, College of Science and Technology, Wenzhou-Kean University, Wenzhou 325060, China
| | - Muhammad Abdul Qayyum
- Department of Chemistry, Division of Science & Technology, University of Education, Lahore 54770, Pakistan
| | - Nasser S. Awwad
- Chemistry Department, Faculty of Science, King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia
| | - Hala A. Ibrahium
- Biology Department, Faculty of Science, King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia
| | - Murefah Mana Al-Anazy
- Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
| | - Eslam B. Elkaeed
- Department of Pharmaceutical Sciences, College of Pharmacy, AlMaarefa University, P.O. Box 71666, Riyadh 13713, Saudi Arabia
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Mera A, Nazir G, Mahmood Q, Kattan NA, Alshahrani T, Rehman A, Sultana H, Amin MA, Elhosiny Ali H. The bandgap engineering of double perovskites Cs2CuSbX6 (X = Cl, Br, I) for solar cell and thermoelectric applications. INORG CHEM COMMUN 2023. [DOI: 10.1016/j.inoche.2022.110303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Kattan NA, Rouf SA, Sfina N, Al-Anazy MM, Ullah H, Hakamy A, Mera A, Mahmood Q, Amin MA. Tuning of band gap by anion variation of double perovskites K2AgInX6 (X = Cl, Br) for solar cells and thermoelectric applications. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Mahmood Q, Li X, Qin L, Wang L, Sun WH. Structural evolution of iminopyridine support for nickel/palladium catalysts in ethylene (oligo)polymerization. Dalton Trans 2022; 51:14375-14407. [PMID: 36047748 DOI: 10.1039/d2dt02251f] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [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
The interest in the late transition metal catalyst based design of new architectures of polyethylene (PE) has continuously been increasing over the last few years. The structure of these catalysts is predominantly important in controlling the morphological and architectural properties of the resulting polyethylene. Particularly, iminopyridine is a versatile bidentate support for Ni and Pd catalysts in ethylene (oligo)polymerization providing a wide variety of products ranging from volatile oligomers to ultra-high molecular weight polyethylene. Extensive structural modifications have been induced in the iminopyridine ligand through steric and electronic substitution, tuning the catalyst behavior in terms of activity and properties of the resulting polymer. Carbocyclic-fused iminopyridine and N-oxide iminopyridine are the new state of the art iminopyridine ligand designs. In this review, we aim to summarize all the developments in mononuclear iminopyridine-nickel and -palladium catalysts for ethylene (oligo)polymerization since the first report published in 1999 to present, focusing on the correlation among the pre-catalyst, co-catalyst type, thermal stability and polymer/oligomer structure. For comparison, the structural variations in the binuclear iminopyridine-nickel catalysts are also described. The detailed comparison of the structural variations in these catalysts with respect to their polymerization performance will give deep understanding in the development of new efficient catalyst designs.
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Affiliation(s)
- Qaiser Mahmood
- Guangdong Laboratory of Chemistry and Chemical Engineering, Shantou 515031, China.
| | - Xiaoxu Li
- Guangdong Laboratory of Chemistry and Chemical Engineering, Shantou 515031, China.
| | - Lidong Qin
- Guangdong Laboratory of Chemistry and Chemical Engineering, Shantou 515031, China.
| | - Luyao Wang
- Guangdong Laboratory of Chemistry and Chemical Engineering, Shantou 515031, China.
| | - Wen-Hua Sun
- Guangdong Laboratory of Chemistry and Chemical Engineering, Shantou 515031, China. .,Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
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Alotaibi NH, Mustafa GM, Kattan NA, Mahmood Q, Albalawi H, Morsi M, Somaily H, Hafez MA, Mahmoud HI, Amin MA. DFT study of double perovskites Cs2AgBiX6 (X = Cl, Br): An alternative of hybrid perovskites. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123353] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Aftab S, Manzoor J, Mahmood Q, Shaheen T. Precocious puberty: The clinical profile and the etiological classification of children presented at a tertiary care children's hospital. Pak J Med Sci 2022; 38:955-959. [PMID: 35634621 PMCID: PMC9121963 DOI: 10.12669/pjms.38.4.4816] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Revised: 06/28/2021] [Accepted: 12/27/2021] [Indexed: 11/15/2022] Open
Abstract
Objectives To determine the clinical spectrum and underlying etiologies of children presented with precocious puberty at The Children's Hospital &The Institute of Child health, Lahore. Methods It is a retrospective review of all the children presented with precocious puberty over one year, from January 2015 to December 2015; at the department of Paediatric Endocrinology & Diabetes, The Children's Hospital & The Institute of Child Health, Lahore. Results Total 43 cases of precocious puberty (PP), with 26 females were reported in one year. Central precocious puberty (CPP) constituted 55.8% (24/43) and was found to be more prevalent in female (22/24). In 20/24 cases (83.3%) of central precocious puberty underlying etiology was idiopathic. Peripheral precocious puberty was found in 19/43 cases (44.1%) with male predominance (15/19). Congenital adrenal hyperplasia was the most frequent (12/19) underlying cause of peripheral precocious puberty in our cohort. Conclusion Precocious puberty could be a manifestation of underlying serious medical condition. It should be thoroughly evaluated with the aim to diagnose the underlying pathology and to treat them promptly.
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Affiliation(s)
- Sommayya Aftab
- Dr. Sommayya Aftab, MBBS, FCPS (Paediatric), MRCPCH (UK). Department of Paediatric Endocrinology and Diabetes, The Children’s Hospital & The Institute of Child Health, Lahore, Pakistan
| | - Jaida Manzoor
- Dr. Jaida Manzoor, MBBS, FCPS (Paediatric). Department of Paediatric Endocrinology and Diabetes, The Children’s Hospital & The Institute of Child Health, Lahore, Pakistan
| | - Qaiser Mahmood
- Dr. Qaiser Mahmood, MBBS. Department of Radiology, The Children’s Hospital & ICH Lahore, Pakistan
| | - Tahir Shaheen
- Dr. Tahir Shaheen, MBBS, FCPS (Paediatric). Department of Paediatric Endocrinology and Diabetes, The Children’s Hospital & The Institute of Child Health, Lahore, Pakistan
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Al-Muhimeed TI, Aljameel AI, Mera A, Saad S, Nazir G, Albalawi H, Bouzgarrou S, Hegazy HH, Mahmood Q. First principle study of optoelectronic and mechanical properties of lead-free double perovskites Cs2SeX6 (X = Cl, Br, I). Journal of Taibah University for Science 2022. [DOI: 10.1080/16583655.2022.2035927] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Tahani I. Al-Muhimeed
- Department of Chemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - A. I. Aljameel
- Department of Physics, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, Saudi Arabia
| | - Abeer Mera
- Department of Physics, College of Arts and Science, Prince Sattam Bin Abdulaziz University, Wadi ad-Dawasir, Saudi Arabia
- Department of Physics, Faculty of Science, Kafrelsheikh University, Kafrelsheikh, Egypt
| | - Saher Saad
- Department of Physics, University of Central Punjab, Lahore Campus, Lahore, Pakistan
| | - Ghazanfar Nazir
- Department of Chemistry, Inha University, Incheon, South Korea
| | - Hind Albalawi
- Department of Physics, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
| | - S. Bouzgarrou
- Laboratoire de Microélectronique et Instrumentation (UR 03/13-04), Faculté des Sciences de Monastir, Monastir, Tunisia
- Department of Physics, College of Science, Qassim University, Buraidah, Saudi Arabia
| | - H. H. Hegazy
- Department of Physics, Faculty of Science, King Khalid University, Abha, Saudi Arabia
- Department of Physics, Faculty of Science, Al-Azhar University, Assiut, Egypt
| | - Q. Mahmood
- Basic & Applied Scientific Research Center, Department of Physics, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
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Anbarasan R, Srinivasan M, Suriakarthick R, Albalawi H, Sundar JK, Ramasamy P, Mahmood Q. Exploring the structural, mechanical, electronic, and optical properties of double perovskites of Cs2AgInX6 (X = Cl, Br, I) by first-principles calculations. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Rashid M, Aziz F, Mahmood Q, Kattan NA, Laref A. Pressure-Induced Modifications in the Optoelectronic and Thermoelectric Properties of MgHfO3 for Renewable Energy Applications. Arab J Sci Eng 2022. [DOI: 10.1007/s13369-021-05378-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Murtaza G, Alshahrani T, Khalil RA, Mahmood Q, Flemban TH, Althib H, Laref A. Lead Free Double Perovsites Halides X2AgTlCl6 (X = Rb, Cs) for solar cells and renewable energy applications. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2021.121988] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Bahadur A, Iqbal S, Ujan R, Channar PA, Al-Anazy MM, Saeed A, Mahmood Q, Shoaib M, Shah M, Arshad I, Shabir G, Saifullah M, Liu G, Qayyum MA. Effect of organic solvents on solvatochromic, fluorescence, and electrochemical properties of synthesized thiazolylcoumarin derivatives. LUMINESCENCE 2021; 36:1189-1197. [PMID: 33759314 DOI: 10.1002/bio.4044] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 06/05/2020] [Revised: 02/05/2021] [Accepted: 03/16/2021] [Indexed: 02/06/2023]
Abstract
In this present investigation, thiazolylcoumarin derivatives (5a-5k) were synthesized from thiosemicarbazide, ethyl acetoacetate, and naphthaldehyde through a multistep route. The formation of thiazolylcoumarin derivatives with bioactive scaffolds was confirmed through nuclear magnetic resonance spectroscopy. A solvatochromic study of synthesized thiazolylcoumarin derivatives was carried out using ultraviolet-visible methods for dimethylformamide (DMF), ethyl acetate, and ethanol solvents. The redox behaviour of as-synthesized thiazolylcoumarin derivatives (5a-5k) was examined in dimethyl sulphoxide by conducting an electrochemical study. Fluorescence properties of thiazolylcoumarin derivatives were studied in DMF, ethanol, and ethyl acetate to visualize the solvent effect on the emitting ability of thiazolylcoumarin derivatives.
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Affiliation(s)
- Ali Bahadur
- Department of Transdisciplinary Studies, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, South Korea
| | - Shahid Iqbal
- School of Chemistry and Materials Engineering, Huizhou University, Huizhou, Guangdong, China
| | - Rabail Ujan
- Dr. M. A. Kazi Institute of Chemistry, University of Sindh, Jamshoro, Pakistan
| | | | - Murefah Mana Al-Anazy
- Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
| | - Aamer Saeed
- Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
| | - Qaiser Mahmood
- Institute of Chemistry, Chinese Academy of Sciences, Beijing, China
| | - Muhammad Shoaib
- Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
| | - Mazloom Shah
- Department of chemistry, Abbottabad University of Science and Technology, Abbottabad, Pakistan
| | - Ifzan Arshad
- Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
| | - Ghulam Shabir
- Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
| | | | - Guocong Liu
- School of Chemistry and Materials Engineering, Huizhou University, Huizhou, Guangdong, China
| | - Muhammad Abdul Qayyum
- Department of Chemistry Division of Science and Technology University of Education Lahore, Pakistan
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Ujan R, Bahadur A, Shabir G, Iqbal S, Saeed A, Channar PA, Mahmood Q, Shoaib M, Arshad I, Saifullah M, Liu G, Irfan RM, Ahmad Z, Javed M, Raheel M, Qayyum MA, Khalid B, Rizwan K. Facile synthesis of novel fluorescent thiazole coumarinyl compounds: Electrochemical, time resolve fluorescence, and solvatochromic study. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129422] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Mahmood Q, Xu G, Zhou L, Guo X, Wang Q. Chiral 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD)-Catalyzed Stereoselective Ring-Opening Polymerization of rac-Lactide: High Reactivity for Isotactic Enriched Polylactides (PLAs). Polymers (Basel) 2020; 12:E2365. [PMID: 33076378 PMCID: PMC7602607 DOI: 10.3390/polym12102365] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 09/21/2020] [Accepted: 09/30/2020] [Indexed: 11/16/2022] Open
Abstract
Chiral 4,8-diphenyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene (DiPh-TBD) was synthesized and applied to a ring-opening polymerization of rac-lactide (rac-LA). The chiral DiPh-TBD promoted the synthesis of isotactic enriched polylactides (PLAs) with controlled molecular weight and narrow molecular weight distributions under mild, metal-free conditions. When the [rac-LA]/[Cat.] ratio was 100/1, full monomer conversion was achieved within only 1 min and a moderate probability of 0.67 meso dyads (Pm) was obtained at room temperature. A chain-end control mechanism (CEC) was found to be responsible for the isoselectivity based on the homodecoupled 1H NMR spectrum, the chiral HPLC measurement, and kinetic studies.
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Affiliation(s)
- Qaiser Mahmood
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China; (Q.M.); (L.Z.); (X.G.)
| | - Guangqiang Xu
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China; (Q.M.); (L.Z.); (X.G.)
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Li Zhou
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China; (Q.M.); (L.Z.); (X.G.)
| | - Xuanhua Guo
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China; (Q.M.); (L.Z.); (X.G.)
| | - Qinggang Wang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China; (Q.M.); (L.Z.); (X.G.)
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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17
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Abbas SA, Mahmood I, Sajjad M, Noor N, Mahmood Q, Naeem M, Mahmood A, Ramay SM. Spinel-type Na2MoO4 and Na2WO4 as promising optoelectronic materials: First-principle DFT calculations. Chem Phys 2020. [DOI: 10.1016/j.chemphys.2020.110902] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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18
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Zhao M, Wang L, Mahmood Q, Jing C, Zhu G, Zhang X, Chen X, Wang Q. Highly active and thermo‐stable iminopyridyl vanadium oxychloride catalyzed isoprene polymerization. Journal of Polymer Science 2020. [DOI: 10.1002/pol.20200291] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Mengmeng Zhao
- Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences Qingdao China
| | - Liang Wang
- Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences Qingdao China
| | - Qaiser Mahmood
- Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences Qingdao China
| | - Chuyang Jing
- Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences Qingdao China
| | - Guangqian Zhu
- Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences Qingdao China
- Center of Materials Science and Optoelectronics Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, University of Chinese Academy of Sciences Beijing China
| | - Xianhui Zhang
- Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences Qingdao China
- Center of Materials Science and Optoelectronics Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, University of Chinese Academy of Sciences Beijing China
| | - Xiao Chen
- Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences Qingdao China
| | - Qinggang Wang
- Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences Qingdao China
- Center of Materials Science and Optoelectronics Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, University of Chinese Academy of Sciences Beijing China
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19
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20
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Mahmood Q, Ul Haq B, Rashid M, Noor N, AlFaify S, Laref A. First-principles study of magnetic and thermoelectric properties of SnFe2O4 and SnCo2O4 spinels. J SOLID STATE CHEM 2020. [DOI: 10.1016/j.jssc.2020.121279] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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Mahmood Q, Noor N, Jadan M, Addasi JS, Mahmood A, Ramay SM. First-principle investigation of ferromagnetism and thermoelectric characteristics of MgCr2X4 (X = S, Se) spinels. J SOLID STATE CHEM 2020. [DOI: 10.1016/j.jssc.2020.121261] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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22
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Tanveer W, Mahmood Q, Mahmood I, Ashiq M, Ramay SM, Mahmood A. First-principles calculation to investigate half metallic ferromagnetism and thermoelectric properties of Ca0.75Ti0.25X (X = S, Se) alloys. Chem Phys 2020. [DOI: 10.1016/j.chemphys.2020.110690] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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23
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Lv C, Zhou L, Yuan R, Mahmood Q, Xu G, Wang Q. Isoselective ring-opening polymerization and asymmetric kinetic resolution polymerization of rac-lactide catalyzed by bifunctional iminophosphorane–thiourea/urea catalysts. NEW J CHEM 2020. [DOI: 10.1039/c9nj05074d] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The isoselective mechanism (CEC or ESC) for ring-opening polymerization of rac-LA was demonstrated using chiral and achiral IPTU/IPU organocatalysts.
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Affiliation(s)
- Chengdong Lv
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Li Zhou
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Ruiting Yuan
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Qaiser Mahmood
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Guangqiang Xu
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Qinggang Wang
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
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24
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Kuijf HJ, Biesbroek JM, De Bresser J, Heinen R, Andermatt S, Bento M, Berseth M, Belyaev M, Cardoso MJ, Casamitjana A, Collins DL, Dadar M, Georgiou A, Ghafoorian M, Jin D, Khademi A, Knight J, Li H, Llado X, Luna M, Mahmood Q, McKinley R, Mehrtash A, Ourselin S, Park BY, Park H, Park SH, Pezold S, Puybareau E, Rittner L, Sudre CH, Valverde S, Vilaplana V, Wiest R, Xu Y, Xu Z, Zeng G, Zhang J, Zheng G, Chen C, van der Flier W, Barkhof F, Viergever MA, Biessels GJ. Standardized Assessment of Automatic Segmentation of White Matter Hyperintensities and Results of the WMH Segmentation Challenge. IEEE Trans Med Imaging 2019; 38:2556-2568. [PMID: 30908194 PMCID: PMC7590957 DOI: 10.1109/tmi.2019.2905770] [Citation(s) in RCA: 103] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Quantification of cerebral white matter hyperintensities (WMH) of presumed vascular origin is of key importance in many neurological research studies. Currently, measurements are often still obtained from manual segmentations on brain MR images, which is a laborious procedure. The automatic WMH segmentation methods exist, but a standardized comparison of the performance of such methods is lacking. We organized a scientific challenge, in which developers could evaluate their methods on a standardized multi-center/-scanner image dataset, giving an objective comparison: the WMH Segmentation Challenge. Sixty T1 + FLAIR images from three MR scanners were released with the manual WMH segmentations for training. A test set of 110 images from five MR scanners was used for evaluation. The segmentation methods had to be containerized and submitted to the challenge organizers. Five evaluation metrics were used to rank the methods: 1) Dice similarity coefficient; 2) modified Hausdorff distance (95th percentile); 3) absolute log-transformed volume difference; 4) sensitivity for detecting individual lesions; and 5) F1-score for individual lesions. In addition, the methods were ranked on their inter-scanner robustness; 20 participants submitted their methods for evaluation. This paper provides a detailed analysis of the results. In brief, there is a cluster of four methods that rank significantly better than the other methods, with one clear winner. The inter-scanner robustness ranking shows that not all the methods generalize to unseen scanners. The challenge remains open for future submissions and provides a public platform for method evaluation.
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25
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Mahmood Q, Hassan M, Yaseen M, Laref A. Half-metallic ferromagnetism and optical behavior in alkaline-earth metals based Beryllium perovskites: DFT calculations. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.05.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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26
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Mahmood Q, Rashid M, Amin B, Noor N, Laref A. Theoretical prediction of optoelectronic and thermoelectric properties of RbXO2 (X = Al, Ga, In) for renewable energy applications. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.04.084] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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27
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Zhao M, Mahmood Q, Jing C, Wang L, Zhu G, Zhang X, Wang Q. Isoprene Polymerization: Catalytic Performance of Iminopyridine Vanadium(III) Chloride versus Vanadium(III) Chloride. Polymers (Basel) 2019; 11:polym11071122. [PMID: 31269642 PMCID: PMC6681085 DOI: 10.3390/polym11071122] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Revised: 06/07/2019] [Accepted: 06/18/2019] [Indexed: 01/23/2023] Open
Abstract
A series of vanadium complexes bearing iminopyridine bidentate ligands with various electronic and steric properties: V1 [CH2Ph], V2 [CMe2CH2CMe3], V3 [Ph] and V4 [2,6-iPr2Ph] were prepared and characterized by IR spectroscopy and microanalytical analysis. The catalytic capacity of all the complexes has been investigated for isoprene polymerization and was controlled by tuning the ligand structure with different N-alkyl and N-aryl groups. Activated by methylaluminoxane (MAO), the aryl-substituted complex V3 [Ph] exhibited high cis-1,4 selectivity (75%), and the resultant polymers had high molecular weights (Mn = 6.6 × 104) and narrow molecular weight distributions (PDI = 2.3). This catalyst showed high activity up to 734.4 kg polymer (mol V)−1 h−1 with excellent thermostability even stable at 70 °C. Compared to the traditional VCl3/MAO catalytic system, iminopyridine-supported V(III) catalysts displayed higher catalytic activities and changed the selectivity of monomer enchainment from trans-1,4 to cis-1,4.
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Affiliation(s)
- Mengmeng Zhao
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266000, China
| | - Qaiser Mahmood
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266000, China
| | - Chuyang Jing
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266000, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Liang Wang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266000, China
| | - Guangqian Zhu
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266000, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xianhui Zhang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266000, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qinggang Wang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266000, China.
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
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28
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Mahmood Q, Ma Y, Hao X, Sun W. Substantially enhancing the catalytic performance of
bis
(imino)pyridylcobaltous chloride pre‐catalysts adorned with benzhydryl and nitro groups for ethylene polymerization. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.4857] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Qaiser Mahmood
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular ScienceInstitute of Chemistry, Chinese Academy of Sciences Beijing 100190 China
- CAS Research/Education Center for Excellence in Molecular SciencesUniversity of Chinese Academy of Sciences Beijing 100049 China
| | - Yanping Ma
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular ScienceInstitute of Chemistry, Chinese Academy of Sciences Beijing 100190 China
- CAS Research/Education Center for Excellence in Molecular SciencesUniversity of Chinese Academy of Sciences Beijing 100049 China
| | - Xiang Hao
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular ScienceInstitute of Chemistry, Chinese Academy of Sciences Beijing 100190 China
- CAS Research/Education Center for Excellence in Molecular SciencesUniversity of Chinese Academy of Sciences Beijing 100049 China
| | - Wen‐Hua Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular ScienceInstitute of Chemistry, Chinese Academy of Sciences Beijing 100190 China
- CAS Research/Education Center for Excellence in Molecular SciencesUniversity of Chinese Academy of Sciences Beijing 100049 China
- State Key Laboratory for Oxo Synthesis and Selective OxidationLanzhou Institute of Chemical Physics, Chinese Academy of Sciences Lanzhou 730000 China
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29
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Yuan R, Shou Q, Mahmood Q, Xu G, Sun X, Wan J, Wang Q. Kinetic Studies on Guanidine-Superbase-Promoted Ring-Opening Polymerization of ε-Caprolactone. Synlett 2019. [DOI: 10.1055/s-0037-1611766] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The kinetics of the ring-opening polymerization of ε-caprolactone with butane-1,4-diol as the initiator and 1,5,7-triazabicyclo[4.4.0]dec-5-ene as catalyst were examined. A highly efficient and controllable polymerization of ε-caprolactone occurred with an activation energy of 22.5 kJ·mol–1, which is much lower than that observed with butan-1-ol as the initiator (39.5 kJ·mol–1). An intramolecular hydrogen-bonding-assisted mechanism is proposed to explain this lowering of the activation energy.
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Affiliation(s)
- Ruiting Yuan
- School of Materials Science and Engineering, Qingdao University of Science and Technology
| | - Qinghui Shou
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
| | - Qaiser Mahmood
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
| | - Guangqiang Xu
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
| | - Xitong Sun
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
| | - Jiaqi Wan
- School of Materials Science and Engineering, Qingdao University of Science and Technology
| | - Qinggang Wang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
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30
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Huang C, Zakharov VA, Semikolenova NV, Matsko MA, Mahmood Q, Talsi EP, Sun WH. Comparisons between homogeneous and immobilized 1-(2,6-dibenzhydryl-4-nitrophenylimino)-2-mesityliminoacenaphthylnickel bromide as a precatalyst in ethylene polymerization. J Catal 2019. [DOI: 10.1016/j.jcat.2019.02.027] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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31
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Wang Q, Zhang X, Zhou L, Mahmood Q, Zhao M, Wang X. 1,5,7-Triazabicylodec-5-ene-Promoted Direct Vinylogous Aldol Reaction for the Synthesis of 3-Hydroxy-2-oxoindole Derivatives. Synlett 2019. [DOI: 10.1055/s-0037-1612107] [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: 10/27/2022]
Abstract
A simple and efficient method has been developed for the synthesis of 3-hydroxy-2-oxoindole derivatives through a direct vinylogous aldol reaction of allylic esters with isatins, catalyzed by 1,5,7-triazabicyclodec-5-ene. This method affords a variety of 3-hydroxy-2-oxoindole derivatives in moderate to excellent yields with high regioselectivities. An asymmetric version of this reaction catalyzed by Corey’s chiral guanidine proceeded with moderate enantioselectivity. The protocol can also be used to synthesize isatin spiro ethers.
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Affiliation(s)
- Qinggang Wang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
| | - Xianhui Zhang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences
| | - Li Zhou
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences
| | - Qaiser Mahmood
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
| | - Mengmeng Zhao
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
| | - Xiaowu Wang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
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32
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Zhao M, Wang L, Mahmood Q, Jing C, Zhu G, Zhang X, Wang X, Wang Q. Controlled isoprene polymerization mediated by iminopyridine-iron (II) acetylacetonate pre-catalysts. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.4836] [Citation(s) in RCA: 13] [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: 12/15/2022]
Affiliation(s)
- Mengmeng Zhao
- Key Laboratory of Biobased Materials; Qingdao Institute of Biomass Energy and Bioprocess Technology, Chinese Academy of Sciences; Qingdao 266000 China
| | - Liang Wang
- Key Laboratory of Biobased Materials; Qingdao Institute of Biomass Energy and Bioprocess Technology, Chinese Academy of Sciences; Qingdao 266000 China
| | - Qaiser Mahmood
- Key Laboratory of Biobased Materials; Qingdao Institute of Biomass Energy and Bioprocess Technology, Chinese Academy of Sciences; Qingdao 266000 China
| | - Chuyang Jing
- Key Laboratory of Biobased Materials; Qingdao Institute of Biomass Energy and Bioprocess Technology, Chinese Academy of Sciences; Qingdao 266000 China
- Center of Materials Science and Optoelectronics Engineering; University of Chinese Academy of Sciences; Beijing 100049 China
| | - Guangqian Zhu
- Key Laboratory of Biobased Materials; Qingdao Institute of Biomass Energy and Bioprocess Technology, Chinese Academy of Sciences; Qingdao 266000 China
- Center of Materials Science and Optoelectronics Engineering; University of Chinese Academy of Sciences; Beijing 100049 China
| | - Xianhui Zhang
- Key Laboratory of Biobased Materials; Qingdao Institute of Biomass Energy and Bioprocess Technology, Chinese Academy of Sciences; Qingdao 266000 China
- Center of Materials Science and Optoelectronics Engineering; University of Chinese Academy of Sciences; Beijing 100049 China
| | - Xiaowu Wang
- Key Laboratory of Biobased Materials; Qingdao Institute of Biomass Energy and Bioprocess Technology, Chinese Academy of Sciences; Qingdao 266000 China
| | - Qinggang Wang
- Key Laboratory of Biobased Materials; Qingdao Institute of Biomass Energy and Bioprocess Technology, Chinese Academy of Sciences; Qingdao 266000 China
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33
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Zhang X, Zhu G, Mahmood Q, Zhao M, Wang L, Jing C, Wang X, Wang Q. Iminoimidazole-based Co(II) and Fe(II) complexes: Syntheses, characterization, and catalytic behaviors for isoprene polymerization. ACTA ACUST UNITED AC 2019. [DOI: 10.1002/pola.29323] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xianhui Zhang
- Key Laboratory of Biobased Materials; Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences; Qingdao 266101 China
- Center of Materials Science and Optoelectronics Engineering; University of Chinese Academy of Sciences; Beijing 100049 China
| | - Guangqian Zhu
- Key Laboratory of Biobased Materials; Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences; Qingdao 266101 China
- Center of Materials Science and Optoelectronics Engineering; University of Chinese Academy of Sciences; Beijing 100049 China
| | - Qaiser Mahmood
- Key Laboratory of Biobased Materials; Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences; Qingdao 266101 China
| | - Mengmeng Zhao
- Key Laboratory of Biobased Materials; Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences; Qingdao 266101 China
| | - Liang Wang
- Key Laboratory of Biobased Materials; Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences; Qingdao 266101 China
| | - Chuyang Jing
- Key Laboratory of Biobased Materials; Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences; Qingdao 266101 China
- Center of Materials Science and Optoelectronics Engineering; University of Chinese Academy of Sciences; Beijing 100049 China
| | - Xiaowu Wang
- Key Laboratory of Biobased Materials; Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences; Qingdao 266101 China
| | - Qinggang Wang
- Key Laboratory of Biobased Materials; Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences; Qingdao 266101 China
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34
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Zhou L, Xu G, Mahmood Q, Lv C, Wang X, Sun X, Guo K, Wang Q. N-Heterocyclic olefins and thioureas as an efficient cooperative catalyst system for ring-opening polymerization of δ-valerolactone. Polym Chem 2019. [DOI: 10.1039/c9py00018f] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
An organocatalytic ring-opening polymerization of δ-valerolactone has been developed.
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Affiliation(s)
- Li Zhou
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Guangqiang Xu
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Qaiser Mahmood
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Chengdong Lv
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Xiaowu Wang
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Xitong Sun
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Kai Guo
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Biotechnology and Pharmaceutical Engineering
- Nanjing Tech University
- Nanjing
- China
| | - Qinggang Wang
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
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35
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Jing C, Wang L, Mahmood Q, Zhao M, Zhu G, Zhang X, Wang X, Wang Q. Synthesis and characterization of aminopyridine iron(ii) chloride catalysts for isoprene polymerization: sterically controlled monomer enchainment. Dalton Trans 2019; 48:7862-7874. [DOI: 10.1039/c9dt00452a] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Aminopyridine iron(ii) chloride complexes coordinating a type of flexible ligand are reported as precursors for controlled polymerization of isoprenes.
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Affiliation(s)
- Chuyang Jing
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Liang Wang
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Qaiser Mahmood
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Mengmeng Zhao
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Guangqian Zhu
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Xianhui Zhang
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Xiaowu Wang
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Qinggang Wang
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
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36
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Guo X, Lv C, Mahmood Q, Zhou L, Xu G, Wang Q. Solvent-controlled chemoselective N-dealkylation-N-nitrosation or C-nitration of N-alkyl anilines with tert-butyl nitrite. Org Chem Front 2019. [DOI: 10.1039/c9qo00965e] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A metal-free, acid-free and chemoselective N-dealkylation-N-nitrosation or C-nitration of N-alkyl anilines has been developed.
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Affiliation(s)
- Xuanhua Guo
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Chengdong Lv
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Qaiser Mahmood
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Li Zhou
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Guangqiang Xu
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Qinggang Wang
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
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37
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Mahmood Q, Yue E, Guo J, Zhang W, Ma Y, Hao X, Sun WH. Nitro-functionalized bis(imino)pyridylferrous chlorides as thermo-stable precatalysts for linear polyethylenes with high molecular weights. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.11.016] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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38
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Mahmood Q, Sun WH. N, N-chelated nickel catalysts for highly branched polyolefin elastomers: a survey. R Soc Open Sci 2018; 5:180367. [PMID: 30109091 PMCID: PMC6083730 DOI: 10.1098/rsos.180367] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Accepted: 06/27/2018] [Indexed: 06/08/2023]
Abstract
The physical properties and end applications of polyolefin materials are defined by their chain architectures and topologies. These properties can, in part, be controlled by a judicious choice of the steric and electronic properties of the catalyst and, in particular, the ligand framework. One major achievement in this field is the discovery of thermoplastic polyolefin elastomers that combine the processing and recyclable characteristics of thermoplastics with the flexibility and ductility of elastomers. These polymers are highly sought after as alternative materials to thermoset elastomers. In this perspective, works in the literature related to the development of nickel catalysts as well as their implementations for the synthesis of polyolefin elastomers are summarized in detail. Throughout the perspective, attention has been focused on developing the relationship between catalyst structure and performance, on strategies for the synthesis of polyolefin elastomer using nickel catalysts, on properties of the resultant polyolefin, such as degree of branching and crystallinity, as well as on their effects on mechanical properties. The future perspective regarding the most recent developments in single-step production of polyethylene elastomers will also be presented.
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Affiliation(s)
- Qaiser Mahmood
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- CAS Research/Education Center for Excellence in Molecular Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- CAS Research/Education Center for Excellence in Molecular Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
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39
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Zeng Y, Mahmood Q, Zhang Q, Liang T, Sun WH. Highly thermo-stable and electronically controlled palladium precatalysts for vinyl homo/co-polymerization of norbornene-ethylene. Eur Polym J 2018. [DOI: 10.1016/j.eurpolymj.2018.04.028] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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40
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Mahmood Q, Guo J, Zhang W, Ma Y, Liang T, Sun WH. Concurrently Improving the Thermal Stability and Activity of Ferrous Precatalysts for the Production of Saturated/Unsaturated Polyethylene. Organometallics 2018. [DOI: 10.1021/acs.organomet.7b00909] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Qaiser Mahmood
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
- CAS Research/Education Center for Excellence in Molecular Sciences and International School, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Jingjing Guo
- Beijing Key Laboratory of Clothing Materials R&D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, School of Materials Science and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, People’s Republic of China
| | - Wenjuan Zhang
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
- Beijing Key Laboratory of Clothing Materials R&D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, School of Materials Science and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, People’s Republic of China
| | - Yanping Ma
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
| | - Tongling Liang
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
| | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
- CAS Research/Education Center for Excellence in Molecular Sciences and International School, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
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41
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Mahmood Q, Zeng Y, Wang X, Sun Y, Sun WH. Advancing polyethylene properties by incorporating NO 2 moiety in 1,2-bis(arylimino)acenaphthylnickel precatalysts: synthesis, characterization and ethylene polymerization. Dalton Trans 2018; 46:6934-6947. [PMID: 28504797 DOI: 10.1039/c7dt01295k] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A new family of nickel halides (bromides Ni1-Ni5 and chlorides Ni6-Ni10) ligated by 1-(2,6-dibenzhydryl-4-nitrophenylimino)-2-(arylimino)acenaphthylene (Aryl = 2,6-Me2C6H3L1, 2,6-Et2C6H3L2, 2,6-iPr2C6H3L3, 2,4,6-Me3C6H2L4, and 2,6-Et2-4-MeC6H2L5) have been prepared and well characterized, and the scope of their catalytic properties toward the polymerization of ethylene has been investigated. Upon activation with either Et2AlCl or EASC, the nickel bromide complexes displayed better activities than their nickel chloride counterparts and produced higher-molecular-weight polyethylene in the range of 106 g mol-1 with a very narrow range of molecular weight distributions. In comparison with reference precatalysts with non-nitro substituents (CH3, F or Cl), the title complexes experienced a modest negative effect on catalytic activity upon replacement with a NO2 moiety (activity up to 4.61 × 106 g PE (mol Ni)-1 h-1 at 20 °C). Conversely, the NO2 moiety exerted a positive effect to increase the molecular weight of the resulting polyethylene, and Ni4/Et2AlCl gave polyethylene with a maximum molecular weight of as high as 32.8 × 105 g mol-1, which is not only the highest among the title complexes but also higher than any literature values reported with 1,2-diiminoacenaphthylnickel halides.
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Affiliation(s)
- Qaiser Mahmood
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
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42
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Zeng Y, Mahmood Q, Zhang Q, Liang T, Sun WH. Vinyl homo/copolymerization of norbornene and ethylene using sterically enhanced 1,2-bis(arylimino)acenaphthene-palladium precatalysts. ACTA ACUST UNITED AC 2018. [DOI: 10.1002/pola.28970] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yanning Zeng
- College of Materials Science and Engineering; Guilin University of Technology; Guilin 541004 China
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences; Institute of Chemistry, Chinese Academy of Sciences; Beijing 100190 China
| | - Qaiser Mahmood
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences; Institute of Chemistry, Chinese Academy of Sciences; Beijing 100190 China
- CAS Research/Education Center for Excellence in Molecular Sciences; University of Chinese Academy of Sciences; Beijing 100049 China
| | - Qiuyue Zhang
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences; Institute of Chemistry, Chinese Academy of Sciences; Beijing 100190 China
- CAS Research/Education Center for Excellence in Molecular Sciences; University of Chinese Academy of Sciences; Beijing 100049 China
| | - Tongling Liang
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences; Institute of Chemistry, Chinese Academy of Sciences; Beijing 100190 China
| | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences; Institute of Chemistry, Chinese Academy of Sciences; Beijing 100190 China
- CAS Research/Education Center for Excellence in Molecular Sciences; University of Chinese Academy of Sciences; Beijing 100049 China
- State Key Laboratory for Oxo Synthesis and Selective Oxidation; Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences; Lanzhou 730000 China
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43
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Wang Z, Solan GA, Mahmood Q, Liu Q, Ma Y, Hao X, Sun WH. Bis(imino)pyridines Incorporating Doubly Fused Eight-Membered Rings as Conformationally Flexible Supports for Cobalt Ethylene Polymerization Catalysts. Organometallics 2018. [DOI: 10.1021/acs.organomet.7b00809] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Zheng Wang
- Key
Laboratory of Engineering Plastics and Beijing National Laboratory
for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- CAS
Research/Education Center for Excellence in Molecular Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Gregory A. Solan
- Key
Laboratory of Engineering Plastics and Beijing National Laboratory
for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Department
of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom
| | - Qaiser Mahmood
- Key
Laboratory of Engineering Plastics and Beijing National Laboratory
for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- CAS
Research/Education Center for Excellence in Molecular Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qingbin Liu
- College
of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, China
| | - Yanping Ma
- Key
Laboratory of Engineering Plastics and Beijing National Laboratory
for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Xiang Hao
- Key
Laboratory of Engineering Plastics and Beijing National Laboratory
for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Wen-Hua Sun
- Key
Laboratory of Engineering Plastics and Beijing National Laboratory
for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- CAS
Research/Education Center for Excellence in Molecular Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
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44
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Zeng Y, Mahmood Q, Hao X, Sun WH. Synthesis and ethylene polymerization of 8-(fluorenylarylimino)-5,6,7-trihydroquinolylnickel chlorides: Tailoring polyethylenes by adjusting fluorenyl position and adduct Et2
Zn. ACTA ACUST UNITED AC 2017. [DOI: 10.1002/pola.28563] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yanning Zeng
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences; Institute of Chemistry, Chinese Academy of Sciences; Beijing 100190 China
| | - Qaiser Mahmood
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences; Institute of Chemistry, Chinese Academy of Sciences; Beijing 100190 China
- International School; University of Chinese Academy of Sciences; Beijing 100049 China
| | - Xiang Hao
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences; Institute of Chemistry, Chinese Academy of Sciences; Beijing 100190 China
| | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences; Institute of Chemistry, Chinese Academy of Sciences; Beijing 100190 China
- International School; University of Chinese Academy of Sciences; Beijing 100049 China
- State Key Laboratory for Oxo Synthesis and Selective Oxidation; Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences; Lanzhou 730000 China
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45
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Mahmood Q, Zeng Y, Yue E, Solan GA, Liang T, Sun WH. Ultra-high molecular weight elastomeric polyethylene using an electronically and sterically enhanced nickel catalyst. Polym Chem 2017. [DOI: 10.1039/c7py01606a] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [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
Highly active para-t-Bu-containing 1,2-bis(imino)acenaphthene-Ni(ii) catalysts are disclosed which afford hyper-branched PEs with Mw's up to 3.1 × 106 g mol−1; high tensile strength, excellent shape fixity as well as high elongation at break are a feature.
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Affiliation(s)
- Qaiser Mahmood
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Yanning Zeng
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Erlin Yue
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Gregory A. Solan
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Tongling Liang
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
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46
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Zeng Y, Mahmood Q, Liang T, Sun WH. (Co-)polymerization of methylacrylate with NBE/1-hexene by (8-arylimino-5,6,7-trihydroquinolyl)(methyl)palladium chlorides: an approaching mechanism and the polymeric microstructures. NEW J CHEM 2017. [DOI: 10.1039/c6nj04019e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The title complexes exhibited a good polymerization performance for MA monomer homopolymerization and copolymerization with either norbornene or 1-hexene as a non-polar monomer affording good co-monomer insertion.
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Affiliation(s)
- Yanning Zeng
- Key Laboratory of Engineering Plastics
- Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Qaiser Mahmood
- Key Laboratory of Engineering Plastics
- Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Tongling Liang
- Key Laboratory of Engineering Plastics
- Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics
- Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
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47
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Zhang Y, Huang C, Wang X, Mahmood Q, Hao X, Hu X, Guo CY, Solan GA, Sun WH. Highly branched unsaturated polyethylenes achievable using strained imino-cyclopenta[b]pyridyl-nickel precatalysts. Polym Chem 2017. [DOI: 10.1039/c6py02089e] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Highly branched and unsaturated PEs with narrow PDIs have been obtained using nickel catalysts that display high activities, rapid regeneration of active species and high rates of chain isomerization.
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Affiliation(s)
- Youfu Zhang
- College of Chemical Engineering
- Zhejiang University of Technology
- Hangzhou 310014
- China
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science
| | - Chuanbing Huang
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Xinxin Wang
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Qaiser Mahmood
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Xiang Hao
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Xinquan Hu
- College of Chemical Engineering
- Zhejiang University of Technology
- Hangzhou 310014
- China
| | - Cun-Yue Guo
- School of Chemistry and Chemical Engineering
- University of Chinese Academy of Sciences
- Beijing 100049
- China
| | - Gregory A. Solan
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
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48
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Mahmood Q, Hassan M, Noor NA. Systematic study of room-temperature ferromagnetism and the optical response of Zn 1-x TM x S/Se (TM = Mn, Fe, Co, Ni) ferromagnets: first-principle approach. J Phys Condens Matter 2016; 28:506001. [PMID: 27758981 DOI: 10.1088/0953-8984/28/50/506001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The structural, magnetic and optical characteristics of Zn1-x TM x S/Se (TM = Mn, Fe, Co, Ni and x = 6.25%) have been investigated through the full-potential linearized augmented plane wave method within the framework of density functional theory. The optimized structures have been used to calculate the ferromagnetic and the antiferromagnetic ground-state energies. The stability of the ferromagnetic phase has been confirmed from the formation and the cohesive energies. The Heisenberg model is used to elucidate the Curie temperature (T c) of these alloys. From the band structures and density of states plots, it has been observed that TM-doped ZnS/Se alloys appear to be semiconductors and exhibit ferromagnetism. In addition, the observed ferromagnetism has also been explained in terms of direct exchange energy Δ x (d), exchange splitting energy Δ x (pd), crystal-field energy (E crys), exchange constants (N 0 α and N 0 β) and magnetic moments that shows potential spintronic applications. The optical behaviors of these alloys have been explained in terms of real and imaginary parts of the dielectric constant ε(ω), refractive index n(ω), extinction coefficient K(ω), reflectivity R(ω) and absorption coefficient σ(ω), in the energy range 0-25 eV. The calculated static limits of the band gaps and real part of the dielectric constants satisfy the Penn model. The critical limits of the imaginary part of the dielectric constants and absorption coefficients indicate that these alloys can be operated in the visible and the ultraviolet region of the electromagnetic spectrum; therefore, make them important for optoelectronic applications.
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Affiliation(s)
- Q Mahmood
- Department of Physics, University of the Punjab, Quaid-e-Azam Campus, Lahore 54590, Pakistan
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49
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Zeng Y, Mahmood Q, Liang T, Sun WH. Geometry Constrained N-(5,6,7-Trihydroquinolin-8-ylidene)arylaminopalladium Dichloride Complexes: Catalytic Behavior toward Methyl Acrylate (MA), Methyl Acrylate-co-Norbornene (MA-co-NB) Polymerization and Heck Coupling. Molecules 2016; 21:molecules21121686. [PMID: 27941630 PMCID: PMC6273177 DOI: 10.3390/molecules21121686] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 12/02/2016] [Accepted: 12/03/2016] [Indexed: 11/16/2022] Open
Abstract
A new pair of plladium complexes (Pd4 and Pd5) ligated with constrained N-(5,6,7-trihydroquinolin-8-ylidene)arylamine ligands have been prepared and well characterized by 1H-, 13C-NMR and FTIR spectroscopies as well as elemental analysis. The molecular structure of Pd4 and Pd5 in solid state have also been determined by X-ray diffraction, showing slightly distorted square planar geometry around the palladium metal center. All complexes Pd1–Pd5 are revealed highly efficient catalyst in methyl acrylate (MA) polymerization as well as methyl acrylate/norbornene (MA/NB) copolymerization. In the case of MA polymerization, as high as 98.4% conversion with high molecular weight up to 6282 kg·mol−1 was achieved. Likewise, Pd3 complex has good capability to incorporate about 18% NB content into MA polymer chains. Furthermore, low catalyst loadings (0.002 mol %) of Pd4 or Pd5 are able to efficiently mediate the coupling of haloarenes with styrene affording up to 98% conversion.
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Affiliation(s)
- Yanning Zeng
- Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
| | - Qaiser Mahmood
- Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
- International School, University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Tongling Liang
- Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
| | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
- International School, University of Chinese Academy of Sciences, Beijing 100049, China.
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50
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Maier O, Menze BH, von der Gablentz J, Ḧani L, Heinrich MP, Liebrand M, Winzeck S, Basit A, Bentley P, Chen L, Christiaens D, Dutil F, Egger K, Feng C, Glocker B, Götz M, Haeck T, Halme HL, Havaei M, Iftekharuddin KM, Jodoin PM, Kamnitsas K, Kellner E, Korvenoja A, Larochelle H, Ledig C, Lee JH, Maes F, Mahmood Q, Maier-Hein KH, McKinley R, Muschelli J, Pal C, Pei L, Rangarajan JR, Reza SMS, Robben D, Rueckert D, Salli E, Suetens P, Wang CW, Wilms M, Kirschke JS, Kr Amer UM, Münte TF, Schramm P, Wiest R, Handels H, Reyes M. ISLES 2015 - A public evaluation benchmark for ischemic stroke lesion segmentation from multispectral MRI. Med Image Anal 2016; 35:250-269. [PMID: 27475911 DOI: 10.1016/j.media.2016.07.009] [Citation(s) in RCA: 214] [Impact Index Per Article: 26.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Revised: 05/30/2016] [Accepted: 07/20/2016] [Indexed: 01/14/2023]
Abstract
Ischemic stroke is the most common cerebrovascular disease, and its diagnosis, treatment, and study relies on non-invasive imaging. Algorithms for stroke lesion segmentation from magnetic resonance imaging (MRI) volumes are intensely researched, but the reported results are largely incomparable due to different datasets and evaluation schemes. We approached this urgent problem of comparability with the Ischemic Stroke Lesion Segmentation (ISLES) challenge organized in conjunction with the MICCAI 2015 conference. In this paper we propose a common evaluation framework, describe the publicly available datasets, and present the results of the two sub-challenges: Sub-Acute Stroke Lesion Segmentation (SISS) and Stroke Perfusion Estimation (SPES). A total of 16 research groups participated with a wide range of state-of-the-art automatic segmentation algorithms. A thorough analysis of the obtained data enables a critical evaluation of the current state-of-the-art, recommendations for further developments, and the identification of remaining challenges. The segmentation of acute perfusion lesions addressed in SPES was found to be feasible. However, algorithms applied to sub-acute lesion segmentation in SISS still lack accuracy. Overall, no algorithmic characteristic of any method was found to perform superior to the others. Instead, the characteristics of stroke lesion appearances, their evolution, and the observed challenges should be studied in detail. The annotated ISLES image datasets continue to be publicly available through an online evaluation system to serve as an ongoing benchmarking resource (www.isles-challenge.org).
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Affiliation(s)
- Oskar Maier
- Institut for Medical Informatics, University of Lübeck, Lübeck, Germany
- Graduate School for Computing in Medicine and Live Science, University of Lübeck, Germany
| | - Bjoern H Menze
- Institute for Advanced Study and Department of Computer Science, Technische Universität München, Munich, Germany
| | | | - Levin Ḧani
- Institute for Surgical Technology and Biomechanics, University of Bern, Bern, Switzerland
| | | | | | - Stefan Winzeck
- Institute for Advanced Study and Department of Computer Science, Technische Universität München, Munich, Germany
| | - Abdul Basit
- Pakistan Institute of Nuclear Science and Technology, Islamabad, Pakistan
| | - Paul Bentley
- Division of Brain Sciences, Department of Medicine, Imperial College London, UK
| | - Liang Chen
- Biomedical Image Analysis Group, Department of Computing, Imperial College London, UK
- Division of Brain Sciences, Department of Medicine, Imperial College London, UK
| | - Daan Christiaens
- ESAT/PSI, Department of Electrical Engineering, KU Leuven, Belgium
- Medical Imaging Research Center, UZ Leuven, Belgium
| | | | - Karl Egger
- Department of Neuroradiology, University Medical Center Freiburg, Germany
| | - Chaolu Feng
- College of Information Science and Engineering, Northeastern University, Shenyang, Liaoning, China
| | - Ben Glocker
- Biomedical Image Analysis Group, Department of Computing, Imperial College London, UK
| | - Michael Götz
- Junior Group Medical Image Computing, German Cancer Research Center, Heidelberg, Germany
| | - Tom Haeck
- ESAT/PSI, Department of Electrical Engineering, KU Leuven, Belgium
- Medical Imaging Research Center, UZ Leuven, Belgium
| | - Hanna-Leena Halme
- HUS Medical Imaging Center, Radiology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
- Department of Neuroscience and Biomedical Engineering NBE, Aalto University School of Science, Aalto, Finland
| | | | - Khan M Iftekharuddin
- Vision Lab, Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, VA, USA
| | | | | | - Elias Kellner
- Department of Radiology, Medical Physics, University Medical Center Freiburg, Germany
| | - Antti Korvenoja
- HUS Medical Imaging Center, Radiology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | | | - Christian Ledig
- Biomedical Image Analysis Group, Department of Computing, Imperial College London, UK
| | - Jia-Hong Lee
- Graduate Institute of Biomedical Engineering, National Taiwan University of Science and Technology, Taipei City, Taiwan
| | - Frederik Maes
- ESAT/PSI, Department of Electrical Engineering, KU Leuven, Belgium
- Medical Imaging Research Center, UZ Leuven, Belgium
| | - Qaiser Mahmood
- Signals and Systems, Chalmers University of Technology, Gothenburg, Sweden
- Pakistan Institute of Nuclear Science and Technology, Islamabad, Pakistan
| | - Klaus H Maier-Hein
- Junior Group Medical Image Computing, German Cancer Research Center, Heidelberg, Germany
| | - Richard McKinley
- Department of Diagnostic and Interventional Neuroradiology, Inselspital Bern, Switzerland
| | - John Muschelli
- Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - Chris Pal
- Ecole Polytechnique de Montréal, Canada
| | - Linmin Pei
- Vision Lab, Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, VA, USA
| | - Janaki Raman Rangarajan
- ESAT/PSI, Department of Electrical Engineering, KU Leuven, Belgium
- Medical Imaging Research Center, UZ Leuven, Belgium
| | - Syed M S Reza
- Vision Lab, Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, VA, USA
| | - David Robben
- ESAT/PSI, Department of Electrical Engineering, KU Leuven, Belgium
- Medical Imaging Research Center, UZ Leuven, Belgium
| | - Daniel Rueckert
- Biomedical Image Analysis Group, Department of Computing, Imperial College London, UK
| | - Eero Salli
- HUS Medical Imaging Center, Radiology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Paul Suetens
- ESAT/PSI, Department of Electrical Engineering, KU Leuven, Belgium
- Medical Imaging Research Center, UZ Leuven, Belgium
| | - Ching-Wei Wang
- Graduate Institute of Biomedical Engineering, National Taiwan University of Science and Technology, Taipei City, Taiwan
| | - Matthias Wilms
- Institut for Medical Informatics, University of Lübeck, Lübeck, Germany
| | - Jan S Kirschke
- Department of Neuroradiology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Ulrike M Kr Amer
- Department of Neurology, University of Lübeck, Germany
- Institute of Psychology II, University of Lübeck, Germany
| | | | - Peter Schramm
- Institute of Neuroradiology, University Medical Center Lübeck
| | - Roland Wiest
- Department of Diagnostic and Interventional Neuroradiology, Inselspital Bern, Switzerland
| | - Heinz Handels
- Institut for Medical Informatics, University of Lübeck, Lübeck, Germany
| | - Mauricio Reyes
- Institute for Surgical Technology and Biomechanics, University of Bern, Bern, Switzerland
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