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Roymuhury SK, Mandal M, Chakraborty D, Ramkumar V. Homoleptic titanium and zirconium complexes exhibiting unusual Oiminol–metal coordination: application in stereoselective ring-opening polymerization of lactide. Polym Chem 2021. [DOI: 10.1039/d1py00237f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The synthesis and characterization of novel homoleptic Ti and Zr complexes with tridentate ONO-type Schiff base ligands and their catalytic activities towards the ring-opening polymerization (ROP) of lactide are reported.
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Affiliation(s)
- Sagnik K. Roymuhury
- Department of Chemistry
- Indian Institute of Technology Patna
- Bihta 801103
- India
| | - Mrinmay Mandal
- Department of Chemistry
- Indian Institute of Technology Patna
- Bihta 801103
- India
| | - Debashis Chakraborty
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai-600 036
- India
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2
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Zou XR, Chang YN, Huang KW, Liang LC. Enhanced Reactivity of Aluminum Complexes Containing P-Bridged Biphenolate Ligands in Ring-Opening Polymerization Catalysis. Front Chem 2019; 6:607. [PMID: 30619816 PMCID: PMC6300491 DOI: 10.3389/fchem.2018.00607] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Accepted: 11/26/2018] [Indexed: 11/28/2022] Open
Abstract
Aluminum complexes containing [RP(O)(2-O-3,5-tBu2C6H2)2]2− [R = tBu (3a), Ph (3b)] have been synthesized, structurally characterized, and their reactivity studied in comparison with those of their [RP(2-O-3,5-tBu2C6H2)2]2− [R = tBu (2a), Ph (2b)] analogs. Treating AlMe3 with one equiv of H2[3a-b] in THF at 0°C affords quantitatively [3a-b]AlMe, subsequent reactions of which with benzyl alcohol in THF at 25°C generate {[3a-b]Al(μ2-OCH2Ph)}2. The methyl [3a-b]AlMe and the benzyloxide {[3a-b]Al(μ2-OCH2Ph)}2 are all active for catalytic ring-opening polymerization (ROP) of ε-caprolactone and rac-lactide (rac-LA). Controlled experiments reveal that {[3a]Al(μ2-OCH2Ph)}2 is competent in living polymerization. Kinetic studies indicate that [3a]AlMe, in the presence of benzyl alcohol, catalyzes ROP of rac-LA at a rate faster than [3b]AlMe and [2a]AlMe(THF) by a factor of 1.8 and 23.6, respectively, highlighting the profound reactivity enhancement in ROP catalysis by varying the P-substituents of these biphenolate complexes of aluminum.
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Affiliation(s)
- Xue-Ru Zou
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung, Taiwan
| | - Yu-Ning Chang
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung, Taiwan
| | - Kuo-Wei Huang
- KAUST Catalysis Center and Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Lan-Chang Liang
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung, Taiwan.,Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung, Taiwan
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3
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Mandal M, Ramkumar V, Chakraborty D. Salen complexes of zirconium and hafnium: synthesis, structural characterization and polymerization studies. Polym Chem 2019. [DOI: 10.1039/c8py01750f] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Salen complexes of zirconium and hafnium were synthesized and used as effective catalysts for the polymerization of lactide and ε-CL and homopolymerization, copolymerization and coupling of epoxides with CO2.
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Affiliation(s)
- Mrinmay Mandal
- Department of Chemistry
- Indian Institute of Technology Patna
- Bihta 801103
- India
| | | | - Debashis Chakraborty
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai-600 036
- India
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4
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Rajashekhar B, Mandal M, Chakraborty D, Ramkumar V. Homoleptic Zr and Hf Complexes of Imino/Bis(imino)phenoxide Scaffolds: Synthesis, Structural Characterization and Their Catalytic Activity in the ROP of Cyclic Esters. ChemistrySelect 2017. [DOI: 10.1002/slct.201701602] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Bijja Rajashekhar
- Department of Chemistry; Indian Institute of Technology Madras; Chennai- 600 036, Tamil Nadu India
| | - Mrinmay Mandal
- Department of Chemistry; Indian Institute of Technology Patna; Bihta 801103, Bihar India
| | - Debashis Chakraborty
- Department of Chemistry; Indian Institute of Technology Madras; Chennai- 600 036, Tamil Nadu India
| | - Venkatachalam Ramkumar
- Department of Chemistry; Indian Institute of Technology Madras; Chennai- 600 036, Tamil Nadu India
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5
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Higuchi M, Kanazawa A, Aoshima S. Concurrent Cationic Vinyl-Addition and Coordination Ring-Opening Copolymerization via Orthogonal Propagation and Transient Merging at the Propagating Chain End. ACS Macro Lett 2017; 6:365-369. [PMID: 35610844 DOI: 10.1021/acsmacrolett.7b00095] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Controlled cationic vinyl-addition polymerization of an alkyl vinyl ether (VE) and ring-opening polymerization of ε-caprolactone (CL) simultaneously proceeded using HfCl4/Hf(OBu)4 as a dual-role catalyst for both mechanisms, yielding a graft copolymer consisting of a poly(VE) main chain and several poly(CL) side chains. The copolymer of conventionally incompatible monomers was generated via the unprecedented mechanisms consisting of orthogonal propagating reactions and transient merging. Specifically, the poly(CL) chains were incorporated into a poly(VE) chain through an exchange reaction between the VE-derived alkoxy group and the propagating poly(CL) chain at the acetal moiety of the propagating end of the poly(VE) chain. An appropriate ratio of HfCl4 and Hf(OBu)4 was indispensable for both the simultaneous vinyl-addition and ring-opening polymerizations and the alkoxy group exchange reaction.
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Affiliation(s)
- Motoki Higuchi
- Department of Macromolecular
Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Arihiro Kanazawa
- Department of Macromolecular
Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Sadahito Aoshima
- Department of Macromolecular
Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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6
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Chou KW, Su WJ, Huang HF, Zou XR, Chang YN, Lee PY, Liang LC. Titanium, hafnium, and tantalum complexes of a potentially triphenolate phosphine ligand that is unexpectedly prone to O-protonation. Polyhedron 2017. [DOI: 10.1016/j.poly.2016.11.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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7
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Hu M, Han F, Zhang W, Ma W, Deng Q, Song W, Yan H, Dong G. Preparation of zirconium and hafnium complexes containing chiral N atoms from asymmetric tertiary amine ligands, and their catalytic properties for polymerization of rac-lactide. Catal Sci Technol 2017. [DOI: 10.1039/c6cy02618d] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Preparation of Zr and Hf complexes containing chiral N atoms, and their use in polymerization of rac-lactide.
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Affiliation(s)
- Minggang Hu
- College of Chemistry and Chemical Engineering
- Qiqihar University
- Qiqihar 161006
- China
| | - Fuzhong Han
- College of Chemistry and Chemical Engineering
- Qiqihar University
- Qiqihar 161006
- China
| | - Wenzhi Zhang
- College of Chemistry and Chemical Engineering
- Qiqihar University
- Qiqihar 161006
- China
| | - Wenhui Ma
- College of Chemistry and Chemical Engineering
- Qiqihar University
- Qiqihar 161006
- China
| | - Qigang Deng
- College of Chemistry and Chemical Engineering
- Qiqihar University
- Qiqihar 161006
- China
| | - Weiming Song
- College of Chemistry and Chemical Engineering
- Qiqihar University
- Qiqihar 161006
- China
| | - Hailong Yan
- Qiqihar Environmental Protection Bureau Monitoring Center
- Qiqihar 161005
- China
| | - Guohua Dong
- College of Chemistry and Chemical Engineering
- Qiqihar University
- Qiqihar 161006
- China
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8
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Du MR, Zhang XB, Si SM, Wang L. Theoretical insights into the reaction of Cp*(Cl)Hf(diene) with isonitriles. RSC Adv 2017. [DOI: 10.1039/c7ra08981c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
The reaction of Cp*(Cl)Hf(2,3-dimethylbutadiene) with isonitriles is theoretically investigated, and detailed elementary reactions and the substitution effects are examined.
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Affiliation(s)
- Ming-Ran Du
- School of Chemical Engineering
- Anhui University of Science and Technology
- Huainan
- People's Republic of China
| | - Xiang-Biao Zhang
- School of Chemical Engineering
- Anhui University of Science and Technology
- Huainan
- People's Republic of China
| | - Sheng-Meng Si
- School of Chemical Engineering
- Anhui University of Science and Technology
- Huainan
- People's Republic of China
| | - Lei Wang
- Department of Chemistry
- Huaibei Normal University
- Huaibei
- People's Republic of China
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9
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Chang YN, Lee PY, Zou XR, Huang HF, Chen YW, Liang LC. Aluminum complexes containing biphenolate phosphine ligands: synthesis and living ring-opening polymerization catalysis. Dalton Trans 2016; 45:15951-15962. [PMID: 27406437 DOI: 10.1039/c6dt02143c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
This report describes the synthesis, structure, and reactivity of aluminum complexes containing tridentate biphenolate phosphine ligands of the type [RP(2-O-3,5-C6H2tBu2)2]2- (R = tBu (2a), Ph (2b)). Alkane elimination of AlMe3 with one equiv. of H2[2a] or H2[2b] in THF at 0 °C cleanly affords colorless crystalline [2a]AlMe(THF) (3a) and [2b]AlMe(THF) (3b), respectively. An X-ray diffraction study of 3a showed it to be a five-coordinate THF-bound species, whose coordination geometry is best described as trigonal bipyramidal, having the phosphorus donor and THF at axial positions. Treatment of either in situ prepared or isolated methyl complexes 3a,b with one equiv. of benzyl alcohol in toluene or THF generated their corresponding benzyloxides {[2a,b]Al(μ2-OCH2Ph)}2 (4a,b). An X-ray diffraction study of 4a revealed a dimeric structure, in which the coordination geometry of aluminum is also distorted trigonal bipyramidal with the tridentate 2a ligand being facially bound. In the presence of one equiv. of benzyl alcohol, complex 3a is a competent catalyst precursor for the living ring-opening polymerization of ε-caprolactone (ε-CL) and rac-lactide (rac-LA), producing poly(ε-caprolactone) and poly(rac-lactide), respectively, in a controlled manner. As such, well-defined block copolymers of ε-CL with rac-LA can also be prepared by catalytic 3a. Kinetic studies revealed that 3a catalyzes the polymerization of rac-lactide at a rate 2-fold faster than that of 3b, indicating the significance of the P-substituent effect on this catalysis. Interestingly, the polymerization rate of rac-lactide by 3a is 16.5 times faster than that of l-lactide under otherwise identical conditions.
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Affiliation(s)
- Yu-Ning Chang
- Department of Chemistry and Center for Nanoscience & Nanotechnology, National Sun Yat-sen University, Kaohsiung 80424, Taiwan.
| | - Pei-Ying Lee
- Department of Chemistry and Center for Nanoscience & Nanotechnology, National Sun Yat-sen University, Kaohsiung 80424, Taiwan.
| | - Xue-Ru Zou
- Department of Chemistry and Center for Nanoscience & Nanotechnology, National Sun Yat-sen University, Kaohsiung 80424, Taiwan.
| | - Han-Fan Huang
- Department of Chemistry and Center for Nanoscience & Nanotechnology, National Sun Yat-sen University, Kaohsiung 80424, Taiwan.
| | - Yi-Wei Chen
- Department of Chemistry and Center for Nanoscience & Nanotechnology, National Sun Yat-sen University, Kaohsiung 80424, Taiwan.
| | - Lan-Chang Liang
- Department of Chemistry and Center for Nanoscience & Nanotechnology, National Sun Yat-sen University, Kaohsiung 80424, Taiwan. and Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
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Vuppalapati GP, Rathore RS, Pathak M, Kulathu Iyer S. Hepta-coordinated heteroleptic derivatives of zirconium(IV): Synthesis, structural characterization and ring opening polymerization of ε-caprolactone. Polyhedron 2016. [DOI: 10.1016/j.poly.2016.01.035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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11
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Mandal D, Chakraborty D, Ramkumar V, Chand DK. Group 4 alkoxide complexes containing [NNO]-type scaffold: synthesis, structural characterization and polymerization studies. RSC Adv 2016. [DOI: 10.1039/c5ra26721h] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A series of new dinuclear group 4 complexes containing [NNO]-type ligands are utilized as catalysts for polymerization reactions.
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Affiliation(s)
- Dipa Mandal
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600 036
- India
| | - Debashis Chakraborty
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600 036
- India
| | | | - Dillip Kumar Chand
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600 036
- India
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12
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Mandal M, Monkowius U, Chakraborty D. Synthesis and structural characterization of titanium and zirconium complexes containing half-salen ligands as catalysts for polymerization reactions. NEW J CHEM 2016. [DOI: 10.1039/c6nj02148d] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Ti(iv) and Zr(iv) complexes of tridentate half-salen ligands were synthesized for the polymerization of lactide and ε-CL, homopolymerization, copolymerization and coupling of epoxides with CO2. All the complexes were found to be effective catalysts for different polymerization reactions.
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Affiliation(s)
- Mrinmay Mandal
- Department of Chemistry
- Indian Institute of Technology Patna
- Bihta 801103
- India
| | - Uwe Monkowius
- Institute of Inorganic Chemistry
- Johannes Kepler University Linz
- 4040 Linz
- Austria
| | - Debashis Chakraborty
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai-600 036
- India
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13
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A new class of MPV type reduction in group 4 alkoxide complexes of salicylaldiminato ligands: Efficient catalysts for the ROP of lactides, epoxides and polymerization of ethylene. POLYMER 2015. [DOI: 10.1016/j.polymer.2014.10.074] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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14
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Mandal M, Chakraborty D, Ramkumar V. Zr(iv) complexes containing salan-type ligands: synthesis, structural characterization and role as catalysts towards the polymerization of ε-caprolactone, rac-lactide, ethylene, homopolymerization and copolymerization of epoxides with CO2. RSC Adv 2015. [DOI: 10.1039/c4ra17201a] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Three new Zr(iv) complexes bearing salan-type diamine bis(phenolato) ligands were synthesized and their activities towards the ROP of ε-CL, rac-LA and homopolymerization, copolymerization and coupling of epoxides with CO2 were investigated.
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Affiliation(s)
- Mrinmay Mandal
- Department of Chemistry
- Indian Institute of Technology Patna
- Patna-800 013
- India
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Hung YT, Chen MT, Huang MH, Kao TY, Liu YS, Liang LC. Catalytic Sonogashira couplings mediated by an amido pincer complex of palladium. Inorg Chem Front 2014. [DOI: 10.1039/c3qi00086a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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16
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Tsai CY, Du HC, Chang JC, Huang BH, Ko BT, Lin CC. Ring-opening polymerization of cyclic esters initiated by zirconium, titanium and yttrium complexes. RSC Adv 2014. [DOI: 10.1039/c4ra00201f] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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17
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Liang LC, Chien CC, Chen MT, Lin ST. Zirconium and Hafnium Complexes Containing N-Alkyl-Substituted Amine Biphenolate Ligands: Unexpected Ligand Degradation and Divergent Complex Constitutions Governed by N-Alkyls. Inorg Chem 2013; 52:7709-16. [PMID: 23773167 DOI: 10.1021/ic400891b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lan-Chang Liang
- Department of Chemistry and Center for Nanoscience & Nanotechnology, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Chia-Cheng Chien
- Department of Chemistry and Center for Nanoscience & Nanotechnology, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Ming-Tsz Chen
- Department of Chemistry and Center for Nanoscience & Nanotechnology, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Sheng-Ta Lin
- Department of Chemistry and Center for Nanoscience & Nanotechnology, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
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