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Alshehri S, Abboud M. Synthesis and characterization of mesoporous silica supported metallosalphen-azobenzene complexes: efficient photochromic heterogeneous catalysts for the oxidation of cyclohexane to produce KA oil. RSC Adv 2024; 14:26971-26994. [PMID: 39193295 PMCID: PMC11348846 DOI: 10.1039/d4ra04698f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2024] [Accepted: 08/06/2024] [Indexed: 08/29/2024] Open
Abstract
The oxidation of cyclohexane to produce KA oil (cyclohexanone and cyclohexanol) is important industrially but faces challenges such as low cyclohexane conversion at high KA oil selectivity, and difficult catalyst recyclability. This work reports the synthesis and evaluation of new heterogeneous catalysts consisting of Co(ii), Mn(ii), Ni(ii) and Cu(ii) salphen-azobenzene complexes [ML1] immobilized on amino-functionalized mesoporous silica (SBA-15, MCM-41, MCM-48) through coordination bonding. In the first step, the salphen-azobenzene ligand was synthesized and complexed with Co, Mn, Ni and Cu metal ions. In the second step, aminopropyltriethoxysilane (APTES) was grafted onto the surface of different types of commercial mesoporous silica. The immobilization of [ML1] onto the mesoporous silica surface and the thermal stability of the obtained materials were confirmed using different characterization techniques such as FT-IR, powder XRD, SEM, TEM, BET, and TGA. The obtained results revealed high dispersion of [ML1] through the silica surface. The catalytic activity of the prepared materials Silica-N-ML1 was evaluated on the cyclohexane oxidation to produce KA oil using various oxidants. The cis-trans isomerization of the azobenzene upon UV irradiation was found to affect the catalytic performance of Silica-N-ML1. The cis isomer of SBA-15-N-CoL1 exhibited the highest cyclohexane conversion (93%) and KA selectivity (92%) under mild conditions (60 °C, 6 h) using m-CPBA as oxidant. Moreover, The SBA-15-N-CoL1 showed high stability during four successive cycles.
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Affiliation(s)
- Salimah Alshehri
- Catalysis Research Group (CRG), Department of Chemistry, College of Science, King Khalid University Abha 61413 Saudi Arabia +966 53 48 46 782
| | - Mohamed Abboud
- Catalysis Research Group (CRG), Department of Chemistry, College of Science, King Khalid University Abha 61413 Saudi Arabia +966 53 48 46 782
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Parsons LW, Berben LA. Expanding the Scope of Aluminum Chemistry with Noninnocent Ligands. Acc Chem Res 2024; 57:1087-1097. [PMID: 38581655 PMCID: PMC11025028 DOI: 10.1021/acs.accounts.3c00714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 03/21/2024] [Accepted: 03/25/2024] [Indexed: 04/08/2024]
Abstract
ConspectusAluminum is the most abundant metal in the earth's crust at 8%, and it is also widely available domestically in many countries worldwide, which ensures a stable supply chain. To further the applications of aluminum (Al), such as in catalysis and electronic and energy storage materials, there has been significant interest in the synthesis and characterization of new Al coordination compounds that can support electron transfer (ET) and proton transfer (PT) chemistry. This has been achieved using redox and chemically noninnocent ligands (NILs) combined with the highly stable M(III) oxidation state of Al and in some cases the heavier group 13 ions, Ga and In.When ligands participate in redox chemistry or facilitate the breaking or making of new bonds, they are often termed redox or chemically noninnocent, respectively. Al(III) in particular supports rich ligand-based redox chemistry because it is so redox inert and will support the ligand across many charge and protonation states without entering into the reaction chemistry. To a lesser extent, we have reported on the heavier group 13 elements Ga and In, and this chemistry will also be included in this Account, where available.This Account is arranged into two technical sections, which are (1) Structures of Al-NIL complexes and (2) Reactivity of Al-NIL complexes. Highlights of the research work include reversible redox chemistry that has been enabled by ligand design to shut down radical coupling pathways and to prevent loss of H2 from unsaturated ligand sites. These reversible redox properties have in turn enabled the characterization of Class III electron delocalization through Al when two NIL are bound to the Al(III) in different charge states. Characterization of the metalloaromatic character of square planar Al and Ga complexes has been achieved, and characterization of the delocalized electronic structures has provided a model within which to understand and predict the ET and PT chemistry of the NIL group 13 compounds. The capacity of Al-NIL complexes to perform ET and PT has been employed in reactions that use ET or PT reactivity only or in reactions where coupled ET/PT affords hydride transfer chemistry. As an example, ligand-based PT reactions initiate metal-ligand cooperative bond activation pathways for catalysis: this includes acceptorless dehydrogenation of formic acid and anilines and transfer hydrogenation chemistry. In a complementary approach, ligand based ET/PT chemistry has been used in the study of dihydropyridinate (DHP-) chemistry where it was shown that N-coordination of group 13 ions lowers kinetic barriers to DHP- formation. Taken together, the discussion presented herein illustrates that the NIL chemistry of Al(III), and also of Ga(III) and In(III) holds promise for further developments in catalysis and energy storage.
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Affiliation(s)
- Leo W.
T. Parsons
- Department of Chemistry, University of California, Davis, California 95616, United States
| | - Louise A. Berben
- Department of Chemistry, University of California, Davis, California 95616, United States
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Pramanik M, Guerzoni MG, Richards E, Melen RL. Recent Advances in Asymmetric Catalysis Using p-Block Elements. Angew Chem Int Ed Engl 2024; 63:e202316461. [PMID: 38038149 DOI: 10.1002/anie.202316461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 11/29/2023] [Accepted: 12/01/2023] [Indexed: 12/02/2023]
Abstract
The development of new methods for enantioselective reactions that generate stereogenic centres within molecules are a cornerstone of organic synthesis. Typically, metal catalysts bearing chiral ligands as well as chiral organocatalysts have been employed for the enantioselective synthesis of organic compounds. In this review, we highlight the recent advances in main group catalysis for enantioselective reactions using the p-block elements (boron, aluminium, phosphorus, bismuth) as a complementary and sustainable approach to generate chiral molecules. Several of these catalysts benefit in terms of high abundance, low toxicity, high selectivity, and excellent reactivity. This minireview summarises the utilisation of chiral p-block element catalysts for asymmetric reactions to generate value-added compounds.
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Affiliation(s)
- Milan Pramanik
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Translational Research Hub, Maindy Road, Cathays, Cardiff, CF24 4HQ, Cymru/Wales, UK
| | - Michael G Guerzoni
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Translational Research Hub, Maindy Road, Cathays, Cardiff, CF24 4HQ, Cymru/Wales, UK
| | - Emma Richards
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Translational Research Hub, Maindy Road, Cathays, Cardiff, CF24 4HQ, Cymru/Wales, UK
| | - Rebecca L Melen
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Translational Research Hub, Maindy Road, Cathays, Cardiff, CF24 4HQ, Cymru/Wales, UK
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Lu Y, Coates GW. Pairing-Enhanced Regioselectivity: Synthesis of Alternating Poly(lactic- co-glycolic acid) from Racemic Methyl-Glycolide. J Am Chem Soc 2023; 145:22425-22432. [PMID: 37793193 DOI: 10.1021/jacs.3c05941] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/06/2023]
Abstract
Poly(lactic-co-glycolic acid) (PLGA) is used in vivo for various biomedical applications. Due to its biodegradability and biocompatibility, PLGA is uniquely suited for controlled drug delivery with parenteral administration. Previously, we established the synthesis of isotactic, alternating PLGA from enantiopure starting materials. Here, to fill in the gap of the current field, we have developed the synthesis of syndioenriched, alternating PLGA from racemic methyl-glycolide (rac-MeG). The synthesis of alternating PLGA is accomplished by a highly regioselective ring-opening polymerization of rac-MeG with an optimized racemic aluminum catalyst. Mechanistic studies are carried out to elucidate the pairing-enhanced catalyst regio- and stereocontrol. Polymer sequence fidelity has been established by NMR investigations, confirming a high degree of alternation of the comonomer sequence and moderate syndiotacticity within the backbone stereoconfiguration. The resulting syndioenriched material is amorphous, which will facilitate the drug complexation behavior.
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Affiliation(s)
- Yiye Lu
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, U.S.A
| | - Geoffrey W Coates
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, U.S.A
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Zaitsev KV, Trubachev AD, Oprunenko YF, Piskun YA, Vasilenko IV, Churakov AV, Kostjuk SV. Aluminum Salen Complexes Modified with Unsaturated Alcohol: Synthesis, Characterization, and Their Activity towards Ring-Opening Polymerization of ε-Caprolactone and D, L-Lactide. Molecules 2023; 28:molecules28031262. [PMID: 36770928 PMCID: PMC9920203 DOI: 10.3390/molecules28031262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 12/21/2022] [Accepted: 01/24/2023] [Indexed: 01/31/2023] Open
Abstract
A highly efficient one-step approach to the macromonomer synthesis using modified aluminum complexes as catalysts of ring-opening polymerization (ROP) of ε-caprolactone and D,L-lactide was developed. The syntheses, structures, and catalytic activities of a wide range of aluminum salen complexes, 3a-c, functionalized with unsaturated alcohol (HO(CH2)4OCH=CH2) are reported. X-Ray diffraction studies revealed a tetragonal pyramidal structure for 3c. Among the complexes 3a-c, the highest activity in bulk ROP of ε-caprolactone and D,L-lactide was displayed by 3b, affording polyesters with controlled molecular weights at low monomer to initiator ratios (Mn up to 15,000 g mol-1), relatively high polydispersities (Ð~1.8) and high number-average functionalities (Fn up to 85%).
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Affiliation(s)
- Kirill V. Zaitsev
- Department of Chemistry, Moscow State University, Leninskye Gory 1, 3, Moscow 119991, Russia
- Correspondence: (K.V.Z.); (I.V.V.); (S.V.K.)
| | - Andrey D. Trubachev
- Department of Chemistry, Moscow State University, Leninskye Gory 1, 3, Moscow 119991, Russia
| | - Yuri F. Oprunenko
- Department of Chemistry, Moscow State University, Leninskye Gory 1, 3, Moscow 119991, Russia
| | - Yuliya A. Piskun
- Research Institute for Physical Chemical Problems of the Belarusian State University, Leningradskaya Str., 14, 220006 Minsk, Belarus
| | - Irina V. Vasilenko
- Research Institute for Physical Chemical Problems of the Belarusian State University, Leningradskaya Str., 14, 220006 Minsk, Belarus
- Faculty of Chemistry, Belarusian State University, Leningradskaya Str., 14, 220006 Minsk, Belarus
- Correspondence: (K.V.Z.); (I.V.V.); (S.V.K.)
| | - Andrei V. Churakov
- N.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii Pr., 31, Moscow 119991, Russia
| | - Sergei V. Kostjuk
- Research Institute for Physical Chemical Problems of the Belarusian State University, Leningradskaya Str., 14, 220006 Minsk, Belarus
- Faculty of Chemistry, Belarusian State University, Leningradskaya Str., 14, 220006 Minsk, Belarus
- Institute for Regenerative Medicine, Sechenov First Moscow State Medical University, 8-2, Trubetskaya Str., Moscow 119992, Russia
- Correspondence: (K.V.Z.); (I.V.V.); (S.V.K.)
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Leon F, Li C, Reynes JF, Singh VK, Lian X, Ong HC, Hum G, Sun H, García F. Mechanosynthesis and photophysics of colour-tunable photoluminescent group 13 metal complexes with sterically demanding salen and salophen ligands. Faraday Discuss 2023; 241:63-78. [PMID: 36218327 DOI: 10.1039/d2fd00117a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
A series of four photoluminescent Al and In complexes were synthesised using an environmentally-benign mechanosynthesis strategy. Sterically crowded 3,5-di-tert-butyl functionalised salophen and salen ligands and their respective complexes have been synthesised in the solid-state and fully characterised. Subsequent photophysics and electrochemistry studies of the resulting complexes suggest that these new group 13 complexes can be viable alternatives to traditional photoluminescent complexes based on expensive and low abundant noble metals. The herein-reported strategy avoids the use of organic solvents and provides a process with low environmental impact and enhanced energy efficiency.
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Affiliation(s)
- Felix Leon
- School of Physical and Mathematical Sciences, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore
| | - Chenfei Li
- School of Physical and Mathematical Sciences, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore
| | - Javier F Reynes
- Departamento de Química Orgánica e Inorgánica, Facultad de Química, Universidad de Oviedo, Julián Claveria 8, Oviedo 33006, Asturias, Spain.
| | - Varun K Singh
- School of Physical and Mathematical Sciences, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore
| | - Xiao Lian
- School of Physical and Mathematical Sciences, Division of Physics and Applied Physics, Nanyang Technological University, 21 Nanyang Link, Singapore
| | - How Chee Ong
- School of Physical and Mathematical Sciences, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore
| | - Gavin Hum
- School of Physical and Mathematical Sciences, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore
| | - Handong Sun
- School of Physical and Mathematical Sciences, Division of Physics and Applied Physics, Nanyang Technological University, 21 Nanyang Link, Singapore
| | - Felipe García
- Departamento de Química Orgánica e Inorgánica, Facultad de Química, Universidad de Oviedo, Julián Claveria 8, Oviedo 33006, Asturias, Spain.
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7
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Huang Y, Li WD, Wei YX, Wang L, Dong WK. Structural, theoretical and optical investigations of two lateral twisting trinuclear Co(II) and Ni(II) salamo type complexes. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2022.134194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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8
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Unprecedented bi- and trinuclear palladium(II)-sodium complexes from a salophen-type Schiff base: Synthesis, characterization, thermal behavior, and in vitro biological activities. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2022.134224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Li SZ, Li WD, Yan YB, Zhang Y, Dong WK. Investigations of stable penta- and hexa-coordinate polynuclear Zn(II) and Cd(II) complexes derived from a single-armed salamo-based ligand. J COORD CHEM 2022. [DOI: 10.1080/00958972.2022.2159396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Shi-Zhen Li
- School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, PR China
| | - Wen-Da Li
- School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, PR China
| | - Yi-Bin Yan
- School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, PR China
| | - Yang Zhang
- School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, PR China
| | - Wen-Kui Dong
- School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, PR China
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10
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Zhang J, Feng LC, Li SZ, Dong WK. Studies on two phenoxo-bridged homopolynuclear Cu(II) bis(salamo) type complexes based on theoretical calculations and fluorescence properties. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.116113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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11
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Huang M, Ma X, Xu J, Pang H, Ning D, Yang J, Jiao L, Miao J, Wu Q. Synthesis and theoretical calculation of trinuclear copper Schiff-base complex: intermolecular interactions induced racemic pair. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.134681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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12
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Huang Y, Li X, Li WD, Dong WK. Experimental and theoretical investigation of a new non-symmetric salamo-like ligand and its tri-nuclear Zn(II) and Ni(II) complexes. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.121303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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13
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Stereoselective synthesis of biodegradable polymers by salen-type metal catalysts. Sci China Chem 2022. [DOI: 10.1007/s11426-022-1377-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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14
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Electronic Impacts on the Solvent-Free Mechanochemical Synthesis of Salophen Ligands in Ball Mill. J CHEM-NY 2022. [DOI: 10.1155/2022/1418032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
To realize the scope of the solid-solid reaction, the functional solid diamines reacted with solid 3-ethoxysalicylaldehyde under high-speed ball milling in a solvent-free environment. The findings showed that a wide range of Salophen ligands could be produced in good to excellent yields. In comparison to the similar Salophen synthesis to date, the current study provided solvent-free, fast reaction, high yield, and easy work-up.
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Li SZ, Wei YX, Huang Y, Dong WK. Counteranion-driven self-assembly of di- and tetra-nuclear Zn(II) single‐armed salamo‐type complexes. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133473] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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16
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Hsu CP, Liu CA, Wen CC, Liu YH, Lin YF, Chiu CW. Chiral Bis(oxazoline) Ligand‐Supported Alkyl Aluminum Cations. ChemCatChem 2022. [DOI: 10.1002/cctc.202101715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | | | | | - Ya-Fan Lin
- Kaohsiung Medical University Fragrance and Cosmetic Science TAIWAN
| | - Ching-Wen Chiu
- National Taiwan University Department of Chemistry No. 1, Sec. 4, Roosevelt Rd. 10617 Taipei TAIWAN
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Qian C, Yuan D, Wang Y, Yao Y. Aluminium complexes supported by a thioether-bridged salen ligand: synthesis, characterization and application in ε-caprolactone homopolymerization and copolymerization with L-lactide. J Organomet Chem 2021. [DOI: 10.1016/j.jorganchem.2021.122007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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18
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Metlushka KE, Sadkova DN, Nikitina KA, Zinnatullin RG, Yamaleeva ZR, Ivshin KA, Kiiamov AG, Kataeva ON. Chiral recognition of N-thiophosphorylated thioureas via nickel(ii) coordination assisted by 4-dimethylaminopyridine. Russ Chem Bull 2021. [DOI: 10.1007/s11172-021-3215-2] [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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Boruah JJ, Bhatt ZS, Nathani CR, Bambhaniya VJ, Guha AK, Das SP. Green synthesis of a vanadium(V) Schiff base complex by grinding method: study on its catalytic and anti-bacterial activity. J COORD CHEM 2021. [DOI: 10.1080/00958972.2021.1942861] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Jeena Jyoti Boruah
- Department of Chemistry, School of Science, RK University, Kasturbadham, Rajkot, Gujarat, India
- Department of Chemistry, Moridhal College, Dhemaji, Assam, India
| | - Zankhana S. Bhatt
- Department of Chemistry, School of Science, RK University, Kasturbadham, Rajkot, Gujarat, India
| | - Chirag R. Nathani
- Department of Chemistry, School of Science, RK University, Kasturbadham, Rajkot, Gujarat, India
| | - Vaishali J. Bambhaniya
- Department of Chemistry, School of Science, RK University, Kasturbadham, Rajkot, Gujarat, India
| | - Ankur Kanti Guha
- Advanced Computational Chemistry Centre, Department of Chemistry, Cotton University, Panbazar, Guwahati, Assam, India
| | - Siva Prased Das
- Department of Chemistry, School of Science, RK University, Kasturbadham, Rajkot, Gujarat, India
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Hsu CP, Liu YH, Boobalan R, Lin YF, Chein RJ, Chiu CW. Chiral Tetra-coordinate Aluminum Cation in Catalysis. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00036] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Ching-Pei Hsu
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
| | - Yi-Hung Liu
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
| | | | - Ya-Fan Lin
- Department of Fragrance and Cosmetic Science, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
| | - Rong-Jie Chein
- Institute of Chemistry, Academia Sinica, Taipei 11529, Taiwan
| | - Ching-Wen Chiu
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
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Gaston AJ, Greindl Z, Morrison CA, Garden JA. Cooperative Heterometallic Catalysts for Lactide Ring-Opening Polymerization: Combining Aluminum with Divalent Metals. Inorg Chem 2021; 60:2294-2303. [PMID: 33512999 DOI: 10.1021/acs.inorgchem.0c03145] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
While homometallic (salen)Al catalysts display excellent performance in lactide ring-opening polymerization (ROP), heterometallic (salen)Al complexes have yet to be reported. Herein, we describe four heterobimetallic (salen)Al catalysts and show that the choice of the heterometal is key. Cooperative Al/Mg and Al/Zn combinations improved the catalyst activity by a factor of up to 11 compared to the mono-Al analogue, whereas the mono-Mg and mono-Zn analogues were completely inactive. In contrast, Al/Li and Al/Ca heterocombinations stunted the polymerization rate. Kinetic and computational studies suggest that Al/Mg and Al/Zn cooperativity arises from the close intermetallic proximity facilitating chloride bridging (thus enhancing initiation), which promotes a rigid square pyramidal geometry around the Al center and further increases the available monomer coordination sites. This work also translates the use of ab initio molecular dynamics calculations to ROP, introducing a useful method of investigating catalyst flexibility and revealing that ligand strain and molecular rigidity can enhance heterometallic catalyst performance.
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Affiliation(s)
- Anand J Gaston
- EaStCHEM School of Chemistry, University of Edinburgh, Edinburgh EH9 3FJ, U.K
| | - Zoe Greindl
- EaStCHEM School of Chemistry, University of Edinburgh, Edinburgh EH9 3FJ, U.K
| | - Carole A Morrison
- EaStCHEM School of Chemistry, University of Edinburgh, Edinburgh EH9 3FJ, U.K
| | - Jennifer A Garden
- EaStCHEM School of Chemistry, University of Edinburgh, Edinburgh EH9 3FJ, U.K
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Fish H, Hart S, Lamb KJ, North M, Quek SCZ, Whitwood AC, Woods B, Wu X. Structural analysis of five-coordinate aluminium(salen) complexes and its relationship to their catalytic activity. Dalton Trans 2021; 50:587-598. [PMID: 33367409 DOI: 10.1039/d0dt03598j] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The crystal structure of [Al(tBu-salen)]2O·HCl shows major changes compared to that of [Al(tBu-salen)]2O. The additional proton is localized on the bridging oxygen atom, making the aluminium atoms more electron deficient. As a result, a water molecule coordinates to one of the aluminium atoms, which becomes six-coordinate. This pushes the salen ligand associated with the six-coordinate aluminium ion closer to the other salen ligand and results in the geometry around the five-coordinate aluminium atom becoming more trigonal bipyramidal. These results experimentally mirror the predications of DFT calculations on the interaction of [Al(tBu-salen)]2O and related complexes with carbon dioxide. Variable temperature NMR studies of protonated [Al(tBu-salen)]2O complexes revealed that the structures were dynamic and could be explained on the basis of an intramolecular rearrangement in which the non-salen substituent of a five-coordinate aluminium(tBu-salen) unit migrates from one face of a square based pyramidal structure to the other via the formation of structures with trigonal bipyramidal geometries. Protonated [Al(tBu-salen)]2O complexes were shown to have enhanced Lewis acidity relative to [Al(tBu-salen)]2O, coordinating to water, dioxane and 1,2-epoxyhexane. Coordinated epoxyhexane was activated towards ring-opening, to give various species which remained coordinated to the aluminium centers. The protonated [Al(tBu-salen)]2O complexes catalysed the synthesis of cyclic carbonates from epoxides and carbon dioxide both in the presence and absence of tetrabutylammonium bromide as a nucleophilic cocatalyst. The catalytic activity was principally determined by the nature of the nucleophilic species within the catalyst structure rather than by changes to the Lewis acidity of the metal centers.
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Affiliation(s)
- Heather Fish
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.
| | - Sam Hart
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.
| | - Katie J Lamb
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.
| | - Michael North
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.
| | - Sophie C Z Quek
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.
| | - Adrian C Whitwood
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.
| | - Barnaby Woods
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.
| | - Xiao Wu
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.
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23
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Jung HJ, Cho Y, Kim D, Mehrkhodavandi P. Cationic aluminum, gallium, and indium complexes in catalysis. Catal Sci Technol 2021. [DOI: 10.1039/d0cy01741h] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The introduction of cationic charge allows cationic group 13 complexes to be excellent Lewis acid catalysts. Cationic aluminum, gallium, and indium complexes in catalysis are comprehensively reviewed based on the reaction type.
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Affiliation(s)
- Hyuk-Joon Jung
- Department of Chemistry
- University of British Columbia
- Vancouver
- Canada
| | - Youngjung Cho
- Department of Chemistry
- University of British Columbia
- Vancouver
- Canada
| | - Diana Kim
- Department of Chemistry
- University of British Columbia
- Vancouver
- Canada
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24
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Yankin AN, Dmitriev MV. Nickel complexes as efficient catalysts in multicomponent synthesis of tetrahydropyridine derivatives. SYNTHETIC COMMUN 2020. [DOI: 10.1080/00397911.2020.1803357] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Andrei N. Yankin
- Department of Physics and Engineering, ITMO University, St. Petersburg, Russia
| | - Maksim V. Dmitriev
- Departament of Organic Chemistry, Perm State National Research University, Perm, Russia
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25
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Xu G, Mahmood Q, Lv C, Yang R, Zhou L, Wang Q. Asymmetric kinetic resolution polymerization. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213296] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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26
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Miroslaw B. Homo- and Hetero-Oligonuclear Complexes of Platinum Group Metals (PGM) Coordinated by Imine Schiff Base Ligands. Int J Mol Sci 2020; 21:E3493. [PMID: 32429112 PMCID: PMC7278988 DOI: 10.3390/ijms21103493] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 05/12/2020] [Accepted: 05/13/2020] [Indexed: 11/16/2022] Open
Abstract
Chemistry of Schiff base (SB) ligands began in 1864 due to the discovery made by Hugo Schiff (Schiff, H., Justus Liebigs Ann. der Chemie 1864, 131 (1), 118-119). However, there is still a vivid interest in coordination compounds based on imine ligands. The aim of this paper is to review the most recent concepts on construction of homo- and hetero-oligonuclear Schiff base coordination compounds narrowed down to the less frequently considered complexes of platinum group metals (PGM). The combination of SB and PGM in oligonuclear entities has several advantages over mononuclear or polynuclear species. Such complexes usually exhibit better electroluminescent, magnetic and/or catalytic properties than mononuclear ones due to intermetallic interactions and frequently have better solubility than polymers. Various construction strategies of oligodentate imine ligands for coordination of PGM are surveyed including simple imine ligands, non-innocent 1,2-diimines, chelating imine systems with additional N/O/S atoms, classic N2O2-compartmental Schiff bases and their modifications resulting in acyclic fused ligands, macrocycles such as calixsalens, metallohelical structures, nano-sized molecular wheels and hybrid materials incorporating mesoionic species. Co-crystallization and formation of metallophilic interactions to extend the mononuclear entities up to oligonuclear coordination species are also discussed.
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Affiliation(s)
- Barbara Miroslaw
- Department of General and Coordination Chemistry and Crystallography, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Sklodowska University in Lublin, Pl. Marii Curie-Sklodowskiej 3, 20-031 Lublin, Poland
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27
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Gualandi A, Marchini M, Mengozzi L, Kidanu HT, Franc A, Ceroni P, Cozzi PG. Aluminum(III) Salen Complexes as Active Photoredox Catalysts. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901086] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Andrea Gualandi
- Dipartimento di Chimica “G. Ciamician”; Alma Mater Studiorum - Università di Bologna; Via Selmi 2 40126 Bologna Italy
| | - Marianna Marchini
- Dipartimento di Chimica “G. Ciamician”; Alma Mater Studiorum - Università di Bologna; Via Selmi 2 40126 Bologna Italy
| | - Luca Mengozzi
- Dipartimento di Chimica “G. Ciamician”; Alma Mater Studiorum - Università di Bologna; Via Selmi 2 40126 Bologna Italy
| | - Hagos Tesfay Kidanu
- Dipartimento di Chimica “G. Ciamician”; Alma Mater Studiorum - Università di Bologna; Via Selmi 2 40126 Bologna Italy
| | - Antoine Franc
- Dipartimento di Chimica “G. Ciamician”; Alma Mater Studiorum - Università di Bologna; Via Selmi 2 40126 Bologna Italy
- École nationale supérieure de chimie de Paris; 11, rue Pierre et Marie Curie 75231 Paris Cedex 05 France
| | - Paola Ceroni
- Dipartimento di Chimica “G. Ciamician”; Alma Mater Studiorum - Università di Bologna; Via Selmi 2 40126 Bologna Italy
| | - Pier Giorgio Cozzi
- Dipartimento di Chimica “G. Ciamician”; Alma Mater Studiorum - Università di Bologna; Via Selmi 2 40126 Bologna Italy
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