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Parra-Cadenas B, Bravo I, Ripoll Lorente MC, Ginés C, Elorriaga D, Carrillo-Hermosilla F. Boron Complexes with Propiolamidinato Ligands: Synthesis, Structure, and Photophysical Properties. Inorg Chem 2024; 63:12120-12132. [PMID: 38873888 PMCID: PMC11220760 DOI: 10.1021/acs.inorgchem.4c01241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2024] [Revised: 06/04/2024] [Accepted: 06/10/2024] [Indexed: 06/15/2024]
Abstract
Two series of boron derivatives with propiolamidinato ligands, [BPh2{C(C≡CAr)(NR)2}] (Ar = Ph, p-MeOPh, p-FPh, p-Me2NPh, or phen; R = iPr or p-tolyl), were synthesized and structurally characterized. The corresponding propiolamidine (or propargylamidine) proligands have been obtained through sustainable methods. One is the catalytic hydroalkynylation of diisopropylcarbodiimide with different terminal alkynes, using simple ZnEt2 as a precatalyst. Alternatively, to obtain propiolamidines with aromatic groups on the nitrogen atoms, the formation of lithiated derivatives of terminal alkynes by reaction with n-BuLi in air and at room temperature, and subsequent addition to the di-p-tolylcarbodiimide, under the same conditions and using 2-MeTHF as a sustainable solvent, has been used for the first time. After reaction with BPh3, the corresponding boron amidinates were obtained, which are emissive in the solution state. The influence of the different substituents introduced into the ligands on the photophysical properties of the boron compounds has been studied. One of the obtained compounds can be used as a ratiometric fluorescent pH sensor in the acidic range.
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Affiliation(s)
- Blanca Parra-Cadenas
- Departamento
de Química Inorgánica, Orgánica y Bioquímica-Centro
de Innovación en Química Avanzada (ORFEO-CINQA), Facultad
de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
| | - Iván Bravo
- Grupo
FOTOAIR, Unidad nanoDrug, Departamento de Química-Física,
Facultad de Farmacia de Albacete, Universidad
de Castilla-La Mancha, 02008 Albacete, Spain
| | - M. Consuelo Ripoll Lorente
- Grupo
FOTOAIR, Unidad nanoDrug, Departamento de Química-Física,
Facultad de Farmacia de Albacete, Universidad
de Castilla-La Mancha, 02008 Albacete, Spain
| | - Carlos Ginés
- Departamento
de Química Inorgánica, Orgánica y Bioquímica-Centro
de Innovación en Química Avanzada (ORFEO-CINQA), Facultad
de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
| | - David Elorriaga
- Departamento
de Química Orgánica e Inorgánica, Universidad de Oviedo, Julián Clavería 8, 33006 Oviedo, Spain
| | - Fernando Carrillo-Hermosilla
- Departamento
de Química Inorgánica, Orgánica y Bioquímica-Centro
de Innovación en Química Avanzada (ORFEO-CINQA), Facultad
de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
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2
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Hand AT, Lamb AC, Richmond MG, Wang X, Steren CA, Xue ZL. Syntheses of Group 5 Amide Amidinates and Their Reactions with Water: Different Reactivities of Nb(V) and Ta(V) Complexes. Inorg Chem 2022; 61:19075-19087. [DOI: 10.1021/acs.inorgchem.2c02365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Adam T. Hand
- Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Adam C. Lamb
- Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Michael G. Richmond
- Department of Chemistry, The University of North Texas, Denton, Texas 76203, United States
| | - Xiaoping Wang
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Carlos A. Steren
- Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Zi-Ling Xue
- Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996, United States
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3
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Robinson TP, Georges M, Turner ZR, Buffet JC, O’Hare D. Zirconium Permethylpentalene Amidinate Complexes: Characterization, Bonding, and Olefin Polymerization Catalysis. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thomas P. Robinson
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Maureen Georges
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Zoë R. Turner
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Jean-Charles Buffet
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Dermot O’Hare
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
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4
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Homogeneous Group IVB Catalysts of New Generations for Synthesis of Ethylene-Propylene-Diene Rubbers: A Mini-Review. Catalysts 2022. [DOI: 10.3390/catal12070704] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Ethylene-propylene-diene rubbers (EPDM) are one of the most important polyolefin materials widely commercialized and used in various industries in recent years. The production of EPDM is based solely on catalytic coordination polymerization processes. The development of new catalysts and processes for the synthesis of EPDM has expanded the range of products and their manufacturing in terms of energy efficiency, processability, and environmental safety. This mini-review mainly analyzes patented data on the synthesis of EPDM on new-generation single-site catalytic systems based on Group IVB complexes including the systems commercialized by major manufacturers of EPDM. The advantages of these systems are evident in comparison with conventional vanadium systems introduced into production in the 1960s and used to date in the industrial synthesis of EPDM.
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5
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Auriemma F, Scoti M, De Stefano F, Talarico G, Ruiz de Ballesteros O, Di Girolamo R, Malafronte A, De Rosa C, Cipullo R, Van Duin M. Microstructural insight on strain-induced crystallization of ethylene/propylene(/diene) random copolymers. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.123848] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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6
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Ashuiev A, Allouche F, Wili N, Searles K, Klose D, Copéret C, Jeschke G. Molecular and supported Ti(iii)-alkyls: efficient ethylene polymerization driven by the π-character of metal-carbon bonds and back donation from a singly occupied molecular orbital. Chem Sci 2020; 12:780-792. [PMID: 34163812 PMCID: PMC8178971 DOI: 10.1039/d0sc04436a] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
While Ti(iii) alkyl species are the proposed active sites in Ziegler–Natta ethylene polymerization catalysts, the corresponding well-defined homogeneous catalysts are not known. We report that well-defined neutral β-diiminato Ti(iii) alkyl species, namely [Ti(nacnac)(CH2tBu)2] and its alumina-grafted derivative [(AlsO)Ti(nacnac)(CH2tBu)], are active towards ethylene polymerization at moderate pressures and temperatures and possess an electron configuration well-adapted to insertion of ethylene. Advanced EPR spectroscopy showed that ethylene insertion into a Ti(iii)–C bond takes place during polymerization from Ti(nacnac)(CH2tBu)2. A combination of pulsed EPR spectroscopy and DFT calculations, based on a crystal structure of [Ti(nacnac)(CH2tBu)2], enabled us to reveal details about the structure and electronic configurations of both molecular and surface-grafted species. For both compounds, the α-agostic C–H interaction, which involves the singly occupied molecular orbital, indicates a π character of the metal–carbon bond; this π character is enhanced upon ethylene coordination, leading to a nearly barrier-less C2H4 insertion into Ti(iii)–C bonds after this first step. During coordination, back donation from the SOMO to the π*(C2H4) occurs, leading to stabilization of π-ethylene complexes and to a significant lowering of the overall energy of the C2H4 insertion transition state. In d1 alkyl complexes, ethylene insertion follows an original “augmented” Cossee–Arlman mechanism that involves the delocalization of unpaired electrons between the SOMO, π*(C2H4) and σ*(Ti–C) in the transition state, which further favors ethylene insertion. All these factors facilitate ethylene polymerization on Ti(iii) neutral alkyl species and make d1 alkyl complexes potentially more effective polymerization catalysts than their d0 analogues. Ti(iii) alkyl species polymerize ethylene via an original mechanism, which involves back donation to the π*(C2H4) and a delocalization of the unpaired electron in the transition state of C2H4 insertion into the partially alkylidenic Ti(iii)–C bond.![]()
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Affiliation(s)
- Anton Ashuiev
- Department of Chemistry and Applied Biosciences, ETH Zürich Vladimir Prelog Weg 1-5 CH-8093 Zürich Switzerland
| | - Florian Allouche
- Department of Chemistry and Applied Biosciences, ETH Zürich Vladimir Prelog Weg 1-5 CH-8093 Zürich Switzerland
| | - Nino Wili
- Department of Chemistry and Applied Biosciences, ETH Zürich Vladimir Prelog Weg 1-5 CH-8093 Zürich Switzerland
| | - Keith Searles
- Department of Chemistry and Applied Biosciences, ETH Zürich Vladimir Prelog Weg 1-5 CH-8093 Zürich Switzerland
| | - Daniel Klose
- Department of Chemistry and Applied Biosciences, ETH Zürich Vladimir Prelog Weg 1-5 CH-8093 Zürich Switzerland
| | - Christophe Copéret
- Department of Chemistry and Applied Biosciences, ETH Zürich Vladimir Prelog Weg 1-5 CH-8093 Zürich Switzerland
| | - Gunnar Jeschke
- Department of Chemistry and Applied Biosciences, ETH Zürich Vladimir Prelog Weg 1-5 CH-8093 Zürich Switzerland
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7
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Bravaya NM, Faingol’d EE, Badamshina ER, Sanginov EA. Advances in Synthesis of Ethylene–Propylene–Diene Elastomers by Ion-Coordination Polymerization on Single-Site Catalytic Systems of New Generation. POLYMER SCIENCE SERIES C 2020. [DOI: 10.1134/s1811238220010014] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Chotard F, Lapenta R, Bolley A, Trommenschlager A, Balan C, Bayardon J, Malacea-Kabbara R, Bonnin Q, Bodio E, Cattey H, Richard P, Milione S, Grassi A, Dagorne S, Le Gendre P. Phenoxyamidine Zn and Al Complexes: Synthesis, Characterization, and Use in the Ring-Opening Polymerization of Lactide. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00501] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Florian Chotard
- Institut de Chimie Moléculaire de l’Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université Bourgogne Franche-Comté 25000 Besançon, France
| | - Rosita Lapenta
- Institut de Chimie de Strasbourg (UMR-CNRS 7177), Université de Strasbourg, F-67081 Strasbourg cedex, France
- Dipartimento di Chimica e Biologia, Università degli Studi di Salerno, via Giovanni Paolo II, 132-84084 Fisciano (SA), Italy
| | - Anaëlle Bolley
- Institut de Chimie de Strasbourg (UMR-CNRS 7177), Université de Strasbourg, F-67081 Strasbourg cedex, France
| | - Audrey Trommenschlager
- Institut de Chimie Moléculaire de l’Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université Bourgogne Franche-Comté 25000 Besançon, France
| | - Cédric Balan
- Institut de Chimie Moléculaire de l’Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université Bourgogne Franche-Comté 25000 Besançon, France
| | - Jérôme Bayardon
- Institut de Chimie Moléculaire de l’Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université Bourgogne Franche-Comté 25000 Besançon, France
| | - Raluca Malacea-Kabbara
- Institut de Chimie Moléculaire de l’Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université Bourgogne Franche-Comté 25000 Besançon, France
| | - Quentin Bonnin
- Institut de Chimie Moléculaire de l’Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université Bourgogne Franche-Comté 25000 Besançon, France
| | - Ewen Bodio
- Institut de Chimie Moléculaire de l’Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université Bourgogne Franche-Comté 25000 Besançon, France
| | - Hélène Cattey
- Institut de Chimie Moléculaire de l’Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université Bourgogne Franche-Comté 25000 Besançon, France
| | - Philippe Richard
- Institut de Chimie Moléculaire de l’Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université Bourgogne Franche-Comté 25000 Besançon, France
| | - Stefano Milione
- Dipartimento di Chimica e Biologia, Università degli Studi di Salerno, via Giovanni Paolo II, 132-84084 Fisciano (SA), Italy
| | - Alfonso Grassi
- Dipartimento di Chimica e Biologia, Università degli Studi di Salerno, via Giovanni Paolo II, 132-84084 Fisciano (SA), Italy
| | - Samuel Dagorne
- Institut de Chimie de Strasbourg (UMR-CNRS 7177), Université de Strasbourg, F-67081 Strasbourg cedex, France
| | - Pierre Le Gendre
- Institut de Chimie Moléculaire de l’Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université Bourgogne Franche-Comté 25000 Besançon, France
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9
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Kulyabin PS, Goryunov GP, Mladentsev DY, Uborsky DV, Voskoboynikov AZ, Canich JAM, Hagadorn JR. Reactivity of
C
1
‐Symmetric Heteroarylamido Hafnium Complexes towards Unsaturated Electrophilic Molecules: Development of New Families of Olefin Polymerization Catalysts. Chemistry 2019; 25:10478-10489. [DOI: 10.1002/chem.201901899] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Revised: 05/29/2019] [Indexed: 11/09/2022]
Affiliation(s)
- Pavel S. Kulyabin
- Department of ChemistryM. V. Lomonosov Moscow State University Leninskie Gory, 1/3 Moscow 119991 Russian Federation
| | - Georgy P. Goryunov
- Department of ChemistryM. V. Lomonosov Moscow State University Leninskie Gory, 1/3 Moscow 119991 Russian Federation
| | - Dmitry Y. Mladentsev
- Department of ChemistryM. V. Lomonosov Moscow State University Leninskie Gory, 1/3 Moscow 119991 Russian Federation
| | - Dmitry V. Uborsky
- Department of ChemistryM. V. Lomonosov Moscow State University Leninskie Gory, 1/3 Moscow 119991 Russian Federation
| | - Alexander Z. Voskoboynikov
- Department of ChemistryM. V. Lomonosov Moscow State University Leninskie Gory, 1/3 Moscow 119991 Russian Federation
| | - Jo Ann M. Canich
- Baytown Technology and Engineering ComplexExxonMobil Chemical Company Baytown TX 77520 USA
| | - John R. Hagadorn
- Baytown Technology and Engineering ComplexExxonMobil Chemical Company Baytown TX 77520 USA
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10
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Zaccaria F, Zuccaccia C, Cipullo R, Budzelaar PHM, Macchioni A, Busico V, Ehm C. BHT-Modified MAO: Cage Size Estimation, Chemical Counting of Strongly Acidic Al Sites, and Activation of a Ti-Phosphinimide Precatalyst. ACS Catal 2019. [DOI: 10.1021/acscatal.9b00076] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Francesco Zaccaria
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Via Cintia, 80126 Napoli, Italy
- Dipartimento di Chimica, Biologia e Biotecnologie and CIRCC, Università di Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Cristiano Zuccaccia
- Dipartimento di Chimica, Biologia e Biotecnologie and CIRCC, Università di Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Roberta Cipullo
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Via Cintia, 80126 Napoli, Italy
| | - Peter H. M. Budzelaar
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Via Cintia, 80126 Napoli, Italy
| | - Alceo Macchioni
- Dipartimento di Chimica, Biologia e Biotecnologie and CIRCC, Università di Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Vincenzo Busico
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Via Cintia, 80126 Napoli, Italy
| | - Christian Ehm
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Via Cintia, 80126 Napoli, Italy
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11
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Yu X, Li M, Hong J, Zhou X, Zhang L. Living 3,4‐(Co)Polymerization of Isoprene/Myrcene and One‐Pot Synthesis of a Polyisoprene Blend Catalyzed by Binuclear Rare‐Earth Metal Amidinate Complexes. Chemistry 2019; 25:2569-2576. [PMID: 30537360 DOI: 10.1002/chem.201804944] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Revised: 11/23/2018] [Indexed: 11/08/2022]
Affiliation(s)
- Xiaying Yu
- Department of ChemistryShanghai Key Laboratory of, Molecular Catalysis and Innovative MaterialsFudan University Shanghai 200438 China
| | - Meng Li
- Department of ChemistryShanghai Key Laboratory of, Molecular Catalysis and Innovative MaterialsFudan University Shanghai 200438 China
| | - Jianquan Hong
- Department of ChemistryShanghai Key Laboratory of, Molecular Catalysis and Innovative MaterialsFudan University Shanghai 200438 China
| | - Xigeng Zhou
- Department of ChemistryShanghai Key Laboratory of, Molecular Catalysis and Innovative MaterialsFudan University Shanghai 200438 China
- State Key Laboratory of Organometallic Chemistry Shanghai 200032 China
| | - Lixin Zhang
- Department of ChemistryShanghai Key Laboratory of, Molecular Catalysis and Innovative MaterialsFudan University Shanghai 200438 China
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12
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Rios Yepes Y, Quintero C, Osorio Meléndez D, Daniliuc CG, Martínez J, Rojas RS. Cyclic Carbonates from CO2 and Epoxides Catalyzed by Tetra- and Pentacoordinate Amidinate Aluminum Complexes. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00795] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Yersica Rios Yepes
- Laboratorio de Química Inorgánica, Facultad de Química, Universidad Católica de Chile, Casilla 306, Santiago 22 6094411, Chile
| | - Celso Quintero
- Laboratorio de Química Inorgánica, Facultad de Química, Universidad Católica de Chile, Casilla 306, Santiago 22 6094411, Chile
| | - Danay Osorio Meléndez
- Laboratorio de Química Inorgánica, Facultad de Química, Universidad Católica de Chile, Casilla 306, Santiago 22 6094411, Chile
| | | | - Javier Martínez
- Laboratorio de Química Inorgánica, Facultad de Química, Universidad Católica de Chile, Casilla 306, Santiago 22 6094411, Chile
| | - René S. Rojas
- Laboratorio de Química Inorgánica, Facultad de Química, Universidad Católica de Chile, Casilla 306, Santiago 22 6094411, Chile
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13
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Meléndez DO, Lara-Sánchez A, Martínez J, Wu X, Otero A, Castro-Osma JA, North M, Rojas RS. Amidinate Aluminium Complexes as Catalysts for Carbon Dioxide Fixation into Cyclic Carbonates. ChemCatChem 2018. [DOI: 10.1002/cctc.201702014] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Danay Osorio Meléndez
- Nucleus Millennium Chemical Processes and Catalysis (CPC); Laboratorio de Química Inorgánica; Facultad de Química; Universidad Católica de Chile; Casilla 306 Santiago-22 6094411 Chile
| | - Agustín Lara-Sánchez
- Departamento de Química Inorgánica, Orgánica y Bioquímica; Centro de Innovación en Química Avanzada (ORFEO-CINQA); Facultad de Ciencias y Tecnologías Químicas; Universidad de Castilla-La Mancha; Campus Universitario 13071- Ciudad Real Spain
| | - Javier Martínez
- Departamento de Química Inorgánica, Orgánica y Bioquímica; Centro de Innovación en Química Avanzada (ORFEO-CINQA); Facultad de Ciencias y Tecnologías Químicas; Universidad de Castilla-La Mancha; Campus Universitario 13071- Ciudad Real Spain
| | - Xiao Wu
- Green Chemistry Centre of Excellence; Department of Chemistry; The University of York; York YO10 5DD UK
| | - Antonio Otero
- Departamento de Química Inorgánica, Orgánica y Bioquímica; Centro de Innovación en Química Avanzada (ORFEO-CINQA); Facultad de Ciencias y Tecnologías Químicas; Universidad de Castilla-La Mancha; Campus Universitario 13071- Ciudad Real Spain
| | - José A. Castro-Osma
- Departamento de Química Inorgánica, Orgánica y Bioquímica; Centro de Innovación en Química Avanzada (ORFEO-CINQA); Facultad de Farmacia; Universidad de Castilla-La Mancha; 02071- Albacete Spain
| | - Michael North
- Green Chemistry Centre of Excellence; Department of Chemistry; The University of York; York YO10 5DD UK
| | - René S. Rojas
- Nucleus Millennium Chemical Processes and Catalysis (CPC); Laboratorio de Química Inorgánica; Facultad de Química; Universidad Católica de Chile; Casilla 306 Santiago-22 6094411 Chile
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14
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Gao Y, Chen X, Zhang J, Chen J, Lohr TL, Marks TJ. Catalyst Nuclearity Effects on Stereo- and Regioinduction in Pyridylamidohafnium-Catalyzed Propylene and 1-Octene Polymerizations. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b00181] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Yanshan Gao
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Xia Chen
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China
| | - Jialong Zhang
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Jiazhen Chen
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Tracy L. Lohr
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Tobin J. Marks
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
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15
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Senthilnathan D, Solomon RV, Kiruthika S, Venuvanalingam P, Sundararajan M. Are cucurbiturils better drug carriers for bent metallocenes? Insights from theory. J Biol Inorg Chem 2018; 23:413-423. [PMID: 29502216 DOI: 10.1007/s00775-018-1547-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Accepted: 02/23/2018] [Indexed: 02/06/2023]
Abstract
Bent metallocenes (BM) have anti-tumor properties but they face a serious drug efficacy problem due to poor aqueous solubility and rapid hydrolysis under physiological conditions. These two problems can be fixed by encapsulating them in host molecules such as cyclodextrin (CD), cucurbituril (CB) etc. Experimentally, CD-BM, CB-BM host-guest complexes have been investigated to check the efficiency of the drug delivery and efficiency of the encapsulated drug. CB has been reported to be a better host than CD but the reasons for this has not been figured out. This can be done by finding out the mechanism of binding and the nature of the binding forces in both the inclusion complexes. This is exactly done here by performing a DFT study at BP86/TZP level on CB-BM host-guest systems. For comparison CD-BM with β-cyclodextrin as host have been studied. Four BMs (Cp2MCl2, M=Ti, V, Nb, Mo) and their corresponding cations (Cp2MCl+, Cp2M2+) are chosen as guests and they are encapsulated into cucurbit-[6]-uril (CB[6]) and cucurbit-[7]-uril(CB[7]) host systems. Computations reveal that CB[7] accommodates well the BMs over CB[6] due to their larger cavity size and also CB[7] is found to be a better host than β-cyclodextrin. BMs enter vertically rather than horizontally into the CB cavity. The reversible binding of BMs within CB[7] is controlled by various non-bonding interactions and mainly by hydrogen bonding between the portal oxygen atoms and Cp protons as revealed by QTAIM analysis. On the other hand, the interaction between the wall nitrogen atoms in CB[7] and chlorine atoms attached to the metal in BM strengthens the M-Cl bonds that prevents rapid hydrolysis of M-Cl and M-Cp bonds saving the drug. Comparatively, BMs experience less electrostatic attraction and more Pauli repulsion within β-cyclodextrin cavity and this affects the drug binding with CD. This makes β-cyclodextrin a less suitable drug carrier for BMs than CBs. Among the four BMs, niobocene binds strongly and titanocene binds weakly with CBs. EDA clearly shows that all the interactions between the guest and host are non-covalent in nature and electrostatic interactions outperform high-repulsion resulting in stable complexes. Cations form stronger complexes than neutral BMs. FMO analysis reveals that neutral BMs are less reactive compared to their cations and complexes are more reactive in CB[6] environment due to excess strain. QTAIM analysis helps to bring out the newer insights in these types of host-guest systems.
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Affiliation(s)
- Dhurairajan Senthilnathan
- Center for Computational Chemistry, CRD, PRIST University, Vallam, Thanjavur, Tamilnadu, 613403, India.
| | - Rajadurai Vijay Solomon
- Department of Chemistry, Madras Christian College (Autonomous), Tambaram East, Chennai, 600 059, India
| | - Shanmugam Kiruthika
- Theoretical and Computational Chemistry Laboratory, School of Chemistry, Bharathidasan University, Tiruchirappalli, 620 024, India
| | - Ponnambalam Venuvanalingam
- Theoretical and Computational Chemistry Laboratory, School of Chemistry, Bharathidasan University, Tiruchirappalli, 620 024, India
| | - Mahesh Sundararajan
- Theoretical Chemistry Section, Bhabha Atomic Research Centre, Mumbai, 400 085, India
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16
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Zhang D, Liu R, Zhou X. Intramolecular alkene hydroamination and degradation of amidines: divergent behavior of rare earth metal amidinate intermediates. Catal Sci Technol 2018. [DOI: 10.1039/c8cy01481g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The methods for catalytic intramolecular alkene hydroamination and degradation of amidines have been established. Furthermore, a tandem reconstruction/cyclization of amidines has also been developed.
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Affiliation(s)
- Dexing Zhang
- Department of Chemistry
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials
- Fudan University
- Shanghai 200433
- China
| | - Ruiting Liu
- Department of Chemistry
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials
- Fudan University
- Shanghai 200433
- China
| | - Xigeng Zhou
- Department of Chemistry
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials
- Fudan University
- Shanghai 200433
- China
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17
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Zhang ZQ, Qu JT, Zhang S, Miao QP, Wu YX. Ethylene/propylene copolymerization catalyzed by half-titanocenes containing monodentate anionic nitrogen ligands: effect of ligands on catalytic behaviour and structure of copolymers. Polym Chem 2018. [DOI: 10.1039/c7py01807j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ethylene–propylene copolymers with high molecular weight, nearly random sequence distribution and high propylene content could be synthesized by a novel T6/TIBA/MMAO catalytic system.
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Affiliation(s)
- Zhi-Qian Zhang
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Jun-Teng Qu
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Shu Zhang
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Qiu-Ping Miao
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Yi-Xian Wu
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
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